57 lines
1.2 KiB
C++
57 lines
1.2 KiB
C++
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#include "mat_mul.h"
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#include <algorithm>
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#include <cstdlib>
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#include <cstdio>
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#include <pthread.h>
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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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//
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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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for (int kk=0; kk< K; kk+=32){
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for(int i=start; i<end; i++){
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for(int k = kk; k < ((kk+32)<K ? (kk+32):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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// 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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