[petsc-users] Logging object creation and destruction counts

[Matthew Knepley]

On Mon, Nov 20, 2023 at 8:00 AM Wells, David <drwells at email.unc.edu> wrote:

> Hi everyone,
>
> I just upgraded to PETSc 3.20 and read up on the new logging
> infrastructure - its a very nice improvement over the old version.
>
> I have some code which checks that every construction has a corresponding
> destruction via
>
>
> PetscStageLog  stageLog;
> ierr = PetscLogGetStageLog(&stageLog);
> for (int i = 0; i < stageLog->stageInfo->classLog->numClasses; ++i)
>       {
>         if (stageLog->stageInfo->classLog->classInfo[i].destructions !=
>             stageLog->stageInfo->classLog->classInfo[i].creations)
>           {
>             crash();
>           }
>       }
>
>
> This no longer works and I can't figure out how to port it. In particular,
> it looks like I need to get a PetscLogEvent number for creation and another
> for destruction to retrieve the relevant PetscEventPerfInfo objects
> per-class - is there some straightforward way to do that for every
> registered PETSc class?
>

1. The above code seems to require that creation and destruction occur
within the same stage, which might not be true.

2. https://petsc.org/main/manualpages/Profiling/PetscLogStateGetNumClasses/
gets the numbet of classes. You can recreate this loop with the code
from PetscLogHandlerObjectCreate_Default() I think,
which is in logdefault.c. However, as I said, this will not properly match
up across stages.

3. At logdefault.c:1657 we output all the creations and destructions, so
you could copy these loops, but sum across stages.

4. You could register a callback that just increments and decrements for
each classid, and then calls PetscLogHandlerObjectCreate/Destroy_Default(),
which might be cleaner.

  Thanks,

     Matt


> Best,
> David Wells
>


-- 
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

https://www.cse.buffalo.edu/~knepley/ <http://www.cse.buffalo.edu/~knepley/>
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