[petsc-users] Help with mpiexec

[Matthew Knepley]

On Sun, Oct 14, 2012 at 8:00 AM, George Mathew <gmnnus at gmail.com> wrote:

> On Sat, Oct 13, 2012 at 4:55 PM, Jed Brown <jedbrown at mcs.anl.gov> wrote:
>
>> 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
>>
>
> Here is the message when run with skip_petscrc:
>
> $ mpiexec -f machinefile -n 4 ./ex2 -skip_petscrc
> [0]PETSC ERROR: PetscWorldIsSingleHost() line 99 in
> src/sys/utils/pdisplay.c
> [0]PETSC ERROR: PetscSetDisplay() line 125 in src/sys/utils/pdisplay.c
> [0]PETSC ERROR: PetscOptionsCheckInitial_Private() line 319 in
> src/sys/objects/init.c
> [0]PETSC ERROR: PetscInitialize() line 761 in src/sys/objects/pinit.c
> PETSC ERROR: Logging has not been enabled.
> You might have forgotten to call PetscInitialize().
> application called MPI_Abort(MPI_COMM_WORLD, 56) - process 0
>

Can you run any MPI job with that machinefile? Your MPI installations on the
different machines could be incompatible.

   Matt

-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener
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