Hi Ralph,
Sorry that I did not come back to clean up this request. Actually, it
was a stupid user (my) error. I had not included stdlib.h in my
source. Sorry again and thanks for the effort.
Prakash
On Jan 14, 2008, at 11:12 PM, Jeff Squyres wrote:
Sorry, this mail slipped by me.
The most common reason that I have seen this happen is if you are not
using the TM support in Open MPI to launch the MPI processes on your
allocated nodes.
I do not have a TM system to test with, but I *believe* that TM will
replicate your entire environment (including $PBS_JOBID) out on the
back-end nodes before starting the job.
Are you seeing cases where this is not happening?
More below.
On Jan 5, 2008, at 3:48 AM, Prakash Velayutham wrote:
Hi,
I am trying to start a simple MPI code below using Open MPI 1.2.4 and
Torque 2.2.1.
prakash@bmi-opt2-04:~/thesis/CS/Samples/changejob> cat pbs.c
#include <stdio.h>
#include "mpi.h"
int gdb_var;
void main(argc, argv)
int argc;
char **argv;
{
int rank, size, ret;
gdb_var = 0;
char *jobid;
ret = MPI_Init(&argc, &argv);
if (ret != 0) printf("ERROR with MPI initialization\n");
ret = MPI_Comm_rank(MPI_COMM_WORLD, &rank);
if (ret != 0) printf("ERROR with MPI ranking\n");
ret = MPI_Comm_size(MPI_COMM_WORLD, &size);
if (ret != 0) printf("ERROR with MPI sizes\n");
if (0 == rank) {
printf("Host %d ready to attach\n",rank);
fflush(stdout);
while (0 == gdb_var) sleep(5);
jobid = getenv("PBS_JOBID");
printf("Job id is %s\n", *jobid);
I don't think you should be de-referncing jobid here.
if (!jobid)
error("PBS_JOBID not set in environment. Code must be
run from a\n"
" PBS script, perhaps interactively using \"qsub -I
\"");
}
MPI_Finalize();
}
main() is supposed to return an int. ;-)
prakash@bmi-opt2-04:~/thesis/CS/Samples/changejob> mpiexec -np 4 --
prefix /usr/local/openmpi-1.2.4 ./pbs
prakash@bmi-opt2-04:~/thesis/CS/Samples/changejob>
Hmm. This output doesn't seem to match the code above...?
As shown above, for some reason, PBS_JOBID is not getting set in the
MPI's environment, even though it is available at the shell level.
prakash@bmi-opt2-04:~/thesis/CS/Samples/changejob> echo $PBS_JOBID
18.fructose.cchmc.org
Any ideas why?
Thanks,
Prakash
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Jeff Squyres
Cisco Systems
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