chundoong-lab-ta/SamsungDS22/submissions/HW2/cheolkyoo.kim/mat_mul.cpp

92 lines
2.4 KiB
C++

#include "mat_mul.h"
#include <cstdlib>
#include <cstdio>
#include <pthread.h>
static float *A, *B, *C;
static int M, N, K;
static int num_threads;
static void* mat_mul_thread(void *data) {
// TODO: parallelize & optimize matrix multiplication
int pid = * (int *) data;
int slice = M / num_threads;
int start = pid * slice;
int end = pid == num_threads - 1 ? M : (pid + 1) * slice;
float temp;
int bs = 32;
int j;
for (int kk = 0; kk < K; kk += bs) {
for (int i = start; i < end; ++i) {
for (int k = kk; k < (kk + bs > K ? K : kk + bs); ++k) {
temp = A[i * K + k];
for (j = 0; j < ((N / 8) * 8); j += 8)
{
//C[i * N + j] += temp * B[k * N + j];
C[i * N + j + 0] += temp * B[k * N + j + 0];
C[i * N + j + 1] += temp * B[k * N + j + 1];
C[i * N + j + 2] += temp * B[k * N + j + 2];
C[i * N + j + 3] += temp * B[k * N + j + 3];
C[i * N + j + 4] += temp * B[k * N + j + 4];
C[i * N + j + 5] += temp * B[k * N + j + 5];
C[i * N + j + 6] += temp * B[k * N + j + 6];
C[i * N + j + 7] += temp * B[k * N + j + 7];
/*
C[i * N + j + 8] += temp * B[k * N + j + 8];
C[i * N + j + 9] += temp * B[k * N + j + 9];
C[i * N + j + 10] += temp * B[k * N + j + 10];
C[i * N + j + 11] += temp * B[k * N + j + 11];
C[i * N + j + 12] += temp * B[k * N + j + 12];
C[i * N + j + 13] += temp * B[k * N + j + 13];
C[i * N + j + 14] += temp * B[k * N + j + 14];
C[i * N + j + 15] += temp * B[k * N + j + 15];
*/
}
for (; j < N; ++j) {
C[i * N + j] += temp * 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, mat_mul_thread, pid);
}
for (int i = 0; i < num_threads; i++) {
pthread_join(threads[i], NULL);
}
/*
pthread_t thread;
pthread_create(&thread, NULL, mat_mul_thread, NULL);
1pthread_join(thread, NULL);
*/
}