[MITgcm-support] problems at tile bdys?

[Jean-Michel Campin]

Hi Jody,

I tried to lower the compiler optimisation to just "-O1" and
the problem is gone.

I guess one can try to find which routine(s) ifort (13.0) fails to compile
correctly with -O2, and then they can be listed in the NOOPTFILES list
with NOOPTFLAGS beeing set to just "-O1".

Cheers,
Jean-Michel

On Wed, Jun 19, 2013 at 06:19:24PM -0400, Jean-Michel Campin wrote:
> Hi Jody,
> 
> I tried to reproduce the problem, using your set-up with sNx=47,nPx=8
> (sNy=16,nPy=2):
> 1) it runs fine with no tile egdes problem on the 1rst cluster, using
>  gfortran and openmpi (optfile: linux_amd64_gfortran);
> 2) same good results on an other cluster, using
>  ifort (10.0.025) and mpich-mx-1.2.7 (optfile: linux_amd64_ifort_beagle)
> 3) but when I try (on the 1rst cluster) to use
>  ifort (13.0.0.079) and mvapich2-1.7 (optfile: linux_amd64_ifort11)
>  it blows up at iteration 68 and show same problems as in your run.
>  And with same compiler/mpi/optfile, with sNx=48 it runs fine (no problem).
>  
> So, it looks like there is a problem with ifort 13.0 (can't be MPI
>  since your are using the intel one and (3) fails with mpich2).
> Will take a look at compiler options.
> 
> Cheers,
> Jean-Michel
> 
> PS: The problem in Yuan's setup is different: it can be reproduced with
>  gfortran & openmpi.
> 
> On Mon, Jun 17, 2013 at 08:39:18PM -0700, Jody Klymak wrote:
> > 
> > On Jun 17, 2013, at  17:29 PM, Jody Klymak <jklymak at uvic.ca> wrote:
> > 
> > > If I run with nx=48, then I do not get an instability.  If I run with nx=47, I do (see attached PDFs).  If I run with exch2, the instability is different, but still there.
> > 
> > I should clarify, the instability is probably different between exch1 and exch2 because the initial conditions for \eta were different.  I initialize \eta with random red noise, so different realizations have a different instability response.  
> > 
> > Thanks,   Jody
> > 
> > --
> > Jody Klymak    
> > http://web.uvic.ca/~jklymak/
> > 
> > 
> > 
> > 
> > 
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