[ET Trac] [Einstein Toolkit] #495: MPI error from Carpet with QuasiLocalMeasures: "MPI_SUM is not defined for non-intrinsic datatypes"

[Einstein Toolkit]

#495: MPI error from Carpet with QuasiLocalMeasures: "MPI_SUM is not defined for
non-intrinsic datatypes"
--------------------+-------------------------------------------------------
 Reporter:  hinder  |       Owner:  eschnett
     Type:  defect  |      Status:  new     
 Priority:  major   |   Milestone:          
Component:  Carpet  |     Version:          
 Keywords:          |  
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 In the development (Mercurial) version of Carpet, but not the stable (Git)
 version, QuasiLocalMeasures fails with the following error message:

 ...
 INFO (QuasiLocalMeasures):    Landau-Lifshitz angular momentum x:
 0.00000
 INFO (QuasiLocalMeasures):    Landau-Lifshitz angular momentum y:
 0.00000
 INFO (QuasiLocalMeasures):    Landau-Lifshitz angular momentum z:
 0.00000
 [sl-18:26396] *** An error occurred in MPI_Reduce: the reduction operation
 MPI_SUM is not defined for non-intrinsic datatypes
 [sl-18:26396] *** on communicator MPI COMMUNICATOR 3 SPLIT FROM 0
 [sl-18:26396] *** MPI_ERR_OP: invalid reduce operation
 [sl-18:26396] *** MPI_ERRORS_ARE_FATAL (your MPI job will now abort)

 This affects the QuasiLocalMeasures test suite, but was also reported and
 discussed on the ET mailing list:

   http://lists.einsteintoolkit.org/pipermail/users/2011-May/001107.html

 Additional debugging was suggested to try to locate the reason for the
 error.

 (Reporting against Carpet even though it might be a problem in
 QuasiLocalMeasures because it works in the stable Carpet and this will be
 a possible blocker for promoting the development Carpet to stable).

-- 
Ticket URL: <https://trac.einsteintoolkit.org/ticket/495>
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