[petsc-dev] ugly shit

[Jed Brown]

On Thu, Nov 10, 2011 at 21:14, Kai Germaschewski
<kai.germaschewski at unh.edu>wrote:

> Just a (kinda arbitrary) data point: I introduced MPI_IN_PLACE in my code
> a year or so ago (not realizing that it requires MPI-2.0 at the time) and
> within a year, I hit two cases of machines that were still running MPI 1.x
> -- and the code doesn't get to run in all that many places in the first
> place.
>

What sort of configurations were these?


>
> Having said that, I think it's generally a good idea to not keep backwards
> compatibility cruft around forever. OTOH, requiring MPI2 just for
> MPI_IN_PLACE isn't a real convincing case, since it's so easy to do the
> same with MPI1.
>

I agree, this is mostly cosmetic, but there are more MPI-2 features that
would also be useful. There are places where having MPI 1-sided would
greatly simplify, for example.
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