[Mpi3-abi] Meeting notes from 10th March

[Jeff Squyres]

FWIW: the same is true for the Open MPI header file (contents depend  
on platform / compiler / etc.).

On Mar 14, 2008, at 7:45 PM, Supalov, Alexander wrote:

> Dear Erez,
>
> Thank you. I'm afraid that the MPICH2 mpi.h has not been configured  
> - it
> carries configure macros in the datatypes definition part and  
> elsewhere.
> By the way, I'm going to upload MPICH2 1.0.3 mpi.h early next week  
> as a
> placeholder for Intel MPI mpi.h, pending legal OK for the latter.
>
> I'll need to instantiate this file. According to my experience, the
> result may depend on the platform and compiler used. What
> platform/compiler should we use for reference? At least, what word  
> size
> should we target? I seek to eliminate an accidental apple to pears
> comparison here.
>
> Best regards.
>
> Alexander
>
> -----Original Message-----
> From: mpi3-abi-bounces_at_[hidden]
> [mailto:mpi3-abi-bounces_at_[hidden]] On Behalf Of Erez Haba
> Sent: Friday, March 14, 2008 7:47 PM
> To: MPI 3.0 ABI working group
> Subject: Re: [Mpi3-abi] Meeting notes from 10th March
>
> I have posted the mpi.h files to the wiki page and started a table
> comparing the various implementations.
>
> See http://svn.mpi-forum.org/trac/mpi-forum-web/wiki/Compare_mpi_h
>
> Thanks,
> .Erez
>
> -----Original Message-----
> From: mpi3-abi-bounces_at_[hidden]
> [mailto:mpi3-abi-bounces_at_[hidden]] On Behalf Of Solt, David
> George
> Sent: Friday, March 14, 2008 11:08 AM
> To: MPI 3.0 ABI working group
> Subject: Re: [Mpi3-abi] Meeting notes from 10th March
>
> 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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>>
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>
>
> --
> Jeff Squyres
> Cisco Systems
>
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-- 
Jeff Squyres
Cisco Systems