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/*
* Copyright (C) by Argonne National Laboratory
* See COPYRIGHT in top-level directory
*/
#include "mpi.h"
#include "mpitest.h"
#include <stdio.h>
#include <stdlib.h>
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#define IF_VERBOSE(a) if (verbose) { printf a ; fflush(stdout); }
#define DATA_VALUE 123
#define DATA_TAG 100
#define SENDER_RANK 1
#define RECEIVER_RANK 2
/*
static char MTEST_Descrip[] = "A simple test of Comm_disconnect";
*/
int main(int argc, char *argv[])
{
int errs = 0;
int rank, size, rsize, i, data = -1;
int np = 3;
MPI_Comm parentcomm, intercomm;
MPI_Status status;
int verbose = 0;
char *env;
int can_spawn;
env = getenv("MPITEST_VERBOSE");
if (env) {
if (*env != '0')
verbose = 1;
}
MTest_Init(&argc, &argv);
errs += MTestSpawnPossible(&can_spawn);
if (can_spawn) {
MPI_Comm_get_parent(&parentcomm);
if (parentcomm == MPI_COMM_NULL) {
IF_VERBOSE(("spawning %d processes\n", np));
/* Create 3 more processes */
MPI_Comm_spawn((char *) "./disconnect3", MPI_ARGV_NULL, np,
MPI_INFO_NULL, 0, MPI_COMM_WORLD, &intercomm, MPI_ERRCODES_IGNORE);
} else {
intercomm = parentcomm;
}
/* We now have a valid intercomm */
MPI_Comm_remote_size(intercomm, &rsize);
MPI_Comm_size(intercomm, &size);
MPI_Comm_rank(intercomm, &rank);
if (parentcomm == MPI_COMM_NULL) {
IF_VERBOSE(("parent rank %d alive.\n", rank));
/* Parent */
if (rsize != np) {
errs++;
printf("Did not create %d processes (got %d)\n", np, rsize);
fflush(stdout);
}
if (rank == SENDER_RANK) {
IF_VERBOSE(("sending int\n"));
i = DATA_VALUE;
MPI_Send(&i, 1, MPI_INT, RECEIVER_RANK, DATA_TAG, intercomm);
MPI_Recv(&data, 1, MPI_INT, RECEIVER_RANK, DATA_TAG, intercomm, &status);
if (data != i) {
errs++;
}
}
IF_VERBOSE(("disconnecting child communicator\n"));
MPI_Comm_disconnect(&intercomm);
/* Errors cannot be sent back to the parent because there is no
* communicator connected to the children
* for (i=0; i<rsize; i++)
* {
* MPI_Recv(&err, 1, MPI_INT, i, 1, intercomm, MPI_STATUS_IGNORE);
* errs += err;
* }
*/
} else {
IF_VERBOSE(("child rank %d alive.\n", rank));
/* Child */
if (size != np) {
errs++;
printf("(Child) Did not create %d processes (got %d)\n", np, size);
fflush(stdout);
}
if (rank == RECEIVER_RANK) {
IF_VERBOSE(("receiving int\n"));
i = -1;
MPI_Recv(&i, 1, MPI_INT, SENDER_RANK, DATA_TAG, intercomm, &status);
if (i != DATA_VALUE) {
errs++;
printf("expected %d but received %d\n", DATA_VALUE, i);
fflush(stdout);
MPI_Abort(intercomm, 1);
}
MPI_Send(&i, 1, MPI_INT, SENDER_RANK, DATA_TAG, intercomm);
}
IF_VERBOSE(("disconnecting communicator\n"));
MPI_Comm_disconnect(&intercomm);
/* Send the errs back to the parent process */
/* Errors cannot be sent back to the parent because there is no
* communicator connected to the parent */
/*MPI_Ssend(&errs, 1, MPI_INT, 0, 1, intercomm); */
}
/* Note that the MTest_Finalize get errs only over COMM_WORLD */
/* Note also that both the parent and child will generate "No Errors"
* if both call MTest_Finalize */
if (parentcomm == MPI_COMM_NULL) {
MTest_Finalize(errs);
} else {
MPI_Finalize();
}
} else {
MTest_Finalize(errs);
}
IF_VERBOSE(("calling finalize\n"));
return MTestReturnValue(errs);
}
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