Merge branch 'database_defaults' into development

15 files changed, 213 insertions, 138 deletions

diff --git a/CHANGELOG b/CHANGELOG
index 28e671f8..9b027e6d 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -9,6 +9,7 @@ Development version (next release)
 - Fixed a bug in the OpenCL kernels: now placing __kernel before __attribute__
 - Added an option (-warm_up) to do a warm-up run before timing in the performance clients
 - Improved performance significantly of rotated GEMV computations
+- Improved performance of unseen/un-tuned devices by a better default tuning parameter selection
 - Various minor fixes and enhancements
 - Added tuned parameters for various devices (see README)
 
diff --git a/scripts/database/database.py b/scripts/database/database.py
index e115d68c..6d370d99 100755
--- a/scripts/database/database.py
+++ b/scripts/database/database.py
@@ -98,7 +98,8 @@ def main(argv):
     database_best_results = bests.get_best_results(database)
 
     # Determines the defaults for other vendors and per vendor
-    database_defaults = defaults.calculate_defaults(database_best_results)
+    print("[database] Calculating the default values...")
+    database_defaults = defaults.calculate_defaults(database, cl_args.verbose)
     database_best_results = db.concatenate_database(database_best_results, database_defaults)
 
     # Outputs the database as a C++ database
diff --git a/scripts/database/database/bests.py b/scripts/database/database/bests.py
index edb81733..e6239258 100644
--- a/scripts/database/database/bests.py
+++ b/scripts/database/database/bests.py
@@ -18,3 +18,26 @@ def get_best_results(df):
         best_parameters = database_entry[database_entry["time"] == best_time].iloc[0]
         database_bests = database_bests.append(best_parameters, ignore_index=True)
     return database_bests
+
+
+def get_relative_bests(df, parameter_column_names, name, verbose=False):
+    """Retrieves the relative best execution time over different devices"""
+
+    # Computes the sum of the execution times over the different devices
+    def sum_performance(x):
+        x["group_performance"] = x["relative_performance"].sum()
+        return x
+    df = df.groupby(parameter_column_names).apply(sum_performance)
+
+    # Retrieves the entries with the highest performance
+    best_performance = df["group_performance"].max()
+    df_bests = df[df["group_performance"] == best_performance]
+
+    # Retrieves one example only (the parameters are the same anyway)
+    df_bests = df_bests.drop_duplicates(["group_performance"])
+
+    # Completed, report and return the results
+    if verbose:
+        print("[database] " + str(name) + " with performance " + str(best_performance) + " " + str(df_bests.shape))
+    assert len(df_bests) == 1
+    return df_bests
diff --git a/scripts/database/database/defaults.py b/scripts/database/database/defaults.py
index 357c3a3a..8a02c201 100644
--- a/scripts/database/database/defaults.py
+++ b/scripts/database/database/defaults.py
@@ -6,7 +6,9 @@
 #   Cedric Nugteren <www.cedricnugteren.nl>
 
 import pandas as pd
+
 import clblast
+import bests
 
 
 def set_default_device(database_entry):
@@ -23,16 +25,18 @@ def set_default_time(database_entry):
     return database_entry
 
 
-def calculate_defaults(df):
-    """# Sets defaults for devices of the same type/vendor based on the smallest values of all known entries. The average
-    might be better for performance but some parameters might not be supported on other devices."""
+def calculate_defaults(database, verbose, calculate_common_best=True):
+    """Sets defaults for devices of the same type/vendor. An option determines how to compute the defaults."""
     database_defaults = pd.DataFrame()
 
     # Defaults per combination of device vendors and device types (e.g. AMD GPU)
-    database_type_vendor = df.groupby(clblast.DEVICE_TYPE_ATTRIBUTES + clblast.KERNEL_ATTRIBUTES + ["kernel"] +
-                                      clblast.ARGUMENT_ATTRIBUTES)
+    database_type_vendor = database.groupby(clblast.DEVICE_TYPE_ATTRIBUTES + clblast.KERNEL_ATTRIBUTES + ["kernel"] +
+                                            clblast.ARGUMENT_ATTRIBUTES)
     for group_name, database_group in database_type_vendor:
-        default_values = database_group.min(axis=0)
+        if calculate_common_best:
+            default_values = get_common_best(database_group, group_name, verbose)
+        else:
+            default_values = get_smallest_best(database_group)
         default_values = set_default_device(default_values)
         default_values = set_default_time(default_values)
         database_defaults = database_defaults.append(default_values, ignore_index=True)
@@ -45,9 +49,12 @@ def calculate_defaults(df):
             print("[WARNING] Entries for a single kernel with multiple argument values: " + description)
 
     # Defaults over all device types and vendors
-    groups = df.groupby(clblast.KERNEL_ATTRIBUTES + ["kernel"] + clblast.ARGUMENT_ATTRIBUTES)
+    groups = database.groupby(clblast.KERNEL_ATTRIBUTES + ["kernel"] + clblast.ARGUMENT_ATTRIBUTES)
     for group_name, database_group in groups:
-        default_values = database_group.min(axis=0)
+        if calculate_common_best:
+            default_values = get_common_best(database_group, group_name, verbose)
+        else:
+            default_values = get_smallest_best(database_group)
         default_values["device_vendor"] = clblast.VENDOR_DEFAULT
         default_values["device_type"] = clblast.DEVICE_TYPE_DEFAULT
         default_values = set_default_device(default_values)
@@ -56,3 +63,46 @@ def calculate_defaults(df):
 
     # Database with both types of defaults only
     return database_defaults
+
+
+def get_smallest_best(database):
+    """Sets defaults based on the smallest values of all known entries. The average might be better for performance but
+    some parameters might not be supported on other devices."""
+    database_best_results = bests.get_best_results(database)
+    return database_best_results.min(axis=0)
+
+
+def get_common_best(database, group_name, verbose):
+    """Sets defaults based on the best values of entries supported by all devices. This might cause a problem in case
+    not every device was tuned with the same parameters. In that case it falls back to the above method to retrieve
+    the smallest best execution time"""
+
+    # Counts the number of devices in this group
+    num_devices = len(database.groupby(clblast.DEVICE_ATTRIBUTES))
+
+    # Removes columns without any values
+    database = database.dropna(axis=1, how='all')
+    database = database.reset_index()
+
+    # Inserts the relative execution times into the database
+    def relative_performance(x):
+        x["relative_performance"] = x["time"].min() / x["time"]
+        return x
+    database = database.groupby(clblast.ATTRIBUTES + ["kernel"]).apply(relative_performance)
+
+    # Retrieves the parameter names for this kernel
+    all_column_names = list(database.columns.values)
+    parameter_column_names = [c for c in all_column_names if "parameters." in c]
+
+    # Removes entries which are not available for all devices
+    database_by_parameters = database.groupby(parameter_column_names)
+    database_common = database_by_parameters.filter(lambda x: len(x) == num_devices)
+
+    # Fall back to another method in case there are no shared entries at all across devices
+    if len(database_common) == 0:
+        if verbose:
+            print("[database] No common kernels for: " + str(group_name) + " with devices: %d " % num_devices)
+        return get_smallest_best(database)
+
+    # Retrieves the entries with the highest relative performance
+    return bests.get_relative_bests(database_common, parameter_column_names, group_name, verbose)
diff --git a/src/database/kernels/copy.hpp b/src/database/kernels/copy.hpp
index d592f110..0ea2b495 100644
--- a/src/database/kernels/copy.hpp
+++ b/src/database/kernels/copy.hpp
@@ -41,7 +41,7 @@ const Database::DatabaseEntry Database::CopySingle = {
         { "Oland",                                           { {"COPY_DIMX",32}, {"COPY_DIMY",8}, {"COPY_VW",4}, {"COPY_WPT",2} } },
         { "Pitcairn",                                        { {"COPY_DIMX",8}, {"COPY_DIMY",16}, {"COPY_VW",4}, {"COPY_WPT",1} } },
         { "Tahiti",                                          { {"COPY_DIMX",32}, {"COPY_DIMY",8}, {"COPY_VW",2}, {"COPY_WPT",2} } },
-        { "default",                                         { {"COPY_DIMX",8}, {"COPY_DIMY",8}, {"COPY_VW",2}, {"COPY_WPT",1} } },
+        { "default",                                         { {"COPY_DIMX",32}, {"COPY_DIMY",8}, {"COPY_VW",2}, {"COPY_WPT",2} } },
       }
     },
     { // ARM GPUs
@@ -65,7 +65,7 @@ const Database::DatabaseEntry Database::CopySingle = {
         { "Intel(R) HD Graphics Skylake ULT GT2",            { {"COPY_DIMX",32}, {"COPY_DIMY",8}, {"COPY_VW",2}, {"COPY_WPT",1} } },
         { "Iris",                                            { {"COPY_DIMX",16}, {"COPY_DIMY",8}, {"COPY_VW",1}, {"COPY_WPT",2} } },
         { "Iris Pro",                                        { {"COPY_DIMX",32}, {"COPY_DIMY",8}, {"COPY_VW",4}, {"COPY_WPT",4} } },
-        { "default",                                         { {"COPY_DIMX",8}, {"COPY_DIMY",8}, {"COPY_VW",1}, {"COPY_WPT",1} } },
+        { "default",                                         { {"COPY_DIMX",8}, {"COPY_DIMY",8}, {"COPY_VW",2}, {"COPY_WPT",1} } },
       }
     },
     { // Intel accelerators
@@ -88,12 +88,12 @@ const Database::DatabaseEntry Database::CopySingle = {
         { "GeForce GTX TITAN X",                             { {"COPY_DIMX",32}, {"COPY_DIMY",8}, {"COPY_VW",2}, {"COPY_WPT",1} } },
         { "Tesla K20m",                                      { {"COPY_DIMX",8}, {"COPY_DIMY",8}, {"COPY_VW",4}, {"COPY_WPT",4} } },
         { "Tesla K40m",                                      { {"COPY_DIMX",8}, {"COPY_DIMY",8}, {"COPY_VW",4}, {"COPY_WPT",2} } },
-        { "default",                                         { {"COPY_DIMX",8}, {"COPY_DIMY",8}, {"COPY_VW",1}, {"COPY_WPT",1} } },
+        { "default",                                         { {"COPY_DIMX",8}, {"COPY_DIMY",16}, {"COPY_VW",4}, {"COPY_WPT",1} } },
       }
     },
     { // Default
       kDeviceTypeAll, "default", {
-        { "default",                                         { {"COPY_DIMX",8}, {"COPY_DIMY",8}, {"COPY_VW",1}, {"COPY_WPT",1} } },
+        { "default",                                         { {"COPY_DIMX",32}, {"COPY_DIMY",8}, {"COPY_VW",2}, {"COPY_WPT",2} } },
       }
     },
   }
@@ -110,7 +110,7 @@ const Database::DatabaseEntry Database::CopyComplexSingle = {
         { "Oland",                                           { {"COPY_DIMX",8}, {"COPY_DIMY",16}, {"COPY_VW",1}, {"COPY_WPT",1} } },
