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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