[petsc-users] log_summary MPI

[Justin Chang]

Matt, thank you for the response. One more question, is there a way to
output only the MPI messages and MPI message lengths? I don't want to print
everything when I do -log_summary, so are there any command line options
that do this? I can't seem to find anything in the manual that discusses
this.

Thanks,

On Fri, Mar 6, 2015 at 9:10 AM, Matthew Knepley <knepley at gmail.com> wrote:

> On Thu, Mar 5, 2015 at 6:12 PM, Justin Chang <jchang27 at uh.edu> wrote:
>
>> Hi all,
>>
>> I apologize if these may be simple questions that could be found
>> somewhere. In the log_summary profiling, I have a few questions about the
>> MPI messages/MPI message lengths metrics:
>>
>> 1) For MPI messages, does the value under Max correspond to the maximum
>> number of messages a single processor passes?
>>
>
> Yes.
>
>
>> 2) What are the units of MPI message lengths? Is it in bytes?
>>
>
> Yes, returned by PetscMPITypeSize().
>
>
>> 3) What does MPI message lengths refer to exactly? Like, does it refer to
>> the max/min/average size per sent/received message or does it refer to the
>> cumulative size that a single processor sends/receives?
>>
>
> Cumulative, see
>
>
> https://bitbucket.org/petsc/petsc/src/d8151eeaff97562eb317e17b7b0cecab16831f69/include/petsclog.h?at=master#cl-343
>
>   Thanks,
>
>      Matt
>
>
>> Thanks
>>
>> --
>> Justin Chang
>> PhD Candidate, Civil Engineering - Computational Sciences
>> University of Houston, Department of Civil and Environmental Engineering
>> Houston, TX 77004
>> (512) 963-3262
>>
>
>
>
> --
> 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
>



-- 
Justin Chang
PhD Candidate, Civil Engineering - Computational Sciences
University of Houston, Department of Civil and Environmental Engineering
Houston, TX 77004
(512) 963-3262
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