In ctrl_pool's pool.py, we have a Comm class that appears to work around an OpenMPI bug. In his review for DM-2983, Matias Carrasco Kind requests that we check whether this is still necessary.
Backport HSC parallelization code
I wasn't aware of this issue, according to this page (taken from the revision and reading Paul's comment there)
this was an issue of OPEN MPI, and given the date I was wondering whether this is not longer an issue in openmpi 1.8.3 ,
so I wasn't sure about this wrapper on the Communicator
extremely old issue, and cleaning up old tickets. Closing. 11/23/2015.