116 lines
3.2 KiB
C++
116 lines
3.2 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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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 int min(int x, int y) {
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return x < y ? x : y;
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}
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MPI_Request request;
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MPI_Status status;
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#define ITILESIZE (32)
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#define JTILESIZE (1024)
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#define KTILESIZE (1024)
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//static void mat_mul_omp(int rows) {
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static void mat_mul_omp() {
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//
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// TODO: parallelize & optimize matrix multiplication
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// Use num_threads per node
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# pragma omp parallel for num_threads(num_threads)
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for (int ii = 0; ii < M; ii += ITILESIZE) {
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for (int jj = 0; jj < N; jj += JTILESIZE) {
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for (int kk = 0; kk < K; kk += KTILESIZE) {
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for (int k = kk; k < min(K, kk + KTILESIZE); k++) {
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for (int i = ii; i < min(M, ii + ITILESIZE); i++) {
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float ar = A[i * K + k];
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for (int j = jj; j < min(N, jj + JTILESIZE); j+=1) {
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C[i * N + j] += ar * B[k * N + j];
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}
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}
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}
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}
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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, mpi_rank = _mpi_rank,
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mpi_world_size = _mpi_world_size;
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// TODO: parallelize & optimize matrix multiplication on multi-node
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// You must allocate & initialize A, B, C for non-root processes
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// FIXME: for now, only root process runs the matrix multiplication.
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int ave_row = M / mpi_world_size;
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int extra_row = M % mpi_world_size;
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int offset;
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/* send matrix data to the worker tasks */
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if (mpi_rank == 0) {
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offset = ave_row + extra_row;
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M = offset;
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if(ave_row) {
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for (int node=1; node < mpi_world_size; node++)
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{
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MPI_Isend ( &offset, 1, MPI_INT, node, 1, MPI_COMM_WORLD, &request);
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MPI_Isend ( &A[offset * K], ave_row*K, MPI_FLOAT, node, 1, MPI_COMM_WORLD, &request);
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MPI_Isend ( B, K*N, MPI_FLOAT, node, 1, MPI_COMM_WORLD, &request);
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offset = offset + ave_row;
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}
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}
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mat_mul_omp();
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} else {
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/* Return the result to mater node */
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if(ave_row) {
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alloc_mat ( &A, ave_row, K);
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alloc_mat ( &B, K, N);
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alloc_mat ( &C, ave_row, N);
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zero_mat ( C, ave_row, N);
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MPI_Recv ( &offset, 1, MPI_INT, 0, 1, MPI_COMM_WORLD, &status);
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MPI_Recv ( A, ave_row*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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M = ave_row;
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mat_mul_omp();
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MPI_Isend ( &offset, 1, MPI_INT, 0, 2, MPI_COMM_WORLD, &request);
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MPI_Isend ( C, ave_row*N, MPI_FLOAT, 0, 2, MPI_COMM_WORLD, &request);
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}
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}
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/* wait for results from all worker tasks */
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if (mpi_rank == 0) {
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if(ave_row) {
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for (int i=1; i < mpi_world_size; i++)
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{
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MPI_Recv ( &offset, 1, MPI_INT, i, 2, MPI_COMM_WORLD, &status);
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MPI_Recv ( &C[offset * N],ave_row*N, MPI_FLOAT, i, 2, MPI_COMM_WORLD, &status);
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}
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}
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}
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}
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