On Thursday 04 February 2010 07:51:58 pm Berk Geveci wrote: > Just a hunch but is there any chance you can try another version of > OpenMPI? Hopefully a newer version? > Sorry, already tried that :) First attempt was with 1.3.2, as supplied by CentOS 5.4, and now all nodes are using 1.4.1. Cheers, -- Bart