[petsc-users] large PetscCommDuplicate overhead

[Jed Brown]

Barry Smith <bsmith at mcs.anl.gov> writes:

>    Matt,
>
>     Thanks for this information. It sure looks like there is something
>     seriously wrong with the MPI_Attr_get() on the cray for non-root
>     process. Does any PETSc developer have access to such a machine?

Yes, we have a NERSC allocation for Hierarchical Solvers.  Satish's
account is active.  You have a dormant account that I added to the
allocation.

>     We need to write a test program that just calls MPI_Attr_get a
>     bunch of times (no PETSc) to see if we can reproduce the problem
>     and report it to Cray.
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