[ET Trac] [Einstein Toolkit] #1884: provide support for multi-model runs in thorn MPI

[Einstein Toolkit]

#1884: provide support for multi-model runs in thorn MPI
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  Reporter:  rhaas                  |       Owner:                     
      Type:  enhancement            |      Status:  review             
  Priority:  minor                  |   Milestone:                     
 Component:  EinsteinToolkit thorn  |     Version:  development version
Resolution:                         |    Keywords:  MPI                
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Comment (by rhaas):

 I am no longer sure.

 For C, the functionality is the identical between this and Carpet I think.
 The code would only collect the functionality on one spot rather than in
 each driver.

 I think for Fortran, however, Carpet's aliased functions won't work since
 there is no way to dereference the returned CCTK_POINTER_TO_CONST. The
 returned pointer is a pointer to the C MPI communicator struct, which (as
 far as I know) does not have to be bit-identical to Fortran's
 MPI_Communicator type (which is  INT).

 Having said all of this, the original usage case I had for this no longer
 exists (I think it had to do with running PUGH under LoadLeveler or
 something similar, I have PUGH/Carpet patches that would make user of this
 code to provide the aliased functions). The implementation of the Reset
 functions is also somewhat ugly.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1884#comment:3>
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