99 lines
2.8 KiB
C++
99 lines
2.8 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 <immintrin.h>
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#define MASTER 0
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#define FROM_MASTER 1
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#define FROM_WORKER 2
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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 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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MPI_Request request;
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MPI_Status status;
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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() {
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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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int base = M / mpi_world_size;
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int extra = M % mpi_world_size;
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int offset;
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if (mpi_rank== 0) { //Master
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offset = base + extra;
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M = offset;
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for(int node=1; node < mpi_world_size; node++) {
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MPI_Isend(&offset, 1, MPI_INT, node, FROM_MASTER, MPI_COMM_WORLD, &request);
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MPI_Isend(&A[offset*K], base*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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offset = offset + base;
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}
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mat_mul_omp();
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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(&C[offset*N], base*N, MPI_FLOAT, node, FROM_WORKER, MPI_COMM_WORLD, &status);
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}
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} //if(mpi_rank==0)
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else { //Worker
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alloc_mat(&A, base, K);
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alloc_mat(&B, K, N);
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alloc_mat(&C, base, N);
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zero_mat(C ,base, N);
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MPI_Recv(&offset, 1, MPI_INT, MASTER, FROM_MASTER, MPI_COMM_WORLD ,&status);
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MPI_Recv(A, base*K, MPI_FLOAT, MASTER, FROM_MASTER, MPI_COMM_WORLD, &status);
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MPI_Recv(B, K*N, MPI_FLOAT, MASTER, FROM_MASTER, MPI_COMM_WORLD, &status);
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M = base;
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mat_mul_omp();
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MPI_Isend(&offset, 1, MPI_INT, MASTER, FROM_WORKER, MPI_COMM_WORLD ,&request);
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MPI_Isend(C, base*N, MPI_FLOAT, MASTER ,FROM_WORKER, MPI_COMM_WORLD, &request);
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} //else
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}
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