[Mpi-forum] Fwd: MPI_Pack max buffer size

[Jeff Hammond]

Unlike many other cases where communicating >2 GB can be done with a
datatype workaround, MPI_PACK/UNPACK seem particularly vulnerable to
the 32-bit integer representation issue.

I don't know whether or not this has been discussed before (and
apologize if my message is redundant).  Is there a proposal for
MPI_(UN)PACK_COUNT yet?

Thanks,

Jeff


---------- Forwarded message ----------
From: Christoph Sprenger <csprenger at wetafx.co.nz>
Date: Wed, Oct 3, 2012 at 3:10 AM
Subject: [mpich-discuss] MPI_Pack max buffer size
To: mpich-discuss at mcs.anl.gov


Hi,

just wanted to double check if there is a way to Pack/Unpack bigger
char buffers than numeric_limits<int>::max() without tokenizing the
message into multiple chunks ?
seems like one of my messages is hitting these bounds unfortunately.

Cheers,
Christoph



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-- 
Jeff Hammond
Argonne Leadership Computing Facility
University of Chicago Computation Institute
jhammond at alcf.anl.gov / (630) 252-5381
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