[Mpi3-abi] Open MPI and ABI

[Jeff Brown]

ditto here (we are all busy)

it may be a short meeting then!

At 09:55 AM 12/12/2008, you wrote:
>I am sorry Jeff, there was no progress on my front wrt ABI.
>
>From: mpi3-abi-bounces_at_[hidden] 
>[mailto:mpi3-abi-bounces_at_[hidden]] On Behalf Of Jeff Brown
>Sent: Thursday, December 11, 2008 9:21 AM
>To: MPI 3.0 ABI working group
>Cc: craig Rasmussen; ddd_at_[hidden]; Ralph Castain
>Subject: Re: [Mpi3-abi] Open MPI and ABI
>
>All,
>
>At the last meeting I attended (Dublin) we 
>discussed developing a prototype "morph" ABI 
>layer with initial implementation targeting the 
>December meeting.  Let's take stock of this 
>effort when we meet next week.  As I recall, 
>Ezra offered to lead the windows implementation, 
>and Alexander linux.  This exercise is meant to 
>expose some of the implementation details and 
>help drive us toward a detailed standard 
>proposal we can take to the larger group.
>
>Ezra and Alexander, please brief us on this 
>effort when we meet next Wednesday.
>
> >From the Dublin meeting:
>•MPI ABI standard, separate from MPI API 
>standard, but under the umbrella of the MPI Forum
>•Dynamic link is the main objective (binary compatibility)
>•Startup (mpirun/mpiexec) is a secondary objective
>•Include all major language bindings in the ABI 
>standard (C, C++, Fortran) as we go
>•Tied to MPI 2.1 and forward
>•Implementers may choose to comply (or not)
>•May be implemented as a morph layer or native
>•Initial reference implementation will be a morph layer (tbd who provides)
>•May be different per platform (Linux, Windows, …)
>•Different voting rules separate from MPI API forum (?)
>•Need participation from major implementors in order to make progress
>
>mpi.h: MPICH 2 (1.0.7) as base with mods as 
>needed (e.g. max values for compile time values used in declarations)
>Proceed with a reference morph layer 
>implementation targeting (at least) MPICH 2.0, OpenMPI
>Load a different module and it just works
>Demonstrate with a ring program
>Defer startup consideration
>
>Proof of concept reference morph layer implementations:
>•Flesh out details by writing some code
>•Linux on X86-64 cluster Red Hat Linux/SUSE
>•Windows on X86-64 cluster
>•Test against ring program
>•Bring back to the December forum meeting
>
>see ya next week
>
>Jeff
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