[ET Trac] [Einstein Toolkit] #2112: move CCTK_MyHost and friends into flesh

[Einstein Toolkit]

#2112: move CCTK_MyHost and friends into flesh
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  Reporter:  rhaas        |       Owner:                     
      Type:  enhancement  |      Status:  new                
  Priority:  minor        |   Milestone:                     
 Component:  Cactus       |     Version:  development version
Resolution:               |    Keywords:  Carpet PUGH driver 
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Comment (by rhaas):

 @ knarf: the problem with that is that all ranks on the node need to agree
 on the same process ID. I also cannot use the process ID of rank 0 and
 bcast that one, because (being devil's advocate) it could actually be 2
 nodes which are shared among two simulations and one simulation has rank 0
 on node A and the other has rank 0 on node B and those two just happen to
 have the same process ID.

 @ eschett: that will almost always work :-)

 A simpler thing, without the need for any mmap would be basically what you
 are already doing with the processor names but using the (32 bit numeric
 so much easier to work with) {{{gethostid()}}} result. This would avoid
 having to pass around strings through MPI. Again, no mmap needed.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/2112#comment:9>
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