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/*
* Copyright (C) by Argonne National Laboratory
* See COPYRIGHT in top-level directory
*/
/*
* This program tests MPI_Aint_add/diff in MPI-3.1.
* The two functions are often used in RMA code.
* See https://svn.mpi-forum.org/trac/mpi-forum-web/ticket/349
*/
#include <stdio.h>
#include <mpi.h>
#include "mpitest.h"
int main(int argc, char **argv)
{
int rank, nproc;
int errs = 0;
int array[1024];
int val = 0;
int target_rank = 0; /* suppress warnings */
MPI_Aint bases[2];
MPI_Aint disp, offset = 0; /* suppress warnings */
MPI_Win win;
MTest_Init(&argc, &argv);
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
MPI_Comm_size(MPI_COMM_WORLD, &nproc);
if (rank == 0 && nproc != 2) {
MTestError("Must run with 2 ranks\n");
}
/* Get the base address in the middle of the array */
if (rank == 0) {
target_rank = 1;
array[0] = 1234;
MPI_Get_address(&array[512], &bases[0]);
} else if (rank == 1) {
target_rank = 0;
array[1023] = 1234;
MPI_Get_address(&array[512], &bases[1]);
}
/* Exchange bases */
MPI_Allgather(MPI_IN_PLACE, 0, MPI_DATATYPE_NULL, bases, 1, MPI_AINT, MPI_COMM_WORLD);
MPI_Info info = MPI_INFO_NULL;
#ifdef USE_INFO_COLL_ATTACH
MPI_Info_create(&info);
MPI_Info_set(info, "coll_attach", "true");
#endif
MPI_Win_create_dynamic(info, MPI_COMM_WORLD, &win);
MPI_Win_attach(win, array, sizeof(int) * 1024);
#ifdef USE_INFO_COLL_ATTACH
MPI_Info_free(&info);
#endif
/* Do MPI_Aint addressing arithmetic */
if (rank == 0) {
disp = sizeof(int) * 511;
offset = MPI_Aint_add(bases[1], disp); /* offset points to array[1023] */
} else if (rank == 1) {
disp = sizeof(int) * 512;
offset = MPI_Aint_diff(bases[0], disp); /* offset points to array[0] */
}
/* Get val and verify it */
MPI_Win_fence(MPI_MODE_NOPRECEDE, win);
MPI_Get(&val, 1, MPI_INT, target_rank, offset, 1, MPI_INT, win);
MPI_Win_fence(MPI_MODE_NOSUCCEED, win);
if (val != 1234) {
errs++;
printf("%d -- Got %d, expected 1234\n", rank, val);
}
MPI_Win_detach(win, array);
MPI_Win_free(&win);
MTest_Finalize(errs);
return MTestReturnValue(errs);
}
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