I have to wonder if MPI_BOTTOM will cause us headaches. MPI_BOTTOM is meant to be used directly as an address. Our ABI would really have to specify exactly what that address is using either a constant or the address of a variable in the library. We have found that many non-compliant codes exist which assume that MPI_BOTTOM is zero. Assuming MPI_BOTTOM lives on to MPI-3, the ABI effort may want to dictate its value on a per-target architecture/OS basis, with ((void*) 0) the most obvious setting for nearly all targets. Dave -----Original Message----- From: mpi3-abi-bounces_at_[hidden] [mailto:mpi3-abi-bounces_at_[hidden]] On Behalf Of Jeff Squyres Sent: Friday, March 14, 2008 11:36 AM To: MPI 3.0 ABI working group Subject: Re: [Mpi3-abi] Meeting notes from 10th March Perhaps you could just link to OMPI's header file -- it's a live copy of what's in our SVN repository: https://svn.open-mpi.org/trac/ompi/browser/trunk/ompi/include/mpi.h.in On Mar 14, 2008, at 12:21 PM, Erez Haba wrote:
I will upload the various mpi.h files and start the table on the ABI wiki page.
-----Original Message----- From: mpi3-abi-bounces_at_[hidden] [mailto:mpi3-abi-bounces_at_[hidden] ] On Behalf Of Jeff Brown Sent: Thursday, March 13, 2008 3:11 PM To: MPI 3.0 ABI working group; mpi3-abi_at_[hidden] Subject: Re: [Mpi3-abi] Meeting notes from 10th March
I propose a way we can make progress ...
Let's start populating a matrix (excel spreadsheet) with a column for each MPI implementation, and rows for the various MPI datatypes, constants, etc. where the internal implementations varys. I'll kick it off for OpenMPI and send out.
The last column of the matrix can be "ABI" where we propose a common approach across the implementations.
A couple of driving principles: 1. the ABI solution shouldn't negatively impact quality of implementation 2. minimize platform specific solutions
I'd like to see if we can produce a single ABI that spans platforms.
comments?
Jeff
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