[MITgcm-devel] changing exch-1

[Jean-Michel Campin]

Dimitris,
OK, I understand. Matt has an other suggestion, but I am not
too familiar with how things evolve regarding the sensitivity,
so let you discuss this with him.
Jean-Michel

On Tue, May 04, 2010 at 07:48:06PM -0700, 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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