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/*
* Copyright (C) by Argonne National Laboratory
* See COPYRIGHT in top-level directory
*/
#include <stdlib.h>
#include "mpi.h"
#include "mpitest.h"
/* Allgather a two-field struct datatype. This test
may trigger bugs such as when the implementation
does not handle well misaligned types.*/
typedef struct {
int first;
long second;
} int_long_t;
int main(int argc, char **argv)
{
MPI_Comm comm;
int minsize = 2;
int i, errs = 0;
int rank, size;
int_long_t object;
MPI_Datatype type;
MPI_Aint begin;
MPI_Aint displacements[2];
MPI_Datatype types[] = { MPI_INT, MPI_LONG };
int blocklength[2] = { 1, 1 };
int_long_t *gathered_objects;
MTest_Init(&argc, &argv);
while (MTestGetIntracommGeneral(&comm, minsize, 1)) {
if (comm == MPI_COMM_NULL)
continue;
/* Determine the sender and receiver */
MPI_Comm_rank(comm, &rank);
MPI_Comm_size(comm, &size);
gathered_objects = (int_long_t *) malloc(size * sizeof(int_long_t));
/* Local object */
object.first = rank;
object.second = rank * 10;
/* Datatype creation */
MPI_Get_address(&object, &begin);
MPI_Get_address(&object.first, &displacements[0]);
MPI_Get_address(&object.second, &displacements[1]);
for (i = 0; i != 2; ++i)
displacements[i] -= begin;
MPI_Type_create_struct(2, &blocklength[0], &displacements[0], &types[0], &type);
MPI_Type_commit(&type);
MPI_Allgather(&object, 1, type, gathered_objects, 1, type, comm);
for (i = 0; i < size; i++) {
if (gathered_objects[i].first != i || gathered_objects[i].second != i * 10)
errs++;
}
MPI_Type_free(&type);
MTestFreeComm(&comm);
free(gathered_objects);
}
MTest_Finalize(errs);
return MTestReturnValue(errs);
}
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