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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); }
/*
static char MTEST_Descrip[] = "A simple test of Comm_connect/accept/disconnect";
*/
int main(int argc, char *argv[])
{
int errs = 0;
int rank, size, rsize, i, j, data, num_loops = 100;
int np = 3;
MPI_Comm parentcomm, intercomm;
MPI_Status status;
char port[MPI_MAX_PORT_NAME] = { 0 };
int verbose = 0;
int do_messages = 1;
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) {
/* FIXME: Document arguments */
if (argc > 1) {
num_loops = atoi(argv[1]);
if (num_loops < 0)
num_loops = 0;
if (num_loops > 100)
num_loops = 100;
}
if (argc > 2) {
do_messages = atoi(argv[2]);
}
MPI_Comm_get_parent(&parentcomm);
if (parentcomm == MPI_COMM_NULL) {
MPI_Comm_rank(MPI_COMM_WORLD, &rank); /* Get rank for verbose msg */
IF_VERBOSE(("[%d] spawning %d processes\n", rank, np));
/* Create 3 more processes */
MPI_Comm_spawn((char *) "./disconnect_reconnect",
/*MPI_ARGV_NULL */ &argv[1], 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(("[%d] parent rank %d alive.\n", rank, rank));
/* Parent */
if (rsize != np) {
errs++;
printf("Did not create %d processes (got %d)\n", np, rsize);
fflush(stdout);
}
if (rank == 0 && num_loops > 0) {
MPI_Open_port(MPI_INFO_NULL, port);
IF_VERBOSE(("[%d] port = %s\n", rank, port));
MPI_Send(port, MPI_MAX_PORT_NAME, MPI_CHAR, 0, 0, intercomm);
}
IF_VERBOSE(("[%d] disconnecting child communicator\n", rank));
MPI_Comm_disconnect(&intercomm);
for (i = 0; i < num_loops; i++) {
IF_VERBOSE(("[%d] accepting connection\n", rank));
MPI_Comm_accept(port, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &intercomm);
MPI_Comm_remote_size(intercomm, &rsize);
if (do_messages && (rank == 0)) {
j = 0;
for (j = 0; j < rsize; j++) {
data = i;
IF_VERBOSE(("[%d]sending int to child process %d\n", rank, j));
MPI_Send(&data, 1, MPI_INT, j, 100, intercomm);
IF_VERBOSE(("[%d] receiving int from child process %d\n", rank, j));
data = i - 1;
MPI_Recv(&data, 1, MPI_INT, j, 100, intercomm, &status);
if (data != i) {
errs++;
}
}
}
IF_VERBOSE(("[%d] disconnecting communicator\n", rank));
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(("[%d] child rank %d alive.\n", rank, rank));
/* Child */
if (size != np) {
errs++;
printf("(Child) Did not create %d processes (got %d)\n", np, size);
fflush(stdout);
}
if (rank == 0 && num_loops > 0) {
IF_VERBOSE(("[%d] receiving port\n", rank));
MPI_Recv(port, MPI_MAX_PORT_NAME, MPI_CHAR, 0, 0, intercomm, &status);
}
IF_VERBOSE(("[%d] disconnecting communicator\n", rank));
MPI_Comm_disconnect(&intercomm);
for (i = 0; i < num_loops; i++) {
IF_VERBOSE(("[%d] connecting to port (loop %d)\n", rank, i));
MPI_Comm_connect(port, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &intercomm);
if (do_messages) {
IF_VERBOSE(("[%d] receiving int from parent process 0\n", rank));
MPI_Recv(&data, 1, MPI_INT, 0, 100, intercomm, &status);
if (data != i) {
printf("expected %d but received %d\n", i, data);
fflush(stdout);
MPI_Abort(MPI_COMM_WORLD, 1);
}
IF_VERBOSE(("[%d] sending int back to parent process 1\n", rank));
MPI_Send(&data, 1, MPI_INT, 0, 100, intercomm);
}
IF_VERBOSE(("[%d] disconnecting communicator\n", rank));
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(("[%d] calling finalize\n", rank));
return MTestReturnValue(errs);
}
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