[MITgcm-support] domain size limit?

[fancer lancer]

Hi Ryan,

Could you please, show the result of the command "gfortran -v". I suppose,
that you used the 32-bit version of the compiler that is why you overcame
the limit.

Sincerely,
-Sergey


On Tue, Dec 3, 2013 at 12:29 PM, Martin Losch <Martin.Losch at awi.de> wrote:

> Hi Ryan,
>
> I can only reproduce the problem with tutorial_barotropic_gyre (and
> gcc/gfortran 4.9 on OSX 10.9).
>
> By how much do you have to repduce the domain size to make it work?
>
> The simplest solution that I found: instead of sNy=1600 and nSy = 1 use
> sNy=800 and nSy = 2. It’s a little bit of cheating, isn’t it?
>
> Martin
>
> On Dec 3, 2013, at 6:00 AM, Ryan Abernathey <ryan.abernathey at gmail.com>
> wrote:
>
> > Dear Super Modelers,
> >
> > I found a weird error when trying to compile a large domain (500 x 1600
> x 1) on a single processor. On the final link stage of the build, I get:
> > ld: 32-bit RIP relative reference out of range (2162237024 max is
> +/-4GB): from _find_beta__ (0x100227200) to _rhoden.4514 (0x18103AE80) in
> '_find_beta__' from find_alpha.o for architecture x86_64
> > The error disappears if I just reduce sNx * sNy. I guess this has
> something to do with running out of memory address space? Is it weird that
> "32-bit RIP" is being used even though my platform is 64 bit?
> >
> > My one weak attempt to overcome this was by adding -fPIC to my FFLAGS.
> No success.
> >
> > Is there any way to overcome this problem, or am I hitting some kind of
> fundamental limit to the domain size?
> >
> > Thanks for your suggestions,
> > Ryan
> >
> >
> > My platform is Mac OX 10.8.5, Intel Core i7, gcc version 4.2.1 (via
> xcode), gfortran GNU Fortran (GCC) 4.7.1. My optfile is the default
> darwin_amd64_gfortran.
> >
> > From my SIZE.h:
> >      &           sNx = 500,
> >      &           sNy = 1600,
> >      &           OLx =   4,
> >      &           OLy =   4,
> >      &           nSx =   1,
> >      &           nSy =   1,
> >      &           nPx =   1,
> >      &           nPy =   1,
> >      &           Nx  = sNx*nSx*nPx,
> >      &           Ny  = sNy*nSy*nPy,
> >      &           Nr  =   1)
> >
> >
> >
> >
> > _______________________________________________
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> > MITgcm-support at mitgcm.org
> > http://mitgcm.org/mailman/listinfo/mitgcm-support
>
>
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