[MITgcm-devel] bling adjoint example

[Patrick Heimbach]

PS:
I forgot to ask: 
what type of error are you actually getting for the addummy_in_stepping problem?
p.

> On Sep 16, 2016, at 10:26 PM, Patrick Heimbach <heimbach at mit.edu> wrote:
> 
> Hi Matt,
> 
> please see inlined below.
> 
>> On Sep 14, 2016, at 4:38 PM, Matthew Mazloff <mmazloff at ucsd.edu> wrote:
>> 
>> Hello
>> 
>> I checked in a bling adjoint example. 
>> http://mitgcm.org/viewvc/MITgcm/MITgcm_contrib/verification_other/global_oce_biogeo_bling/code_ad/
>> 
>> Note two files in code_ad that I would rather not have there:
>> addummy_in_stepping.F
>> external_forcing_surf.F
>> 
>> In addummy_in_stepping.F
>> I had to comment out:
>> 152	cmm         CALL ADEXCH_UV_XY_RS( adFu, adFv, .TRUE., myThid )
>> 153	cmm         CALL ADEXCH_XY_RS( adQnet, myThid )
>> 154	cmm         CALL ADEXCH_XY_RS( adEmPmR, myThid )
>> is this a bug?
> 
> Not sure what's going on since this piece of code has been around for years, 
> but you may have stumbled over a wider problem
> (or it may be too late in the day and I am writing nonsense?):
> 
> Looking at the common block for addynvars_r that TAF generates
> (in file ad_taf_output.f), we get:
> 
>      common /addynvars_r/ etan_ad, uvel_ad, vvel_ad, wvel_ad, theta_ad,
>     $ salt_ad, gu_ad, gv_ad, gunm1_ad, gvnm1_ad, gtnm1_ad, gsnm1_ad
> 
> But looking at the common block we provide 
> (in pkg/autodiff/adcommon.h), it is:
>      common /addynvars_r/
>     &                     adetan,
>     &                     aduvel, advvel, adwvel,
>     &                     adtheta, adsalt,
>     &                     adgu, adgv, adgt, adgs,
> #ifdef ALLOW_ADAMSBASHFORTH_3
>     &                     adgunm, adgvnm, adgtnm, adgsnm
> #else
>     &                     adgunm1, adgvnm1, adgtnm1, adgsnm1
> #endif
> 
> Comparing the two, there are two entries missing in the
> new code that TAF generates: adgt, adgs, 
> (or rather, gt_ad, gs_ad ,in TAF's newer notation, doesn't matter).
> 
> What this means is we may be screwing up the memory by changing/omitting common block entries?
> That's not good (or, I can't see right away why this should be benign).
> 
>> In external_forcing_surf.F
>> I had to add 
>> 161	CMM(
>> 162	CADJ STORE EmPmR = comlev1, key = ikey_dynamics,  kind = isbyte
>> 163	CMM)
>> Can/should this be added to main code (perhaps with an ifdef ALLOW_BLING around it. Though I am surprised DIC doesn’t need this too.)
> 
> Hard to know without knowing details of bling.
> But seems fine with me to commit to main branch with the bracket you suggest.
> 
> Cheers
> -Patrick
> 
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> 
> 
> --------------------------------------------------------
> Patrick Heimbach, Ph.D. | http://heimbach.wordpress.com
> 
> * The University of Texas at Austin *
> The Institute for Computational Engineering and Sciences
> Institute for Geophysics | Jackson School of Geosciences
> 201 East 24th Street, POB 4.232 | Austin, TX 78712 | USA
> FON: +1-512-232-7694 | Email: heimbach at utexas.edu
> 
> * Massachusetts Institute of Technology *
> Department of Earth, Atmospheric, and Planetary Sciences
> 77 Massachusetts Ave, 54-1420 | Cambridge MA 02139 | USA
> FON: +1-617-253-5259 | Email: heimbach at mit.edu
> --------------------------------------------------------
> 
> 
> 
> 
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--------------------------------------------------------
Patrick Heimbach, Ph.D. | http://heimbach.wordpress.com

* The University of Texas at Austin *
The Institute for Computational Engineering and Sciences
Institute for Geophysics | Jackson School of Geosciences
201 East 24th Street, POB 4.232 | Austin, TX 78712 | USA
FON: +1-512-232-7694 | Email: heimbach at utexas.edu

* Massachusetts Institute of Technology *
Department of Earth, Atmospheric, and Planetary Sciences
77 Massachusetts Ave, 54-1420 | Cambridge MA 02139 | USA
FON: +1-617-253-5259 | Email: heimbach at mit.edu
--------------------------------------------------------




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