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// =================================================================================================
// This file is part of the CLBlast project. The project is licensed under Apache Version 2.0. This
// project loosely follows the Google C++ styleguide and uses a tab-size of two spaces and a max-
// width of 100 characters per line.
//
// Author(s):
// Cedric Nugteren <www.cedricnugteren.nl>
//
// This file uses the CLTune auto-tuner to tune the xgemv OpenCL kernels. Three variants are tuned:
// 1: The full version of the kernel
// 2: The fast version for non-transposed matrices
// 3: The fast version for transposed matrices
//
// =================================================================================================
#include <string>
#include <vector>
#include "utilities/utilities.hpp"
#include "tuning/tuning.hpp"
namespace clblast {
// =================================================================================================
// See comment at top of file for a description of the class
template <typename T, int V>
class TuneXgemv {
public:
// Settings for this kernel (default command-line arguments)
static TunerDefaults GetTunerDefaults() {
auto settings = TunerDefaults();
settings.options = {kArgM, kArgN, kArgAlpha, kArgBeta};
settings.default_m = 2048;
settings.default_n = 2048;
return settings;
}
// Settings for this kernel (general)
static TunerSettings GetTunerSettings(const Arguments<T> &args) {
auto settings = TunerSettings();
// Identification of the kernel
settings.kernel_family = (V==1) ? "xgemv" : ((V==2) ? "xgemv_fast" : "xgemv_fast_rot");
settings.kernel_name = (V==1) ? "Xgemv" : ((V==2) ? "XgemvFast" : "XgemvFastRot");
settings.sources =
#include "../src/kernels/common.opencl"
#include "../src/kernels/level2/xgemv.opencl"
#include "../src/kernels/level2/xgemv_fast.opencl"
;
// Buffer sizes
settings.size_x = args.n;
settings.size_y = args.m;
settings.size_a = args.m * args.n;
// Sets the base thread configuration
settings.global_size = {args.m};
settings.global_size_ref = settings.global_size;
settings.local_size = {1};
settings.local_size_ref = {64};
// Transforms the thread configuration based on the parameters
settings.mul_local = {{"WGS"+std::to_string(V)}};
settings.div_global = (V==1 || V==2) ?
TunerSettings::TransformVector{{"WPT"+std::to_string(V)}} :
TunerSettings::TransformVector{};
// Sets the tuning parameters and their possible values
if (V==1) {
settings.parameters = {
{"WGS"+std::to_string(V), {32, 64, 128, 256}},
{"WPT"+std::to_string(V), {1, 2, 4}},
};
}
if (V==2) {
settings.parameters = {
{"WGS"+std::to_string(V), {16, 32, 64, 128, 256}},
{"WPT"+std::to_string(V), {1, 2, 4}},
{"VW"+std::to_string(V), {1, 2, 4, 8}},
};
}
if (V==3) {
settings.parameters = {
{"WGS"+std::to_string(V), {16, 32, 64, 128}},
{"WPT"+std::to_string(V), {1, 2, 4, 8, 16, 32}},
{"VW"+std::to_string(V), {1, 2, 4, 8}},
};
}
// Describes how to compute the performance metrics
settings.metric_amount = (args.m*args.n + 2*args.m + args.n) * GetBytes(args.precision);
settings.performance_unit = "GB/s";
return settings;
}
// Tests for valid arguments
static void TestValidArguments(const Arguments<T> &) { }
// Sets the constraints and local memory size
static void SetConstraints(cltune::Tuner &tuner, const size_t id) {
if (V==2 || V==3) {
auto MultipleOfX = [] (std::vector<size_t> v) { return IsMultiple(v[0], v[1]); };
tuner.AddConstraint(id, MultipleOfX, {"WPT"+std::to_string(V), "VW"+std::to_string(V)});
}
if (V==3) {
auto LargerOrEqual = [] (std::vector<size_t> v) { return v[0] >= v[1]; };
tuner.AddConstraint(id, LargerOrEqual, {"WGS"+std::to_string(V), "WPT"+std::to_string(V)});
}
}
static void SetLocalMemorySize(cltune::Tuner &tuner, const size_t id, const Arguments<T> &args) {
if (V==1 || V==2) {
auto LocalMemorySize = [args] (std::vector<size_t> v) { return v[0]*GetBytes(args.precision); };
tuner.SetLocalMemoryUsage(id, LocalMemorySize, {"WGS"+std::to_string(V)});
}
else {
auto LocalMemorySize = [args] (std::vector<size_t> v) { return (v[0]*v[1] + v[1])*GetBytes(args.precision); };
tuner.SetLocalMemoryUsage(id, LocalMemorySize, {"WGS"+std::to_string(V), "WPT"+std::to_string(V)});
}
}
// Sets the kernel's arguments
static void SetArguments(cltune::Tuner &tuner, const Arguments<T> &args,
std::vector<T> &x_vec, std::vector<T> &y_vec,
std::vector<T> &a_mat, std::vector<T> &, std::vector<T> &,
std::vector<T> &) {
auto a_rotated = (V==3) ? 1 : 0;
tuner.AddArgumentScalar(static_cast<int>(args.m));
tuner.AddArgumentScalar(static_cast<int>(args.n));
tuner.AddArgumentScalar(GetRealArg(args.alpha));
tuner.AddArgumentScalar(GetRealArg(args.beta));
tuner.AddArgumentScalar(static_cast<int>(a_rotated));
tuner.AddArgumentInput(a_mat);
tuner.AddArgumentScalar(0);
tuner.AddArgumentScalar(static_cast<int>(args.m));
tuner.AddArgumentInput(x_vec);
tuner.AddArgumentScalar(0);
tuner.AddArgumentScalar(1);
tuner.AddArgumentOutput(y_vec);
tuner.AddArgumentScalar(0);
tuner.AddArgumentScalar(1);
tuner.AddArgumentScalar(0); // Conjugate transpose
tuner.AddArgumentScalar(0); // Additional parameter
tuner.AddArgumentScalar(0); // Banded 'kl'
tuner.AddArgumentScalar(0); // Banded 'ku'
}
};
// =================================================================================================
} // namespace clblast
// Shortcuts to the clblast namespace
using half = clblast::half;
using float2 = clblast::float2;
using double2 = clblast::double2;
// Function to tune a specific variation V (not within the clblast namespace)
template <int V>
void StartVariation(int argc, char *argv[]) {
const auto command_line_args = clblast::RetrieveCommandLineArguments(argc, argv);
switch(clblast::GetPrecision(command_line_args)) {
case clblast::Precision::kHalf: clblast::Tuner<clblast::TuneXgemv<half,V>, half>(argc, argv); break;
case clblast::Precision::kSingle: clblast::Tuner<clblast::TuneXgemv<float,V>, float>(argc, argv); break;
case clblast::Precision::kDouble: clblast::Tuner<clblast::TuneXgemv<double,V>, double>(argc, argv); break;
case clblast::Precision::kComplexSingle: clblast::Tuner<clblast::TuneXgemv<float2,V>, float2>(argc, argv); break;
case clblast::Precision::kComplexDouble: clblast::Tuner<clblast::TuneXgemv<double2,V>, double2>(argc, argv); break;
}
}
// Main function (not within the clblast namespace)
int main(int argc, char *argv[]) {
StartVariation<1>(argc, argv);
StartVariation<2>(argc, argv);
StartVariation<3>(argc, argv);
return 0;
}
// =================================================================================================
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