         { "Pitcairn",                                        { {"COPY_DIMX",8}, {"COPY_DIMY",8}, {"COPY_VW",1}, {"COPY_WPT",2} } },
         { "Tahiti",                                          { {"COPY_DIMX",8}, {"COPY_DIMY",8}, {"COPY_VW",2}, {"COPY_WPT",2} } },
-        { "default",                                         { {"COPY_DIMX",8}, {"COPY_DIMY",8}, {"COPY_VW",1}, {"COPY_WPT",1} } },
+        { "default",                                         { {"COPY_DIMX",32}, {"COPY_DIMY",8}, {"COPY_VW",1}, {"COPY_WPT",1} } },
       }
     },
     { // Intel CPUs
@@ -118,7 +118,7 @@ const Database::DatabaseEntry Database::CopyComplexSingle = {
         { "Intel(R) Core(TM) i5-6200U CPU @ 2.30GHz",        { {"COPY_DIMX",16}, {"COPY_DIMY",16}, {"COPY_VW",8}, {"COPY_WPT",1} } },
         { "Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz",         { {"COPY_DIMX",32}, {"COPY_DIMY",8}, {"COPY_VW",2}, {"COPY_WPT",2} } },
         { "Intel(R) Core(TM) i7-5930K CPU @ 3.50GHz",        { {"COPY_DIMX",16}, {"COPY_DIMY",8}, {"COPY_VW",8}, {"COPY_WPT",1} } },
-        { "default",                                         { {"COPY_DIMX",16}, {"COPY_DIMY",8}, {"COPY_VW",2}, {"COPY_WPT",1} } },
+        { "default",                                         { {"COPY_DIMX",32}, {"COPY_DIMY",8}, {"COPY_VW",8}, {"COPY_WPT",1} } },
       }
     },
     { // Intel GPUs
@@ -149,12 +149,12 @@ const Database::DatabaseEntry Database::CopyComplexSingle = {
         { "GeForce GTX TITAN X",                             { {"COPY_DIMX",16}, {"COPY_DIMY",8}, {"COPY_VW",1}, {"COPY_WPT",1} } },
         { "Tesla K20m",                                      { {"COPY_DIMX",8}, {"COPY_DIMY",8}, {"COPY_VW",1}, {"COPY_WPT",4} } },
         { "Tesla K40m",                                      { {"COPY_DIMX",16}, {"COPY_DIMY",8}, {"COPY_VW",1}, {"COPY_WPT",1} } },
-        { "default",                                         { {"COPY_DIMX",8}, {"COPY_DIMY",8}, {"COPY_VW",1}, {"COPY_WPT",1} } },
+        { "default",                                         { {"COPY_DIMX",16}, {"COPY_DIMY",8}, {"COPY_VW",1}, {"COPY_WPT",1} } },
       }
     },
     { // Default
       kDeviceTypeAll, "default", {
-        { "default",                                         { {"COPY_DIMX",8}, {"COPY_DIMY",8}, {"COPY_VW",1}, {"COPY_WPT",1} } },
+        { "default",                                         { {"COPY_DIMX",32}, {"COPY_DIMY",8}, {"COPY_VW",1}, {"COPY_WPT",1} } },
       }
     },
   }
@@ -171,7 +171,7 @@ const Database::DatabaseEntry Database::CopyDouble = {
         { "Oland",                                           { {"COPY_DIMX",32}, {"COPY_DIMY",8}, {"COPY_VW",2}, {"COPY_WPT",8} } },
         { "Pitcairn",                                        { {"COPY_DIMX",32}, {"COPY_DIMY",8}, {"COPY_VW",1}, {"COPY_WPT",1} } },
         { "Tahiti",                                          { {"COPY_DIMX",8}, {"COPY_DIMY",32}, {"COPY_VW",2}, {"COPY_WPT",1} } },
-        { "default",                                         { {"COPY_DIMX",8}, {"COPY_DIMY",8}, {"COPY_VW",1}, {"COPY_WPT",1} } },
+        { "default",                                         { {"COPY_DIMX",32}, {"COPY_DIMY",8}, {"COPY_VW",1}, {"COPY_WPT",2} } },
       }
     },
     { // ARM GPUs
@@ -185,7 +185,7 @@ const Database::DatabaseEntry Database::CopyDouble = {
         { "Intel(R) Core(TM) i5-6200U CPU @ 2.30GHz",        { {"COPY_DIMX",16}, {"COPY_DIMY",8}, {"COPY_VW",8}, {"COPY_WPT",1} } },
         { "Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz",         { {"COPY_DIMX",16}, {"COPY_DIMY",32}, {"COPY_VW",2}, {"COPY_WPT",1} } },
         { "Intel(R) Core(TM) i7-5930K CPU @ 3.50GHz",        { {"COPY_DIMX",16}, {"COPY_DIMY",16}, {"COPY_VW",8}, {"COPY_WPT",1} } },
-        { "default",                                         { {"COPY_DIMX",16}, {"COPY_DIMY",8}, {"COPY_VW",2}, {"COPY_WPT",1} } },
+        { "default",                                         { {"COPY_DIMX",16}, {"COPY_DIMY",16}, {"COPY_VW",8}, {"COPY_WPT",1} } },
       }
     },
     { // Intel accelerators
@@ -208,12 +208,12 @@ const Database::DatabaseEntry Database::CopyDouble = {
         { "GeForce GTX TITAN X",                             { {"COPY_DIMX",32}, {"COPY_DIMY",16}, {"COPY_VW",1}, {"COPY_WPT",1} } },
         { "Tesla K20m",                                      { {"COPY_DIMX",8}, {"COPY_DIMY",8}, {"COPY_VW",2}, {"COPY_WPT",1} } },
         { "Tesla K40m",                                      { {"COPY_DIMX",8}, {"COPY_DIMY",8}, {"COPY_VW",2}, {"COPY_WPT",2} } },
-        { "default",                                         { {"COPY_DIMX",8}, {"COPY_DIMY",8}, {"COPY_VW",1}, {"COPY_WPT",1} } },
+        { "default",                                         { {"COPY_DIMX",32}, {"COPY_DIMY",32}, {"COPY_VW",2}, {"COPY_WPT",1} } },
       }
     },
     { // Default
       kDeviceTypeAll, "default", {
-        { "default",                                         { {"COPY_DIMX",8}, {"COPY_DIMY",8}, {"COPY_VW",1}, {"COPY_WPT",1} } },
+        { "default",                                         { {"COPY_DIMX",16}, {"COPY_DIMY",8}, {"COPY_VW",2}, {"COPY_WPT",1} } },
       }
     },
   }
@@ -230,7 +230,7 @@ const Database::DatabaseEntry Database::CopyComplexDouble = {
         { "Oland",                                           { {"COPY_DIMX",8}, {"COPY_DIMY",16}, {"COPY_VW",1}, {"COPY_WPT",1} } },
         { "Pitcairn",                                        { {"COPY_DIMX",16}, {"COPY_DIMY",8}, {"COPY_VW",1}, {"COPY_WPT",1} } },
         { "Tahiti",                                          { {"COPY_DIMX",8}, {"COPY_DIMY",16}, {"COPY_VW",1}, {"COPY_WPT",1} } },
-        { "default",                                         { {"COPY_DIMX",8}, {"COPY_DIMY",8}, {"COPY_VW",1}, {"COPY_WPT",1} } },
+        { "default",                                         { {"COPY_DIMX",8}, {"COPY_DIMY",16}, {"COPY_VW",1}, {"COPY_WPT",1} } },
       }
     },
     { // ARM GPUs
@@ -244,7 +244,7 @@ const Database::DatabaseEntry Database::CopyComplexDouble = {
         { "Intel(R) Core(TM) i5-6200U CPU @ 2.30GHz",        { {"COPY_DIMX",32}, {"COPY_DIMY",8}, {"COPY_VW",8}, {"COPY_WPT",1} } },
         { "Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz",         { {"COPY_DIMX",32}, {"COPY_DIMY",32}, {"COPY_VW",8}, {"COPY_WPT",1} } },
         { "Intel(R) Core(TM) i7-5930K CPU @ 3.50GHz",        { {"COPY_DIMX",8}, {"COPY_DIMY",8}, {"COPY_VW",8}, {"COPY_WPT",1} } },
-        { "default",                                         { {"COPY_DIMX",8}, {"COPY_DIMY",8}, {"COPY_VW",8}, {"COPY_WPT",1} } },
+        { "default",                                         { {"COPY_DIMX",32}, {"COPY_DIMY",32}, {"COPY_VW",8}, {"COPY_WPT",1} } },
       }
     },
     { // Intel accelerators
@@ -272,7 +272,7 @@ const Database::DatabaseEntry Database::CopyComplexDouble = {
     },
     { // Default
       kDeviceTypeAll, "default", {
-        { "default",                                         { {"COPY_DIMX",8}, {"COPY_DIMY",8}, {"COPY_VW",1}, {"COPY_WPT",1} } },
+        { "default",                                         { {"COPY_DIMX",16}, {"COPY_DIMY",8}, {"COPY_VW",1}, {"COPY_WPT",1} } },
       }
     },
   }
diff --git a/src/database/kernels/pad.hpp b/src/database/kernels/pad.hpp
index cd034f15..d1643447 100644
--- a/src/database/kernels/pad.hpp
+++ b/src/database/kernels/pad.hpp
@@ -41,7 +41,7 @@ const Database::DatabaseEntry Database::PadSingle = {
         { "Oland",                                           { {"PAD_DIMX",8}, {"PAD_DIMY",8}, {"PAD_WPTX",1}, {"PAD_WPTY",2} } },
         { "Pitcairn",                                        { {"PAD_DIMX",32}, {"PAD_DIMY",8}, {"PAD_WPTX",1}, {"PAD_WPTY",2} } },
         { "Tahiti",                                          { {"PAD_DIMX",32}, {"PAD_DIMY",8}, {"PAD_WPTX",1}, {"PAD_WPTY",2} } },
-        { "default",                                         { {"PAD_DIMX",8}, {"PAD_DIMY",8}, {"PAD_WPTX",1}, {"PAD_WPTY",1} } },
+        { "default",                                         { {"PAD_DIMX",8}, {"PAD_DIMY",8}, {"PAD_WPTX",1}, {"PAD_WPTY",2} } },
       }
     },
     { // ARM GPUs
@@ -55,7 +55,7 @@ const Database::DatabaseEntry Database::PadSingle = {
         { "Intel(R) Core(TM) i5-6200U CPU @ 2.30GHz",        { {"PAD_DIMX",32}, {"PAD_DIMY",16}, {"PAD_WPTX",4}, {"PAD_WPTY",1} } },
         { "Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz",         { {"PAD_DIMX",16}, {"PAD_DIMY",32}, {"PAD_WPTX",4}, {"PAD_WPTY",4} } },
         { "Intel(R) Core(TM) i7-5930K CPU @ 3.50GHz",        { {"PAD_DIMX",32}, {"PAD_DIMY",8}, {"PAD_WPTX",4}, {"PAD_WPTY",1} } },
-        { "default",                                         { {"PAD_DIMX",16}, {"PAD_DIMY",8}, {"PAD_WPTX",4}, {"PAD_WPTY",1} } },
+        { "default",                                         { {"PAD_DIMX",32}, {"PAD_DIMY",8}, {"PAD_WPTX",4}, {"PAD_WPTY",2} } },
       }
     },
     { // Intel GPUs
@@ -65,7 +65,7 @@ const Database::DatabaseEntry Database::PadSingle = {
         { "Intel(R) HD Graphics Skylake ULT GT2",            { {"PAD_DIMX",16}, {"PAD_DIMY",8}, {"PAD_WPTX",2}, {"PAD_WPTY",1} } },
         { "Iris",                                            { {"PAD_DIMX",32}, {"PAD_DIMY",16}, {"PAD_WPTX",2}, {"PAD_WPTY",1} } },
         { "Iris Pro",                                        { {"PAD_DIMX",16}, {"PAD_DIMY",8}, {"PAD_WPTX",2}, {"PAD_WPTY",1} } },
-        { "default",                                         { {"PAD_DIMX",8}, {"PAD_DIMY",8}, {"PAD_WPTX",1}, {"PAD_WPTY",1} } },
+        { "default",                                         { {"PAD_DIMX",16}, {"PAD_DIMY",8}, {"PAD_WPTX",2}, {"PAD_WPTY",2} } },
       }
     },
     { // Intel accelerators
@@ -88,12 +88,12 @@ const Database::DatabaseEntry Database::PadSingle = {
         { "GeForce GTX TITAN X",                             { {"PAD_DIMX",16}, {"PAD_DIMY",16}, {"PAD_WPTX",1}, {"PAD_WPTY",1} } },
         { "Tesla K20m",                                      { {"PAD_DIMX",32}, {"PAD_DIMY",8}, {"PAD_WPTX",2}, {"PAD_WPTY",1} } },
         { "Tesla K40m",                                      { {"PAD_DIMX",32}, {"PAD_DIMY",8}, {"PAD_WPTX",1}, {"PAD_WPTY",1} } },
-        { "default",                                         { {"PAD_DIMX",16}, {"PAD_DIMY",8}, {"PAD_WPTX",1}, {"PAD_WPTY",1} } },
+        { "default",                                         { {"PAD_DIMX",32}, {"PAD_DIMY",8}, {"PAD_WPTX",4}, {"PAD_WPTY",1} } },
       }
     },
     { // Default
       kDeviceTypeAll, "default", {
-        { "default",                                         { {"PAD_DIMX",8}, {"PAD_DIMY",8}, {"PAD_WPTX",1}, {"PAD_WPTY",1} } },
+        { "default",                                         { {"PAD_DIMX",32}, {"PAD_DIMY",8}, {"PAD_WPTX",1}, {"PAD_WPTY",2} } },
       }
     },
   }
