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Subject: Re: [OMPI users] segmentation fault
From: Gus Correa (gus_at_[hidden])
Date: 2010-12-15 18:45:33


Maybe a CFD jargon?
Perhaps the number (not size) of cells in a mesh/grid being handled
by each core/cpu?

Ralph Castain wrote:
> I have no idea what you mean by "cell sizes per core". Certainly not any
> terminology within OMPI...
>
>
> On Dec 15, 2010, at 3:47 PM, Vaz, Guilherme wrote:
>
>>
>> Dear all,
>>
>> I have a problem with openmpi1.3, ifort+mkl v11.1 in Ubuntu10.04
>> systems (32 or 64bit). My code worked in Ubuntu8.04 and works in
>> RedHat based systems, with slightly different version changes on mkl
>> and ifort. There were no changes in the source code.
>> The problem is that the application works for small cell sizes per
>> core, but not for large cell sizes per core. And it always works for 1
>> core.
>> Example: a grid with 1.2Million cells does not work with mpiexec -n 4
>> <my_app> but it works with mpiexec -n 32 <my_app>. It seems that there
>> is a maximum of cell/core. And it works with <my_app>.
>>
>> Is this a stack size (or any memory problem)? Should I set the ulimit
>> -s unlimited not only on my bashrc but also in the ssh environment
>> (and how)? Or is something else?
>> Any clues/tips?
>>
>> Thanks for any help.
>>
>> Gui
>>
>>
>>
>>
>> <imagec393d1.JPG><image4c4685.JPG>
>>
>> dr. ir. Guilherme Vaz
>>
>> CFD Researcher
>>
>>
>> Research & Development
>>
>>
>>
>>
>>
>> *MARIN*
>>
>>
>>
>>
>>
>> 2, Haagsteeg
>> E G.Vaz_at_[hidden] <mailto:G.Vaz_at_[hidden]> P.O. Box 28 T +31 317 49 39 11
>> 6700 AA Wageningen F +31 317 49 32 45
>> T +31 317 49 33 25 The Netherlands I www.marin.nl <http://www.marin.nl>
>>
>>
>> _______________________________________________
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>> users_at_[hidden] <mailto:users_at_[hidden]>
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>
>
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