210 lines
6.7 KiB
C++
210 lines
6.7 KiB
C++
#include "mat_mul.h"
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#include <stdio.h>
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#include <CL/cl.h>
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#define CHECK_ERROR(err) \
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if (err != CL_SUCCESS) { \
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printf("[%s:%d] OpenCL error %d\n", __FILE__, __LINE__, err); \
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exit(EXIT_FAILURE); \
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}
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#define TS 32
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#define WPT 8
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#define MAX_NUM_DEVICES 4
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static cl_int err;
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static cl_platform_id platform;
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//static cl_device_id device;
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static cl_device_id devices[MAX_NUM_DEVICES];
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static cl_context context;
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//static cl_command_queue queue;
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static cl_command_queue queues[MAX_NUM_DEVICES];
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static cl_program program;
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//static cl_kernel kernel;
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static cl_kernel kernels[MAX_NUM_DEVICES];
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static cl_mem a_d[MAX_NUM_DEVICES], b_d[MAX_NUM_DEVICES], c_d[MAX_NUM_DEVICES];
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static float *A, *B, *C;
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static int M, N, K;
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static int split_M[MAX_NUM_DEVICES];
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void mat_mul(float *_A, float *_B, float *_C, int _M, int _N, int _K) {
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A = _A, B = _B, C = _C;
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M = _M, N = _N, K = _K;
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// Setup kernel arguments
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for (int i=0; i<MAX_NUM_DEVICES; ++i){
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err = clSetKernelArg(kernels[i], 0, sizeof(cl_mem), &a_d[i]);
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CHECK_ERROR(err);
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err = clSetKernelArg(kernels[i], 1, sizeof(cl_mem), &b_d[i]);
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CHECK_ERROR(err);
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err = clSetKernelArg(kernels[i], 2, sizeof(cl_mem), &c_d[i]);
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CHECK_ERROR(err);
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err = clSetKernelArg(kernels[i], 3, sizeof(int), &split_M[i]);
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CHECK_ERROR(err);
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err = clSetKernelArg(kernels[i], 4, sizeof(int), &N);
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CHECK_ERROR(err);
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err = clSetKernelArg(kernels[i], 5, sizeof(int), &K);
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CHECK_ERROR(err);
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}
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for (int i=0; i<MAX_NUM_DEVICES; ++i){
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// Setup global work size and local work size
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//size_t gws[2] = {(size_t)M, (size_t)N}, lws[2] = {1, 1};
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size_t gws[2] = {(size_t)(split_M[i] + WPT - 1) / WPT, (size_t)N}, lws[2] = {TS / WPT, TS};
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for (int j = 0; j < 2; ++j) {
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// By OpenCL spec, global work size should be MULTIPLE of local work size
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// Formula below achieve it
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// e.g., gws = 25, lws = 16, then (25 + 16 - 1) / 16 * 16 = 40 / 16 * 16 = 2 * 16 = 32
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gws[j] = (gws[j] + lws[j] - 1) / lws[j] * lws[j];
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}
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// Run kernel
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err = clEnqueueNDRangeKernel(queues[i], kernels[i], 2, NULL, gws, lws, 0, NULL, NULL);
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CHECK_ERROR(err);
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}
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// DO NOT REMOVE; NEEDED FOR TIME MEASURE
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for (int i=0; i<MAX_NUM_DEVICES; ++i){
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err = clFinish(queues[i]);
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CHECK_ERROR(err);
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}
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}
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static void print_platform_info(cl_platform_id platform) {
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size_t sz;
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char *buf;
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CHECK_ERROR(clGetPlatformInfo(platform, CL_PLATFORM_NAME, 0, NULL, &sz));
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buf = (char*)malloc(sz);
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CHECK_ERROR(clGetPlatformInfo(platform, CL_PLATFORM_NAME, sz, buf, NULL));
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printf("Detected OpenCL platform: %s\n", buf);
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free(buf);
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}
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static void print_device_info(cl_device_id device) {
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size_t sz;
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char *buf;
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CHECK_ERROR(clGetDeviceInfo(device, CL_DEVICE_NAME, 0, NULL, &sz));
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buf = (char*)malloc(sz);
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CHECK_ERROR(clGetDeviceInfo(device, CL_DEVICE_NAME, sz, buf, NULL));
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printf("Detected OpenCL device: %s\n", buf);
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free(buf);
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}
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static cl_program create_and_build_program_with_source(cl_context context, cl_device_id* device, const char *file_name) {
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FILE *file = fopen(file_name, "rb");
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if (file == NULL) {
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printf("Failed to open %s\n", file_name);
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exit(EXIT_FAILURE);
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}
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fseek(file, 0, SEEK_END);
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size_t source_size = ftell(file);
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rewind(file);
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char *source_code = (char*)malloc(source_size + 1);
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size_t ntotal = 0;
