[MITgcm-devel] changing exch-1

[Matthew Mazloff]

Dimitris, can't you just run a few days backward to see the issue?

-Matt


On May 4, 2010, at 7:48 PM, Menemenlis, Dimitris (3248) wrote:

> Jean-Michel, we'll give the updated code a try.
> It's a huge computation, 1 week on ~4000 cpus,
> so my preference is to move forward one iteration.
> If things don't work out, we could come back and
> try some shorter tests on the CS510 with old and
> with new code.  Dimitris
>
> On May 4, 2010, at 6:26 PM, Jean-Michel Campin wrote:
>
>> Hi Dimitris,
>>
>> I think it would be better to re-do one iteration you already done
>> (onless you don't have time to do it) so that we can be sure.
>> I think it's worth to try, since you have this tiling problem.
>> And no need to do more than 1 iteration.
>>
>> I only did very short test (1 time step, using lab_sea/ 
>> input_ad.noseaice
>> and switching on EXCH2), but I was seeing differences at tile edges
>> in the forcing sensitivity (which make sense since it was in exf),
>> same as you listed, and not in Precip.
>> But don't know how this propagate.
>>
>> Cheers,
>> Jean-Michel
>>
>> PS: there was also the AD global sum issue (which relates to
>> MPI domain decomposition) which has been fixed, but no idea if this
>> could be the cause of tile-edge discontinuity.
>
>
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