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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 auto-tuner to tune the xaxpy OpenCL kernels.
//
// =================================================================================================
#include <string>
#include <vector>
#include "utilities/utilities.hpp"
#include "tuning/tuning.hpp"
namespace clblast {
// =================================================================================================
// Settings for this kernel (default command-line arguments)
TunerDefaults XaxpyGetTunerDefaults(const int) {
auto settings = TunerDefaults();
settings.options = {kArgN, kArgAlpha};
settings.default_n = 4096*1024;
return settings;
}
// Settings for this kernel (general)
template <typename T>
TunerSettings XaxpyGetTunerSettings(const int, const Arguments<T> &args) {
auto settings = TunerSettings();
// Identification of the kernel
settings.kernel_family = "xaxpy";
settings.kernel_name = "XaxpyFastest";
settings.sources =
#include "../src/kernels/level1/level1.opencl"
#include "../src/kernels/level1/xaxpy.opencl"
;
// Buffer sizes
settings.size_x = args.n;
settings.size_y = args.n;
// Inputs and outputs IDs (X:0, Y:1, A:2, B:3, C:4, temp:5)
settings.inputs = {0, 1};
settings.outputs = {1};
// Sets the base thread configuration
settings.global_size = {args.n};
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"}};
settings.div_global = {{"WPT"},{"VW"}};
// Sets the tuning parameters and their possible values
settings.parameters = {
{"WGS", {64, 128, 256, 512, 1024, 2048}},
{"WPT", {1, 2, 4, 8}},
{"VW", {1, 2, 4, 8}},
};
// Describes how to compute the performance metrics
settings.metric_amount = 3 * args.n * GetBytes(args.precision);
settings.performance_unit = "GB/s";
return settings;
}
// Tests for valid arguments
template <typename T>
void XaxpyTestValidArguments(const int, const Arguments<T> &args) {
if (!IsMultiple(args.n, 64)) {
throw std::runtime_error("'XaxpyFastest' requires 'n' to be a multiple of WGS*WPT*VW");
}
}
std::vector<Constraint> XaxpySetConstraints(const int) { return {}; }
template <typename T>
LocalMemSizeInfo XaxpyComputeLocalMemSize(const int) {
return { [] (std::vector<size_t>) -> size_t { return 0; }, {} };
}
// Sets the kernel's arguments
template <typename T>
void XaxpySetArguments(const int, Kernel &kernel, const Arguments<T> &args, std::vector<Buffer<T>>& buffers) {
kernel.SetArgument(0, static_cast<int>(args.n));
kernel.SetArgument(1, GetRealArg(args.alpha));
kernel.SetArgument(2, buffers[0]()); // 0 == X vector
kernel.SetArgument(3, buffers[1]()); // 1 == Y vector
}
// =================================================================================================
} // namespace clblast
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