46 lines
1.0 KiB
C++
46 lines
1.0 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 blk = 45;
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for(int kk=0; kk<K; kk+=blk)
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for(int i=pid*M/num_threads; i<(pid+1)*M/num_threads; ++i)
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for(int k=kk; k<std::min(kk+blk, K); ++k){
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for(int j=0; j<N; ++j){
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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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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* 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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