MPI_Aint has the right number of bits to hold an address. For operations that are address space oriented, count can be the same size as an MPI_Aint MPI_Offset has the right number of bits to deal with the range in a file. For operations that are file oriented, arguments like count should be an MPI_Offset A problem is that MPI_Datatype constructors are intended to apply to both and it is common for a 32 bit address space to operate on files with 64 bit offsets. What type should "count" on the new "long" MPI_Datatype constructors be in this case? The proposal says MPI_Aint but that is awkward for datatypes as fileviews. 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 mpi-22-bounces_at_[hidden] wrote on 09/03/2008 12:38:35 PM:
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Re: [Mpi-22] New proposal: Support for large message counts
Supalov, Alexander
to:
MPI 2.2,
09/03/2008 12:48 PM
Sent by:
mpi-22-bounces_at_[hidden]
Please respond to "MPI 2.2"
Thanks. We may even do without changing the MPI routine names I think. Let's consider this:
1) #define MPI_Count int will yield the current MPI interface. 2) typedef int MPI_Count will yield the new 32-bit interface, still backward binary compatible with 1). 3) typedef long MPI_Count will yield new 64-bit interface. 4) typedef long long MPI_Count will safely bring us into XXII century (or earlier).
Old applications may be rebuilt using 1) without any changes, dynamically linked against MPI library built using 2), and will have to be rebuilt to use MPI library built using 3) or 4).
New applications will use library with the MPI_Count definitions, and, properly rebuilt, will work in either 32-, 64-, or 128-bit mode, using MPI libraries built using MPI bindings 2), 3), or 4), respectively.
By the way, should MPI_Count really be signed?
-----Original Message----- From: mpi-22-bounces_at_[hidden] [mailto:mpi-22-bounces_at_[hidden]] On Behalf Of Narasimhan, Kannan Sent: Wednesday, September 03, 2008 5:55 PM To: MPI 2.2 Subject: Re: [Mpi-22] New proposal: Support for large message counts
We can certainly consider this option, since it abstracts along the same lines as MPI_Offset.
Thanx! Kannan
-----Original Message----- From: mpi-22-bounces_at_[hidden] [mailto:mpi-22-bounces_at_[hidden]] On Behalf Of Supalov, Alexander Sent: Wednesday, September 03, 2008 10:19 AM To: MPI 2.2 Subject: Re: [Mpi-22] New proposal: Support for large message counts
Dear Kannan,
Thanks. Why don't we define MPI_Count datatype instead, and make that grow if necessary?
Best regards.
Alexander
-----Original Message----- From: mpi-22-bounces_at_[hidden] [mailto:mpi-22-bounces_at_[hidden]] On Behalf Of Narasimhan, Kannan Sent: Friday, August 29, 2008 6:15 PM To: mpi-22_at_[hidden] Subject: [Mpi-22] New proposal: Support for large message counts
I have submitted a new 2.2 proposal to addresses the need for large message counts (i.e. counts greater than the size of 32-bit integer) for MPI calls that communicate messages.
Please refer to https://svn.mpi-forum.org/trac/mpi-forum-web/wiki/mpi22/LargeMsgCounts for details.
Comments and suggestions are welcome.
Thanx! Kannan
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