[petsc-dev] new P^1.5 algorithm in VecAssembleBegin?

Jed Brown jed at jedbrown.org
Fri May 29 14:56:18 CDT 2015

Mark Adams <mfadams at lbl.gov> writes:
> Yea, I realized that VecAssembly should see this load imbalance unless it
> had a barrier before its timer.  So I'm not sure what is going on.

Since you don't have any outgoing entries, I think the huge
MPI_Allreduce is expensive.  No surprise.
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