#1075: Test cases with specific number of processes --------------------------+------------------------------------------------- Reporter: eschnett | Owner: Type: enhancement | Status: review Priority: major | Milestone: Component: Cactus | Version: Resolution: | Keywords: --------------------------+-------------------------------------------------
Comment (by rhaas):
Replying to [comment:13 knarf]:
Does Cactus currently output how many MPI processes have been used for
each test separately? We would need that in order to not get confused about how many processes have in fact been used because with this patch it might be different to what has been specified.
Also, can we have this tested before a commit: Are mpi implementations
going to choke on specifying more processes in mpirun than have been requested using the queue?
The ones using Infiniband usually do in my experience, at least if you were to actually ask for more processes than there are cores on the node. I tried this occasionally when trying to debug something that needed many cores but not much memory on the clusters where you can get an interactive node (ranger,zwicky,kraken [I believe]).