[ET Trac] [Einstein Toolkit] #798: allow calculations in parameter assignments in parameter files

[Einstein Toolkit]

#798: allow calculations in parameter assignments in parameter files
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  Reporter:  rhaas        |       Owner:        
      Type:  enhancement  |      Status:  review
  Priority:  optional     |   Milestone:        
 Component:  Cactus       |     Version:        
Resolution:               |    Keywords:        
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Comment (by knarf):

 One problem with system() is that this seems to break several MPI
 implementations. We (still) have problems with this on QueenBee (because
 it is so old), and OpenMPI also has / can have problems with system()
 calls: it makes the code hang. I had to switch back from using OpenMPI to
 Mpich2 because of this.

 See
 http://www.open-mpi.org/faq/?category=openfabrics#ofa-fork
 and
 http://www.open-mpi.org/faq/?category=tuning#fork-warning

 The suggested `ompi_info --param btl openib --parsable | grep
 have_fork_support:value | cut -d: -f7`
 does not work for me, as Cactus simulations using openmpi still hang after
 system(), while the same compiled against mpich2 work.

-- 
Ticket URL: <https://trac.einsteintoolkit.org/ticket/798#comment:5>
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