[petsc-dev] Custom reductions

[Jed Brown]

Matthew Knepley <knepley at gmail.com> writes:

> I understood from Jed that MPIU_MIN and friends are for floating point, but
> here
>
>
> https://bitbucket.org/petsc/petsc/src/da407576a5bf29881cba0f2df6c198aa8caa98f0/src/sys/logging/plog.c?at=master#cl-1346
>
> we use MPI_MIN. Is this wrong?

PetscLogDouble is always a basic MPI type; never something cool like __float128.
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