@@ -110,7 +110,7 @@ const Database::DatabaseEntry Database::PadComplexSingle = {
         { "Oland",                                           { {"PAD_DIMX",8}, {"PAD_DIMY",32}, {"PAD_WPTX",1}, {"PAD_WPTY",1} } },
         { "Pitcairn",                                        { {"PAD_DIMX",8}, {"PAD_DIMY",8}, {"PAD_WPTX",1}, {"PAD_WPTY",2} } },
         { "Tahiti",                                          { {"PAD_DIMX",16}, {"PAD_DIMY",16}, {"PAD_WPTX",1}, {"PAD_WPTY",1} } },
-        { "default",                                         { {"PAD_DIMX",8}, {"PAD_DIMY",8}, {"PAD_WPTX",1}, {"PAD_WPTY",1} } },
+        { "default",                                         { {"PAD_DIMX",32}, {"PAD_DIMY",8}, {"PAD_WPTX",1}, {"PAD_WPTY",1} } },
       }
     },
     { // ARM GPUs
@@ -124,7 +124,7 @@ const Database::DatabaseEntry Database::PadComplexSingle = {
         { "Intel(R) Core(TM) i5-6200U CPU @ 2.30GHz",        { {"PAD_DIMX",32}, {"PAD_DIMY",8}, {"PAD_WPTX",2}, {"PAD_WPTY",2} } },
         { "Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz",         { {"PAD_DIMX",32}, {"PAD_DIMY",32}, {"PAD_WPTX",4}, {"PAD_WPTY",1} } },
         { "Intel(R) Core(TM) i7-5930K CPU @ 3.50GHz",        { {"PAD_DIMX",32}, {"PAD_DIMY",16}, {"PAD_WPTX",4}, {"PAD_WPTY",1} } },
-        { "default",                                         { {"PAD_DIMX",32}, {"PAD_DIMY",8}, {"PAD_WPTX",2}, {"PAD_WPTY",1} } },
+        { "default",                                         { {"PAD_DIMX",32}, {"PAD_DIMY",16}, {"PAD_WPTX",4}, {"PAD_WPTY",1} } },
       }
     },
     { // Intel GPUs
@@ -134,7 +134,7 @@ const Database::DatabaseEntry Database::PadComplexSingle = {
         { "Intel(R) HD Graphics Skylake ULT GT2",            { {"PAD_DIMX",32}, {"PAD_DIMY",8}, {"PAD_WPTX",2}, {"PAD_WPTY",4} } },
         { "Iris",                                            { {"PAD_DIMX",32}, {"PAD_DIMY",16}, {"PAD_WPTX",2}, {"PAD_WPTY",4} } },
         { "Iris Pro",                                        { {"PAD_DIMX",32}, {"PAD_DIMY",8}, {"PAD_WPTX",2}, {"PAD_WPTY",1} } },
-        { "default",                                         { {"PAD_DIMX",8}, {"PAD_DIMY",8}, {"PAD_WPTX",1}, {"PAD_WPTY",1} } },
+        { "default",                                         { {"PAD_DIMX",32}, {"PAD_DIMY",8}, {"PAD_WPTX",1}, {"PAD_WPTY",4} } },
       }
     },
     { // Intel accelerators
@@ -157,12 +157,12 @@ const Database::DatabaseEntry Database::PadComplexSingle = {
         { "GeForce GTX TITAN X",                             { {"PAD_DIMX",16}, {"PAD_DIMY",8}, {"PAD_WPTX",1}, {"PAD_WPTY",1} } },
         { "Tesla K20m",                                      { {"PAD_DIMX",32}, {"PAD_DIMY",8}, {"PAD_WPTX",1}, {"PAD_WPTY",2} } },
         { "Tesla K40m",                                      { {"PAD_DIMX",16}, {"PAD_DIMY",8}, {"PAD_WPTX",1}, {"PAD_WPTY",1} } },
-        { "default",                                         { {"PAD_DIMX",8}, {"PAD_DIMY",8}, {"PAD_WPTX",1}, {"PAD_WPTY",1} } },
+        { "default",                                         { {"PAD_DIMX",16}, {"PAD_DIMY",8}, {"PAD_WPTX",2}, {"PAD_WPTY",1} } },
       }
     },
     { // Default
       kDeviceTypeAll, "default", {
-        { "default",                                         { {"PAD_DIMX",8}, {"PAD_DIMY",8}, {"PAD_WPTX",1}, {"PAD_WPTY",1} } },
+        { "default",                                         { {"PAD_DIMX",32}, {"PAD_DIMY",8}, {"PAD_WPTX",1}, {"PAD_WPTY",1} } },
       }
     },
   }
@@ -179,7 +179,7 @@ const Database::DatabaseEntry Database::PadDouble = {
         { "Oland",                                           { {"PAD_DIMX",8}, {"PAD_DIMY",32}, {"PAD_WPTX",1}, {"PAD_WPTY",1} } },
         { "Pitcairn",                                        { {"PAD_DIMX",8}, {"PAD_DIMY",8}, {"PAD_WPTX",1}, {"PAD_WPTY",2} } },
         { "Tahiti",                                          { {"PAD_DIMX",32}, {"PAD_DIMY",8}, {"PAD_WPTX",1}, {"PAD_WPTY",1} } },
-        { "default",                                         { {"PAD_DIMX",8}, {"PAD_DIMY",8}, {"PAD_WPTX",1}, {"PAD_WPTY",1} } },
+        { "default",                                         { {"PAD_DIMX",32}, {"PAD_DIMY",8}, {"PAD_WPTX",1}, {"PAD_WPTY",2} } },
       }
     },
     { // ARM GPUs
@@ -193,7 +193,7 @@ const Database::DatabaseEntry Database::PadDouble = {
         { "Intel(R) Core(TM) i5-6200U CPU @ 2.30GHz",        { {"PAD_DIMX",32}, {"PAD_DIMY",8}, {"PAD_WPTX",4}, {"PAD_WPTY",1} } },
         { "Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz",         { {"PAD_DIMX",32}, {"PAD_DIMY",32}, {"PAD_WPTX",4}, {"PAD_WPTY",1} } },
         { "Intel(R) Core(TM) i7-5930K CPU @ 3.50GHz",        { {"PAD_DIMX",32}, {"PAD_DIMY",8}, {"PAD_WPTX",2}, {"PAD_WPTY",1} } },
-        { "default",                                         { {"PAD_DIMX",32}, {"PAD_DIMY",8}, {"PAD_WPTX",2}, {"PAD_WPTY",1} } },
+        { "default",                                         { {"PAD_DIMX",32}, {"PAD_DIMY",16}, {"PAD_WPTX",4}, {"PAD_WPTY",1} } },
       }
     },
     { // Intel accelerators
@@ -216,12 +216,12 @@ const Database::DatabaseEntry Database::PadDouble = {
         { "GeForce GTX TITAN X",                             { {"PAD_DIMX",16}, {"PAD_DIMY",8}, {"PAD_WPTX",1}, {"PAD_WPTY",1} } },
         { "Tesla K20m",                                      { {"PAD_DIMX",32}, {"PAD_DIMY",8}, {"PAD_WPTX",1}, {"PAD_WPTY",1} } },
         { "Tesla K40m",                                      { {"PAD_DIMX",16}, {"PAD_DIMY",8}, {"PAD_WPTX",1}, {"PAD_WPTY",2} } },
-        { "default",                                         { {"PAD_DIMX",8}, {"PAD_DIMY",8}, {"PAD_WPTX",1}, {"PAD_WPTY",1} } },
+        { "default",                                         { {"PAD_DIMX",32}, {"PAD_DIMY",8}, {"PAD_WPTX",1}, {"PAD_WPTY",1} } },
       }
     },
     { // Default
       kDeviceTypeAll, "default", {
-        { "default",                                         { {"PAD_DIMX",8}, {"PAD_DIMY",8}, {"PAD_WPTX",1}, {"PAD_WPTY",1} } },
+        { "default",                                         { {"PAD_DIMX",32}, {"PAD_DIMY",8}, {"PAD_WPTX",1}, {"PAD_WPTY",1} } },
       }
     },
   }
@@ -238,7 +238,7 @@ const Database::DatabaseEntry Database::PadComplexDouble = {
         { "Oland",                                           { {"PAD_DIMX",8}, {"PAD_DIMY",16}, {"PAD_WPTX",2}, {"PAD_WPTY",1} } },
         { "Pitcairn",                                        { {"PAD_DIMX",16}, {"PAD_DIMY",8}, {"PAD_WPTX",1}, {"PAD_WPTY",1} } },
         { "Tahiti",                                          { {"PAD_DIMX",8}, {"PAD_DIMY",16}, {"PAD_WPTX",1}, {"PAD_WPTY",1} } },
-        { "default",                                         { {"PAD_DIMX",8}, {"PAD_DIMY",8}, {"PAD_WPTX",1}, {"PAD_WPTY",1} } },
+        { "default",                                         { {"PAD_DIMX",32}, {"PAD_DIMY",8}, {"PAD_WPTX",1}, {"PAD_WPTY",1} } },
       }
     },
     { // ARM GPUs
@@ -252,7 +252,7 @@ const Database::DatabaseEntry Database::PadComplexDouble = {
         { "Intel(R) Core(TM) i5-6200U CPU @ 2.30GHz",        { {"PAD_DIMX",32}, {"PAD_DIMY",8}, {"PAD_WPTX",2}, {"PAD_WPTY",1} } },
         { "Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz",         { {"PAD_DIMX",16}, {"PAD_DIMY",32}, {"PAD_WPTX",4}, {"PAD_WPTY",1} } },
         { "Intel(R) Core(TM) i7-5930K CPU @ 3.50GHz",        { {"PAD_DIMX",32}, {"PAD_DIMY",8}, {"PAD_WPTX",2}, {"PAD_WPTY",1} } },
-        { "default",                                         { {"PAD_DIMX",16}, {"PAD_DIMY",8}, {"PAD_WPTX",2}, {"PAD_WPTY",1} } },
+        { "default",                                         { {"PAD_DIMX",32}, {"PAD_DIMY",16}, {"PAD_WPTX",4}, {"PAD_WPTY",1} } },
       }
     },
     { // Intel accelerators
@@ -275,12 +275,12 @@ const Database::DatabaseEntry Database::PadComplexDouble = {
         { "GeForce GTX TITAN X",                             { {"PAD_DIMX",16}, {"PAD_DIMY",8}, {"PAD_WPTX",1}, {"PAD_WPTY",1} } },
         { "Tesla K20m",                                      { {"PAD_DIMX",8}, {"PAD_DIMY",8}, {"PAD_WPTX",1}, {"PAD_WPTY",2} } },
         { "Tesla K40m",                                      { {"PAD_DIMX",8}, {"PAD_DIMY",8}, {"PAD_WPTX",1}, {"PAD_WPTY",1} } },
-        { "default",                                         { {"PAD_DIMX",8}, {"PAD_DIMY",8}, {"PAD_WPTX",1}, {"PAD_WPTY",1} } },
+        { "default",                                         { {"PAD_DIMX",16}, {"PAD_DIMY",8}, {"PAD_WPTX",1}, {"PAD_WPTY",1} } },
       }
     },
     { // Default
       kDeviceTypeAll, "default", {
-        { "default",                                         { {"PAD_DIMX",8}, {"PAD_DIMY",8}, {"PAD_WPTX",1}, {"PAD_WPTY",1} } },
+        { "default",                                         { {"PAD_DIMX",32}, {"PAD_DIMY",8}, {"PAD_WPTX",1}, {"PAD_WPTY",1} } },
       }
     },
   }
diff --git a/src/database/kernels/padtranspose.hpp b/src/database/kernels/padtranspose.hpp
index c2034c3e..bee66a4d 100644
--- a/src/database/kernels/padtranspose.hpp
+++ b/src/database/kernels/padtranspose.hpp
@@ -55,7 +55,7 @@ const Database::DatabaseEntry Database::PadtransposeSingle = {
         { "Intel(R) Core(TM) i5-6200U CPU @ 2.30GHz",        { {"PADTRA_PAD",0}, {"PADTRA_TILE",16}, {"PADTRA_WPT",1} } },
         { "Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz",         { {"PADTRA_PAD",0}, {"PADTRA_TILE",8}, {"PADTRA_WPT",8} } },
         { "Intel(R) Core(TM) i7-5930K CPU @ 3.50GHz",        { {"PADTRA_PAD",0}, {"PADTRA_TILE",32}, {"PADTRA_WPT",1} } },
-        { "default",                                         { {"PADTRA_PAD",0}, {"PADTRA_TILE",8}, {"PADTRA_WPT",1} } },
+        { "default",                                         { {"PADTRA_PAD",0}, {"PADTRA_TILE",8}, {"PADTRA_WPT",8} } },
       }
     },
     { // Intel GPUs
@@ -88,12 +88,12 @@ const Database::DatabaseEntry Database::PadtransposeSingle = {
         { "GeForce GTX TITAN X",                             { {"PADTRA_PAD",1}, {"PADTRA_TILE",32}, {"PADTRA_WPT",1} } },
         { "Tesla K20m",                                      { {"PADTRA_PAD",1}, {"PADTRA_TILE",16}, {"PADTRA_WPT",2} } },
         { "Tesla K40m",                                      { {"PADTRA_PAD",1}, {"PADTRA_TILE",32}, {"PADTRA_WPT",2} } },
-        { "default",                                         { {"PADTRA_PAD",0}, {"PADTRA_TILE",16}, {"PADTRA_WPT",1} } },
+        { "default",                                         { {"PADTRA_PAD",1}, {"PADTRA_TILE",32}, {"PADTRA_WPT",2} } },
       }
     },
     { // Default
       kDeviceTypeAll, "default", {
-        { "default",                                         { {"PADTRA_PAD",0}, {"PADTRA_TILE",8}, {"PADTRA_WPT",1} } },
+        { "default",                                         { {"PADTRA_PAD",1}, {"PADTRA_TILE",16}, {"PADTRA_WPT",2} } },
       }
     },
   }
