52 lines
1.1 KiB
C++
52 lines
1.1 KiB
C++
#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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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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int pid = *(int *) data;
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int slice = M / num_threads;
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int start = pid * slice;
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int end = pid == num_threads - 1 ? M : (pid+1)*slice;
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float Aik;
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int bs = 32;
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for (int kk=0; kk<K; kk+=bs) {
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for (int i=start; i<end; ++i) {
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for (int k=kk; k<std::min(kk+bs,K); ++k) {
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Aik = A[i*K + k];
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for (int j=0; j<N; ++j) {
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C[i*N + j] += Aik * 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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pthread_t * thread;
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thread = (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(&thread[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(thread[i], NULL);
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}
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}
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