118 lines
4.8 KiB
C++
118 lines
4.8 KiB
C++
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// =================================================================================================
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// This file is part of the CLBlast project. The project is licensed under Apache Version 2.0. This
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// project loosely follows the Google C++ styleguide and uses a tab-size of two spaces and a max-
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// width of 100 characters per line.
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//
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// Author(s):
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// Cedric Nugteren <www.cedricnugteren.nl>
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//
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// This file demonstrates the use of the SGEMM routine. It is a stand-alone example, but it does
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// require the Khronos C++ OpenCL API header file (downloaded by CMake). The example uses C++
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// features, but CLBlast can also be used using the regular C-style OpenCL API.
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//
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// Note that this example is meant for illustration purposes only. CLBlast provides other programs
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// for performance benchmarking ('client_xxxxx') and for correctness testing ('test_xxxxx').
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//
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// =================================================================================================
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#include <cstdio>
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#include <chrono>
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#include <vector>
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#define CL_USE_DEPRECATED_OPENCL_1_1_APIS // to disable deprecation warnings
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#define CL_USE_DEPRECATED_OPENCL_1_2_APIS // to disable deprecation warnings
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// Includes the C++ OpenCL API. If not yet available, it can be found here:
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// https://raw.githubusercontent.com/KhronosGroup/OpenCL-CLHPP/main/include/CL/opencl.hpp
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#define CL_HPP_TARGET_OPENCL_VERSION 120
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#define CL_HPP_MINIMUM_OPENCL_VERSION 120
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#define CL_TARGET_OPENCL_VERSION 120
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#include "opencl.hpp"
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// Includes the CLBlast library
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#include <clblast.h>
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// =================================================================================================
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// Example use of the single-precision Xgemm routine SGEMM
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int main() {
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// OpenCL platform/device settings
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const auto platform_id = 0;
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const auto device_id = 0;
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// Example SGEMM arguments
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const size_t m = 128;
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const size_t n = 64;
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const size_t k = 512;
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const float alpha = 0.7f;
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const float beta = 1.0f;
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const auto a_ld = k;
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const auto b_ld = n;
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const auto c_ld = n;
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// Initializes the OpenCL platform
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auto platforms = std::vector<cl::Platform>();
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cl::Platform::get(&platforms);
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if (platforms.size() == 0 || platform_id >= platforms.size()) { return 1; }
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auto platform = platforms[platform_id];
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// Initializes the OpenCL device
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auto devices = std::vector<cl::Device>();
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platform.getDevices(CL_DEVICE_TYPE_ALL, &devices);
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if (devices.size() == 0 || device_id >= devices.size()) { return 1; }
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auto device = devices[device_id];
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// Creates the OpenCL context, queue, and an event
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auto device_as_vector = std::vector<cl::Device>{device};
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auto context = cl::Context(device_as_vector);
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auto queue = cl::CommandQueue(context, device);
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auto event = cl_event{nullptr};
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// Populate host matrices with some example data
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auto host_a = std::vector<float>(m*k);
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auto host_b = std::vector<float>(n*k);
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auto host_c = std::vector<float>(m*n);
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for (auto &item: host_a) { item = 12.193f; }
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for (auto &item: host_b) { item = -8.199f; }
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for (auto &item: host_c) { item = 0.0f; }
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// Copy the matrices to the device
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auto device_a = cl::Buffer(context, CL_MEM_READ_WRITE, host_a.size()*sizeof(float));
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auto device_b = cl::Buffer(context, CL_MEM_READ_WRITE, host_b.size()*sizeof(float));
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auto device_c = cl::Buffer(context, CL_MEM_READ_WRITE, host_c.size()*sizeof(float));
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queue.enqueueWriteBuffer(device_a, CL_TRUE, 0, host_a.size()*sizeof(float), host_a.data());
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queue.enqueueWriteBuffer(device_b, CL_TRUE, 0, host_b.size()*sizeof(float), host_b.data());
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queue.enqueueWriteBuffer(device_c, CL_TRUE, 0, host_c.size()*sizeof(float), host_c.data());
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// Start the timer
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auto start_time = std::chrono::steady_clock::now();
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// Call the SGEMM routine. Note that the type of alpha and beta (float) determine the precision.
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auto queue_plain = queue();
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auto status = clblast::Gemm(clblast::Layout::kRowMajor,
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clblast::Transpose::kNo, clblast::Transpose::kNo,
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m, n, k,
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alpha,
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device_a(), 0, a_ld,
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device_b(), 0, b_ld,
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beta,
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device_c(), 0, c_ld,
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&queue_plain, &event);
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// Record the execution time
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if (status == clblast::StatusCode::kSuccess) {
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clWaitForEvents(1, &event);
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clReleaseEvent(event);
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}
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auto elapsed_time = std::chrono::steady_clock::now() - start_time;
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auto time_ms = std::chrono::duration<double,std::milli>(elapsed_time).count();
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// Example completed. See "clblast.h" for status codes (0 -> success).
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printf("Completed SGEMM in %.3lf ms with status %d\n", time_ms, static_cast<int>(status));
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return 0;
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}
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// =================================================================================================
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