[petsc-dev] PetscLogView vs. -log_summary

[Barry Smith]

On Jun 21, 2012, at 10:46 PM, Matthew Knepley wrote:

> On Thu, Jun 21, 2012 at 4:16 PM, Barry Smith <bsmith at mcs.anl.gov> wrote:
> 
> 
> > 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.
> 
>    Matt,  why is this "Crap"   its completely reasonable that if you want to have logging from program control that you have to turn it on programatically?
> 
> Crap, because I should have remembered earlier.

   FAQ or some other mechanism to "remember this". We can't be relying on our memories :-)

   Actually, why not have PetscLogView() print an error message if PetscLogBegin() was not previously called? Instead of just not have data to display? Then we won't need to remember anything?


   Barry

> 
>    Matt
>  
> > 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
> >
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> > --
> > What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.
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> 
> 
> 
> 
> -- 
> 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