[Mpi-comments] "safe" tag in MPI_Intercomm_create

[Jim Dinan]

I think that we should delete "safe" and leave any further changes for 
MPI-next.

  ~Jim.

On 9/7/12 12:44 PM, William Gropp wrote:
> Good point.  This moves this to MPI-next.
>
> Bill
>
> William Gropp
> Director, Parallel Computing Institute
> Deputy Director for Research
> Institute for Advanced Computing Applications and Technologies
> Paul and Cynthia Saylor Professor of Computer Science
> University of Illinois Urbana-Champaign
>
>
>
> On Sep 7, 2012, at 12:22 PM, Rolf Rabenseifner wrote:
>
>> If we ever make this routine a nonblocking collective,
>> the tag may be needed again, because I expect that
>> then, no two nonblocking MPI_Intercomm_create can be
>> active with the same tag.
>>
>> This means, one may include backward and future use.
>> It should not be a dummy. It should continue to
>> require to have a valid tag, i.e., in the tag space
>> between 0 and the value returned with inquiring MPI_TAG.
>>
>> Rolf
>>
>> ----- Original Message -----
>>> From: "William Gropp" <wgropp at illinois.edu>
>>> To: "Comments on the MPI Standard" <mpi-comments at lists.mpi-forum.org>
>>> Sent: Friday, September 7, 2012 5:55:14 PM
>>> Subject: Re: [Mpi-comments] "safe" tag in MPI_Intercomm_create
>>> Is this an MPI-next or a ticket zero change? Is this a chapter
>>> committee change (I think it should be, but I don't want to make that
>>> call unilaterally)?
>>>
>>> Bill
>>>
>>> William Gropp
>>> Director, Parallel Computing Institute
>>> Deputy Director for Research
>>> Institute for Advanced Computing Applications and Technologies
>>> Paul and Cynthia Saylor Professor of Computer Science
>>> University of Illinois Urbana-Champaign
>>>
>>>
>>>
>>> On Sep 6, 2012, at 5:36 PM, Jim Dinan wrote:
>>>
>>>> Hi Bill,
>>>>
>>>> That's right, the tag argument is vestigial as of MPI 3.0. I agree
>>>> with your suggestion of changing '"safe" tag' to:
>>>>
>>>> dummy - Ignored argument, retained for backward compatibility.
>>>>
>>>> ~Jim.
>>>>
>>>> On 9/6/12 5:02 PM, William Gropp wrote:
>>>>> I noted in ticket #305 that the argument is now ignored and
>>>>> retained only for backward compatibility. Deleting "safe" isn't
>>>>> enough.
>>>>>
>>>>> Bill
>>>>>
>>>>> William Gropp
>>>>> Director, Parallel Computing Institute
>>>>> Deputy Director for Research
>>>>> Institute for Advanced Computing Applications and Technologies
>>>>> Paul and Cynthia Saylor Professor of Computer Science
>>>>> University of Illinois Urbana-Champaign
>>>>>
>>>>>
>>>>>
>>>>> On Sep 6, 2012, at 1:47 PM, Jim Dinan wrote:
>>>>>
>>>>>> Hi All,
>>>>>>
>>>>>> It looks like we forgot to include the removal of the "safe"
>>>>>> qualifier from the tag argument as a part of the change to
>>>>>> MPI_Intercomm_create:
>>>>>>
>>>>>> https://svn.mpi-forum.org/trac/mpi-forum-web/ticket/305
>>>>>>
>>>>>> Specifying that the tag argument must be "safe" was made
>>>>>> unnecessary by this change, since it eliminates the possibility of
>>>>>> interference with user communication.
>>>>>>
>>>>>> ~Jim.
>>>>>> _______________________________________________
>>>>>> mpi-comments mailing list
>>>>>> mpi-comments at lists.mpi-forum.org
>>>>>> http://lists.mpi-forum.org/mailman/listinfo.cgi/mpi-comments
>>>>>
>>>>>
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>>
>> --
>> Dr. Rolf Rabenseifner . . . . . . . . . .. email rabenseifner at hlrs.de
>> 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)
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