@@ -110,7 +110,7 @@ const Database::DatabaseEntry Database::PadtransposeComplexSingle = {
         { "Oland",                                           { {"PADTRA_PAD",0}, {"PADTRA_TILE",8}, {"PADTRA_WPT",4} } },
         { "Pitcairn",                                        { {"PADTRA_PAD",0}, {"PADTRA_TILE",8}, {"PADTRA_WPT",4} } },
         { "Tahiti",                                          { {"PADTRA_PAD",0}, {"PADTRA_TILE",16}, {"PADTRA_WPT",2} } },
-        { "default",                                         { {"PADTRA_PAD",0}, {"PADTRA_TILE",8}, {"PADTRA_WPT",2} } },
+        { "default",                                         { {"PADTRA_PAD",0}, {"PADTRA_TILE",8}, {"PADTRA_WPT",4} } },
       }
     },
     { // ARM GPUs
@@ -134,7 +134,7 @@ const Database::DatabaseEntry Database::PadtransposeComplexSingle = {
         { "Intel(R) HD Graphics Skylake ULT GT2",            { {"PADTRA_PAD",0}, {"PADTRA_TILE",16}, {"PADTRA_WPT",4} } },
         { "Iris",                                            { {"PADTRA_PAD",0}, {"PADTRA_TILE",16}, {"PADTRA_WPT",2} } },
         { "Iris Pro",                                        { {"PADTRA_PAD",1}, {"PADTRA_TILE",16}, {"PADTRA_WPT",2} } },
-        { "default",                                         { {"PADTRA_PAD",0}, {"PADTRA_TILE",16}, {"PADTRA_WPT",2} } },
+        { "default",                                         { {"PADTRA_PAD",1}, {"PADTRA_TILE",16}, {"PADTRA_WPT",2} } },
       }
     },
     { // Intel accelerators
@@ -157,12 +157,12 @@ const Database::DatabaseEntry Database::PadtransposeComplexSingle = {
         { "GeForce GTX TITAN X",                             { {"PADTRA_PAD",1}, {"PADTRA_TILE",32}, {"PADTRA_WPT",1} } },
         { "Tesla K20m",                                      { {"PADTRA_PAD",0}, {"PADTRA_TILE",16}, {"PADTRA_WPT",1} } },
         { "Tesla K40m",                                      { {"PADTRA_PAD",1}, {"PADTRA_TILE",16}, {"PADTRA_WPT",1} } },
-        { "default",                                         { {"PADTRA_PAD",0}, {"PADTRA_TILE",16}, {"PADTRA_WPT",1} } },
+        { "default",                                         { {"PADTRA_PAD",1}, {"PADTRA_TILE",16}, {"PADTRA_WPT",1} } },
       }
     },
     { // Default
       kDeviceTypeAll, "default", {
-        { "default",                                         { {"PADTRA_PAD",0}, {"PADTRA_TILE",8}, {"PADTRA_WPT",1} } },
+        { "default",                                         { {"PADTRA_PAD",1}, {"PADTRA_TILE",16}, {"PADTRA_WPT",2} } },
       }
     },
   }
@@ -179,7 +179,7 @@ const Database::DatabaseEntry Database::PadtransposeDouble = {
         { "Oland",                                           { {"PADTRA_PAD",0}, {"PADTRA_TILE",16}, {"PADTRA_WPT",4} } },
         { "Pitcairn",                                        { {"PADTRA_PAD",0}, {"PADTRA_TILE",8}, {"PADTRA_WPT",4} } },
         { "Tahiti",                                          { {"PADTRA_PAD",1}, {"PADTRA_TILE",16}, {"PADTRA_WPT",2} } },
-        { "default",                                         { {"PADTRA_PAD",0}, {"PADTRA_TILE",8}, {"PADTRA_WPT",2} } },
+        { "default",                                         { {"PADTRA_PAD",0}, {"PADTRA_TILE",16}, {"PADTRA_WPT",4} } },
       }
     },
     { // ARM GPUs
@@ -193,7 +193,7 @@ const Database::DatabaseEntry Database::PadtransposeDouble = {
         { "Intel(R) Core(TM) i5-6200U CPU @ 2.30GHz",        { {"PADTRA_PAD",1}, {"PADTRA_TILE",8}, {"PADTRA_WPT",4} } },
         { "Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz",         { {"PADTRA_PAD",0}, {"PADTRA_TILE",8}, {"PADTRA_WPT",8} } },
         { "Intel(R) Core(TM) i7-5930K CPU @ 3.50GHz",        { {"PADTRA_PAD",1}, {"PADTRA_TILE",32}, {"PADTRA_WPT",1} } },
-        { "default",                                         { {"PADTRA_PAD",0}, {"PADTRA_TILE",8}, {"PADTRA_WPT",1} } },
+        { "default",                                         { {"PADTRA_PAD",1}, {"PADTRA_TILE",8}, {"PADTRA_WPT",4} } },
       }
     },
     { // Intel accelerators
@@ -216,12 +216,12 @@ const Database::DatabaseEntry Database::PadtransposeDouble = {
         { "GeForce GTX TITAN X",                             { {"PADTRA_PAD",1}, {"PADTRA_TILE",32}, {"PADTRA_WPT",1} } },
         { "Tesla K20m",                                      { {"PADTRA_PAD",0}, {"PADTRA_TILE",16}, {"PADTRA_WPT",1} } },
         { "Tesla K40m",                                      { {"PADTRA_PAD",1}, {"PADTRA_TILE",16}, {"PADTRA_WPT",1} } },
-        { "default",                                         { {"PADTRA_PAD",0}, {"PADTRA_TILE",16}, {"PADTRA_WPT",1} } },
+        { "default",                                         { {"PADTRA_PAD",1}, {"PADTRA_TILE",16}, {"PADTRA_WPT",1} } },
       }
     },
     { // Default
       kDeviceTypeAll, "default", {
-        { "default",                                         { {"PADTRA_PAD",0}, {"PADTRA_TILE",8}, {"PADTRA_WPT",1} } },
+        { "default",                                         { {"PADTRA_PAD",1}, {"PADTRA_TILE",16}, {"PADTRA_WPT",2} } },
       }
     },
   }
@@ -238,7 +238,7 @@ const Database::DatabaseEntry Database::PadtransposeComplexDouble = {
         { "Oland",                                           { {"PADTRA_PAD",0}, {"PADTRA_TILE",8}, {"PADTRA_WPT",4} } },
         { "Pitcairn",                                        { {"PADTRA_PAD",0}, {"PADTRA_TILE",8}, {"PADTRA_WPT",4} } },
         { "Tahiti",                                          { {"PADTRA_PAD",0}, {"PADTRA_TILE",8}, {"PADTRA_WPT",2} } },
-        { "default",                                         { {"PADTRA_PAD",0}, {"PADTRA_TILE",8}, {"PADTRA_WPT",2} } },
+        { "default",                                         { {"PADTRA_PAD",0}, {"PADTRA_TILE",8}, {"PADTRA_WPT",4} } },
       }
     },
     { // ARM GPUs
@@ -252,7 +252,7 @@ const Database::DatabaseEntry Database::PadtransposeComplexDouble = {
         { "Intel(R) Core(TM) i5-6200U CPU @ 2.30GHz",        { {"PADTRA_PAD",1}, {"PADTRA_TILE",8}, {"PADTRA_WPT",2} } },
         { "Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz",         { {"PADTRA_PAD",1}, {"PADTRA_TILE",8}, {"PADTRA_WPT",4} } },
         { "Intel(R) Core(TM) i7-5930K CPU @ 3.50GHz",        { {"PADTRA_PAD",1}, {"PADTRA_TILE",8}, {"PADTRA_WPT",4} } },
-        { "default",                                         { {"PADTRA_PAD",1}, {"PADTRA_TILE",8}, {"PADTRA_WPT",2} } },
+        { "default",                                         { {"PADTRA_PAD",1}, {"PADTRA_TILE",8}, {"PADTRA_WPT",4} } },
       }
     },
     { // Intel accelerators
@@ -275,12 +275,12 @@ const Database::DatabaseEntry Database::PadtransposeComplexDouble = {
         { "GeForce GTX TITAN X",                             { {"PADTRA_PAD",1}, {"PADTRA_TILE",32}, {"PADTRA_WPT",1} } },
         { "Tesla K20m",                                      { {"PADTRA_PAD",1}, {"PADTRA_TILE",16}, {"PADTRA_WPT",1} } },
         { "Tesla K40m",                                      { {"PADTRA_PAD",1}, {"PADTRA_TILE",16}, {"PADTRA_WPT",1} } },
-        { "default",                                         { {"PADTRA_PAD",0}, {"PADTRA_TILE",16}, {"PADTRA_WPT",1} } },
+        { "default",                                         { {"PADTRA_PAD",1}, {"PADTRA_TILE",16}, {"PADTRA_WPT",1} } },
       }
     },
     { // Default
       kDeviceTypeAll, "default", {
-        { "default",                                         { {"PADTRA_PAD",0}, {"PADTRA_TILE",8}, {"PADTRA_WPT",1} } },
+        { "default",                                         { {"PADTRA_PAD",0}, {"PADTRA_TILE",8}, {"PADTRA_WPT",2} } },
       }
     },
   }
diff --git a/src/database/kernels/transpose.hpp b/src/database/kernels/transpose.hpp
index 8e852c4b..bf8ac665 100644
--- a/src/database/kernels/transpose.hpp
+++ b/src/database/kernels/transpose.hpp
@@ -41,7 +41,7 @@ const Database::DatabaseEntry Database::TransposeSingle = {
         { "Oland",                                           { {"TRA_DIM",8}, {"TRA_PAD",0}, {"TRA_SHUFFLE",1}, {"TRA_WPT",4} } },
         { "Pitcairn",                                        { {"TRA_DIM",16}, {"TRA_PAD",0}, {"TRA_SHUFFLE",1}, {"TRA_WPT",1} } },
         { "Tahiti",                                          { {"TRA_DIM",4}, {"TRA_PAD",0}, {"TRA_SHUFFLE",1}, {"TRA_WPT",4} } },
-        { "default",                                         { {"TRA_DIM",4}, {"TRA_PAD",0}, {"TRA_SHUFFLE",1}, {"TRA_WPT",1} } },
+        { "default",                                         { {"TRA_DIM",4}, {"TRA_PAD",1}, {"TRA_SHUFFLE",1}, {"TRA_WPT",4} } },
       }
     },
     { // ARM GPUs
@@ -65,7 +65,7 @@ const Database::DatabaseEntry Database::TransposeSingle = {
         { "Intel(R) HD Graphics Skylake ULT GT2",            { {"TRA_DIM",8}, {"TRA_PAD",0}, {"TRA_SHUFFLE",1}, {"TRA_WPT",4} } },
         { "Iris",                                            { {"TRA_DIM",8}, {"TRA_PAD",1}, {"TRA_SHUFFLE",0}, {"TRA_WPT",4} } },
         { "Iris Pro",                                        { {"TRA_DIM",16}, {"TRA_PAD",1}, {"TRA_SHUFFLE",0}, {"TRA_WPT",4} } },
-        { "default",                                         { {"TRA_DIM",8}, {"TRA_PAD",0}, {"TRA_SHUFFLE",0}, {"TRA_WPT",4} } },
+        { "default",                                         { {"TRA_DIM",8}, {"TRA_PAD",1}, {"TRA_SHUFFLE",0}, {"TRA_WPT",4} } },
       }
     },
     { // Intel accelerators
@@ -88,12 +88,12 @@ const Database::DatabaseEntry Database::TransposeSingle = {
         { "GeForce GTX TITAN X",                             { {"TRA_DIM",16}, {"TRA_PAD",0}, {"TRA_SHUFFLE",0}, {"TRA_WPT",4} } },
         { "Tesla K20m",                                      { {"TRA_DIM",8}, {"TRA_PAD",0}, {"TRA_SHUFFLE",0}, {"TRA_WPT",4} } },
         { "Tesla K40m",                                      { {"TRA_DIM",8}, {"TRA_PAD",1}, {"TRA_SHUFFLE",0}, {"TRA_WPT",4} } },
-        { "default",                                         { {"TRA_DIM",4}, {"TRA_PAD",0}, {"TRA_SHUFFLE",0}, {"TRA_WPT",1} } },
+        { "default",                                         { {"TRA_DIM",8}, {"TRA_PAD",1}, {"TRA_SHUFFLE",0}, {"TRA_WPT",4} } },
       }
     },
     { // Default
       kDeviceTypeAll, "default", {
-        { "default",                                         { {"TRA_DIM",4}, {"TRA_PAD",0}, {"TRA_SHUFFLE",0}, {"TRA_WPT",1} } },
+        { "default",                                         { {"TRA_DIM",8}, {"TRA_PAD",0}, {"TRA_SHUFFLE",1}, {"TRA_WPT",4} } },
       }
     },
   }
@@ -110,7 +110,7 @@ const Database::DatabaseEntry Database::TransposeComplexSingle = {
         { "Oland",                                           { {"TRA_DIM",4}, {"TRA_PAD",0}, {"TRA_SHUFFLE",1}, {"TRA_WPT",2} } },
         { "Pitcairn",                                        { {"TRA_DIM",8}, {"TRA_PAD",0}, {"TRA_SHUFFLE",1}, {"TRA_WPT",1} } },
