118 lines
3.1 KiB
C++
118 lines
3.1 KiB
C++
#include "mat_mul.h"
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#include "util.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 <omp.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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#define ITILESIZE (32)
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#define JTILESIZE (2048)
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#define KTILESIZE (32)
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#define FROM_MASTER (1)
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#define FROM_WORKER (2)
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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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static void mat_mul_omp(int rows) {
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omp_set_num_threads(num_threads);
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#pragma omp parallel for
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for (int ii = 0; ii < rows; 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(rows, 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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int row_size, rows;
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int start, end, offset;
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MPI_Status status;
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MPI_Request request;
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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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if (mpi_rank ==0) {
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row_size = M / mpi_world_size;
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for (int node=1; node<mpi_world_size; node++) {
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start = offset = node * row_size;
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end = (node == mpi_world_size-1) ? M : (node+1)*row_size;
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rows = end - start;
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//Non-blocking
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//
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MPI_Isend(&offset, 1, MPI_INT, node, FROM_MASTER, MPI_COMM_WORLD, &request);
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MPI_Isend(&rows, 1, MPI_INT, node, FROM_MASTER, MPI_COMM_WORLD, &request);
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MPI_Isend(&A[offset*K], rows*K, MPI_FLOAT, node, FROM_MASTER, MPI_COMM_WORLD, &request);
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MPI_Isend(B, K*N, MPI_FLOAT, node, FROM_MASTER, MPI_COMM_WORLD, &request);
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}
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rows = row_size;
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mat_mul_omp(rows);
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for (int node=1; node<mpi_world_size; node++) {
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MPI_Recv(&offset, 1, MPI_INT, node, FROM_WORKER, MPI_COMM_WORLD, &status);
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MPI_Recv(&rows, 1, MPI_INT, node, FROM_WORKER, MPI_COMM_WORLD, &status);
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MPI_Recv(&C[offset*N], rows*N, MPI_FLOAT, node, FROM_WORKER, MPI_COMM_WORLD, &status);
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}
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}
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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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/* Receive */
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MPI_Recv(&offset, 1, MPI_INT, 0, FROM_MASTER, MPI_COMM_WORLD, &status);
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MPI_Recv(&rows, 1, MPI_INT, 0, FROM_MASTER, MPI_COMM_WORLD, &status);
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MPI_Recv(A, rows*K, MPI_FLOAT, 0, FROM_MASTER, MPI_COMM_WORLD, &status);
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MPI_Recv(B, K*N, MPI_INT, 0, FROM_MASTER, MPI_COMM_WORLD, &status);
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mat_mul_omp(rows);
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// Send
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MPI_Isend(&offset, 1, MPI_INT, 0, FROM_WORKER, MPI_COMM_WORLD, &request);
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MPI_Isend(&rows, 1, MPI_INT, 0, FROM_WORKER, MPI_COMM_WORLD, &request);
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MPI_Isend(C, rows*N, MPI_FLOAT, 0, FROM_WORKER, MPI_COMM_WORLD, &request);
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}
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}
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