[petsc-users] log_summary MPI

[Justin Chang]

Okay got it, thank you very much

On Fri, Mar 6, 2015 at 1:06 PM, Matthew Knepley <knepley at gmail.com> wrote:

> On Fri, Mar 6, 2015 at 12:56 PM, Justin Chang <jchang27 at uh.edu> wrote:
>
>> 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.
>>
>
> These are just global counters:
>
>
> https://bitbucket.org/petsc/petsc/src/1ddf9febf6a13a173c13b6b0dde02ed9ccfd590e/src/sys/logging/plog.c?at=master#cl-51
>
> You can output them whenever you want. If you want global numbers, you
> will need to call reductions yourself.
>
>   Thanks,
>
>     Matt
>
>
>> 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
>>
>
>
>
> --
> 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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