pkg/grdchk/grdchk_main.F

C
C $Header: /u/gcmpack/MITgcm/pkg/grdchk/grdchk_main.F,v 1.13 2004/02/23 19:16:16 heimbach Exp $
C $Name:  $

#include "AD_CONFIG.h"
#include "CPP_OPTIONS.h"

CBOI
C
C !TITLE: GRADIENT CHECK
C !AUTHORS: mitgcm developers ( support@mitgcm.org )
C !AFFILIATION: Massachussetts Institute of Technology
C !DATE:
C !INTRODUCTION: gradient check package
c \bv
c Compare the gradients calculated by the adjoint model with
c finite difference approximations.
c
C     !CALLING SEQUENCE:
c
c the_model_main
c |
c |-- ctrl_unpack
c |-- adthe_main_loop          - unperturbed cost function and
c |-- ctrl_pack                  adjoint gradient are computed here
c |
c |-- grdchk_main
c     |
c     |-- grdchk_init
c     |-- do icomp=...        - loop over control vector elements
c         |
c         |-- grdchk_loc      - determine location of icomp on grid
c         |
c         |-- grdchk_getxx    - get control vector component from file
c         |                     perturb it and write back to file
c         |-- grdchk_getadxx  - get gradient component calculated 
c         |                     via adjoint
c         |-- the_main_loop   - forward run and cost evaluation
c         |                     with perturbed control vector element
c         |-- calculate ratio of adj. vs. finite difference gradient
c         |
c         |-- grdchk_setxx    - Reset control vector element
c         |
c         |-- grdchk_print    - print results
c \ev
CEOI

CBOP
C     !ROUTINE: grdchk_main
C     !INTERFACE:
      subroutine grdchk_main( mythid )

C     !DESCRIPTION: \bv
c     ==================================================================
c     SUBROUTINE grdchk_main
c     ==================================================================
c     o Compare the gradients calculated by the adjoint model with
c       finite difference approximations.
c     started: Christian Eckert eckert@mit.edu 24-Feb-2000
c     continued&finished: heimbach@mit.edu: 13-Jun-2001
c     changed: mlosch@ocean.mit.edu: 09-May-2002
c              - added centered difference vs. 1-sided difference option
c              - improved output format for readability
c              - added control variable hFacC
c              heimbach@mit.edu 24-Feb-2003
c              - added tangent linear gradient checks
c              - fixes for multiproc. gradient checks
c              - added more control variables
c     
c     ==================================================================
c     SUBROUTINE grdchk_main
c     ==================================================================
C     \ev

C     !USES:
      implicit none

c     == global variables ==
#include "SIZE.h"
#include "EEPARAMS.h"
#include "PARAMS.h"
#include "grdchk.h"
#include "cost.h"
#ifdef ALLOW_TANGENTLINEAR_RUN
#include "g_cost.h"
#endif

C     !INPUT/OUTPUT PARAMETERS:
c     == routine arguments ==
      integer mythid 

#ifdef ALLOW_GRDCHK
C     !LOCAL VARIABLES:
c     == local variables ==
      integer myiter
      _RL     mytime 
      integer bi, itlo, ithi
      integer bj, jtlo, jthi
      integer i,  imin, imax
      integer j,  jmin, jmax
      integer k

      integer icomp
      integer ichknum
      integer icvrec
      integer jtile
      integer itile
      integer layer
      integer obcspos
      integer itilepos
      integer jtilepos
      integer itest
      integer ierr
      integer ierr_grdchk
      _RL     gfd
      _RL     fcref
      _RL     fcpertplus, fcpertminus
      _RL     ratio_ad
      _RL     ratio_ftl
      _RL     xxmemo_ref
      _RL     xxmemo_pert
      _RL     adxxmemo
      _RL     ftlxxmemo
      _RL     localEps
      _RL     grdchk_epsfac

      _RL tmpplot1(1-olx:snx+olx,1-oly:sny+oly,nr,nsx,nsy)
      _RL tmpplot2(1-olx:snx+olx,1-oly:sny+oly,nr,nsx,nsy)
      _RL tmpplot3(1-olx:snx+olx,1-oly:sny+oly,nr,nsx,nsy)

      CHARACTER*(MAX_LEN_MBUF) msgBuf

c     == end of interface ==
CEOP

c--   Set the loop ranges.
      jtlo = mybylo(mythid)
      jthi = mybyhi(mythid)
      itlo = mybxlo(mythid)
      ithi = mybxhi(mythid)
      jmin = 1
      jmax = sny
      imin = 1
      imax = snx

c--   initialise variables
      call grdchk_init( mythid )

c--   Compute the adjoint models' gradients.
c--   Compute the unperturbed cost function.
cph   Gradient via adjoint has already been computed,
cph   and so has unperturbed cost function,
cph   assuming all xx_ fields are initialised to zero.

