[MITgcm-support] segmentation fault

Fri May 18 02:45:18 EDT 2018

Matt,

I cut all the unnecessary packages and still have the same issue.

I also checked 'size mitgcmuv' and compared the size to other runs which 
work - it asks for about half the size of other runs which work fine 
(same machine, same queue, same compiling options, etc).

The tiles are already down to 32x32 grid points, and I'm happily running 
configurations with a tile size almost twice as big and the same amount 
of vertical layers.

I will try some different tile sizes but I think the problem must be 
somewhere else..

Andreas

On 18/05/18 00:35, Matthew Mazloff wrote:
> Sounds like a memory issue. I think your executable has become too big 
> for you machine. You will need to reduce tile size or do something 
> else (e.g. reduce number of diagnostics or cut a package)
>
> and check
> size mitgcmuv
> to get a ballpark idea of how much memory you are requesting
>
> Matt
>
>
>
>> On May 16, 2018, at 11:27 PM, Andreas Klocker 
>> <andreas.klocker at utas.edu.au <mailto:andreas.klocker at utas.edu.au>> wrote:
>>
>> Hi guys,
>>
>> I've taken a working 1/24 degree nested simulation (of Drake Passage)
>> with 42 vertical layers and tried to increase the vertical layers to 150
>> (without changing anything else apart from obviously my boundary files
>> for OBCS and recompiling with 150 vertical layers). Suddenly I get the
>> following error message:
>>
>> forrtl: severe (174): SIGSEGV, segmentation fault occurred
>> Image              PC                Routine Line        Source
>> libirc.so 
>> <http://libirc.so> 
>>          00002BA1704BC2C9  Unknown Unknown  Unknown
>> libirc.so 
>> <http://libirc.so> 
>>          00002BA1704BAB9E  Unknown Unknown  Unknown
>> libifcore.so.5     00002BA1722B5F3F  Unknown Unknown  Unknown
>> libifcore.so.5     00002BA17221DD7F  Unknown Unknown  Unknown
>> libifcore.so.5     00002BA17222EF43  Unknown Unknown  Unknown
>> libpthread.so.0    00002BA1733B27E0  Unknown Unknown  Unknown
>> mitgcmuv_drake24_  00000000004E61BC  mom_calc_visc_ 3345  mom_calc_visc.f
>> mitgcmuv_drake24_  0000000000415127  mom_vecinv_ 3453  mom_vecinv.f
>> mitgcmuv_drake24_  0000000000601C33  dynamics_ 3426  dynamics.f
>> mitgcmuv_drake24_  0000000000613C2B  forward_step_ 2229  forward_step.f
>> mitgcmuv_drake24_  000000000064581E  main_do_loop_ 1886  main_do_loop.f
>> mitgcmuv_drake24_  000000000065E500  the_main_loop_ 1904  the_main_loop.f
>> mitgcmuv_drake24_  000000000065E6AE  the_model_main_ 2394 
>>  the_model_main.f
>> mitgcmuv_drake24_  00000000005C6439  MAIN__ 3870  main.f
>> mitgcmuv_drake24_  0000000000406776  Unknown Unknown  Unknown
>> libc.so.6          00002BA1737E2D1D  Unknown Unknown  Unknown
>> mitgcmuv_drake24_  0000000000406669  Unknown Unknown  Unknown
>>
>> First this error pointed to a line in mom_calc_visc.f on which
>> calculations regarding the Leith viscosity are done. As a test I then
>> used a Smagorinsky viscosity instead and now it crashes with the same
>> error, but pointing to a line where Smagorinsky calculations are done. I
>> assume I must be chasing a way more fundamental problem than one related
>> to these two viscosity choices...but I'm not sure what this might be....
>>
>> Has anyone got any idea of what could be going wrong here?
>>
>> Thanks in advance!
>>
>> Andreas
>>
>>
>>
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-- 
===============================================================
Dr. Andreas Klocker
Physical Oceanographer

ARC Centre of Excellence for Climate System Science
&
Institute for Marine and Antarctic Studies
University of Tasmania
20 Castray Esplanade
Battery Point, TAS
7004 Australia

M:     +61 437 870 182
W:     http://www.utas.edu.au/profiles/staff/imas/andreas-klocker
skype: andiklocker
===============================================================

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