MPI_Comm_spawn has to build an intercommunicator with the child process
that it spawns. Thus, you can not spawn a non-MPI job such as
/bin/hostname, since the parent process waits for some messages from the
child process(es) in order to set up the intercommunicator.
Thanks
Edgar
Prakash Velayutham wrote:
Hello,
Open MPI 1.2.4
I am trying to run a simple C program.
######################################################################################
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include "mpi.h"
void
main(int argc, char **argv)
{
int tag = 0;
int my_rank;
int num_proc;
char message_0[] = "hello slave, i'm your master";
char message_1[50];
char master_data[] = "slaves to work";
int array_of_errcodes[10];
int num;
MPI_Status status;
MPI_Comm inter_comm;
MPI_Info info;
int arr[1];
int rc1;
MPI_Init(&argc, &argv);
MPI_Comm_rank(MPI_COMM_WORLD, &my_rank);
MPI_Comm_size(MPI_COMM_WORLD, &num_proc);
printf("MASTER : spawning a slave ... \n");
rc1 = MPI_Comm_spawn("/bin/hostname", MPI_ARGV_NULL, 1,
MPI_INFO_NULL, 0, MPI_COMM_WORLD, &inter_comm, arr);
MPI_Finalize();
exit(0);
}
######################################################################################
This program hangs as below:
prakash@bmi-xeon1-01:~/thesis/CS/Samples> ./master1
MASTER : spawning a slave ...
bmi-xeon1-01
Any ideas why?
Thanks,
Prakash
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--
Edgar Gabriel
Assistant Professor
Parallel Software Technologies Lab http://pstl.cs.uh.edu
Department of Computer Science University of Houston
Philip G. Hoffman Hall, Room 524 Houston, TX-77204, USA
Tel: +1 (713) 743-3857 Fax: +1 (713) 743-3335
