Where do reductions get handled for multipatch engines?

[Richard Guenther]

Hi!

I'd like to explore the way pooma handles reductions for multipatch
engines, especially for remote ones using cheetah with MPI. I suspect we
do neither use MPI reductions, nor doing something equivalent ourselves.
The reason I believe this is that I see O(n) scaling with the number of
nodes used rather than O(log(n)). So a project would be to teach pooma to
use reduction operations from the parallelization engine where available -
but I'm currently stuck in finding the places to add such code.

Can anyone give me some hints where to look? Anybody tried to do something
similar already?

Thanks, Richard.

--
Richard Guenther <richard.guenther at uni-tuebingen.de>
WWW: http://www.tat.physik.uni-tuebingen.de/~rguenth/
The GLAME Project: http://www.glame.de/