         { "Tahiti",                                          { {"TRA_DIM",16}, {"TRA_PAD",0}, {"TRA_SHUFFLE",1}, {"TRA_WPT",1} } },
-        { "default",                                         { {"TRA_DIM",4}, {"TRA_PAD",0}, {"TRA_SHUFFLE",1}, {"TRA_WPT",1} } },
+        { "default",                                         { {"TRA_DIM",4}, {"TRA_PAD",0}, {"TRA_SHUFFLE",1}, {"TRA_WPT",2} } },
       }
     },
     { // ARM GPUs
@@ -124,7 +124,7 @@ const Database::DatabaseEntry Database::TransposeComplexSingle = {
         { "Intel(R) Core(TM) i5-6200U CPU @ 2.30GHz",        { {"TRA_DIM",8}, {"TRA_PAD",0}, {"TRA_SHUFFLE",0}, {"TRA_WPT",2} } },
         { "Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz",         { {"TRA_DIM",4}, {"TRA_PAD",1}, {"TRA_SHUFFLE",0}, {"TRA_WPT",8} } },
         { "Intel(R) Core(TM) i7-5930K CPU @ 3.50GHz",        { {"TRA_DIM",16}, {"TRA_PAD",0}, {"TRA_SHUFFLE",0}, {"TRA_WPT",4} } },
-        { "default",                                         { {"TRA_DIM",4}, {"TRA_PAD",0}, {"TRA_SHUFFLE",0}, {"TRA_WPT",2} } },
+        { "default",                                         { {"TRA_DIM",4}, {"TRA_PAD",1}, {"TRA_SHUFFLE",0}, {"TRA_WPT",8} } },
       }
     },
     { // Intel GPUs
@@ -134,7 +134,7 @@ const Database::DatabaseEntry Database::TransposeComplexSingle = {
         { "Intel(R) HD Graphics Skylake ULT GT2",            { {"TRA_DIM",16}, {"TRA_PAD",1}, {"TRA_SHUFFLE",1}, {"TRA_WPT",2} } },
         { "Iris",                                            { {"TRA_DIM",8}, {"TRA_PAD",0}, {"TRA_SHUFFLE",0}, {"TRA_WPT",2} } },
         { "Iris Pro",                                        { {"TRA_DIM",16}, {"TRA_PAD",1}, {"TRA_SHUFFLE",0}, {"TRA_WPT",2} } },
-        { "default",                                         { {"TRA_DIM",8}, {"TRA_PAD",0}, {"TRA_SHUFFLE",0}, {"TRA_WPT",2} } },
+        { "default",                                         { {"TRA_DIM",16}, {"TRA_PAD",1}, {"TRA_SHUFFLE",0}, {"TRA_WPT",2} } },
       }
     },
     { // NVIDIA GPUs
@@ -151,12 +151,12 @@ const Database::DatabaseEntry Database::TransposeComplexSingle = {
         { "GeForce GTX TITAN X",                             { {"TRA_DIM",32}, {"TRA_PAD",1}, {"TRA_SHUFFLE",0}, {"TRA_WPT",1} } },
         { "Tesla K20m",                                      { {"TRA_DIM",16}, {"TRA_PAD",0}, {"TRA_SHUFFLE",0}, {"TRA_WPT",1} } },
         { "Tesla K40m",                                      { {"TRA_DIM",16}, {"TRA_PAD",1}, {"TRA_SHUFFLE",0}, {"TRA_WPT",1} } },
-        { "default",                                         { {"TRA_DIM",16}, {"TRA_PAD",0}, {"TRA_SHUFFLE",0}, {"TRA_WPT",1} } },
+        { "default",                                         { {"TRA_DIM",16}, {"TRA_PAD",1}, {"TRA_SHUFFLE",0}, {"TRA_WPT",1} } },
       }
     },
     { // Default
       kDeviceTypeAll, "default", {
-        { "default",                                         { {"TRA_DIM",4}, {"TRA_PAD",0}, {"TRA_SHUFFLE",0}, {"TRA_WPT",1} } },
+        { "default",                                         { {"TRA_DIM",16}, {"TRA_PAD",1}, {"TRA_SHUFFLE",0}, {"TRA_WPT",1} } },
       }
     },
   }
@@ -173,7 +173,7 @@ const Database::DatabaseEntry Database::TransposeDouble = {
         { "Oland",                                           { {"TRA_DIM",8}, {"TRA_PAD",1}, {"TRA_SHUFFLE",1}, {"TRA_WPT",2} } },
         { "Pitcairn",                                        { {"TRA_DIM",4}, {"TRA_PAD",0}, {"TRA_SHUFFLE",1}, {"TRA_WPT",2} } },
         { "Tahiti",                                          { {"TRA_DIM",4}, {"TRA_PAD",1}, {"TRA_SHUFFLE",1}, {"TRA_WPT",4} } },
-        { "default",                                         { {"TRA_DIM",4}, {"TRA_PAD",0}, {"TRA_SHUFFLE",1}, {"TRA_WPT",1} } },
+        { "default",                                         { {"TRA_DIM",4}, {"TRA_PAD",0}, {"TRA_SHUFFLE",1}, {"TRA_WPT",4} } },
       }
     },
     { // ARM GPUs
@@ -187,7 +187,7 @@ const Database::DatabaseEntry Database::TransposeDouble = {
         { "Intel(R) Core(TM) i5-6200U CPU @ 2.30GHz",        { {"TRA_DIM",4}, {"TRA_PAD",0}, {"TRA_SHUFFLE",0}, {"TRA_WPT",4} } },
         { "Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz",         { {"TRA_DIM",4}, {"TRA_PAD",1}, {"TRA_SHUFFLE",0}, {"TRA_WPT",8} } },
         { "Intel(R) Core(TM) i7-5930K CPU @ 3.50GHz",        { {"TRA_DIM",4}, {"TRA_PAD",0}, {"TRA_SHUFFLE",0}, {"TRA_WPT",8} } },
-        { "default",                                         { {"TRA_DIM",4}, {"TRA_PAD",0}, {"TRA_SHUFFLE",0}, {"TRA_WPT",4} } },
+        { "default",                                         { {"TRA_DIM",4}, {"TRA_PAD",0}, {"TRA_SHUFFLE",0}, {"TRA_WPT",8} } },
       }
     },
     { // Intel accelerators
@@ -210,12 +210,12 @@ const Database::DatabaseEntry Database::TransposeDouble = {
         { "GeForce GTX TITAN X",                             { {"TRA_DIM",32}, {"TRA_PAD",1}, {"TRA_SHUFFLE",0}, {"TRA_WPT",1} } },
         { "Tesla K20m",                                      { {"TRA_DIM",16}, {"TRA_PAD",1}, {"TRA_SHUFFLE",0}, {"TRA_WPT",2} } },
         { "Tesla K40m",                                      { {"TRA_DIM",16}, {"TRA_PAD",1}, {"TRA_SHUFFLE",1}, {"TRA_WPT",2} } },
-        { "default",                                         { {"TRA_DIM",8}, {"TRA_PAD",0}, {"TRA_SHUFFLE",0}, {"TRA_WPT",1} } },
+        { "default",                                         { {"TRA_DIM",16}, {"TRA_PAD",1}, {"TRA_SHUFFLE",1}, {"TRA_WPT",2} } },
       }
     },
     { // Default
       kDeviceTypeAll, "default", {
-        { "default",                                         { {"TRA_DIM",4}, {"TRA_PAD",0}, {"TRA_SHUFFLE",0}, {"TRA_WPT",1} } },
+        { "default",                                         { {"TRA_DIM",16}, {"TRA_PAD",1}, {"TRA_SHUFFLE",1}, {"TRA_WPT",2} } },
       }
     },
   }
@@ -232,7 +232,7 @@ const Database::DatabaseEntry Database::TransposeComplexDouble = {
         { "Oland",                                           { {"TRA_DIM",16}, {"TRA_PAD",0}, {"TRA_SHUFFLE",1}, {"TRA_WPT",1} } },
         { "Pitcairn",                                        { {"TRA_DIM",4}, {"TRA_PAD",0}, {"TRA_SHUFFLE",1}, {"TRA_WPT",1} } },
         { "Tahiti",                                          { {"TRA_DIM",16}, {"TRA_PAD",0}, {"TRA_SHUFFLE",1}, {"TRA_WPT",1} } },
-        { "default",                                         { {"TRA_DIM",4}, {"TRA_PAD",0}, {"TRA_SHUFFLE",1}, {"TRA_WPT",1} } },
+        { "default",                                         { {"TRA_DIM",8}, {"TRA_PAD",1}, {"TRA_SHUFFLE",1}, {"TRA_WPT",1} } },
       }
     },
     { // ARM GPUs
@@ -246,7 +246,7 @@ const Database::DatabaseEntry Database::TransposeComplexDouble = {
         { "Intel(R) Core(TM) i5-6200U CPU @ 2.30GHz",        { {"TRA_DIM",4}, {"TRA_PAD",0}, {"TRA_SHUFFLE",0}, {"TRA_WPT",4} } },
         { "Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz",         { {"TRA_DIM",4}, {"TRA_PAD",1}, {"TRA_SHUFFLE",0}, {"TRA_WPT",4} } },
         { "Intel(R) Core(TM) i7-5930K CPU @ 3.50GHz",        { {"TRA_DIM",16}, {"TRA_PAD",1}, {"TRA_SHUFFLE",0}, {"TRA_WPT",2} } },
-        { "default",                                         { {"TRA_DIM",4}, {"TRA_PAD",0}, {"TRA_SHUFFLE",0}, {"TRA_WPT",2} } },
+        { "default",                                         { {"TRA_DIM",4}, {"TRA_PAD",0}, {"TRA_SHUFFLE",0}, {"TRA_WPT",4} } },
       }
     },
     { // NVIDIA GPUs
@@ -263,12 +263,12 @@ const Database::DatabaseEntry Database::TransposeComplexDouble = {
         { "GeForce GTX TITAN X",                             { {"TRA_DIM",32}, {"TRA_PAD",1}, {"TRA_SHUFFLE",0}, {"TRA_WPT",1} } },
         { "Tesla K20m",                                      { {"TRA_DIM",16}, {"TRA_PAD",1}, {"TRA_SHUFFLE",0}, {"TRA_WPT",1} } },
         { "Tesla K40m",                                      { {"TRA_DIM",16}, {"TRA_PAD",1}, {"TRA_SHUFFLE",0}, {"TRA_WPT",1} } },
-        { "default",                                         { {"TRA_DIM",8}, {"TRA_PAD",0}, {"TRA_SHUFFLE",0}, {"TRA_WPT",1} } },
+        { "default",                                         { {"TRA_DIM",16}, {"TRA_PAD",1}, {"TRA_SHUFFLE",0}, {"TRA_WPT",1} } },
       }
     },
     { // Default
       kDeviceTypeAll, "default", {
-        { "default",                                         { {"TRA_DIM",4}, {"TRA_PAD",0}, {"TRA_SHUFFLE",0}, {"TRA_WPT",1} } },
+        { "default",                                         { {"TRA_DIM",16}, {"TRA_PAD",1}, {"TRA_SHUFFLE",1}, {"TRA_WPT",1} } },
       }
     },
   }
diff --git a/src/database/kernels/xaxpy.hpp b/src/database/kernels/xaxpy.hpp
index 905ee084..78ff3288 100644
--- a/src/database/kernels/xaxpy.hpp
+++ b/src/database/kernels/xaxpy.hpp
@@ -41,7 +41,7 @@ const Database::DatabaseEntry Database::XaxpySingle = {
         { "Oland",                                           { {"VW",1}, {"WGS",128}, {"WPT",1} } },
         { "Pitcairn",                                        { {"VW",2}, {"WGS",128}, {"WPT",1} } },
         { "Tahiti",                                          { {"VW",2}, {"WGS",64}, {"WPT",1} } },
-        { "default",                                         { {"VW",1}, {"WGS",64}, {"WPT",1} } },
+        { "default",                                         { {"VW",2}, {"WGS",256}, {"WPT",1} } },
       }
     },
     { // ARM GPUs
@@ -55,7 +55,7 @@ const Database::DatabaseEntry Database::XaxpySingle = {
         { "Intel(R) Core(TM) i5-6200U CPU @ 2.30GHz",        { {"VW",1}, {"WGS",512}, {"WPT",1} } },
         { "Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz",         { {"VW",4}, {"WGS",256}, {"WPT",1} } },
         { "Intel(R) Core(TM) i7-5930K CPU @ 3.50GHz",        { {"VW",1}, {"WGS",128}, {"WPT",1} } },
-        { "default",                                         { {"VW",1}, {"WGS",128}, {"WPT",1} } },
+        { "default",                                         { {"VW",2}, {"WGS",256}, {"WPT",1} } },
       }
     },
     { // Intel GPUs
@@ -88,12 +88,12 @@ const Database::DatabaseEntry Database::XaxpySingle = {
         { "GeForce GTX TITAN X",                             { {"VW",1}, {"WGS",64}, {"WPT",1} } },
         { "Tesla K20m",                                      { {"VW",4}, {"WGS",128}, {"WPT",1} } },
         { "Tesla K40m",                                      { {"VW",4}, {"WGS",128}, {"WPT",1} } },
-        { "default",                                         { {"VW",1}, {"WGS",64}, {"WPT",1} } },
+        { "default",                                         { {"VW",4}, {"WGS",64}, {"WPT",1} } },
       }
     },
     { // Default
       kDeviceTypeAll, "default", {
-        { "default",                                         { {"VW",1}, {"WGS",64}, {"WPT",1} } },
+        { "default",                                         { {"VW",2}, {"WGS",128}, {"WPT",1} } },
       }
     },
   }
@@ -110,7 +110,7 @@ const Database::DatabaseEntry Database::XaxpyComplexSingle = {
