[petsc-dev] PETSc object management of MPI communicators

[Jed Brown]

Dmitry Karpeyev <karpeev at mcs.anl.gov> writes:

> I'd say that a writeup explaining why the inner comms are needed would be
> useful also for others to understand the peculiarities/shortcomings of the
> MPI model.  

I don't think this is a shortcoming; MPI attributes are perfectly
sufficient for this purpose.  I think Bill had this use case in mind
when arguing for attribute caching in MPI-1.

> You never know who might be contributing to the next successful
> programming model, so don't we want more people to understand MPI?

Yes, that's why I suggested writing a short report explaining Barry and
Bill's reasoning from 20 years ago.  A blog post would be an alternative
medium.
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