[petsc-users] On PCFIELDSPLIT and its implementation

[Edoardo alinovi]

Please ignore me, I was just making a mistake with the number of zeros,
with JEd's suggestion to use MatXAIJSetPreallocation I can do a very
bespoke code and everything looks good.

I'll test the field splitting a bit to see if I can find some performance!

Cheers
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