[petsc-dev] adding comm argument to PetscError() and friends

[Aron Ahmadia]

"I was thinking of something like a barrier+probe+cancel (if necessary)."

There are no non-blocking collective communications guaranteed by MPI-2.
 DCMF (which sits beneath MPI on BlueGene) supports something like this, but
for portable code you are SoL.

A
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