[Mpi-comments] "safe" tag in MPI_Intercomm_create

[William Gropp]

Ok, I'll delete safe.

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 1:23 PM, Rolf Rabenseifner wrote:

> Sounds good to me.
> The tag is still usefull as a security argument:
> If one process provides another tag (i.e., a wrong tag),
> then this routine may or will produce a deadlock,
> similar to pt-to-pt.
> 
> Rolf
> 
> ----- Original Message -----
>> From: "Jim Dinan" <dinan at mcs.anl.gov>
>> To: mpi-comments at lists.mpi-forum.org
>> Sent: Friday, September 7, 2012 8:14:29 PM
>> Subject: Re: [Mpi-comments] "safe" tag in MPI_Intercomm_create
>> 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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>>>>> 
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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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> 
> -- 
> 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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