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/*
* Copyright (C) 2010. See COPYRIGHT in top-level directory.
*/
/* One-Sided MPI 2-D Strided Accumulate Test
*
* Author: James Dinan <dinan@mcs.anl.gov>
* Date : December, 2010
*
* This code performs N accumulates into a 2d patch of a shared array. The
* array has dimensions [X, Y] and the subarray has dimensions [SUB_X, SUB_Y]
* and begins at index [0, 0]. The input and output buffers are specified
* using an MPI subarray type.
*/
#include <stdio.h>
#include <stdlib.h>
#include <mpi.h>
#define XDIM 1024
#define YDIM 1024
#define SUB_XDIM 512
#define SUB_YDIM 512
#define ITERATIONS 10
int main(int argc, char **argv) {
int i, j, rank, nranks, peer, bufsize, errors;
double *win_buf, *src_buf;
MPI_Win buf_win;
MPI_Init(&argc, &argv);
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
MPI_Comm_size(MPI_COMM_WORLD, &nranks);
bufsize = XDIM * YDIM * sizeof(double);
MPI_Alloc_mem(bufsize, MPI_INFO_NULL, &win_buf);
MPI_Alloc_mem(bufsize, MPI_INFO_NULL, &src_buf);
if (rank == 0)
printf("MPI RMA Strided Accumulate Test:\n");
for (i = 0; i < XDIM*YDIM; i++) {
*(win_buf + i) = 1.0 + rank;
*(src_buf + i) = 1.0 + rank;
}
MPI_Win_create(win_buf, bufsize, 1, MPI_INFO_NULL, MPI_COMM_WORLD, &buf_win);
peer = (rank+1) % nranks;
// Perform ITERATIONS strided accumulate operations
for (i = 0; i < ITERATIONS; i++) {
int ndims = 2;
int src_arr_sizes[2] = { XDIM, YDIM };
int src_arr_subsizes[2] = { SUB_XDIM, SUB_YDIM };
int src_arr_starts[2] = { 0, 0 };
int dst_arr_sizes[2] = { XDIM, YDIM };
int dst_arr_subsizes[2] = { SUB_XDIM, SUB_YDIM };
int dst_arr_starts[2] = { 0, 0 };
MPI_Datatype src_type, dst_type;
MPI_Type_create_subarray(ndims, src_arr_sizes, src_arr_subsizes, src_arr_starts,
MPI_ORDER_C, MPI_DOUBLE, &src_type);
MPI_Type_create_subarray(ndims, dst_arr_sizes, dst_arr_subsizes, dst_arr_starts,
MPI_ORDER_C, MPI_DOUBLE, &dst_type);
MPI_Type_commit(&src_type);
MPI_Type_commit(&dst_type);
MPI_Win_lock(MPI_LOCK_EXCLUSIVE, peer, 0, buf_win);
MPI_Accumulate(src_buf, 1, src_type, peer, 0, 1, dst_type, MPI_SUM, buf_win);
MPI_Win_unlock(peer, buf_win);
MPI_Type_free(&src_type);
MPI_Type_free(&dst_type);
}
MPI_Barrier(MPI_COMM_WORLD);
// Verify that the results are correct
MPI_Win_lock(MPI_LOCK_EXCLUSIVE, rank, 0, buf_win);
errors = 0;
for (i = 0; i < SUB_XDIM; i++) {
for (j = 0; j < SUB_YDIM; j++) {
const double actual = *(win_buf + i + j*XDIM);
const double expected = (1.0 + rank) + (1.0 + ((rank+nranks-1)%nranks)) * (ITERATIONS);
if (actual - expected > 1e-10) {
printf("%d: Data validation failed at [%d, %d] expected=%f actual=%f\n",
rank, j, i, expected, actual);
errors++;
fflush(stdout);
}
}
}
for (i = SUB_XDIM; i < XDIM; i++) {
for (j = 0; j < SUB_YDIM; j++) {
const double actual = *(win_buf + i + j*XDIM);
const double expected = 1.0 + rank;
if (actual - expected > 1e-10) {
printf("%d: Data validation failed at [%d, %d] expected=%f actual=%f\n",
rank, j, i, expected, actual);
errors++;
fflush(stdout);
}
}
}
for (i = 0; i < XDIM; i++) {
for (j = SUB_YDIM; j < YDIM; j++) {
const double actual = *(win_buf + i + j*XDIM);
const double expected = 1.0 + rank;
if (actual - expected > 1e-10) {
printf("%d: Data validation failed at [%d, %d] expected=%f actual=%f\n",
rank, j, i, expected, actual);
errors++;
fflush(stdout);
}
}
}
MPI_Win_unlock(rank, buf_win);
MPI_Win_free(&buf_win);
MPI_Free_mem(win_buf);
MPI_Free_mem(src_buf);
MPI_Finalize();
if (errors == 0) {
printf("%d: Success\n", rank);
return 0;
} else {
printf("%d: Fail\n", rank);
return 1;
}
}
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