90 lines
2.0 KiB
C++
90 lines
2.0 KiB
C++
#include "mat_mul.h"
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#include <immintrin.h>
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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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#define min(a,b) (((a) < (b)) ? (a) : (b))
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static void* mat_mul_thread(void *data) {
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// TODO: parallelize & optimize matrix multiplication
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//// Naive
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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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// A[M x K]
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// B[K x N]
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// C[M x N]
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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 = 45;
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//for (int kk = 0; kk < K; kk+=bs) {
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//for (int jj = 0; jj < N; jj+=bs) {
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//for (int i = start; i < end; ++i) {
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//for (int k = kk; k < (min(kk+bs, K)); ++k) {
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// Aik = A[i*K + k];
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// for(int j = 0; j<(min(jj+bs, 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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//}
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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 < (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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// TODO: create '_num_threads' pthreads
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printf("\n");
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printf("************ mat_mul ************\n");
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printf("debug: num_threads: %d\n",num_threads);
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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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// pthread_t thread;
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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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// pthread_join(thread, NULL);
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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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