[petsc-dev] PetscLogView vs. -log_summary

[Matthew Knepley]

On Thu, Jun 21, 2012 at 2:08 PM, Blaise Bourdin <bourdin at lsu.edu> wrote:

>
> On Jun 21, 2012, at 2:55 PM, Matthew Knepley wrote:
>
> On Thu, Jun 21, 2012 at 1:11 PM, Blaise Bourdin <bourdin at math.lsu.edu>wrote:
>
>> Hi,
>>
>> PetscLogView does not display the same amount of information as running
>> with -log_summary. In the "summary of stages" section, the former contains
>> only information on the main stage while the later contains much more.
>>
>> Add the following block at the end of src/snes/examples/tutorials/ex1.c,
>> for instance, to see what I mean
>>  PetscViewer viewer;
>>  ierr =
>> PetscViewerASCIIOpen(PETSC_COMM_WORLD,"ex1-log.py",&viewer);CHKERRQ(ierr);
>>  ierr = PetscLogViewPython(viewer);CHKERRQ(ierr);
>>  ierr = PetscViewerDestroy(&viewer);CHKERRQ(ierr);
>>  ierr =
>> PetscViewerASCIIOpen(PETSC_COMM_WORLD,"ex1-log.txt",&viewer);CHKERRQ(ierr);
>>  ierr = PetscLogView(viewer);CHKERRQ(ierr);
>>  ierr = PetscViewerDestroy(&viewer);CHKERRQ(ierr);
>>  ierr =
>> PetscLogPrintDetailed(PETSC_COMM_WORLD,"ex1-logdetailed.txt");CHKERRQ(ierr);
>>
>> Is this a bug or a feature? Is there a way to get the same output as
>> -log_summary in a file, without printing it to stdout?
>
>
> -log_summary just calls PetscLogView(). I am not sure how there could be a
> problem. I will run it. However, can you
> just use
>
>   -log_summary <filename>
>
>
> That works, yes. Is the issue that stages / events need to be activated a
> priori, which is not possible when PetscLogView is only called at the end
> of the program?
>

Crap. If you do not provide -log_summary, you need PetscLogBegin() at the
beginning.

   Matt


> The caveat is that I am assuming that when using log_summary, the log is
> written as part of PetscFinalize, so that if a job is killed by the
> sceduler or the user, there is no way to get an idea of the performances. I
> like to print the log every so often.
>
> Blaise
>
> --
> Department of Mathematics and Center for Computation & Technology
> Louisiana State University, Baton Rouge, LA 70803, USA
> Tel. +1 (225) 578 1612, Fax  +1 (225) 578 4276
> http://www.math.lsu.edu/~bourdin
>
>
>
>
>
>
>
>


-- 
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
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-dev/attachments/20120621/06071ae2/attachment.html>