[MITgcm-support] Compiler error when doubling horizontal resolution

[Habib Toye Mahamadou Kele]

Hi Roland,

Thank you for the update!

Regards,
Habib TOYE


On Mon, Jan 11, 2016 at 2:47 PM, Roland Young <young at atm.ox.ac.uk> wrote:

> Hi Habib,
>
> Thanks for your reply. I had seen a few of those links before - I found a
> few tips to get around the Fortran problem using information from those
> links, but I was unable to find anything that fixed the C problem.
>
> In any case, I was able to get around the problem in practice by
> increasing the number of cores. I was trying to test it on a 16-core
> desktop (before running it on 128 or 256). When I increased the number of
> cores to 64 for my test run the size of the arrays for each process became
> small enough that the requirement for mcmodel=medium went away.
>
> Thanks,
>
> Roland
>
>
>
>
>
>
> On 23/12/15 20:57, Habib Toye Mahamadou Kele wrote:
>
>> Hi Roland,
>>
>> The issue you encountered is due to the size of the arrays (you
>> increased the resolution therefore the arrays became larger). So you
>> need to review the memory storage management, by using compiler flag
>> (what you are trying to do) or modify the code (what I think you do not
>> want to do).
>>
>> I did not try to compile the code to reproduce your error and try to
>> solve it (because it would take me some time to set the code and compile
>> it).
>>
>> However the following links might be helpfull:
>>
>> http://mitgcm.org/pipermail/mitgcm-support/2006-September/004231.html
>>
>> http://mitgcm.org/pipermail/mitgcm-support/2006-September/004232.html
>>
>>
>>
>> https://software.intel.com/en-us/forums/intel-fortran-compiler-for-linux-and-mac-os-x/topic/270056?db=5
>> and then
>>
>> https://software.intel.com/en-us/articles/avoiding-relocation-errors-when-building-applications-with-large-global-or-static-data-on-intel64/
>>
>>
>>
>> http://stackoverflow.com/questions/10486116/what-does-this-gcc-error-relocation-truncated-to-fit-mean
>> (read the ticked response)
>> and then
>> https://www.technovelty.org/c/relocation-truncated-to-fit-wtf.html
>>
>>
>>
>> http://stackoverflow.com/questions/12916176/gfortran-for-dummies-what-does-mcmodel-medium-do-exactly
>>
>>
>>
>> http://stackoverflow.com/questions/11131998/from-which-version-of-gcc-does-mcmodel-large-work
>>
>>
>> Furthermore,
>> "the -shared-intel flag is not recognized by gcc" since it is a specific
>> intel flag.
>>
>>
>> Regards,
>> Habib TOYE
>>
>>
>> On Wed, Dec 23, 2015 at 9:43 PM, Roland Young
>> <Roland.Young at physics.ox.ac.uk <mailto:Roland.Young at physics.ox.ac.uk>>
>> wrote:
>>
>>     Hi,
>>
>>     I have just increased the horizontal resolution of my model from
>>     512x256x33 to 1024x512x33, but I am getting the following compiler
>>     error (example given for a C routine, but similar for Fortran):
>>
>>
>> /home/jupiter/gfd/young/runs/testing/h222_test/build/sigreg.c:34:(.text+0x3):
>>     relocation truncated to fit: R_X86_64_PC32 against symbol
>>     `sigreg_ip' defined in COMMON section in sigreg.o
>>
>>     I managed to remove this error from the Fortran routines by adding
>>     the following compiler flags
>>
>>     FFLAGS="$FFLAGS -mcmodel=medium -shared-intel”
>>
>>     However, I have not been able to remove it from the C routines. I
>>     have tried
>>
>>     CFLAGS="$CFLAGS -mcmodel=medium”
>>     CFLAGS="$CFLAGS -mcmodel=large”
>>     CFLAGS="$CFLAGS -mmodel=medium”
>>     CFLAGS="$CFLAGS -mmodel=large”
>>
>>     and all give the same error (the -shared-intel flag is not
>>     recognised by gcc). I think I’m on the right lines but what else
>>     needs to be done to fix the C compiler error?
>>
>>     Thanks,
>>
>>     Roland
>>
>>
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>>
>>
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>
> --
> Dr Roland Young, Postdoctoral Research Assistant
> Department of Physics, University of Oxford
> t: +44 (0)1865 272337 | e: young at atm.ox.ac.uk
> w: https://www.physics.ox.ac.uk/contacts/people/youngr
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