[mpi-21] Ballot 4 - Re: Request for interpretation

[Cownie, James H]

However, you have apparently lost the liberty to have undefined behavior
which was there in the previous version.

 

Maybe you should keep that, something like 

An implementation must support info objects as caches for arbitrary
(key, value) pairs, regardless of whether it recognizes the keys. Each
MPI function which takes hints in the form of an MPI_Info must
be prepared to ignore any key it does not recognize. However if a
function recognizes a key but not the associated value, then the
behavior is undefined.

(Modifications in italics)

-- Jim

James Cownie <james.h.cownie_at_[hidden]>
SSG/DPD/PAT
Tel: +44 117 9071438

________________________________

From: mpi-21-bounces_at_[hidden] [mailto:mpi-21-bounces_at_[hidden]] On
Behalf Of Richard Treumann
Sent: 31 January 2008 13:29
To: Mailing list for discussion of MPI 2.1
Subject: Re: [mpi-21] Ballot 4 - Re: Request for interpretation

 

Your wording works for me Rolf. -- Thanks

Dick Treumann - MPI Team/TCEM 
IBM Systems & Technology Group
Dept 0lva / MS P963 -- 2455 South Road -- Poughkeepsie, NY 12601
Tele (845) 433-7846 Fax (845) 433-8363

mpi-21-bounces_at_[hidden] wrote on 01/31/2008 05:25:46 AM:

> I try to summarize all 3 replies in one proposal:
> 
> ___________________________________
> 
> Proposal:
> MPI 2.0, Sect. 4.10 Info Objects, page 43, line 38-40 read:
>    If a function does not recognize a key, 
>    it will ignore it, unless otherwise specified.
>    If an implementation recognizes a key but does not recognize 
>    the format of the corresponding value, the result is undefined.
> but should read:
>    An implementation must support info objects as caches for arbitrary
>    (key, value) pairs, regardless of whether it recognizes the pairs.
>    Each MPI function which takes hints in the form of an MPI_Info must
>    be prepared to ignore any key it does not recognize.
> 
> Add after MPI 2.0, Sect. 4.10 Info Objects, page 44, line 22 a new
> paragraph:
>    Advice to implementors.
>    Although in MPI functions that take hints in form of an MPI_Info
>    (e.g., in process creation and management, one-sided communication,

>    or parallel file I/O), an implementation must be prepared to ignore

>    keys that it does not recognize, for the purpose of
MPI_INFO_GET_NKEYS, 
>    MPI_INFO_GET_NTHKEY, MPI_INFO_GET_VALUELEN, and MPI_INFO_GET, the 
>    implementation must retain all (key,value) pairs so that layered 
>    functionality can also use the Info object.
>    (End of advice to implementors.)
> _____________________________
> Rationale for this clarification:
>   
>    The MPI-2.0 text allowed that also MPI_INFO_DELETE, MPI_INFO_SET,
>    MPI_INFO_GET, and MPI_INFO_DUP could ignore (key,value) pairs
>    that are not recognized in routines in other chapters that
>    take hints with info arguments.
>    The proposed clarification is necessary when we assume, that 
>    layered implementation of parts of the MPI-2 standard should 
>    be possible and may use the MPI_Info objects for their needs.
>    This was a goal of the MPI-2 Forum and the MPI-2.0 specification.
> ___________________________________
> 
> Bronis, for me, your wording "an MPI implementation may restrict" was
> in conflict with the rest of the advice. I hope the formulation above
> is also okay. It is based on the new wording from you and Dick in
first 
> part of the proposal.
> 
> Best regards
> Rolf
> 
> 
> Dr. Rolf Rabenseifner . . . . . . . . . .. email rabenseifner_at_[hidden]
> High Performance Computing Center (HLRS) . phone ++49(0)711/685-65530
> University of Stuttgart . . . . . . . . .. fax ++49(0)711 / 685-65832
> Head of Dpmt Parallel Computing . . . www.hlrs.de/people/rabenseifner
> Nobelstr. 19, D-70550 Stuttgart, Germany . (Office: Allmandring 30)
> _______________________________________________
> mpi-21 mailing list
> mpi-21_at_[hidden]
> http://lists.cs.uiuc.edu/mailman/listinfo/mpi-21

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