[MITgcm-devel] problem with argument list of adthe_main_loop

Tue Apr 27 09:06:01 EDT 2010

Hi Patrick,

thanks, I think Takasumi followed "cost_atlantic_heat" (at least the code looks like that).
Based on his work, I have now (after a few tweaks) a 5 timestep adjoint simulation that makes sense, however with the seaice package disabled.
When I turn on the seaice package, many recomputations appear (and I don't mean the "benign" ones related to dsigmadr, tsurfloc, alb, tices, fld(in advect.F), cvv, cuu, etc), see for example: ross.mit.edu:/raid1/mlosch/MITgcm/cs32/build_ad/taf_ad.log
I am not sure, but I think the recomputations are found around line 101510 in ad_taf_output.f where within do ilev_1, another "do ilev_18" starts. The resulting run takes about 2-3 times longer than with out seaice. Is this correct? Do I have to live with that? 

Martin

On Apr 27, 2010, at 2:03 PM, Patrick Heimbach wrote:

> 
> Hi Martin,
> 
> very quickly, it should work both ways,
> but "easier" seems without ECCO package (less "baggage").
> I've been running various sensitivities using a setup 
> with seaice using ECCO-setup, but without ECCO package.
> 
> As a starting point, if you want to try non-ECCO route,
> take a look at what's in
> cost_accumulate_mean.F and cost_atlantic_heat.F
> The latter is a bit rudimentary and out of date,
> but contains several cost functions.
> You'll need to adapt to general grid geometry.
> 
> -p.
> 
> On Apr 27, 2010, at 2:41 AM, Martin Losch wrote:
> 
>> Hi Patrick,
>> 
>> 
>> sorry for the inaccurate description of the problem. I was just looking for a general explanation/direction. Both you have provided, thanks. 
>> 
>> 
>> I found that with ecco, you need at least one "time-dependent" costfunction contribution (e.g. ALLOW_THETA_COST_CONTRIBUTION) for the "mytime" to appear in the argument list of adthe_main_loop. This corresponds to your description.
>> 
>> 
>> In the end I/we want to use the ecco package in a "standard" form so that this problem will not affect use, but right now I want to compute the sensitivity to meridional overturning in a cs32 configuration with seaice. We (Takasumi and I) tried with and without the ecco package.
>> 1. without ecco: I put my cost function computations into cost_test (just as in bottom_ctrl_5x5) and get many recomputations, most likely due to the seaice (at least they all go away when I turn off seaice). Since I did not have time then (and do not have it now either, unfortunately) to dig into that, I recommended to Takasumi to try this:
>> 2. with the ecco package, I put my cost function into cost_usercost_all.F and I do not get recomputations (however so far I also did not get a cost contributions from cost_usercost, I have just started with that, so give me some more time), but we have this "mytime, mythid" problem. I can now circumvent that by having fake theta-cost functions (with mult_theta=0.)
>> 
>> 
>> So my question is, according to your experience, which route will be faster to the goal (sensitivity of the overturning with respect to surface forcing), the ecco or the non-ecco route. I have the feeling the non-ecco route, but only if you point me to where I have insert store directives to fix the recompuations. If you find the time (today), I'd love to show you my configuration.
>> 
>> 
>> Martin
>> 
>> 
>> ----- Original Message -----
>> From: Patrick Heimbach <heimbach at MIT.EDU>
>> Date: Tuesday, April 27, 2010 5:07
>> Subject: Re: [MITgcm-devel] problem with argument list of adthe_main_loop
>> To: MITgcm-devel at mitgcm.org
>> 
>> > 
>> > Hi Martin,
>> > 
>> > I haven't looked into this in a long time.
>> > As you see, the "broad" behavior is that
>> > mycurrenttime is kept for ECCO, but not otherwise.
>> > 
>> > If I remember correctly, I tried a number of ways to "recompute" 
>> > mycurrenttimewithin the_main_loop and make it "self-sufficient" 
>> > (e.g. use starttime), but didn't help much.
>> > I think I also tried the other way round, i.e. "force" TAF to 
>> > keep mycurrenttime always,
>> > but didn't help much either.
>> > My hunch is it has to do with the use (or non-use) of the 
>> > cost_averages... routines.
>> > 
>> > But would have to see your setup in detail ;)
>> > in particular, what's the difference between the two cases.
>> > 
>> > I had not pursued this further, since it seems stable for most 
>> > applications,and can be easily changed in case of unexpected behavior.
>> > 
>> > Cheers
>> > -p.
>> > 
>> > On Apr 26, 2010, at 9:08 AM, Martin Losch wrote:
>> > 
>> > >Hi there (Patrick in particular),
>> > >
>> > >I found this in the archives (the search functions seems to 
>> > work better):
>> > >http://forge.csail.mit.edu/pipermail/mitgcm-devel/2008-
>> > June/003425.html>and I seem to have a similar problem in a 
>> > particular configuration:
>> > >in ad_taf_output.f I find
>> > >subroutine adthe_main_loop(mythid)
>> > >but it's called as adthe_main_loop(mycurrenttime, mythid) from 
>> > the_model_main.F>
>> > >I have other configurations where taf properly produces 
>> > "subroutine adthe_main_loop(mytime,mythid)", but I cannot see 
>> > why. Both configurations use the ecco package (so ALLOW_ECCO is 
>> > defined, that's why the_model_main requires mytime and mythid) 
>> > and pretty similar ECCO_CPPOPTIONS.h.
>> > >
>> > >Can you point me to the critical parameters that let taf 
>> > produce the argument list with (mytime, mythid)? Is the type of 
>> > cost function?
>> > >
>> > >Martin
>> > >
>> > >
>> > >
>> > >_______________________________________________
>> > >MITgcm-devel mailing list
>> > >MITgcm-devel at mitgcm.org
>> > >http://mitgcm.org/mailman/listinfo/mitgcm-devel
>> > 
>> > ---
>> > Patrick Heimbach | heimbach at mit.edu | http://www.mit.edu/~heimbach
>> > MIT | EAPS 54-1518 | 77 Massachusetts Ave | Cambridge MA 02139 USA
>> > FON +1-617-253-5259 | FAX +1-617-253-4464 | SKYPE patrick.heimbach
>> > 
>> > 
>> > 
>> > _______________________________________________
>> > MITgcm-devel mailing list
>> > MITgcm-devel at mitgcm.org
>> > http://mitgcm.org/mailman/listinfo/mitgcm-devel
>> 
>> Martin Losch
>> Alfred Wegener Institute 
>> Postfach 120161, 27515 Bremerhaven, Germany; 
>> Tel./Fax: ++49(0471)4831-1872/1797
>> 
>> 
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> 
> ---
> Patrick Heimbach | heimbach at mit.edu | http://www.mit.edu/~heimbach
> MIT | EAPS 54-1518 | 77 Massachusetts Ave | Cambridge MA 02139 USA
> FON +1-617-253-5259 | FAX +1-617-253-4464 | SKYPE patrick.heimbach
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