[petsc-users] Performance of Fieldsplit PC

[Bernardo Rocha]

OK I see what you mean now.
Thanks a lot for the help, playing with the inner tolerances was the key to
improve the performance of the PCFieldSplit preconditioner.

The only question which still remains is when should one use preonly for
the inner solves.

You could try to play games with the inner tolerances (say run the blocks
> only to 10^-4). However,
> the fact remains that this is not even a credible solver for the problem.
>
>   Thanks,
>
>      Matt
>
> Best regards,
>> Bernardo​
>>
>>
>
>
> --
> 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.caam.rice.edu/~mk51/>
>
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