[mpich-discuss] MPICH-3.1.4 with PAMID: Win_lock

[Sebastian Rinke]

OK.

Sebastian

On 30 Mar 2017, at 17:49, Jeff Hammond <jeff.science at gmail.com> wrote:

> I recommend filing the bug regarding the supported MPI.  I can't find any statement in the MPI standard indicating it shouldn't work.
> 
> Jeff
> 
> On Thu, Mar 30, 2017 at 8:34 AM, Sebastian Rinke <rinke at cs.tu-darmstadt.de> wrote:
> Thanks a lot for your answer!
> 
> The same problem occurs in the supported MPI-2.2 on BGQ.
> Ok, I will try the OFI-based MPI-3.
> 
> Thanks,
> Sebastian
> 
> On 30 Mar 2017, at 17:12, Jeff Hammond <jeff.science at gmail.com> wrote:
> 
>> I guess this is a bug but MPICH 3.1.x isn't the basis for the supported MPI on BGQ, so I doubt you will get much traction by reporting it.  IBM made an effort to support MPI-3 with PAMID but it was as an open-source, best effort project, and I recall there were some issues with it, including deadlock in certain asynchronous operations.
>> 
>> You should try the supported MPI-2.2 implementation on BGQ or try the unsupported OFI-based implementation of MPI-3.
>> 
>> Disclaimer: The comments above are spoken in my capacity as the person who used to support MPI at ALCF, not my current job role.
>> 
>> Best,
>> 
>> Jeff
>> 
>> On Thu, Mar 30, 2017 at 3:21 AM, Sebastian Rinke <rinke at cs.tu-darmstadt.de> wrote:
>> Same window, i.e.:
>> 
>> Process 0:
>> 
>> Win_lock(MPI_LOCK_SHARED, target=A, window=win)
>> Win_lock(MPI_LOCK_SHARED, target=B, window=win)
>> 
>> Sebastian
>> 
>> 
>> On 30 Mar 2017, at 06:24, Jeff Hammond <jeff.science at gmail.com> wrote:
>> 
>>> Same window or different windows?
>>> 
>>> Jeff
>>> 
>>> On Wed, Mar 29, 2017 at 5:59 PM Sebastian Rinke <rinke at cs.tu-darmstadt.de> wrote:
>>> Dear all,
>>> 
>>> I have some issue with MPI_Win_lock in MPICH-3.1.4 on Blue Gene/Q.
>>> 
>>> Here is my example:
>>> 
>>> Process 0:
>>> 
>>> Win_lock(MPI_LOCK_SHARED, target=A)
>>> Win_lock(MPI_LOCK_SHARED, target=B)
>>> 
>>> No matter what I use for A and B (given A != B), a process cannot acquire more than one lock
>>> at a time.
>>> 
>>> To my understanding, it should be possible to acquire more than one lock.
>>> 
>>> Can you confirm this issue?
>>> 
>>> Thanks,
>>> Sebastian
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>>> -- 
>>> Jeff Hammond
>>> jeff.science at gmail.com
>>> http://jeffhammond.github.io/
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>> 
>> 
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>> 
>> 
>> -- 
>> Jeff Hammond
>> jeff.science at gmail.com
>> http://jeffhammond.github.io/
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> 
> 
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> 
> 
> -- 
> Jeff Hammond
> jeff.science at gmail.com
> http://jeffhammond.github.io/
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