[Mpi-21] [Mpi-22] 2.1 cleanup or MPI 2.2?

[Rolf Rabenseifner]

Dick,

if I'm right, then 23.r is not similar.
23.r  OK  p183, lines 5-8.  This advice to implementors on reference counts for
          groups should include MPI_COMM_GROUP as a routine that increments the
          reference count.
I've put yours as 29.a
in 
http://www.hlrs.de/mpi/mpi21/doc/MPI-2.1draft-2008-02-23-review.txt

23.r I made an OK, but for your 29.a I would recommend to go to MPI-2.2.

Best regards
Rolf

On Mon, 7 Apr 2008 10:54:00 -0400
 Richard Treumann <treumann_at_[hidden]> wrote:
> 
> 
> In the description of MPI_COMM_FREE we presently give the following advise
> to implementors.
> 
> A reference-count mechanism may be used: the reference count is
> incremented by each call to \func{MPI\_COMM\_DUP}, and decremented by
> each call to \func{MPI\_COMM\_FREE}.  The object is ultimately
> deallocated when the count reaches zero.
> 
> I do not think it can ever be valid to implement MPI_COMM_DUP by simply
> returning a new handle for an existing communicator object while bumping
> its reference count because the output communicator must have a different
> context than the original.  Assuming I have not missed something, it seems
> this advise is nonsense.
> 
> Is removing this the kind of change that should go on the MPI 2.2 list?  I
> will be surprised if anyone offers a rationale for keeping the advise but I
> am also not quite comfortable that it fits within the "clean up" rules for
> MPI 2.1 at this late stage.
> 
> Thoughts?
> 
>                  Dick
> 
> 
> 
> Dick Treumann  -  MPI Team/TCEM
> IBM Systems & Technology Group
> Dept 0lva / MS P963 -- 2455 South Road -- Poughkeepsie, NY 12601
> Tele (845) 433-7846         Fax (845) 433-8363

Dr. Rolf Rabenseifner . . . . . . . . . .. email rabenseifner_at_[hidden]
High Performance Computing Center (HLRS) . phone ++49(0)711/685-65530
University of Stuttgart . . . . . . . . .. fax ++49(0)711 / 685-65832
Head of Dpmt Parallel Computing . . . www.hlrs.de/people/rabenseifner
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