[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:  new
  Priority:  major        |   Milestone:     
 Component:  Cactus       |     Version:     
Resolution:               |    Keywords:     
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Comment (by rhaas):

 It turns out that removing the "extra" blank line is harder than expected.
 It is the eol from line 1450 of ioascii.cc
 {{{
 1445 for (int d=0; d<outdim; ++d) {
 1446   if ((*it)[d]!=(*ext.end())[d]) break;
 1447   if (not compact_format or ext.shape()[d] > ext.stride()[d]) {
 1448     // In the compact format, don't separate outputs that
 1449     // consist of a single lines only
 1450     os << eol;
 1451   }
 1452 }
 }}}
  which is output with all points that touch the outer edge of the output
 for any component (ie. any one of x = xmax, y = ymax, z = zmax holds).
 Unfortunately this means that it will always trigger for the last point in
 the output region for a component and since the components are already
 process decomposed ones, there is one black line per MPI process. A way
 around would have been to only output a black line once we are at the edge
 of the containing superregion, which unfortunately requires the code to
 compute if this components will be (once we are all done with output) the
 last one output for this superregion. It is also hard to insert the
 separating blank line at the beginning of a each chunk since non blank
 line should be output if only a single line of output will be produced.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1075#comment:8>
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