92 lines
2.3 KiB
C++
92 lines
2.3 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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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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inline int min(int a, int b) { if(a>b) return b; else return a; }
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pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
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static void* mat_mul_thread(void *data) {
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// TODO: parallelize & optimize matrix multiplication
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static int tid = 0;
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int num;
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pthread_mutex_lock(&lock);
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tid%=num_threads;
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tid++;
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num=tid;
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pthread_mutex_unlock(&lock);
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// printf("start: num = %d\n", num);
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int q, r;
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r = M % num_threads;
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q = M / num_threads;
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// if(num==1){ printf("q = %d, r = %d\n", q, r); }
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if(r){
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q++;
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}
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int i, j, k;
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int kk, off_k;
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int jj, off_j;
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off_k = 64;
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off_j = 1024;
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float A_tmp;
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if(num == num_threads){
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for(jj = 0; jj < N; jj += off_j){
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for(kk = 0; kk < K; kk += off_k){
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for(i = q * (num-1); i < min(q * num + r, M); ++i){
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for(k = kk; k < min(kk+off_k, K); ++k){
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A_tmp = A[i * K + k];
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// #pragma GCC unroll 2
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for(j = jj; j < min(jj+off_j, N); ++j){
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C[i * N + j] += A_tmp * 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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}else{
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for(jj = 0; jj < N; jj += off_j){
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for(kk = 0; kk < K; kk += off_k){
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for(i = q * (num-1); i < min(q * num, M); ++i){
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for(k = kk; k < min(kk+off_k, K); ++k){
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A_tmp = A[i * K + k];
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// #pragma GCC unroll 2
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for(j = jj; j < min(jj+off_j, N); ++j){
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C[i * N + j] += A_tmp * 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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}
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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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int i;
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pthread_t thread[num_threads];
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for(i=0; i<num_threads; i++){
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pthread_create(&thread[i], NULL, mat_mul_thread, NULL);
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}
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for(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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