[ET Trac] [Einstein Toolkit] #1706: Make Carpet's ASCII output independent of the number of processors

[Einstein Toolkit]

#1706: Make Carpet's ASCII output independent of the number of processors
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  Reporter:  eschnett     |       Owner:  hinder             
      Type:  enhancement  |      Status:  reviewed_ok        
  Priority:  major        |   Milestone:                     
 Component:  Cactus       |     Version:  development version
Resolution:               |    Keywords:                     
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Changes (by hinder):

  * status:  review => reviewed_ok


Comment:

 I have tested that this allows 1, 2, 4, 6, 10 and 11 process tests to all
 pass with WeylScal4/teukolskyID (after updating to use compact output
 format and to not output ghost zones).  Please merge.

 Is it now guaranteed that the output will be independent of the process
 decomposition, or does this just work because of the specific process
 decomposition that Carpet has chosen, e.g. that higher-numbered components
 will always have higher 1D coordinate values along a line?  Or does
 CarpetIOASCII deliberately output components in increasing order of the
 coordinate?

 I assume that this will not work for 2D or 3D output.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1706#comment:2>
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