[petsc-users] log_summary MPI

[Matthew Knepley]

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
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