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while (ntotal < source_size) {
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int nread = fread(source_code, sizeof(char), source_size, file);
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ntotal += nread;
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}
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source_code[source_size] = '\0';
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fclose(file);
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cl_program program = clCreateProgramWithSource(context, 1, (const char **)&source_code, &source_size, &err);
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CHECK_ERROR(err);
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free(source_code);
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err = clBuildProgram(program, MAX_NUM_DEVICES, device, "", NULL, NULL);
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if (err == CL_BUILD_PROGRAM_FAILURE) {
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size_t log_size;
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CHECK_ERROR(clGetProgramBuildInfo(program, device[0], CL_PROGRAM_BUILD_LOG, 0, NULL, &log_size));
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char *log = (char*)malloc(log_size + 1);
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CHECK_ERROR(clGetProgramBuildInfo(program, device[0], CL_PROGRAM_BUILD_LOG, log_size, log, NULL));
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log[log_size] = 0;
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printf("Compile error:\n%s\n", log);
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free(log);
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}
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CHECK_ERROR(err);
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return program;
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}
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void mat_mul_init(float *A, float *B, float *C, int M, int N, int K) {
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// Get OpenCL platform
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err = clGetPlatformIDs(1, &platform, NULL);
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CHECK_ERROR(err);
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print_platform_info(platform);
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// Create GPU buffers
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int tmp_split_M = M / MAX_NUM_DEVICES;
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for (int i=0; i<MAX_NUM_DEVICES; ++i){
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split_M[i] = tmp_split_M;
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if (i == MAX_NUM_DEVICES-1) split_M[i] += M % MAX_NUM_DEVICES;
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}
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// Get OpenCL device
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err = clGetDeviceIDs(platform, CL_DEVICE_TYPE_GPU, MAX_NUM_DEVICES, devices, NULL);
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CHECK_ERROR(err);
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for(int i=0; i<MAX_NUM_DEVICES; ++i)
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print_device_info(devices[i]);
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context = clCreateContext(NULL, MAX_NUM_DEVICES, devices, NULL, NULL, &err);
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CHECK_ERROR(err);
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// Create OpenCL command queue
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for(int i=0; i<MAX_NUM_DEVICES; ++i){
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queues[i] = clCreateCommandQueue(context, devices[i], 0, &err);
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CHECK_ERROR(err);
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}
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//queue = queues[0];
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// Compile program from "kernel.cl"
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program = create_and_build_program_with_source(context, devices, "kernel.cl");
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// Extract kernel from compiled program
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for (int i=0; i<MAX_NUM_DEVICES; ++i){
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kernels[i] = clCreateKernel(program, "sgemm", &err);
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CHECK_ERROR(err);
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}
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for (int i=0; i<MAX_NUM_DEVICES; ++i){
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a_d[i] = clCreateBuffer(context, CL_MEM_READ_WRITE, split_M[i] * K * sizeof(float), NULL, &err);
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CHECK_ERROR(err);
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b_d[i] = clCreateBuffer(context, CL_MEM_READ_WRITE, K * N * sizeof(float), NULL, &err);
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CHECK_ERROR(err);
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c_d[i] = clCreateBuffer(context, CL_MEM_READ_WRITE, split_M[i] * N * sizeof(float), NULL, &err);
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CHECK_ERROR(err);
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}
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// Write to GPU; A (cpu) -> a_d (gpu), B (cpu) -> b_d (gpu)
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int offset = 0;
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for (int i=0; i<MAX_NUM_DEVICES; ++i){
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err = clEnqueueWriteBuffer(queues[i], a_d[i], CL_TRUE, 0, split_M[i] * K * sizeof(float), &A[offset], 0, NULL, NULL);
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CHECK_ERROR(err);
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offset += split_M[i] * K;
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err = clEnqueueWriteBuffer(queues[i], b_d[i], CL_TRUE, 0, K * N * sizeof(float), B, 0, NULL, NULL);
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CHECK_ERROR(err);
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}
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// DO NOT REMOVE; NEEDED FOR TIME MEASURE
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for (int i=0; i<MAX_NUM_DEVICES; ++i){
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err = clFinish(queues[i]);
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CHECK_ERROR(err);
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}
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}
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void mat_mul_final(float *A, float *B, float *C, int M, int N, int K) {
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// Read from GPU; c_d (gpu) -> C (cpu)
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int offset = 0;
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for (int i=0; i<MAX_NUM_DEVICES; ++i) {
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err = clEnqueueReadBuffer(queues[i], c_d[i], CL_TRUE, 0, split_M[i] * N * sizeof(float), &C[offset], 0, NULL, NULL);
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CHECK_ERROR(err);
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offset += split_M[i] * N;
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}
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// DO NOT REMOVE; NEEDED FOR TIME MEASURE
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for (int i=0; i<MAX_NUM_DEVICES; ++i){
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err = clFinish(queues[i]);
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CHECK_ERROR(err);
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}
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}
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