[petsc-users] Issue when calling multiple processors from PETSc

[Ajit Desai]

Thanks for your quick reply Matt.
I was using different MPIexec. The issue is now resolved.

Regards,
Ajit


*Ajit Desai*
*--*
*  PhD Scholar, Carleton University *
*  Ottawa, Canada*

On Thu, Dec 24, 2015 at 11:37 AM, Matthew Knepley <knepley at gmail.com> wrote:

> On Thu, Dec 24, 2015 at 10:16 AM, Ajit Desai <ajit.ndesai at gmail.com>
> wrote:
>
>> Hello everyone,
>>
>> New user of PETSc and trying to get familiar with it for parallel
>> computing applications.
>> I wrote simple hello world code using PETSc environment and found a issue
>> with the output. For instance :
>>
>> When I compile and execute "PETSc_helloWorld.F90" code with multiple
>> processor. It prints following output.
>>
>
> Almost certainly you are using an 'mpiexec' that does not match the MPI
> library that you built PETSc with. Did you
> use --download-mpich? Try this
>
>   cd $PETSC_DIR
>   make check
>
> That will test it with the correct mpiexec.
>
>   Matt
>
>
>> MacUser$ *mpiexec -np 4 ./PETSc_helloWorld*
>>
>> * Hello from PETSc World, rank: 0   of total   1  processes.*
>>
>> * Hello from PETSc World, rank: 0   of total   1  processes.*
>>
>> * Hello from PETSc World, rank: 0   of total   1  processes.*
>>
>> * Hello from PETSc World, rank: 0   of total   1  processes.*
>>
>>
>> Similar code with MPI prints following output:
>>
>> ​MacUser​
>> $
>> *mpiexec -np 4 ./a.out *
>>
>> * Hello from MPI World, rank: 0 *
>> *​  ​*
>> * of total  4  processes.*
>>
>> * Hello from MPI World, rank: 1 *
>> *​  ​*
>> * of total ​  ​4  processes.*
>>
>> * Hello from MPI World, rank: 2 *
>> *​  ​*
>> * of total  4  processes.*
>>
>> * Hello from MPI World, rank: 3   of total  4  processes. *
>>
>> ​I am not sure is this the issue with the PETSc installation ​in my
>> machine or am I missing something here?
>> I have attached both codes and *log_summary* of PETSc for your
>> convenience.
>>
>> Thanks & Regards,
>>
>> *Ajit Desai*
>> *--*
>> *  Carleton University *
>> *  Ottawa, Canada*
>>
>
>
>
> --
> 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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