[MITgcm-support] segmentation fault

Matthew Mazloff mmazloff at ucsd.edu
Thu May 17 10:35:11 EDT 2018


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> 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          00002BA1704BC2C9  Unknown Unknown  Unknown
> 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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