Hi, I created bug 2274 for this issue. http://trac.mpich.org/projects/mpich/ticket/2274 Ken On 06/08/2015 11:04 PM, Roy, Hirak wrote:
Dear MPICH team,
Waiting for your response.
Thanks,
Hirak
*From:*Roy, Hirak *Sent:* Tuesday, June 02, 2015 1:08 PM *To:* [email protected] *Subject:* MPICH issue when running jobs in background
Hi Team,
I am using MPICH 3.0.4.
My top level script invokes a ‘batch script’ in background and then runs my mpi-program using mpiexec.
I run this top-level script in background mode ( please check details later).
It seems once I invoke the mpiexec, my batch-script execution is suspended.
I tried OpenMPI and they do not have the issue.
I have attached 3 files.
1>run.sh : run script to run the top-level program
2>background.sh : invoked from run.sh as a background job. Just prints something on a while loop
3>myprog.c : simple MPI program which just waits on a loop
Compile step : mpicc myprog.c à a.out
#! /bin/bash
./background.sh &
mpiexec -n 1 ./a.out
To reproduce :
*Shell >> ./run.sh &*
*Shell >> jobs*
*[1] + Suspended (tty input) ./run.sh*
Here the background.sh is suspended. However, a.out keeps running.
If I change the script so that mpiexec takes input from /dev/null, then the issue is resolved.
#! /bin/bash
./background.sh &
mpiexec -n 1 ./a.out *< /dev/null*
It seems to be a MPICH specific issue.
Could you please have a look and file a bug for this.
Thanks,
Hirak
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