[ET Trac] [Einstein Toolkit] #1626: CarpetIOASCCI transfers too much data for output

[Einstein Toolkit]

#1626: CarpetIOASCCI transfers too much data for output
---------------------------+------------------------------------------------
 Reporter:  rhaas          |       Owner:  eschnett           
     Type:  defect         |      Status:  new                
 Priority:  minor          |   Milestone:                     
Component:  Carpet         |     Version:  development version
 Keywords:  CarpetIOASCII  |  
---------------------------+------------------------------------------------
 CarpetIOASCII currently transfers all patches from all processes to the io
 process which then discard everything that does not need to be output for
 1d or 2d output. Technical details:

 The commstate loop in line 660 of ioascii.cc
 uses data_ext to call copy_from() on tmpdatas which were also created
 using data_ext.
 data_ext is set to light_boxes[...].exterior while the actual output
 extent is given by ext as returned by GetOutputBBox.

 If I run the attached parfile with "mpirun -n 4 cactus_sim
 ioascii.par", then I get output from only components 0 and 2 but not 1
 and 3 in the x.x.asc file. However, adding some poisoning and debug
 output to ioascii.cc I seem to receive all data from all components
 (patch attached as well) even those of which no data makes it into the
 output file.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1626>
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