[MITgcm-support] CRAY XD1

[Martin Losch]

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
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