[Beowulf] MPI ABI

Steffen Persvold sp at scali.com
Mon Oct 10 05:49:09 EDT 2005


Toon,

You seem to be forgetting all the different constants even in the Fortran
interface:

For example :

! return codes 
      INTEGER MPI_SUCCESS,MPI_ERR_BUFFER,MPI_ERR_COUNT,MPI_ERR_TYPE
      INTEGER MPI_ERR_TAG,MPI_ERR_COMM,MPI_ERR_RANK,MPI_ERR_ROOT
      INTEGER MPI_ERR_GROUP
      INTEGER MPI_ERR_OP,MPI_ERR_TOPOLOGY,MPI_ERR_DIMS,MPI_ERR_ARG
      INTEGER MPI_ERR_UNKNOWN,MPI_ERR_TRUNCATE,MPI_ERR_OTHER
      INTEGER MPI_ERR_INTERN,MPI_ERR_IN_STATUS,MPI_ERR_PENDING
      INTEGER MPI_ERR_REQUEST, MPI_ERR_LASTCODE
      PARAMETER (MPI_SUCCESS=0,MPI_ERR_BUFFER=1,MPI_ERR_COUNT=2)
      PARAMETER (MPI_ERR_TYPE=3,MPI_ERR_TAG=4,MPI_ERR_COMM=5)
      PARAMETER (MPI_ERR_RANK=6,MPI_ERR_ROOT=7,MPI_ERR_GROUP=8)
      PARAMETER (MPI_ERR_OP=9,MPI_ERR_TOPOLOGY=10,MPI_ERR_DIMS=11)
      PARAMETER (MPI_ERR_ARG=12,MPI_ERR_UNKNOWN=13)
      PARAMETER (MPI_ERR_TRUNCATE=14,MPI_ERR_OTHER=15)
      PARAMETER (MPI_ERR_INTERN=16,MPI_ERR_IN_STATUS=17)
      PARAMETER (MPI_ERR_PENDING=18,MPI_ERR_REQUEST=19)
      PARAMETER (MPI_ERR_LASTCODE=1073741823)


These are not the same on all MPI Implementations. I could also say
something on Fortran vs. C in general, but I won't ;)

Cheers,

Steffen Persvold
Technical Director Americas
tel. 508-281-7100 x401
fax. 508-281-7171

http://www.scali.com/
Scaling the Linux datacenter
 

> -----Original Message-----
> From: beowulf-bounces at beowulf.org [mailto:beowulf-bounces at beowulf.org] On
> Behalf Of Toon Knapen
> Sent: Monday, October 10, 2005 4:58 AM
> To: users at open-mpi.org; 'beowulf at beowulf.org'
> Subject: [Beowulf] MPI ABI
> 
> Coming back to the MPI ABI discussion (which dates back from a long time
> ago though), just one additional question (to which MPI implementers
> certainly have an interesting opinion):
> 
> Why don't we use the fortran interface instead of the C interface.
> Different C interfaces for MPI are likely incompatible because the type
> behind the MPI_Group etc. might all be different. Same goes for the
> named constants. In the fortran interface however the type's are always
> guaranteed to be int's.
> 
> Thus AFAICT if my app uses the fortran interface of MPI I can link my
> app with a dynamic library (say libmpi.so) which I can make point to
> either e.g. an MPICH implementation or POE. right?
> 
> toon
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