[petsc-users] PetscPrintf

[Xiangdong Liang]

On Tue, Dec 13, 2011 at 11:24 AM, Matthew Knepley <knepley at gmail.com> wrote:
> On Tue, Dec 13, 2011 at 10:19 AM, Xiangdong Liang <xdliang at gmail.com> wrote:
>>
>> On Tue, Dec 13, 2011 at 11:14 AM, Matthew Knepley <knepley at gmail.com>
>> wrote:
>> > On Tue, Dec 13, 2011 at 10:13 AM, Xiangdong Liang <xdliang at gmail.com>
>> > wrote:
>> >>
>> >> Hello everyone,
>> >>
>> >> I am using PetscPrintf(PETSC_COMM_WORLD,.....) to print out some
>> >> information. When I run the program on multiple processors, some of
>> >> these calls are printed out multiple times, while other calls are
>> >> printed out once. Should it be printed only once if I use
>> >> PETSC_COMM_WORLD? Thanks.
>> >
>> >
>> > The print is executed only on rank 0 of the communicator provided.
>>
>> I agree. This implies that the message can be printed out at most
>> once. Do you have any hints why I saw the message printed out multiple
>> times? Thanks.
>
>
> Maybe
>
> 1) You have a bug in your code
>
> 2) You ran with the wrong mpiexec, so it just ran 2 copies

You're right. I use the wrong mpiexec. When I compile petsc-dev, I use
download-mpich while the default mpiexec in our system is openmpi. If
I use $PETSC_DIR/bin/petscmpiexec, the problem is fixed. Thanks, Matt
and Satish.

Xiangdong


>
>   Matt
>
>>
>> Xiangdong
>>
>>
>> >
>> >    Matt
>> >
>> >>
>> >>
>> >> Xiangdong
>> >>
>> >> PS. I am using petsc-dev. My code works fine on real petsc-3.1-p8. I
>> >> just switched to complex petsc-dev and see this problem.
>> >
>> >
>> >
>> >
>> > --
>> > 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
>
>
>
>
> --
> 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