         { "Oland",                                           { {"VW",1}, {"WGS",128}, {"WPT",1} } },
         { "Pitcairn",                                        { {"VW",1}, {"WGS",64}, {"WPT",1} } },
         { "Tahiti",                                          { {"VW",1}, {"WGS",64}, {"WPT",1} } },
-        { "default",                                         { {"VW",1}, {"WGS",64}, {"WPT",1} } },
+        { "default",                                         { {"VW",1}, {"WGS",128}, {"WPT",1} } },
       }
     },
     { // ARM GPUs
@@ -124,7 +124,7 @@ const Database::DatabaseEntry Database::XaxpyComplexSingle = {
         { "Intel(R) Core(TM) i5-6200U CPU @ 2.30GHz",        { {"VW",4}, {"WGS",256}, {"WPT",1} } },
         { "Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz",         { {"VW",1}, {"WGS",1024}, {"WPT",2} } },
         { "Intel(R) Core(TM) i7-5930K CPU @ 3.50GHz",        { {"VW",2}, {"WGS",1024}, {"WPT",1} } },
-        { "default",                                         { {"VW",1}, {"WGS",256}, {"WPT",1} } },
+        { "default",                                         { {"VW",8}, {"WGS",1024}, {"WPT",1} } },
       }
     },
     { // Intel GPUs
@@ -134,7 +134,7 @@ const Database::DatabaseEntry Database::XaxpyComplexSingle = {
         { "Intel(R) HD Graphics Skylake ULT GT2",            { {"VW",2}, {"WGS",512}, {"WPT",1} } },
         { "Iris",                                            { {"VW",2}, {"WGS",128}, {"WPT",1} } },
         { "Iris Pro",                                        { {"VW",1}, {"WGS",256}, {"WPT",8} } },
-        { "default",                                         { {"VW",1}, {"WGS",64}, {"WPT",1} } },
+        { "default",                                         { {"VW",1}, {"WGS",128}, {"WPT",8} } },
       }
     },
     { // Intel accelerators
@@ -157,12 +157,12 @@ const Database::DatabaseEntry Database::XaxpyComplexSingle = {
         { "GeForce GTX TITAN X",                             { {"VW",1}, {"WGS",512}, {"WPT",1} } },
         { "Tesla K20m",                                      { {"VW",1}, {"WGS",128}, {"WPT",1} } },
         { "Tesla K40m",                                      { {"VW",1}, {"WGS",128}, {"WPT",1} } },
-        { "default",                                         { {"VW",1}, {"WGS",64}, {"WPT",1} } },
+        { "default",                                         { {"VW",1}, {"WGS",256}, {"WPT",1} } },
       }
     },
     { // Default
       kDeviceTypeAll, "default", {
-        { "default",                                         { {"VW",1}, {"WGS",64}, {"WPT",1} } },
+        { "default",                                         { {"VW",1}, {"WGS",128}, {"WPT",1} } },
       }
     },
   }
@@ -193,7 +193,7 @@ const Database::DatabaseEntry Database::XaxpyDouble = {
         { "Intel(R) Core(TM) i5-6200U CPU @ 2.30GHz",        { {"VW",1}, {"WGS",1024}, {"WPT",1} } },
         { "Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz",         { {"VW",8}, {"WGS",64}, {"WPT",1} } },
         { "Intel(R) Core(TM) i7-5930K CPU @ 3.50GHz",        { {"VW",8}, {"WGS",2048}, {"WPT",1} } },
-        { "default",                                         { {"VW",1}, {"WGS",64}, {"WPT",1} } },
+        { "default",                                         { {"VW",8}, {"WGS",512}, {"WPT",1} } },
       }
     },
     { // Intel accelerators
@@ -216,7 +216,7 @@ const Database::DatabaseEntry Database::XaxpyDouble = {
         { "GeForce GTX TITAN X",                             { {"VW",1}, {"WGS",512}, {"WPT",1} } },
         { "Tesla K20m",                                      { {"VW",2}, {"WGS",128}, {"WPT",1} } },
         { "Tesla K40m",                                      { {"VW",2}, {"WGS",128}, {"WPT",1} } },
-        { "default",                                         { {"VW",1}, {"WGS",64}, {"WPT",1} } },
+        { "default",                                         { {"VW",1}, {"WGS",128}, {"WPT",1} } },
       }
     },
     { // Default
@@ -238,7 +238,7 @@ const Database::DatabaseEntry Database::XaxpyComplexDouble = {
         { "Oland",                                           { {"VW",1}, {"WGS",256}, {"WPT",1} } },
         { "Pitcairn",                                        { {"VW",1}, {"WGS",128}, {"WPT",1} } },
         { "Tahiti",                                          { {"VW",1}, {"WGS",128}, {"WPT",1} } },
-        { "default",                                         { {"VW",1}, {"WGS",64}, {"WPT",1} } },
+        { "default",                                         { {"VW",1}, {"WGS",128}, {"WPT",1} } },
       }
     },
     { // ARM GPUs
@@ -252,7 +252,7 @@ const Database::DatabaseEntry Database::XaxpyComplexDouble = {
         { "Intel(R) Core(TM) i5-6200U CPU @ 2.30GHz",        { {"VW",8}, {"WGS",128}, {"WPT",1} } },
         { "Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz",         { {"VW",8}, {"WGS",512}, {"WPT",1} } },
         { "Intel(R) Core(TM) i7-5930K CPU @ 3.50GHz",        { {"VW",1}, {"WGS",256}, {"WPT",1} } },
-        { "default",                                         { {"VW",1}, {"WGS",128}, {"WPT",1} } },
+        { "default",                                         { {"VW",4}, {"WGS",1024}, {"WPT",1} } },
       }
     },
     { // Intel accelerators
@@ -280,7 +280,7 @@ const Database::DatabaseEntry Database::XaxpyComplexDouble = {
     },
     { // Default
       kDeviceTypeAll, "default", {
-        { "default",                                         { {"VW",1}, {"WGS",64}, {"WPT",1} } },
+        { "default",                                         { {"VW",1}, {"WGS",128}, {"WPT",1} } },
       }
     },
   }
diff --git a/src/database/kernels/xdot.hpp b/src/database/kernels/xdot.hpp
index e36dd8ca..51ab4099 100644
--- a/src/database/kernels/xdot.hpp
+++ b/src/database/kernels/xdot.hpp
@@ -41,7 +41,7 @@ const Database::DatabaseEntry Database::XdotSingle = {
         { "Oland",                                           { {"WGS1",256}, {"WGS2",32} } },
         { "Pitcairn",                                        { {"WGS1",128}, {"WGS2",32} } },
         { "Tahiti",                                          { {"WGS1",128}, {"WGS2",32} } },
-        { "default",                                         { {"WGS1",128}, {"WGS2",32} } },
+        { "default",                                         { {"WGS1",256}, {"WGS2",32} } },
       }
     },
     { // Intel CPUs
@@ -56,7 +56,7 @@ const Database::DatabaseEntry Database::XdotSingle = {
         { "Intel(R) HD Graphics Haswell Ultrabook GT2 Mobile", { {"WGS1",32}, {"WGS2",32} } },
         { "Intel(R) HD Graphics Skylake ULT GT2",            { {"WGS1",64}, {"WGS2",32} } },
         { "Iris Pro",                                        { {"WGS1",512}, {"WGS2",64} } },
-        { "default",                                         { {"WGS1",32}, {"WGS2",32} } },
+        { "default",                                         { {"WGS1",64}, {"WGS2",32} } },
       }
     },
     { // NVIDIA GPUs
@@ -70,12 +70,12 @@ const Database::DatabaseEntry Database::XdotSingle = {
         { "GeForce GTX 980",                                 { {"WGS1",256}, {"WGS2",32} } },
         { "GeForce GTX TITAN X",                             { {"WGS1",256}, {"WGS2",32} } },
         { "Tesla K20m",                                      { {"WGS1",1024}, {"WGS2",32} } },
-        { "default",                                         { {"WGS1",128}, {"WGS2",32} } },
+        { "default",                                         { {"WGS1",256}, {"WGS2",256} } },
       }
     },
     { // Default
       kDeviceTypeAll, "default", {
-        { "default",                                         { {"WGS1",32}, {"WGS2",32} } },
+        { "default",                                         { {"WGS1",256}, {"WGS2",32} } },
       }
     },
   }
@@ -92,7 +92,7 @@ const Database::DatabaseEntry Database::XdotComplexSingle = {
         { "Oland",                                           { {"WGS1",128}, {"WGS2",32} } },
         { "Pitcairn",                                        { {"WGS1",256}, {"WGS2",32} } },
         { "Tahiti",                                          { {"WGS1",64}, {"WGS2",32} } },
-        { "default",                                         { {"WGS1",64}, {"WGS2",32} } },
+        { "default",                                         { {"WGS1",256}, {"WGS2",32} } },
       }
     },
     { // Intel CPUs
@@ -121,12 +121,12 @@ const Database::DatabaseEntry Database::XdotComplexSingle = {
         { "GeForce GTX 980",                                 { {"WGS1",256}, {"WGS2",64} } },
         { "GeForce GTX TITAN X",                             { {"WGS1",256}, {"WGS2",32} } },
         { "Tesla K20m",                                      { {"WGS1",512}, {"WGS2",32} } },
-        { "default",                                         { {"WGS1",64}, {"WGS2",32} } },
+        { "default",                                         { {"WGS1",512}, {"WGS2",64} } },
       }
     },
     { // Default
       kDeviceTypeAll, "default", {
-        { "default",                                         { {"WGS1",32}, {"WGS2",32} } },
+        { "default",                                         { {"WGS1",256}, {"WGS2",32} } },
       }
     },
   }
@@ -143,7 +143,7 @@ const Database::DatabaseEntry Database::XdotDouble = {
         { "Oland",                                           { {"WGS1",256}, {"WGS2",32} } },
         { "Pitcairn",                                        { {"WGS1",128}, {"WGS2",32} } },
         { "Tahiti",                                          { {"WGS1",256}, {"WGS2",32} } },
-        { "default",                                         { {"WGS1",64}, {"WGS2",32} } },
+        { "default",                                         { {"WGS1",128}, {"WGS2",32} } },
       }
     },
     { // Intel CPUs
@@ -163,12 +163,12 @@ const Database::DatabaseEntry Database::XdotDouble = {
         { "GeForce GTX 980",                                 { {"WGS1",128}, {"WGS2",32} } },
         { "GeForce GTX TITAN X",                             { {"WGS1",256}, {"WGS2",32} } },
         { "Tesla K20m",                                      { {"WGS1",512}, {"WGS2",32} } },
-        { "default",                                         { {"WGS1",64}, {"WGS2",32} } },
+        { "default",                                         { {"WGS1",256}, {"WGS2",64} } },
       }
     },
     { // Default
       kDeviceTypeAll, "default", {
-        { "default",                                         { {"WGS1",64}, {"WGS2",32} } },
+        { "default",                                         { {"WGS1",128}, {"WGS2",64} } },
       }
     },
   }
@@ -185,7 +185,7 @@ const Database::DatabaseEntry Database::XdotComplexDouble = {
         { "Oland",                                           { {"WGS1",256}, {"WGS2",32} } },
