[petsc-dev] New implementation of PtAP based on all-at-once algorithm

Mark Adams mfadams at lbl.gov
Mon Apr 15 14:42:14 CDT 2019

>> I wonder if the their symbolic setup is getting called every time. You do
>> 50 solves it looks like and that should be enough to amortize a one time
>> setup cost.
> Hypre does not have concept called symbolic. They do everything from
> scratch, and won't reuse any data.

Really, Hypre does not cache the maps and non-zero structure, etc, that is
generated in RAP?

I suspect that that is contributing to Hypres poor performance, but it is
not the whole story as you are only doing 5 solves.
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