[petsc-dev] Nested XML logging and stages

Smith, Barry F. bsmith at mcs.anl.gov
Mon May 14 15:51:15 CDT 2018

  I am fine with the suggested changes. 

> On May 13, 2018, at 1:06 PM, Lisandro Dalcin <dalcinl at gmail.com> wrote:
> It took me a while to figure out why my xml -log_view was empty. Nested XML
> logging and push/pop user-defined stages simply does not work, the
> implementation cannot cope with this usage pattern.
> Would it be OK to at ignore push/pop stages if XML is on, and then log
> everything in the main stage, to at least get an non-empty xml log file? I
> guess this would require a private global flag.
> Now that I am on it, could we add a command line option to set the XML
> logging threshold? I would like to pass -log_threshold 0 to get everything,
> but surprisingly "0" is not a good value, NaNs are generated. So I guess we
> need something like PetscMax(threshold,1e-10).
> Why PetscLogView_Nested() calls PetscLogNestedEnd() ? While convenient and
> quick to implement, it smells like bad API usage.

  I don't see a nice alternative.


> -- 
> Lisandro Dalcin
> ============
> Research Scientist
> Computer, Electrical and Mathematical Sciences & Engineering (CEMSE)
> Extreme Computing Research Center (ECRC)
> King Abdullah University of Science and Technology (KAUST)
> http://ecrc.kaust.edu.sa/
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