[MITgcm-support] domain size limit?

[fancer lancer]

Hi Martin,
Ok, you use x86_64 version of compiler. And I suppose you don't specify any
additional parameters to the compiler like '-m32'.
Alas I don't have an Apple computer nearby to check the actual cause of the
problem. But I guess the clue to solve the issue may be found in the thread:
http://lists.apple.com/archives/xcode-users/2012/Jun/msg00118.html
And additional explanation is here:
http://lists.apple.com/archives/xcode-users/2012/Jun/msg00126.html

Sincerely,
-Sergey




On Tue, Dec 3, 2013 at 3:43 PM, Martin Losch <Martin.Losch at awi.de> wrote:

> Hi Sergey,
>
> I don’t know if Ryan’s compiler is the same (probably similar), but here’s
> mine:
>
> csysm15::build> gfortran -v
> Using built-in specs.
> COLLECT_GCC=gfortran
>
> COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc/x86_64-apple-darwin13.0.0/4.9.0/lto-wrapper
> Target: x86_64-apple-darwin13.0.0
> Configured with: ../gcc-4.9-20130929/configure
> --enable-languages=c,c++,fortran
> Thread model: posix
> gcc version 4.9.0 20130929 (experimental) (GCC)
>
> Martin
>
> On Dec 3, 2013, at 9:48 AM, fancer lancer <fancer.lancer at gmail.com> wrote:
>
> > 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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> >
> >
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