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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 xdot OpenCL kernels. Note that the results are
// not verified, since the result is not final and depends on the WGS2 parameter.
//
// =================================================================================================
#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 TuneXdot {
public:
// Settings for this kernel (default command-line arguments)
static TunerDefaults GetTunerDefaults() {
auto settings = TunerDefaults();
settings.options = {kArgN};
settings.default_n = 2*1024*1024;
return settings;
}
// Settings for this kernel (general)
static TunerSettings GetTunerSettings(const Arguments<T> &args) {
auto settings = TunerSettings();
// Identification of the kernel
settings.kernel_family = "xdot_"+std::to_string(V);
settings.kernel_name = (V==1) ? "Xdot" : "XdotEpilogue";
settings.sources =
#include "../src/kernels/common.opencl"
#include "../src/kernels/level1/xdot.opencl"
;
// Buffer sizes
settings.size_x = args.n;
settings.size_y = args.n;
settings.size_temp = args.n; // Worst case
// Sets the base thread configuration
settings.global_size = (V==1) ? std::vector<size_t>{2*64} : std::vector<size_t>{1};
settings.global_size_ref = (V==1) ? std::vector<size_t>{2*64*64} : std::vector<size_t>{64};
settings.local_size = {1};
settings.local_size_ref = {64};
// Transforms the thread configuration based on the parameters
settings.mul_local = (V==1) ? TunerSettings::TransformVector{{"WGS1"}} : TunerSettings::TransformVector{{"WGS2"}};
settings.mul_global = (V==1) ? TunerSettings::TransformVector{{"WGS1"}} : TunerSettings::TransformVector{{"WGS2"}};
// Sets the tuning parameters and their possible values
settings.parameters = {
{"WGS"+std::to_string(V), {32, 64, 128, 256, 512, 1024}},
};
// Describes how to compute the performance metrics
settings.metric_amount = (V==1) ? (2*args.n + 1) * GetBytes(args.precision) : 1 * GetBytes(args.precision);
settings.performance_unit = (V==1) ? "GB/s" : "N/A";
return settings;
}
// Tests for valid arguments
static void TestValidArguments(const Arguments<T> &) { }
// Sets the constraints and local memory size
static void SetConstraints(cltune::Tuner &, const size_t) { }
static void SetLocalMemorySize(cltune::Tuner &, const size_t, const Arguments<T> &) { }
// 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> &, std::vector<T> &, std::vector<T> &,
std::vector<T> &temp) {
if (V == 1) {
tuner.AddArgumentScalar(static_cast<int>(args.n));
tuner.AddArgumentInput(x_vec);
tuner.AddArgumentScalar(0);
tuner.AddArgumentScalar(1);
tuner.AddArgumentInput(y_vec);
tuner.AddArgumentScalar(0);
tuner.AddArgumentScalar(1);
tuner.AddArgumentInput(temp); // No output checking for the result - size varies
tuner.AddArgumentScalar(static_cast<int>(false));
}
else {
tuner.AddArgumentInput(temp);
tuner.AddArgumentInput(x_vec); // No output checking for the result - store somewhere
tuner.AddArgumentScalar(0);
}
}
};
// =================================================================================================
} // 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::TuneXdot<half, V>, half>(argc, argv); break;
case clblast::Precision::kSingle: clblast::Tuner<clblast::TuneXdot<float, V>, float>(argc, argv); break;
case clblast::Precision::kDouble: clblast::Tuner<clblast::TuneXdot<double, V>, double>(argc, argv); break;
case clblast::Precision::kComplexSingle: clblast::Tuner<clblast::TuneXdot<float2, V>, float2>(argc, argv); break;
case clblast::Precision::kComplexDouble: clblast::Tuner<clblast::TuneXdot<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);
return 0;
}
// =================================================================================================
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