[petsc-dev] ugly shit

[Kai Germaschewski]

On Thu, Nov 10, 2011 at 8:43 PM, Jed Brown <jedbrown at mcs.anl.gov> wrote:

How do we find out who needs pre-MPI-2.0?


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.

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.

--Kai

-- 
Kai Germaschewski
Assistant Professor, Dept of Physics / Space Science Center
University of New Hampshire, Durham, NH 03824
office: Morse Hall 245E
phone:  +1-603-862-2912
fax: +1-603-862-2771
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