[mvapich-discuss] Seg fault in MPI_Finalize with many windows

[sreeram potluri]

Pavan, Jim

This is related to how ib registration information for the windows is
managed. I see that this limitation can be addressed without making any
sub-optimal choices. We plan to fix this in the upcoming release.

Thank you
Sreeram Potluri

On Fri, Oct 8, 2010 at 6:32 PM, Pavan Balaji <balaji at mcs.anl.gov> wrote:

> Sreeram,
>
> What exactly is the limitation here? Why does MVAPICH2 need to know the
> number of windows upfront?
>
>  -- Pavan
>
>
> On 10/08/2010 04:49 PM, sreeram potluri wrote:
>
>> Hi Jim,
>>
>> Thank you for reporting the problem. MVAPICH2 allows for increasing the
>> maximum number of concurrent windows, at run-time. You can do this by
>> setting the MV2_MAX_NUM_WIN parameter.
>>
>> Example : ./mpirun_rsh -np 2 node1 node2 MV2_MAX_NUM_WIN=100 window_test
>>
>> http://mvapich.cse.ohio-state.edu/support/user_guide_mvapich2-1.5.1.html#x1-12100011.30
>>
>> However the overflow showing up as a segmentation fault during finalize
>> is not a good side effect. We will enhance error handling for this
>> scenario soon.
>>
>> Please let us know if you see any other issues or have any other
>> questions.
>>
>> Thank you
>> Sreeram Potluri
>>
>> On Fri, Oct 8, 2010 at 5:13 PM, James Dinan <dinan at mcs.anl.gov
>> <mailto:dinan at mcs.anl.gov>> wrote:
>>
>>    Hi,
>>
>>    I'm getting a seg fault during MPI_Finalize after creating more than
>>    64 windows.  I have attached a small test code that exercises the
>>    bug, it creates N windows and then frees them.
>>
>>    I first noticed the bug with mvapich2-1.4.1-intel on Glenn at OSC
>>    where it happens with more than 16 windows and confirmed it with
>>    mvapich2 1.5.1p1 where it happens with more than 64 windows.
>>
>>    This limitation on the number of windows will be a problem for an
>>    application we're working on here.  Any help would be greatly
>>    appreciated.
>>
>>    Thanks,
>>      ~Jim.
>>
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>>
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>>
>>
>>
>>
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>
> --
> Pavan Balaji
> http://www.mcs.anl.gov/~balaji
>
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