[petsc-users] Help with mpiexec

[George Mathew]

On Sat, Oct 13, 2012 at 5:01 PM, Matthew Knepley <knepley at gmail.com> wrote:

> 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
>

The following command works fine:
mpiexec -f machinefile -n 12 hostname

It displays the hostname from the 4 different machines that I have in the
machinefile. The MPI installation was done from the same tar file on the 4
hosts running identical versions of linux.
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