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/*
* Copyright (C) by Argonne National Laboratory
* See COPYRIGHT in top-level directory
*/
/* Test from Edric Ellis
To launch,
Run multiple copies of "testconnect" should be run something like this:
Path/to/testconnect /full/path/to/shared/file N
where each instance has one process and N instances are run
*/
#include "mpi.h"
#include <stdio.h>
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>
#include <assert.h>
char *fname;
int cachedRank = -1;
MPI_Comm comm;
void term_handler(int);
void segv_handler(int);
void term_handler(int sig)
{
if (sig) {
printf("Saw signal %d\n", sig);
}
printf("removing file: %s\n", fname);
fflush(stdout);
unlink(fname);
if (sig != 0) {
MPI_Abort(comm, 42);
exit(0);
}
}
void segv_handler(int sig)
{
printf("SEGV detected!\n");
fflush(stdout);
}
int main(int argc, char **argv)
{
MPI_Comm tmp;
int size = 0;
char portName[MPI_MAX_PORT_NAME];
char *port = &portName[0];
int doPrint = 1;
int totalSize = 0;
int myNum = -1;
FILE *fh;
if (argc < 4) {
printf("Please call with a filename for the port\n");
exit(1);
}
fname = argv[1];
totalSize = atoi(argv[2]);
if (argv[3])
myNum = atoi(argv[3]);
printf("[%d] Waiting for: %d\n", myNum, totalSize);
MPI_Init(0, 0);
/* the existence of the file is used to decide which processes
* first do a connect to the root process. */
fh = fopen(fname, "rt");
if (fh == NULL) {
fh = fopen(fname, "wt");
MPI_Open_port(MPI_INFO_NULL, portName);
port = portName;
fprintf(fh, "%s\n", portName);
fclose(fh);
if (doPrint) {
printf("[%d] Wrote port %s to %s\n", myNum, port, fname);
fflush(stdout);
}
comm = MPI_COMM_WORLD;
} else {
char *s = fgets(port, MPI_MAX_PORT_NAME, fh);
assert(s != NULL);
fclose(fh);
if (doPrint) {
printf("[%d] about to connect: Port from %s is: %s\n", myNum, fname, port);
fflush(stdout);
}
MPI_Comm_connect(port, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &tmp);
if (doPrint) {
printf("[%d] connect-side: about to perform intercomm merge\n", myNum);
fflush(stdout);
}
MPI_Intercomm_merge(tmp, 1, &comm);
if (doPrint) {
printf("[%d] connect-side: intercomm merge complete\n", myNum);
fflush(stdout);
}
MPI_Comm_free(&tmp);
}
MPI_Comm_size(comm, &size);
while (size < totalSize) {
MPI_Comm_accept(port, MPI_INFO_NULL, 0, comm, &tmp);
if (doPrint) {
printf("[%d] accept-side: about to perform intercomm merge\n", myNum);
fflush(stdout);
}
MPI_Intercomm_merge(tmp, 0, &comm);
if (doPrint) {
printf("[%d] accept-side: about to perform intercomm merge\n", myNum);
fflush(stdout);
}
MPI_Comm_rank(comm, &cachedRank);
MPI_Comm_free(&tmp);
MPI_Comm_size(comm, &size);
if (doPrint) {
printf("[%d] Size of comm is %d\n", myNum, size);
fflush(stdout);
}
}
printf("[%d] All done.\n", myNum);
fflush(stdout);
term_handler(0);
MPI_Finalize();
return 0;
}
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