chundoong-lab-ta/SamsungDS22/submissions/HW2/jinin.so/mat_mul.cpp

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2022-09-29 18:01:45 +09:00
#include "mat_mul.h"
#include <cstdlib>
#include <cstdio>
#include <pthread.h>
#define BLOCKSIZE 32
#ifndef min
#define min(a,b) (((a) < (b)) ? (a) : (b))
#endif
static float *A, *B, *C;
static int M, N, K;
static int num_threads;
static void* worker(void *data) {
int pid = * (int *) data;
int slice = M / num_threads;
int start = pid * slice;
int end = pid == num_threads - 1 ? M : (pid + 1) * slice;
float Aik;
int bs = BLOCKSIZE;
int ssize;
int j;
/*
for (int kk = 0; kk < K; kk += bs) {
for (int jj = 0; jj < N; jj += bs) {
for (int i = start; i < end; ++i) {
for (int k = kk; k < min(kk + bs, K); ++k) {
Aik = A[i * K + k];
ssize = (min(jj + bs, N)/8)*8;
for (j = jj; j < ssize; j+=8 ) {
C[i * N + j] += Aik * B[k * N + j];
C[i * N + j+1] += Aik * B[k * N + j+1];
C[i * N + j+2] += Aik * B[k * N + j+2];
C[i * N + j+3] += Aik * B[k * N + j+3];
C[i * N + j+4] += Aik * B[k * N + j+4];
C[i * N + j+5] += Aik * B[k * N + j+5];
C[i * N + j+6] += Aik * B[k * N + j+6];
C[i * N + j+7] += Aik * B[k * N + j+7];
}
for(j;j<min(jj + bs, N);j++){
C[i * N + j] += Aik * B[k * N + j];
}
}
}
}
}
*/
for (int kk = 0; kk < K; kk += bs) {
for (int i = start; i < end; ++i) {
for (int k = kk; k < min(kk + bs, K); ++k) {
Aik = A[i * K + k];
ssize = (N/8)*8;
for (j = 0; j < ssize; j+=8 ) {
C[i * N + j] += Aik * B[k * N + j];
C[i * N + j+1] += Aik * B[k * N + j+1];
C[i * N + j+2] += Aik * B[k * N + j+2];
C[i * N + j+3] += Aik * B[k * N + j+3];
C[i * N + j+4] += Aik * B[k * N + j+4];
C[i * N + j+5] += Aik * B[k * N + j+5];
C[i * N + j+6] += Aik * B[k * N + j+6];
C[i * N + j+7] += Aik * B[k * N + j+7];
}
for(j;j<N;j++){
C[i * N + j] += Aik * B[k * N + j];
}
}
}
}
return NULL;
}
void mat_mul(float *_A, float *_B, float *_C, int _M, int _N, int _K, int _num_threads) {
A = _A, B = _B, C = _C;
M = _M, N = _N, K = _K;
num_threads = _num_threads;
// TODO: create '_num_threads' pthreads
pthread_t * threads;
threads = (pthread_t *) malloc(sizeof(pthread_t) * num_threads);
for (int i = 0; i < num_threads; i++) {
int * pid = (int *) malloc(sizeof(int));
*pid = i;
pthread_create(&threads[i], NULL, worker, pid);
}
for (int i = 0; i < num_threads; i++) {
pthread_join(threads[i], NULL);
}
}