[ET Trac] [Einstein Toolkit] #995: used shared memory on a node to share EOS table

[Einstein Toolkit]

#995: used shared memory on a node to share EOS table
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  Reporter:  rhaas                  |       Owner:          
      Type:  enhancement            |      Status:  review  
  Priority:  minor                  |   Milestone:          
 Component:  EinsteinToolkit thorn  |     Version:          
Resolution:                         |    Keywords:  EOS_Omni
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Comment (by eschnett):

 doBcast is not defined reliably; it relies on a process id, which may be
 the same on different nodes. Using MPI_Hostname may be a better way.
 Carpet already collects host names and converts them to integers; you may
 be able to query this.

 I don't think it is legal to use different sizes on different processes in
 MPI_Bcase. I would assume that the sender still sends all data, but the
 receiver ignores some of it, and the data remain stuck in a buffer.
 MPI_Alltoallv may be necessary.

 I still worry that the shared memory segments are created in the code, but
 are never deleted. If I recall correctly, the operating system does not
 delete them automatically when a process ends. The command "icps" lists
 all such segments -- please check whether you have a memory leak.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/995#comment:2>
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