[petsc-users] Help with mpiexec

[Jed Brown]

On Sat, Oct 13, 2012 at 3:53 PM, George Mathew <gmnnus at gmail.com> wrote:

> On Sat, Oct 13, 2012 at 3:19 PM, Matthew Knepley <knepley at gmail.com<https://lists.mcs.anl.gov/mailman/listinfo/petsc-users>>
> wrote:
>
> >* On Sat, Oct 13, 2012 at 3:17 PM, George Mathew <gmnnus at gmail.com <https://lists.mcs.anl.gov/mailman/listinfo/petsc-users>> wrote:*>**>>* I have petsc 3.3 and mpich2 version 1.4.1p1 installed.*>>* When I run the example ex2.c code in the petsc user manual, it runs one*>>* one machine format. But, if I chose to run on multiple nodes, it gives*>>* error.*>>* The example is the file ${PETSC}/src/ksp/ksp/examples/tutorials/ex2.c.*>>* I compiled it and when run using the following command, it works.*>>* mpiexec -f machinefile -n 1 ./ex2*>>* But, if I run it using the command*>>* mpiexec -f machinefile -n 2 ./ex2*>>* I get the following error.*>>**>**>* It is very likely that you are running the code with the wrong mpiexec*>* (from another MPI installation).*>* I cannot tell which MPI you used with configure.log.*>**
> >Can you also try
>
> >1. Run multiple processes on your local machine
>
> >2. Run with -skip_petscrc
>
> I have only one MPI installation. It is under /usr/local/bin. The following command works:
>
> mpiexec -n 4 ./ex2
>
> So, locally, multiple processes must be running fine.
>
> How do I run with -skip_petscrc?
>
>
mpiexec -n 4 -f machinefile ./ex2 -skip_petscrc
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