         { "Pitcairn",                                        { {"WGS1",256}, {"WGS2",32} } },
         { "Tahiti",                                          { {"WGS1",256}, {"WGS2",32} } },
-        { "default",                                         { {"WGS1",64}, {"WGS2",32} } },
+        { "default",                                         { {"WGS1",256}, {"WGS2",32} } },
       }
     },
     { // Intel CPUs
@@ -205,12 +205,12 @@ const Database::DatabaseEntry Database::XdotComplexDouble = {
         { "GeForce GTX 980",                                 { {"WGS1",64}, {"WGS2",32} } },
         { "GeForce GTX TITAN X",                             { {"WGS1",128}, {"WGS2",32} } },
         { "Tesla K20m",                                      { {"WGS1",128}, {"WGS2",32} } },
-        { "default",                                         { {"WGS1",64}, {"WGS2",32} } },
+        { "default",                                         { {"WGS1",128}, {"WGS2",64} } },
       }
     },
     { // Default
       kDeviceTypeAll, "default", {
-        { "default",                                         { {"WGS1",64}, {"WGS2",32} } },
+        { "default",                                         { {"WGS1",256}, {"WGS2",64} } },
       }
     },
   }
diff --git a/src/database/kernels/xgemv.hpp b/src/database/kernels/xgemv.hpp
index 6d680b06..03b25bdc 100644
--- a/src/database/kernels/xgemv.hpp
+++ b/src/database/kernels/xgemv.hpp
@@ -48,7 +48,7 @@ const Database::DatabaseEntry Database::XgemvSingle = {
       kDeviceTypeCPU, "Intel", {
         { "Intel(R) Core(TM) i5-6200U CPU @ 2.30GHz",        { {"WGS1",64}, {"WPT1",1} } },
         { "Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz",         { {"WGS1",64}, {"WPT1",4} } },
-        { "default",                                         { {"WGS1",64}, {"WPT1",1} } },
+        { "default",                                         { {"WGS1",64}, {"WPT1",4} } },
       }
     },
     { // Intel GPUs
@@ -81,7 +81,7 @@ const Database::DatabaseEntry Database::XgemvSingle = {
         { "GeForce GTX TITAN X",                             { {"WGS1",256}, {"WPT1",1} } },
         { "Tesla K20m",                                      { {"WGS1",128}, {"WPT1",1} } },
         { "Tesla K40m",                                      { {"WGS1",256}, {"WPT1",1} } },
-        { "default",                                         { {"WGS1",64}, {"WPT1",1} } },
+        { "default",                                         { {"WGS1",256}, {"WPT1",1} } },
       }
     },
     { // Default
@@ -161,14 +161,14 @@ const Database::DatabaseEntry Database::XgemvDouble = {
         { "Oland",                                           { {"WGS1",256}, {"WPT1",1} } },
         { "Pitcairn",                                        { {"WGS1",256}, {"WPT1",1} } },
         { "Tahiti",                                          { {"WGS1",256}, {"WPT1",1} } },
-        { "default",                                         { {"WGS1",64}, {"WPT1",1} } },
+        { "default",                                         { {"WGS1",256}, {"WPT1",1} } },
       }
     },
     { // Intel CPUs
       kDeviceTypeCPU, "Intel", {
         { "Intel(R) Core(TM) i5-6200U CPU @ 2.30GHz",        { {"WGS1",64}, {"WPT1",2} } },
         { "Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz",         { {"WGS1",64}, {"WPT1",4} } },
-        { "default",                                         { {"WGS1",64}, {"WPT1",2} } },
+        { "default",                                         { {"WGS1",64}, {"WPT1",4} } },
       }
     },
     { // Intel accelerators
@@ -191,12 +191,12 @@ const Database::DatabaseEntry Database::XgemvDouble = {
         { "GeForce GTX TITAN X",                             { {"WGS1",64}, {"WPT1",1} } },
         { "Tesla K20m",                                      { {"WGS1",256}, {"WPT1",1} } },
         { "Tesla K40m",                                      { {"WGS1",256}, {"WPT1",1} } },
-        { "default",                                         { {"WGS1",64}, {"WPT1",1} } },
+        { "default",                                         { {"WGS1",128}, {"WPT1",1} } },
       }
     },
     { // Default
       kDeviceTypeAll, "default", {
-        { "default",                                         { {"WGS1",64}, {"WPT1",1} } },
+        { "default",                                         { {"WGS1",128}, {"WPT1",1} } },
       }
     },
   }
@@ -220,7 +220,7 @@ const Database::DatabaseEntry Database::XgemvComplexDouble = {
       kDeviceTypeCPU, "Intel", {
         { "Intel(R) Core(TM) i5-6200U CPU @ 2.30GHz",        { {"WGS1",64}, {"WPT1",1} } },
         { "Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz",         { {"WGS1",64}, {"WPT1",4} } },
-        { "default",                                         { {"WGS1",64}, {"WPT1",1} } },
+        { "default",                                         { {"WGS1",64}, {"WPT1",4} } },
       }
     },
     { // Intel accelerators
@@ -234,7 +234,7 @@ const Database::DatabaseEntry Database::XgemvComplexDouble = {
         { "GRID K520",                                       { {"WGS1",128}, {"WPT1",1} } },
         { "GeForce GTX 480",                                 { {"WGS1",64}, {"WPT1",1} } },
         { "GeForce GTX 670",                                 { {"WGS1",128}, {"WPT1",1} } },
-        { "default",                                         { {"WGS1",64}, {"WPT1",1} } },
+        { "default",                                         { {"WGS1",128}, {"WPT1",1} } },
       }
     },
     { // Default
diff --git a/src/database/kernels/xgemv_fast.hpp b/src/database/kernels/xgemv_fast.hpp
index 65b15030..7e948540 100644
--- a/src/database/kernels/xgemv_fast.hpp
+++ b/src/database/kernels/xgemv_fast.hpp
@@ -48,7 +48,7 @@ const Database::DatabaseEntry Database::XgemvFastSingle = {
       kDeviceTypeCPU, "Intel", {
         { "Intel(R) Core(TM) i5-6200U CPU @ 2.30GHz",        { {"VW2",4}, {"WGS2",128}, {"WPT2",4} } },
         { "Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz",         { {"VW2",1}, {"WGS2",64}, {"WPT2",4} } },
-        { "default",                                         { {"VW2",1}, {"WGS2",64}, {"WPT2",4} } },
+        { "default",                                         { {"VW2",4}, {"WGS2",64}, {"WPT2",4} } },
       }
     },
     { // Intel GPUs
@@ -58,7 +58,7 @@ const Database::DatabaseEntry Database::XgemvFastSingle = {
         { "Intel(R) HD Graphics Skylake ULT GT2",            { {"VW2",1}, {"WGS2",256}, {"WPT2",1} } },
         { "Iris",                                            { {"VW2",1}, {"WGS2",128}, {"WPT2",2} } },
         { "Iris Pro",                                        { {"VW2",1}, {"WGS2",128}, {"WPT2",2} } },
-        { "default",                                         { {"VW2",1}, {"WGS2",128}, {"WPT2",1} } },
+        { "default",                                         { {"VW2",2}, {"WGS2",64}, {"WPT2",2} } },
       }
     },
     { // Intel accelerators
@@ -81,7 +81,7 @@ const Database::DatabaseEntry Database::XgemvFastSingle = {
         { "GeForce GTX TITAN X",                             { {"VW2",1}, {"WGS2",64}, {"WPT2",1} } },
         { "Tesla K20m",                                      { {"VW2",1}, {"WGS2",256}, {"WPT2",1} } },
         { "Tesla K40m",                                      { {"VW2",1}, {"WGS2",256}, {"WPT2",1} } },
-        { "default",                                         { {"VW2",1}, {"WGS2",64}, {"WPT2",1} } },
+        { "default",                                         { {"VW2",1}, {"WGS2",256}, {"WPT2",1} } },
       }
     },
     { // Default
@@ -120,7 +120,7 @@ const Database::DatabaseEntry Database::XgemvFastComplexSingle = {
         { "Intel(R) HD Graphics Skylake ULT GT2",            { {"VW2",1}, {"WGS2",64}, {"WPT2",1} } },
         { "Iris",                                            { {"VW2",1}, {"WGS2",64}, {"WPT2",1} } },
         { "Iris Pro",                                        { {"VW2",4}, {"WGS2",128}, {"WPT2",4} } },
-        { "default",                                         { {"VW2",1}, {"WGS2",64}, {"WPT2",1} } },
+        { "default",                                         { {"VW2",2}, {"WGS2",64}, {"WPT2",2} } },
       }
     },
     { // Intel accelerators
@@ -189,7 +189,7 @@ const Database::DatabaseEntry Database::XgemvFastDouble = {
         { "GeForce GTX TITAN X",                             { {"VW2",1}, {"WGS2",128}, {"WPT2",1} } },
         { "Tesla K20m",                                      { {"VW2",1}, {"WGS2",128}, {"WPT2",1} } },
         { "Tesla K40m",                                      { {"VW2",1}, {"WGS2",256}, {"WPT2",1} } },
-        { "default",                                         { {"VW2",1}, {"WGS2",64}, {"WPT2",1} } },
+        { "default",                                         { {"VW2",1}, {"WGS2",256}, {"WPT2",1} } },
       }
     },
     { // Default
diff --git a/src/database/kernels/xgemv_fast_rot.hpp b/src/database/kernels/xgemv_fast_rot.hpp
index 9822fb20..42d3c5d1 100644
--- a/src/database/kernels/xgemv_fast_rot.hpp
+++ b/src/database/kernels/xgemv_fast_rot.hpp
@@ -32,7 +32,7 @@ const Database::DatabaseEntry Database::XgemvFastRotSingle = {
       kDeviceTypeGPU, "Intel", {
         { "Intel(R) HD Graphics Skylake ULT GT2",            { {"VW3",4}, {"WGS3",128}, {"WPT3",16} } },
         { "Iris Pro",                                        { {"VW3",4}, {"WGS3",32}, {"WPT3",16} } },
-        { "default",                                         { {"VW3",4}, {"WGS3",32}, {"WPT3",16} } },
+        { "default",                                         { {"VW3",4}, {"WGS3",128}, {"WPT3",16} } },
       }
     },
     { // NVIDIA GPUs
@@ -43,7 +43,7 @@ const Database::DatabaseEntry Database::XgemvFastRotSingle = {
     },
     { // Default
       kDeviceTypeAll, "default", {
-        { "default",                                         { {"VW3",1}, {"WGS3",16}, {"WPT3",8} } },
+        { "default",                                         { {"VW3",8}, {"WGS3",32}, {"WPT3",32} } },
       }
     },
   }
@@ -69,12 +69,12 @@ const Database::DatabaseEntry Database::XgemvFastRotComplexSingle = {
       kDeviceTypeGPU, "Intel", {
         { "Intel(R) HD Graphics Skylake ULT GT2",            { {"VW3",2}, {"WGS3",32}, {"WPT3",16} } },
         { "Iris Pro",                                        { {"VW3",4}, {"WGS3",16}, {"WPT3",16} } },
-        { "default",                                         { {"VW3",2}, {"WGS3",16}, {"WPT3",16} } },
+        { "default",                                         { {"VW3",2}, {"WGS3",32}, {"WPT3",8} } },
       }
     },
     { // Default
       kDeviceTypeAll, "default", {
-        { "default",                                         { {"VW3",2}, {"WGS3",16}, {"WPT3",16} } },
