[petsc-users] How can PETSc configure with MSMPI

Jed Brown jed at jedbrown.org
Sun Feb 2 18:31:17 CST 2014

Danyang Su <danyang.su at gmail.com> writes:

> Hi All,
> MPICH with CYGWIN can work on my box if only --with-mpi

If you --with-mpi=0, then a serial stub implementation is used (not

> or --with-openmp 

This option does nothing on its own (only when combined with threadcomm,
which is experimental and needs some refactoring).  So just don't use
that option.  You can use OpenMP in your code regardless of whether
PETSc is using it internally.  (Most operations in PETSc are limited by
memory bandwidth anyway, so more threads per socket doesn't offer much.)
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