[Mpi3-ft] FT Working Group Teleconf (today)

Wed Mar 24 12:12:07 CDT 2010

Sorry - I do not see how that solves the problem. Compiled application code
allocates some number of bytes based on a structure declaration in C or a
constant (MPI_STATUS_SIZE) in Fortran. Each byte in the structure is
required because the MPI library has a use for it. There will not be spare
bytes that can be used to cache the extra baggage.

Dick Treumann  -  MPI Team
IBM Systems & Technology Group
Dept X2ZA / MS P963 -- 2455 South Road -- Poughkeepsie, NY 12601
Tele (845) 433-7846         Fax (845) 433-8363

  From:       Greg Bronevetsky <bronevetsky1 at llnl.gov>                                                                                       

  To:         "MPI 3.0 Fault Tolerance and Dynamic Process Control working Group" <mpi3-ft at lists.mpi-forum.org>, "MPI 3.0 Fault Tolerance    
              and Dynamic Process Control working Group" <mpi3-ft at lists.mpi-forum.org>                                                       

  Date:       03/24/2010 12:36 PM                                                                                                            

  Subject:    Re: [Mpi3-ft] FT Working Group Teleconf (today)                                                                                

  Sent by:    mpi3-ft-bounces at lists.mpi-forum.org                                                                                            

>I agree with Dick. We're getting very strong ISV feedback that an
>MPI-3 compatibility break will constitute a serious adoption barrier for
them.

The other option would be to have an extra function like
MPI_Get_count that extracts internal information from MPI_Status
objects. Can that be implemented without breaking compatibility?

Greg Bronevetsky
Lawrence Livermore National Lab
(925) 424-5756
bronevetsky at llnl.gov
http://greg.bronevetsky.com

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