[MITgcm-devel] SERIOUS performance problems with latest code

[Baylor Fox-Kemper]

Hi Alistair,
   I have been seeing the problems and thought they were related to  
the GFDL upgrade.  In fact, I already have a HelpDesk request in.   
However, talking to Patrick made me think this wasn't the problem...  
or at least not all of it!
    -Baylor

On Oct 31, 2006, at 10:48 AM, Alistair Adcroft wrote:

> 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
>>
>>
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