[MITgcm-devel] new r4 SingleCpuIO efficiency

[Patrick Heimbach]

Dimitris,
no more code updating with the CS510 adjoint.
Take what's working now as starting point for production.
Unless you can afford to do that in parallel to production.
-p.

On May 22, 2009, at 12:25 PM, Dimitris Menemenlis wrote:

> Jean-Michel, what is status of switch-over to new exchange topology?
> Do I still use the old w2_e2setup.F/W2_EXCH2_TOPOLOGY.h
> routines or do I need to update to the new stuff.
>
> Look forward to giving the r4 IO a try.  IO is biggest bottleneck
> both for forward as well as for adjoint integrations.
>
> D.
>
> On May 22, 2009, at 7:51 AM, Jean-Michel Campin wrote:
>
>> Hi Dimitris,
>>
>> If by chance you have time to check with a short run
>> how the new version of SingleCpuIO is doing on cs-510
>> (well, given the bug I put & remove only yesterday, I guess
>> you did not try yet), I would be curious to know if you
>> can see a speed up with large amount of r4 io (compared to
>> checkpoint61m). The volume of MPI send/receive for r4 io
>> has been reduced by 2 (was r8 before) and this might speed up
>> a little the run. And if something goes wrong, let me know.
>>
>> Thanks,
>> Jean-Michel
>
> Dimitris Menemenlis <menemenlis at jpl.nasa.gov>
> Jet Propulsion Lab, California Institute of Technology
> MS 300-323, 4800 Oak Grove Dr, Pasadena CA 91109-8099, USA
> tel: 818-354-1656;  cell: 818-625-6498;  fax: 818-393-6720
>
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