[petsc-dev] MPI_Init_thread

[Jed Brown]

When threading is used, PETSc should be calling MPI_Init_thread() instead
of MPI_Init(). For our current use case, MPI_THREAD_FUNNELED is the natural
mode to request. As opposed to MPI_THREAD_SINGLE, this causes the MPI
implementation to manage locking around unsafe system calls. Should we just
always ask for FUNNELED?

Do we envision a future time in which we want more threading (e.g.
MPI_THREAD_MULTIPLE)? If so, we would definitely want a way to determine
the desired mode before calling MPI_Init_thread().
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