99 lines
2.1 KiB
C++
99 lines
2.1 KiB
C++
#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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#ifndef max
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#define max(a,b) (((a) > (b)) ? (a) : (b))
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#endif
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#ifndef min
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#define min(a,b) (((a) < (b)) ? (a) : (b))
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#endif
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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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struct threadinfo
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{
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int NumofThread;
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int idx;
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};
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int portion;
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static void* mat_mul_thread(void *data) {
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// TODO: parallelize & optimize matrix multiplication
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threadinfo *thInfo=(threadinfo*)data;
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//printf("%s %d %d %d created \n",__func__,__LINE__,thInfo->NumofThread,thInfo->idx);
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int totalthread=thInfo->NumofThread;
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int idx=thInfo->idx;
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int pid = thInfo->idx;
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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 = 32;
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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) {//blocking
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// for(int k=0; k<K;++k){
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Aik = A[i * K + k];
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// for (int j = jj; j < min(jj + bs, N); ++j) {//blocking
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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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}
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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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// TODO: create '_num_threads' pthreads
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num_threads = _num_threads;
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threadinfo *thInfo[81];//thread structure;
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for(int i=0;i<num_threads;i++)
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{
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thInfo[i]= (threadinfo *)malloc(sizeof(threadinfo));
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thInfo[i]->NumofThread = num_threads;
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}
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pthread_t thread[81];
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if(M % num_threads==0)
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{
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portion=M/num_threads;
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}
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else{
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portion=M/num_threads+1;
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}
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for(int i=0;i<num_threads;i++)
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{
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thInfo[i]->idx =i;
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pthread_create(&thread[i], NULL, mat_mul_thread, (void *)thInfo[i]);
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}
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for(int i=0;i<num_threads;i++)
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pthread_join(thread[i], NULL);
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for(int i=0;i<num_threads;i++)
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free(thInfo[i]);
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}
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