chundoong-lab-ta/SamsungDS22/submissions/HW4/juwon76.seo/mat_mul.cpp

110 lines
2.7 KiB
C++

#include "mat_mul.h"
#include "omp.h"
#include "util.h"
#include <cstdio>
#include <cstdlib>
#include <mpi.h>
#define MIN(a,b) ((a>b) ? b : a)
#define ITILESIZE (20)
#define JTILESIZE (1024)
#define KTILESIZE (1024)
static float *A, *B, *C;
static int M, N, K;
static int num_threads;
static int mpi_rank, mpi_world_size;
static int rows,offset;
MPI_Status status;
MPI_Request request;
static void mat_mul_omp() {
#pragma omp parallel for
for (int ii = 0; ii < rows; ii += ITILESIZE) {
for (int jj = 0; jj < N; jj += JTILESIZE) {
for (int kk = 0; kk < K; kk += KTILESIZE) {
for (int k = kk; k < MIN(kk + KTILESIZE,K); k++) {
for (int i = ii; i < MIN(ii + ITILESIZE, rows); i++) {
float ar = A[i * K + k];
for (int j = jj; j < MIN(jj + JTILESIZE, N); 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) {
int source,dest,remain;
M = _M, N = _N, K = _K;
num_threads = _num_threads, mpi_rank = _mpi_rank,
mpi_world_size = _mpi_world_size;
omp_set_num_threads(num_threads);
if (mpi_rank == 0) {
/* send matrix data to the worker tasks */
A = _A, B = _B, C = _C;
rows = M/(mpi_world_size);
remain = M%(mpi_world_size);
offset = remain;
for (dest=1; dest < mpi_world_size; dest++)
{
offset = offset + rows;
MPI_Isend(&offset, 1, MPI_INT, dest, 1, MPI_COMM_WORLD, &request);
MPI_Isend(&rows, 1, MPI_INT, dest, 1, MPI_COMM_WORLD, &request);
MPI_Isend(&A[offset*K], rows*K, MPI_FLOAT,dest,1, MPI_COMM_WORLD, &request);
MPI_Isend(B, K*N, MPI_FLOAT, dest, 1, MPI_COMM_WORLD, &request);
}
offset = 0;
rows = offset+rows+remain;
mat_mul_omp();
/* wait for results from all worker tasks */
for (source = 1; source < mpi_world_size; source++)
{
MPI_Recv(&offset, 1, MPI_INT, source, 2, MPI_COMM_WORLD, &status);
MPI_Recv(&rows, 1, MPI_INT, source, 2, MPI_COMM_WORLD, &status);
MPI_Recv(&C[offset*N], rows*N, MPI_FLOAT, source, 2, MPI_COMM_WORLD, &status);
}
}
/*---------------------------- worker----------------------------*/
if (mpi_rank > 0) {
/* Matrix multiplication */
MPI_Recv(&offset, 1, MPI_INT, 0, 1, MPI_COMM_WORLD, &status);
MPI_Recv(&rows, 1, MPI_INT, 0, 1, MPI_COMM_WORLD, &status);
alloc_mat(&A, rows, K);
alloc_mat(&B, K, N);
alloc_mat(&C, rows, N);
zero_mat(C, rows, N);
MPI_Recv(A, rows*K, MPI_FLOAT, 0, 1, MPI_COMM_WORLD, &status);
MPI_Recv(B, K*N, MPI_FLOAT, 0, 1, MPI_COMM_WORLD, &status);
mat_mul_omp();
MPI_Isend(&offset, 1, MPI_INT, 0, 2, MPI_COMM_WORLD, &request);
MPI_Isend(&rows, 1, MPI_INT, 0, 2, MPI_COMM_WORLD, &request);
MPI_Isend(C, rows*N, MPI_FLOAT, 0, 2, MPI_COMM_WORLD, &request);
}
}