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/*
* Copyright (C) by Argonne National Laboratory
* See COPYRIGHT in top-level directory
*/
#include "mpi.h"
#include "mpitest.h"
#include <stdlib.h>
#include <stdio.h>
/* Tests Allgather on array of doubles. Same as allgather2 test
* but without MPI_IN_PLACE. */
int main(int argc, char **argv)
{
double *vecout, *invec;
MPI_Comm comm;
int count, minsize = 2;
int i, errs = 0;
int rank, size;
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);
for (count = 1; count < 9000; count = count * 2) {
invec = (double *) malloc(count * sizeof(double));
vecout = (double *) malloc(size * count * sizeof(double));
for (i = 0; i < count; i++) {
invec[i] = rank * count + i;
}
MPI_Allgather(invec, count, MPI_DOUBLE, vecout, count, MPI_DOUBLE, comm);
for (i = 0; i < count * size; i++) {
if (vecout[i] != i) {
errs++;
if (errs < 10) {
fprintf(stderr, "vecout[%d]=%d\n", i, (int) vecout[i]);
}
}
}
free(invec);
free(vecout);
}
MTestFreeComm(&comm);
}
/* Do a zero byte gather */
MPI_Allgather(MPI_IN_PLACE, -1, MPI_DATATYPE_NULL, NULL, 0, MPI_BYTE, MPI_COMM_WORLD);
MTest_Finalize(errs);
return MTestReturnValue(errs);
}
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