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/*
* Copyright (C) by Argonne National Laboratory
* See COPYRIGHT in top-level directory
*/
#include <stdio.h>
#include <stdlib.h>
#include <mpi.h>
#include "mpitest.h"
/*
* Check return values of MPI_Win_allocate_shared with MPI_PROC_NULL.
* It should return the first non-zero window segments on the node.
* In this test, rank 0 allocates zero window and others allocate non-zero.
* Thus, it should return the segment belonging to rank 1.
*/
int main(int argc, char **argv)
{
int rank, errors = 0;
int shm_rank, shm_nproc;
MPI_Aint size, query_size;
int *query_base, *my_base;
int query_disp_unit;
MPI_Win shm_win;
MPI_Comm shm_comm;
MTest_Init(&argc, &argv);
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
MPI_Comm_split_type(MPI_COMM_WORLD, MPI_COMM_TYPE_SHARED, rank, MPI_INFO_NULL, &shm_comm);
MPI_Comm_rank(shm_comm, &shm_rank);
MPI_Comm_size(shm_comm, &shm_nproc);
/* Only single process is on the node or the platform does not support shared memory.
* Just wait for others' completion*/
if (shm_nproc < 2)
goto exit;
size = sizeof(int) * 4;
/* Allocate zero-byte window on rank 0 and non-zero for others */
if (shm_rank == 0) {
MPI_Win_allocate_shared(0, sizeof(int), MPI_INFO_NULL, shm_comm, &my_base, &shm_win);
} else {
MPI_Win_allocate_shared(size, sizeof(int), MPI_INFO_NULL, shm_comm, &my_base, &shm_win);
}
/* Query the segment belonging the lowest rank with size > 0 */
MPI_Win_shared_query(shm_win, MPI_PROC_NULL, &query_size, &query_disp_unit, &query_base);
MTestPrintfMsg(1, "%d -- shared query with PROC_NULL: base %p, size %ld, unit %d\n",
shm_rank, query_base, query_size, query_disp_unit);
if (query_base == NULL) {
fprintf(stderr, "%d -- shared query with PROC_NULL: base %p, expected non-NULL pointer\n",
shm_rank, query_base);
fflush(stderr);
errors++;
}
if (query_size != size) {
fprintf(stderr, "%d -- shared query with PROC_NULL: size %ld, expected %ld\n",
shm_rank, query_size, size);
fflush(stderr);
errors++;
}
if (query_disp_unit != sizeof(int)) {
fprintf(stderr, "%d -- shared query with PROC_NULL: disp_unit %d, expected %ld\n",
shm_rank, query_disp_unit, sizeof(int));
fflush(stderr);
errors++;
}
MPI_Win_free(&shm_win);
exit:
MPI_Comm_free(&shm_comm);
MTest_Finalize(errors);
return MTestReturnValue(errors);
}
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