[ET Trac] [Einstein Toolkit] #1075: Test cases with specific number of processes

[Einstein Toolkit]

#1075: Test cases with specific number of processes
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  Reporter:  eschnett     |       Owner:        
      Type:  enhancement  |      Status:  review
  Priority:  major        |   Milestone:        
 Component:  Cactus       |     Version:        
Resolution:               |    Keywords:        
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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]).

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1075#comment:14>
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