[petsc-dev] GAMG and custom MatMults in smoothers

[Vaclav Hapla]

Thanks for the MWE. But it behaves exactly as I would anticipate, see log. I think that naming the event differently for each rank is not good but fortunately PETSc just ignores this for rank > 0. Important is the event id which is the same. I correctly get that the time spent in this event is slightly more than 8 s and the ratio between the shortest and the longest time among all ranks is 8.0.

Where's the deadlock? Note that PetscLogEventBegin/End and PetscStageLogPush/Pop are not collective!

And thanks for another argument for better specificity of the log view. If the same event would be nested at several levels, the obtained total time wouldn't say anything useful.

Thanks

Vaclav



> 2. 7. 2018 v 17:20, Stefano Zampini <stefano.zampini at gmail.com>:
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> I don't see why this should lead to deadlock? With current class-wise events you can already have many simultaneous instances of the same event at once.
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> 
> Attached a MVE to better explain myself. If you run with p processes, you will see what I mean
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>  
> 
> -- 
> Stefano
> <log.c>

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