chundoong-lab-ta/SamsungDS22/submissions/HW4/c.m.lee/mat_mul.cpp

95 lines
2.6 KiB
C++

#include "mat_mul.h"
#include <cstdio>
#include <cstdlib>
#include <mpi.h>
#include <omp.h>
#include "util.h"
#define MIN(x, y) (((x) < (y)) ? (x) : (y))
static float *A, *B, *C;
static int M, N, K;
static int num_threads;
static int mpi_rank, mpi_world_size;
static MPI_Status status;
#define ITILESIZE (32)
#define JTILESIZE (1024)
#define KTILESIZE (1024)
static void mat_mul_omp() {
#pragma omp parallel for num_threads(20)
for (int ii = 0; ii < M; ii += ITILESIZE) {
for (int jj = 0; jj < N; jj += JTILESIZE) {
for (int kk = 0; kk < K; kk += KTILESIZE) {
for (int k = kk; k < MIN(K, kk + KTILESIZE); k++) {
for (int i = ii; i < MIN(M, ii + ITILESIZE); i++) {
float ar = A[i * K + k];
for (int j = jj; j < MIN(N, jj + JTILESIZE); j++) {
C[i * N + j] += ar * B[k * N + j];
}
}
}
}
}
}
}
void mat_mul(float *_A, float *_B, float *_C, int _M, int _N, int _K,
int _num_threads, int _mpi_rank, int _mpi_world_size) {
A = _A, B = _B, C = _C;
M = _M, N = _N, K = _K;
num_threads = _num_threads, mpi_rank = _mpi_rank,
mpi_world_size = _mpi_world_size;
MPI_Request send_req[16];
if (mpi_rank == 0) {
for (int i = 1; i < mpi_world_size; i++) {
int rows = _M / mpi_world_size;
int start = rows * i;
int end = start + rows;
if (i == mpi_world_size - 1)
end = _M;
M = end - start;
MPI_Isend(&M, 1, MPI_INT, i, 1, MPI_COMM_WORLD, &send_req[i*4]);
MPI_Isend(&A[start * K], M*K, MPI_FLOAT, i, 1, MPI_COMM_WORLD, &send_req[i*4+1]);
MPI_Isend(B, N*K, MPI_FLOAT, i, 1, MPI_COMM_WORLD, &send_req[i*4+2]);
MPI_Isend(&C[start * N], M*N, MPI_FLOAT, i, 1, MPI_COMM_WORLD, &send_req[i*4+3]);
}
if (mpi_world_size > 1)
MPI_Waitall((mpi_world_size - 1)*4, &send_req[4], MPI_STATUSES_IGNORE);
}
if (mpi_rank == 0) {
M = _M / mpi_world_size;
} else {
alloc_mat(&A, M, K);
alloc_mat(&B, N, K);
alloc_mat(&C, M, N);
zero_mat(C, M, N);
MPI_Recv(&M, 1, MPI_INT, 0, 1, MPI_COMM_WORLD, &status);
MPI_Recv(A, M*K, MPI_FLOAT, 0, 1, MPI_COMM_WORLD, &status);
MPI_Recv(B, N*K, MPI_FLOAT, 0, 1, MPI_COMM_WORLD, &status);
MPI_Recv(C, M*N, MPI_FLOAT, 0, 1, MPI_COMM_WORLD, &status);
}
mat_mul_omp();
if (mpi_rank == 0) {
for (int i = 1; i < mpi_world_size; i++) {
int rows = _M / mpi_world_size;
int start = rows * i;
MPI_Recv(&M, 1, MPI_INT, i, 2, MPI_COMM_WORLD, &status);
MPI_Recv(&C[start * N], M*N, MPI_FLOAT, i, 2, MPI_COMM_WORLD, &status);
}
} else {
MPI_Send(&M, 1, MPI_INT, 0, 2, MPI_COMM_WORLD);
MPI_Send(C, M*N, MPI_FLOAT, 0, 2, MPI_COMM_WORLD);
}
}