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 --> 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 _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss