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

[Mark Adams]

On Fri, May 29, 2015 at 3:56 PM, Jed Brown <jed at jedbrown.org> wrote:

> 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.
>

This is on Edison and this was not a problem a few months ago.  Edison
could have changed however.
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