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

[Matthew Knepley]

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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