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/*
* Copyright (C) by Argonne National Laboratory
* See COPYRIGHT in top-level directory
*/
#include <mpi.h>
#include <stdio.h>
#include <stdlib.h>
#include "mpitest.h"
/* Tests send/receive with large tag values. It mimics the usage of tags in
* some MPI-based libraries (e.g., PETSc). */
#define ITER 5
#define BUF_COUNT (16)
int recvbuf[BUF_COUNT], sendbuf[BUF_COUNT];
int main(int argc, char *argv[])
{
int x, size, rank, errs = 0;
void *tag_ub_val = NULL;
int tag = 0, flag = 0;
MTest_Init(&argc, &argv);
MPI_Comm_size(MPI_COMM_WORLD, &size);
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
/* perform test only with two or more processes */
if (size < 2)
goto exit;
/* query the upper bound of tag value */
MPI_Comm_get_attr(MPI_COMM_WORLD, MPI_TAG_UB, &tag_ub_val, &flag);
tag = *(int *) tag_ub_val;
if (!flag || tag < 32767) {
fprintf(stdout, "%d -- Incorrect MPI_TAG_UB, found flag=%d, tag=%d\n", rank, flag, tag);
fflush(stdout);
errs++;
goto exit;
}
/* send/receive with large tags from the upper bound */
for (x = 0; x < ITER; x++) {
int i;
if (rank == 0) {
/* reset send buffer */
for (i = 0; i < BUF_COUNT; i++)
sendbuf[i] = x * BUF_COUNT + i;
MPI_Send(sendbuf, BUF_COUNT, MPI_INT, 1, tag, MPI_COMM_WORLD);
} else if (rank == 1) {
MPI_Recv(recvbuf, BUF_COUNT, MPI_INT, 0, tag, MPI_COMM_WORLD, MPI_STATUS_IGNORE);
/* check correctness of received data */
for (i = 0; i < BUF_COUNT; i++) {
int expected_val = x * BUF_COUNT + i;
if (recvbuf[i] != expected_val) {
errs++;
fprintf(stdout, "%d -- Received %d at index %d with tag %d, expected %d\n",
rank, recvbuf[i], i, tag, expected_val);
fflush(stdout);
}
}
}
tag--;
}
exit:
MTest_Finalize(errs);
return MTestReturnValue(errs);
}
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