Re: Segmentation fault

From: Craig Rudick <craig_at_fafnir.ASTR.cwru.edu>
Date: Mon, 4 Dec 2006 15:06:29 -0500 (EST)

Hi,

The problem seems to have been resolved by updating our MPI libraries from
Myricom's MPICH-GM v1.2.5..12 to v1.2.7..15.

Thanks Volker, and/or anyone else who took a look at this.

Craig

On Sat, 2 Dec 2006, Volker Springel wrote:

>
> On Wednesday 29 November 2006 22:44, Craig Rudick wrote:
>> Hi,
>>
>> We have been attempting to switch from Gadget1 to Gadget2, but have
>> been running into the problem that Gadget2 produces a segmentation
>> fault and dies when we try to run the example initial conditions. The
>> segmentation fault almost always occurrs during or immediately
>> following the first domain decomposition, with output that reads:
>>
>> domain decomposition...
>> Segmentation fault
>>
>> We have tried compiling using both the Portland Group and Intel
>> compilers and see the same behavior.
>>
>> The really frustrating part is that we only get this error depending on
>> both on the initial conditions used, and the number or processors on
>> which it is run. That is, the 'cluster' example IC runs perfectly on
>> up to 16 nodes, however all of the other example ICs will run only on
>> four or fewer nodes (2 processors per node).
>>
>> Has anyone seen similar errors with Gadget2 or have any ideas on what
>> might be the solution to this error?
>>
>
> Hi Craig,
>
> This is strange. I can't reproduce this problem on any of the machines I
> have access to (which are a few), and I also haven't heard from anyone
> else experiencing this error. It could be related to the set-up of your
> cluster and/or the compiler/MPI library you are using. I'd suggest to
> compile with the gcc-compiler (with -g) and look at the core file that's
> produced by the crash with a debugger. If the crash is reproducible, this
> would tell you if it is caused by gadget2, and where this happens.
>
> Volker
>
>
>
>
>> Thanks,
>> Craig Rudick
>> Case Western Reserve University
>>
>>
>>
>>
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>
>
>
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Received on 2006-12-04 21:06:42

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