[MITgcm-support] CRAY XD1

[chris hill]

Hi Martin,

  If you can get us an account that would be great.

Thanks,

Chris
Martin Losch wrote:
> Chris,
> 
> I had help from the CRAY support, and they could get rid of the problem 
> by removing the -r8 option for the pgf77 compiler. Now I only get 
> segmentation faults if I the number of CPUs is too large (currently 50 
> is a problem). But the CRAY people can reproduce this and promised to 
> find the problem. I assume that there's a bug in the MPI implementation 
> (MPICH). In the meantime, I have asked for test accounts (again), in 
> case you are interested, but not success so far (neverending story). 
> I'll keep you posted.
> 
> Martin
> 
> On Apr 1, 2005, at 3:17 PM, Chris Hill wrote:
> 
>> Hi Martin,
>>
>>  Did you get anywhere on this (I can't see a reply but I have been away).
>>  On thing that can make this symptom happen is stacksize problems in a 
>> shell. Can you set the shell stacksize to "unlimited" for your shell 
>> and see what happens. I can't remember the command for this and I'm 
>> not properly on line - its something like "ulimit" I think.
>>
>> Chris
>> Martin Losch wrote:
>>
>>> Hi,
>>> we have a new platform, a CRAY XD1, (basically opteron CPUs with a 
>>> very fast network). I have a hard time on this machine:
>>> I was able to run a global_ocean experiment (180x80x23, the ecco 2deg 
>>> configuration, with KPP, GMRedi, etc.) with up to 12CPUs, scales and 
>>> everything, but I have a different configuration (1500x1x100, or 
>>> 256x256x100,  cartesian coordinates, non-hydrostatic, but no other 
>>> extra packages, no netcdf, runs fine on many platforms with up to 
>>> 20CPUs so far), which ends with a segmentation fault in the routine 
>>> packages_boot.F (actually, while printing a message with 
>>> print_message). Works only with MPI turned off.
>>> For these two cases I use the same build_options file 
>>> (linux_amd64_pgf77+mpi_xd1).
>>> Any idea what might be going on?
>>> Martin
>>> _______________________________________________
>>> MITgcm-support mailing list
>>> MITgcm-support at mitgcm.org
>>> http://dev.mitgcm.org/mailman/listinfo/mitgcm-support
>>
>>
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> 
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