97 lines
3.1 KiB
C++
97 lines
3.1 KiB
C++
#include "mat_mul.h"
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#include <cstdio>
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#include <cstdlib>
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#include <mpi.h>
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#include "util.h"
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#include <omp.h>
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#define MIN(x, y) (((x) < (y)) ? (x) : (y))
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#define I_BSIZE 32
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#define J_BSIZE 1024
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#define K_BSIZE 1024
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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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static int mpi_rank, mpi_world_size;
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static MPI_Status status;
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static void mat_mul_omp() {
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#pragma omp parallel for num_threads(20) shared(A, B, C)
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for (int ii = 0; ii < M; ii += I_BSIZE)
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for (int jj = 0; jj < N; jj += J_BSIZE)
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for (int kk = 0; kk < K; kk += K_BSIZE)
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for (int k = kk; k < MIN(K, kk + K_BSIZE); k++)
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for (int i = ii; i < MIN(M, ii + I_BSIZE); i++) {
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float tmp = A[i * K + k];
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for (int j = jj; j < MIN(N, jj + J_BSIZE); j++) {
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C[i * N + j] += tmp * B[k * N + j];
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}
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}
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}
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void mat_mul(float *_A, float *_B, float *_C, int _M, int _N, int _K,
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int _num_threads, int _mpi_rank, int _mpi_world_size) {
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A = _A, B = _B, C = _C;
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M = _M, N = _N, K = _K;
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num_threads = _num_threads;
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mpi_rank = _mpi_rank;
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mpi_world_size = _mpi_world_size;
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MPI_Request mpi_req[16];
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// For master node
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if (mpi_rank == 0) {
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for (int i=1; i<mpi_world_size; i++) {
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int rows = _M / mpi_world_size;
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int start = i * rows;
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int end = start + rows;
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// if last node
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if (i == mpi_world_size - 1) {
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end = _M;
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}
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M = end - start;
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MPI_Isend(&M, 1, MPI_INT, i, 1, MPI_COMM_WORLD, &mpi_req[i*4] );
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MPI_Isend(&A[start*K], M * K, MPI_FLOAT, i, 1, MPI_COMM_WORLD, &mpi_req[i*4+1]);
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MPI_Isend(B, K * N, MPI_FLOAT, i, 1, MPI_COMM_WORLD, &mpi_req[i*4+2]);
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// MPI_Isend(&C[start * N],M * N, MPI_FLOAT, i, 1, MPI_COMM_WORLD, &mpi_req[i*4+3]);
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}
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// To block for completion (non-blocking -> blocking)
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// if (mpi_world_size > 1)
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// MPI_Waitall((mpi_world_size - 1)*4, &mpi_req[4], MPI_STATUSES_IGNORE);
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M = _M / mpi_world_size;
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}
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// For slave node
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else {
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alloc_mat(&A, M, K);
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alloc_mat(&B, K, N);
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alloc_mat(&C, M, N);
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zero_mat(C, M, N);
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MPI_Recv(&M, 1, MPI_INT, 0, 1, MPI_COMM_WORLD, &status);
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MPI_Recv(A, M * K, MPI_FLOAT, 0, 1, MPI_COMM_WORLD, &status);
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MPI_Recv(B, K * N, MPI_FLOAT, 0, 1, MPI_COMM_WORLD, &status);
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// MPI_Recv(C, M * N, MPI_FLOAT, 0, 1, MPI_COMM_WORLD, &status);
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}
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mat_mul_omp();
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if (mpi_rank == 0) {
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for (int i=1; i<mpi_world_size; i++) {
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int rows = _M / mpi_world_size;
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int start = i * rows;
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MPI_Recv(&M, 1, MPI_INT, i, 2, MPI_COMM_WORLD, &status);
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MPI_Recv(&C[start * N], M * N, MPI_INT, i, 2, MPI_COMM_WORLD, &status);
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}
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} else {
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MPI_Send(&M, 1, MPI_INT, 0, 2, MPI_COMM_WORLD);
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MPI_Send(C, M * N, MPI_FLOAT, 0, 2, MPI_COMM_WORLD);
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}
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}
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