[MITgcm-devel] SERIOUS performance problems with latest code

[Alistair Adcroft]

Patrick,

On what systems are you finding performance problems? At GFDL, there's 
been a major overhaul of OS's and there's been a backward compatibility 
problem with object files, executables and environment variables.

In your scripts for compiling and running you need to ensure you have 
these modules loaded:

 module purge
 module load icc.9.1.042
 module load ifort.9.1.033
 module load scsl-1.5.1.0
 module load mpt-1.14
 module load idb.9.0.12
 module load totalview_730-0

I believe the build_opts file for GFDL has a libarary reference that 
needs to be fixed also. With the above, particularly the mpt module, you 
should see a performance improvement over previous runs on the same machine.

A.

Patrick Heimbach wrote:
> It seems that the latest code has severe
> performance problems.
> My ECCO forward run takes 4 times the known
> performance at NASA/Ames, both with old and
> new optfiles/compilers.
>
> Baylor experiences similar problems,
> getting only 20% CPU time per wallclock time
> (expected value at GFDL is around 95%, I think).
>
> Anyone witnesses similar problems,
> or has ideas of what changes in code could cause it?
>
> -Patrick
>
>