+        { "default",                                         { {"VW3",4}, {"WGS3",16}, {"WPT3",16} } },
       }
     },
   }
@@ -104,7 +104,7 @@ const Database::DatabaseEntry Database::XgemvFastRotDouble = {
     },
     { // Default
       kDeviceTypeAll, "default", {
-        { "default",                                         { {"VW3",1}, {"WGS3",16}, {"WPT3",8} } },
+        { "default",                                         { {"VW3",4}, {"WGS3",16}, {"WPT3",16} } },
       }
     },
   }
@@ -128,7 +128,7 @@ const Database::DatabaseEntry Database::XgemvFastRotComplexDouble = {
     },
     { // Default
       kDeviceTypeAll, "default", {
-        { "default",                                         { {"VW3",4}, {"WGS3",16}, {"WPT3",16} } },
+        { "default",                                         { {"VW3",8}, {"WGS3",32}, {"WPT3",16} } },
       }
     },
   }
diff --git a/src/database/kernels/xger.hpp b/src/database/kernels/xger.hpp
index 216925fc..06f65c46 100644
--- a/src/database/kernels/xger.hpp
+++ b/src/database/kernels/xger.hpp
@@ -41,7 +41,7 @@ const Database::DatabaseEntry Database::XgerSingle = {
         { "Oland",                                           { {"WGS1",32}, {"WGS2",4}, {"WPT",2} } },
         { "Pitcairn",                                        { {"WGS1",64}, {"WGS2",1}, {"WPT",1} } },
         { "Tahiti",                                          { {"WGS1",256}, {"WGS2",1}, {"WPT",1} } },
-        { "default",                                         { {"WGS1",32}, {"WGS2",1}, {"WPT",1} } },
+        { "default",                                         { {"WGS1",32}, {"WGS2",4}, {"WPT",1} } },
       }
     },
     { // ARM GPUs
@@ -54,7 +54,7 @@ const Database::DatabaseEntry Database::XgerSingle = {
       kDeviceTypeCPU, "Intel", {
         { "Intel(R) Core(TM) i5-6200U CPU @ 2.30GHz",        { {"WGS1",128}, {"WGS2",2}, {"WPT",4} } },
         { "Intel(R) Core(TM) i7-5930K CPU @ 3.50GHz",        { {"WGS1",128}, {"WGS2",1}, {"WPT",4} } },
-        { "default",                                         { {"WGS1",128}, {"WGS2",1}, {"WPT",4} } },
+        { "default",                                         { {"WGS1",512}, {"WGS2",1}, {"WPT",4} } },
       }
     },
     { // Intel GPUs
@@ -63,7 +63,7 @@ const Database::DatabaseEntry Database::XgerSingle = {
         { "Intel(R) HD Graphics Haswell Ultrabook GT2 Mobile", { {"WGS1",256}, {"WGS2",2}, {"WPT",2} } },
         { "Intel(R) HD Graphics Skylake ULT GT2",            { {"WGS1",8}, {"WGS2",8}, {"WPT",4} } },
         { "Iris Pro",                                        { {"WGS1",64}, {"WGS2",1}, {"WPT",4} } },
-        { "default",                                         { {"WGS1",8}, {"WGS2",1}, {"WPT",2} } },
+        { "default",                                         { {"WGS1",16}, {"WGS2",8}, {"WPT",4} } },
       }
     },
     { // NVIDIA GPUs
@@ -75,7 +75,7 @@ const Database::DatabaseEntry Database::XgerSingle = {
         { "GeForce GTX 680",                                 { {"WGS1",128}, {"WGS2",1}, {"WPT",4} } },
         { "GeForce GTX 750",                                 { {"WGS1",64}, {"WGS2",16}, {"WPT",4} } },
         { "GeForce GTX TITAN",                               { {"WGS1",32}, {"WGS2",4}, {"WPT",2} } },
-        { "default",                                         { {"WGS1",32}, {"WGS2",1}, {"WPT",1} } },
+        { "default",                                         { {"WGS1",256}, {"WGS2",1}, {"WPT",4} } },
       }
     },
     { // Default
@@ -97,7 +97,7 @@ const Database::DatabaseEntry Database::XgerComplexSingle = {
         { "Oland",                                           { {"WGS1",4}, {"WGS2",8}, {"WPT",1} } },
         { "Pitcairn",                                        { {"WGS1",128}, {"WGS2",2}, {"WPT",1} } },
         { "Tahiti",                                          { {"WGS1",64}, {"WGS2",2}, {"WPT",1} } },
-        { "default",                                         { {"WGS1",4}, {"WGS2",1}, {"WPT",1} } },
+        { "default",                                         { {"WGS1",256}, {"WGS2",1}, {"WPT",1} } },
       }
     },
     { // ARM GPUs
@@ -110,7 +110,7 @@ const Database::DatabaseEntry Database::XgerComplexSingle = {
       kDeviceTypeCPU, "Intel", {
         { "Intel(R) Core(TM) i5-6200U CPU @ 2.30GHz",        { {"WGS1",256}, {"WGS2",1}, {"WPT",4} } },
         { "Intel(R) Core(TM) i7-5930K CPU @ 3.50GHz",        { {"WGS1",512}, {"WGS2",4}, {"WPT",2} } },
-        { "default",                                         { {"WGS1",256}, {"WGS2",1}, {"WPT",2} } },
+        { "default",                                         { {"WGS1",512}, {"WGS2",1}, {"WPT",4} } },
       }
     },
     { // Intel GPUs
@@ -119,7 +119,7 @@ const Database::DatabaseEntry Database::XgerComplexSingle = {
         { "Intel(R) HD Graphics Haswell Ultrabook GT2 Mobile", { {"WGS1",128}, {"WGS2",4}, {"WPT",1} } },
         { "Intel(R) HD Graphics Skylake ULT GT2",            { {"WGS1",128}, {"WGS2",4}, {"WPT",2} } },
         { "Iris Pro",                                        { {"WGS1",16}, {"WGS2",2}, {"WPT",4} } },
-        { "default",                                         { {"WGS1",16}, {"WGS2",1}, {"WPT",1} } },
+        { "default",                                         { {"WGS1",32}, {"WGS2",1}, {"WPT",2} } },
       }
     },
     { // NVIDIA GPUs
@@ -131,7 +131,7 @@ const Database::DatabaseEntry Database::XgerComplexSingle = {
         { "GeForce GTX 680",                                 { {"WGS1",32}, {"WGS2",4}, {"WPT",2} } },
         { "GeForce GTX 750",                                 { {"WGS1",32}, {"WGS2",16}, {"WPT",4} } },
         { "GeForce GTX TITAN",                               { {"WGS1",16}, {"WGS2",16}, {"WPT",2} } },
-        { "default",                                         { {"WGS1",16}, {"WGS2",2}, {"WPT",2} } },
+        { "default",                                         { {"WGS1",64}, {"WGS2",2}, {"WPT",2} } },
       }
     },
     { // Default
@@ -153,7 +153,7 @@ const Database::DatabaseEntry Database::XgerDouble = {
         { "Oland",                                           { {"WGS1",128}, {"WGS2",1}, {"WPT",2} } },
         { "Pitcairn",                                        { {"WGS1",64}, {"WGS2",1}, {"WPT",1} } },
         { "Tahiti",                                          { {"WGS1",64}, {"WGS2",2}, {"WPT",1} } },
-        { "default",                                         { {"WGS1",32}, {"WGS2",1}, {"WPT",1} } },
+        { "default",                                         { {"WGS1",64}, {"WGS2",2}, {"WPT",1} } },
       }
     },
     { // ARM GPUs
@@ -166,7 +166,7 @@ const Database::DatabaseEntry Database::XgerDouble = {
       kDeviceTypeCPU, "Intel", {
         { "Intel(R) Core(TM) i5-6200U CPU @ 2.30GHz",        { {"WGS1",512}, {"WGS2",16}, {"WPT",1} } },
         { "Intel(R) Core(TM) i7-5930K CPU @ 3.50GHz",        { {"WGS1",512}, {"WGS2",8}, {"WPT",2} } },
-        { "default",                                         { {"WGS1",512}, {"WGS2",8}, {"WPT",1} } },
+        { "default",                                         { {"WGS1",512}, {"WGS2",1}, {"WPT",4} } },
       }
     },
     { // NVIDIA GPUs
@@ -178,7 +178,7 @@ const Database::DatabaseEntry Database::XgerDouble = {
         { "GeForce GTX 680",                                 { {"WGS1",128}, {"WGS2",4}, {"WPT",2} } },
         { "GeForce GTX 750",                                 { {"WGS1",256}, {"WGS2",2}, {"WPT",2} } },
         { "GeForce GTX TITAN",                               { {"WGS1",16}, {"WGS2",8}, {"WPT",2} } },
-        { "default",                                         { {"WGS1",16}, {"WGS2",2}, {"WPT",1} } },
+        { "default",                                         { {"WGS1",256}, {"WGS2",2}, {"WPT",2} } },
       }
     },
     { // Default
@@ -200,7 +200,7 @@ const Database::DatabaseEntry Database::XgerComplexDouble = {
         { "Oland",                                           { {"WGS1",16}, {"WGS2",16}, {"WPT",2} } },
         { "Pitcairn",                                        { {"WGS1",64}, {"WGS2",4}, {"WPT",1} } },
         { "Tahiti",                                          { {"WGS1",32}, {"WGS2",4}, {"WPT",1} } },
-        { "default",                                         { {"WGS1",16}, {"WGS2",1}, {"WPT",1} } },
+        { "default",                                         { {"WGS1",32}, {"WGS2",4}, {"WPT",1} } },
       }
     },
     { // ARM GPUs
@@ -213,7 +213,7 @@ const Database::DatabaseEntry Database::XgerComplexDouble = {
       kDeviceTypeCPU, "Intel", {
         { "Intel(R) Core(TM) i5-6200U CPU @ 2.30GHz",        { {"WGS1",512}, {"WGS2",4}, {"WPT",2} } },
         { "Intel(R) Core(TM) i7-5930K CPU @ 3.50GHz",        { {"WGS1",256}, {"WGS2",1}, {"WPT",2} } },
-        { "default",                                         { {"WGS1",256}, {"WGS2",1}, {"WPT",2} } },
+        { "default",                                         { {"WGS1",512}, {"WGS2",1}, {"WPT",4} } },
       }
     },
     { // NVIDIA GPUs
@@ -225,7 +225,7 @@ const Database::DatabaseEntry Database::XgerComplexDouble = {
         { "GeForce GTX 680",                                 { {"WGS1",8}, {"WGS2",16}, {"WPT",1} } },
         { "GeForce GTX 750",                                 { {"WGS1",8}, {"WGS2",32}, {"WPT",4} } },
         { "GeForce GTX TITAN",                               { {"WGS1",32}, {"WGS2",4}, {"WPT",2} } },
-        { "default",                                         { {"WGS1",8}, {"WGS2",2}, {"WPT",1} } },
+        { "default",                                         { {"WGS1",16}, {"WGS2",8}, {"WPT",2} } },
       }
     },
     { // Default
diff --git a/src/tuning/kernels/xgemm.cpp b/src/tuning/kernels/xgemm.cpp
index 898b8435..eb7c8a66 100644
--- a/src/tuning/kernels/xgemm.cpp
+++ b/src/tuning/kernels/xgemm.cpp
@@ -48,7 +48,7 @@ class TuneXgemm {
   static size_t DefaultM() { return 1024; }
   static size_t DefaultN() { return 1024; }
   static size_t DefaultK() { return 1024; }
-  static double DefaultFraction() { return 2048.0; }
+  static double DefaultFraction() { return 256.0; }
 
   // Describes how to obtain the sizes of the buffers
   static size_t GetSizeX(const Arguments<T> &) { return 1; } // N/A for this kernel
@@ -67,9 +67,9 @@ class TuneXgemm {
     tuner.AddParameter(id, "NDIMC", {8, 16, 32});
     tuner.AddParameter(id, "MDIMA", {8, 16, 32});
     tuner.AddParameter(id, "NDIMB", {8, 16, 32});
-    tuner.AddParameter(id, "KWI", {2, 8});
-    tuner.AddParameter(id, "VWM", {1, 2, 4, 8});
-    tuner.AddParameter(id, "VWN", {1, 2, 4, 8});
+    tuner.AddParameter(id, "KWI", {2});
+    tuner.AddParameter(id, "VWM", {1, 2, 4});
+    tuner.AddParameter(id, "VWN", {1, 2, 4});
     tuner.AddParameter(id, "STRM", {0, 1});
     tuner.AddParameter(id, "STRN", {0, 1});
     tuner.AddParameter(id, "SA", {0, 1});