[Mpi3-rma] nested locks

[William Gropp]

Brian makes a good point, and its a reminder that we need to look at everything with reference to the entire chapter.

Bill

William Gropp
Director, Parallel Computing Institute
Deputy Director for Research
Institute for Advanced Computing Applications and Technologies
Thomas M. Siebel Chair in Computer Science
University of Illinois Urbana-Champaign




On Aug 19, 2013, at 9:01 PM, Torsten Hoefler wrote:

> Agreed -- I think it's a bug and we should fix it asap.
> 
> Best,
>  Torsten
> 
> On Mon, Aug 19, 2013 at 03:47:39PM -0500, Rajeev Thakur wrote:
>> It is still disallowed in MPI-3 by this sentence
>> 
>> pg 437, ln 28: Distinct access epochs for win at the same process must be disjoint. 
>> 
>> 
>> On Aug 19, 2013, at 3:13 PM, Jim Dinan wrote:
>> 
>>> Jeff,
>>> 
>>> With apologies if I have misunderstood your question.  To clarify, the example Rajeev gave was forbidden in MPI-2.  One could not have concurrent passive target access epochs, even if they accessed different targets.  It is allowed in MPI-3.
>>> 
>>> ~Jim.
>>> 
>>> 
>>> On Mon, Aug 19, 2013 at 3:52 PM, Jeff Hammond <jeff.science at gmail.com> wrote:
>>> you mean lock at those ranks, not by those ranks?  those aren't conflicting so i don't see the issue.  maybe i am a dolt though.
>>> 
>>> jeff
>>> 
>>> 
>>> On Mon, Aug 19, 2013 at 2:44 PM, Rajeev Thakur <thakur at mcs.anl.gov> wrote:
>>> Did we make any change in MPI 3.0 to allow nesting of MPI_Win_lock calls? For example,
>>> 
>>> Win_lock(rank 1)
>>>    Win_lock(rank 2)
>>> 
>>>    Win_unlock(rank 2)
>>> Win_unlock(rank 1)
>>> 
>>> I can't find the text we added or deleted to allow this.
>>> 
>>> But I do see text that disallows this:
>>> pg 437, ln 28: "Distinct access epochs for win at the same process must be disjoint."
>>> 
>>> Rajeev
>>> 
>>> 
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>>> 
>>> 
>>> -- 
>>> Jeff Hammond
>>> jeff.science at gmail.com
>>> 
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>> 
>> 
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> 
> -- 
> ### qreharg rug ebs fv crryF ----------- http://htor.inf.ethz.ch/ -----
> Torsten Hoefler           | Assistant Professor
> Dept. of Computer Science | ETH Zürich
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