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

Mark Adams <[email protected]> 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.