60 lines
1.3 KiB
C++
60 lines
1.3 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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#ifndef BLK_SIZE
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#define BLK_SIZE 48
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#endif
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#define MIN(x, y) (((x) < (y)) ? (x) : (y))
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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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long id = *((long *)data);
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long chunk = M / num_threads;
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long start = chunk * id;
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long end = start + chunk;
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if (id == num_threads - 1)
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end = M;
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for (int kk = 0; kk < K; kk += BLK_SIZE) {
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for (int i = start; i < end; i++) {
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for (int k = kk; k < MIN(kk + BLK_SIZE, K); k++) {
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register float 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 *threads = (pthread_t *)malloc(_num_threads * sizeof(pthread_t));
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long *ids = (long *)malloc(_num_threads * sizeof(long));
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for (int i = 0; i < _num_threads; i++) {
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ids[i] = i;
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pthread_create(&threads[i], NULL, mat_mul_thread, (void *)&ids[i]);
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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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free(ids);
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free(threads);
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}
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