Time to execute KSPSetUp

[jerome ho]

Hi

I wonder if there's any way I can speed up KSPSetUp()?
On larger test cases with 1e8 unknowns, it's taking more than 17 hours (and
still incomplete) to execute this command across 3 processors with
BoomerAMG,
where as the whole setup+solving takes 2 min if the problem size is 1e6.

I've verified that the matrices has completed assembly and I'm using the
non-debugging Petsc version.

Jerome
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