88 lines
2.0 KiB
C++
88 lines
2.0 KiB
C++
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#include "mat_mul.h"
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#include <cstdlib>
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#include <cstdio>
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#include <pthread.h>
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#include <algorithm>
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#define bsize 64
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static float *A, *B, *C;
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static int M, N, K;
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static int num_threads;
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static void* mat_mul_thread(void *data) {
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// TODO: parallelize & optimize matrix multiplication
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/* for (int i = 0; i < M; ++i) {
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for (int j = 0; j < N; ++j) {
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for (int k = 0; k < K; ++k) {
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C[i * N + j] += A[i * K + k] * B[k * N + j];
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}
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}
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}
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*/
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int pid = *(int*)data;
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int block = M / num_threads;
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int start = pid*block;
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int end = (pid == num_threads-1)? M: (pid+1)*block;
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float Mat_A;
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for (int kk=0; kk<K; kk+=bsize){
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for(int i=start; i<end; ++i){
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for(int k =kk; k<std::min(kk+bsize, K); ++k){
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Mat_A = A[i*K + k];
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for(int j= 0; j<N; ++j){
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C[i*N+j] += Mat_A * B[k*N+j];
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}
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}
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}
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}
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return NULL;
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}
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void mat_mul(float *_A, float *_B, float *_C, int _M, int _N, int _K, int _num_threads) {
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A = _A, B = _B, C = _C;
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M = _M, N = _N, K = _K;
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num_threads = _num_threads;
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// TODO: create '_num_threads' pthreads
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//pthread_t thread;
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//pthread_create(&thread, NULL, mat_mul_thread, NULL);
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//pthread_join(thread, NULL);
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/*
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pthread_t p_thread[num_threads];
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int thread_id[num_threads];
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int result[num_threads];
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//int status;
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for (int i=0; i<num_threads; i++){
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thread_id[i] = pthread_create(&p_thread[i], NULL, mat_mul_thread, NULL);
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if(thread_id[i]<0){
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perror("thread create error : ");
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exit(0);
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}
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else{
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printf("thread %d : created\n", i);
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}
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}
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for(int j=0; j<num_threads; j++){
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pthread_join(p_thread[j], (void **)&result[j]);
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printf("thread join : %d\n", j);
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}
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*/
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pthread_t *threads;
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threads = (pthread_t*) malloc(sizeof(pthread_t) *num_threads);
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for (int i=0; i< num_threads; i++){
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int *pid = (int*)malloc(sizeof(int));
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*pid = i;
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pthread_create(&threads[i], NULL, mat_mul_thread, pid);
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}
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for (int i=0; i<num_threads;i++){
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pthread_join(threads[i], NULL);
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}
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}
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