[petsc-dev] [petsc-users] MatTransposeMatMult ends up with an MPI error

[Jed Brown]

This is why I'm writing a non-one-sided implementation of PetscSF (and that
will become the default).

It will likely be faster even on MPICH due to the way one-sided is actually
implemented.

The only work-around for MatTranspose is to fall back to the old code that
didn't preallocate correctly and was much slower.

On Wed, Oct 17, 2012 at 4:57 PM, Barry Smith <bsmith at mcs.anl.gov> wrote:

> I agree but if you start using SF in "normal" parts of PETSc OpenMPI is
> constantly going to cause these emails and that annoys both users and us;
> better to just turn off one-sided for OpenMPI and you can have configure
> report that in a nice box if you like.
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