[Yt-svn] [yt] #270: Derived Quantities should not use _mpi_catlist

[yt]

#270: Derived Quantities should not use _mpi_catlist
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 Reporter:  mturk    |       Owner:  mturk
     Type:  defect   |      Status:  new  
 Priority:  blocker  |   Milestone:  2.0  
Component:  yt       |     Version:       
 Keywords:           |  
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 Derived Quantities are too slow because they rely on non-collective
 communications mechanisms.  The original implementation of the parallel
 tools required this round-robin approach where everyone took turns talking
 to the root processor; this occurs in _mpi_catlist, but it should no
 longer be necessary to do this.

 Derived Quantities use _mpi_catlist, which should be converted to use
 either non-blocking or collective operations.

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Ticket URL: <http://yt.enzotools.org/ticket/270>
yt <http://yt.enzotools.org/>
AMR (enzo-specific) data analysis tool