      ierr_grdchk = 0
cphadmtlm(
      fcref = fc
cphadmtlm      fcref = objf_state_final(45,4,1,1)
cphadmtlm)

      print *, 'ph-check fcref = ', fcref

      do bj = jtlo, jthi
         do bi = itlo, ithi
            do k = 1, nr
               do j = jmin, jmax
                  do i = imin, imax
                     tmpplot1(i,j,k,bi,bj) = 0. _d 0
                     tmpplot2(i,j,k,bi,bj) = 0. _d 0
                     tmpplot3(i,j,k,bi,bj) = 0. _d 0
                  end do
               end do
            end do
         end do
      end do

      if ( useCentralDiff ) then
         grdchk_epsfac = 2. _d 0
      else
         grdchk_epsfac = 1. _d 0
      end if

      print *, 'grad-res -------------------------------'
      print ('(2a)'), 
     &     ' grad-res  proc    #    i    j    k            fc ref',
     &     '        fc + eps        fc - eps'
#ifdef ALLOW_TANGENTLINEAR_RUN
      print ('(2a)'), 
     &     ' grad-res  proc    #    i    j    k          tlm grad',
     &     '         fd grad      1 - fd/tlm'
#else
      print ('(2a)'), 
     &     ' grad-res  proc    #    i    j    k          adj grad',
     &     '         fd grad      1 - fd/adj'
#endif

c--   Compute the finite difference approximations.
c--   Cycle through all processes doing NINT(nend-nbeg+1)/nstep
c--   gradient checks.

      if ( nbeg .EQ. 0 ) call grdchk_get_position( mythid )

      do icomp = nbeg, nend, nstep

         ichknum = (icomp - nbeg)/nstep + 1

         if (ichknum .le. maxgrdchecks ) then

c--         Determine the location of icomp on the grid.
            if ( myProcId .EQ. grdchkwhichproc ) then
               call grdchk_loc( icomp, ichknum, 
     &              icvrec, itile, jtile, layer, obcspos,
     &              itilepos, jtilepos, itest, ierr,
     &              mythid )
            endif
            _BARRIER
              
c******************************************************
c--   (A): get gradient component calculated via adjoint
c******************************************************

c--   get gradient component calculated via adjoint
            if ( myProcId .EQ. grdchkwhichproc .AND.
     &           ierr .EQ. 0 ) then
               call grdchk_getadxx( icvrec,
     &              itile, jtile, layer,
     &              itilepos, jtilepos,
     &              adxxmemo, mythid )
            endif
            _BARRIER

#ifdef ALLOW_TANGENTLINEAR_RUN
c******************************************************
c--   (B): Get gradient component g_fc from tangent linear run:
c******************************************************
c--
c--   1. perturb control vector component: xx(i)=1.

            if ( myProcId .EQ. grdchkwhichproc .AND.
     &           ierr .EQ. 0 ) then
               localEps = 1. _d 0
               call grdchk_getxx( icvrec, TANGENT_SIMULATION,
     &              itile, jtile, layer,
     &              itilepos, jtilepos,
     &              xxmemo_ref, xxmemo_pert, localEps,
     &              mythid )
            endif
            _BARRIER

c--
c--   2. perform tangent linear run
            mytime = starttime
            myiter = niter0
cphadmtlm(
            g_fc = 0.
cphadmtlm            do j=1,sny
cphadmtlm               do i=1,snx
cphadmtlm                  g_objf_state_final(i,j,1,1) = 0.
cphadmtlm               enddo
cphadmtlm            enddo
cphadmtlm)
            call g_the_main_loop( mytime, myiter, mythid )
cphadmtlm(
            ftlxxmemo = g_fc
cphadmtlm            ftlxxmemo = g_objf_state_final(45,4,1,1)
cphadmtlm)
            _BARRIER
c--
c--   3. reset control vector
            if ( myProcId .EQ. grdchkwhichproc .AND.
     &           ierr .EQ. 0 ) then
               call grdchk_setxx( icvrec, TANGENT_SIMULATION,
     &              itile, jtile, layer,
     &              itilepos, jtilepos,
     &              xxmemo_ref, mythid )
            endif
            _BARRIER

#endif /* ALLOW_TANGENTLINEAR_RUN */


c******************************************************
c--   (C): Get gradient via finite difference perturbation
c******************************************************

c--   get control vector component from file
c--   perturb it and write back to file
c--   positive perturbation
            localEps = abs(grdchk_eps)
            if ( myProcId .EQ. grdchkwhichproc .AND.
     &           ierr .EQ. 0 ) then
               call grdchk_getxx( icvrec, FORWARD_SIMULATION,
     &              itile, jtile, layer,
     &              itilepos, jtilepos,
     &              xxmemo_ref, xxmemo_pert, localEps,
     &              mythid )
            endif
            _BARRIER
                     
c--   forward run with perturbed control vector
            mytime = starttime
            myiter = niter0
            call the_main_loop( mytime, myiter, mythid )
cphadmtlm(
            fcpertplus = fc
cphadmtlm            fcpertplus = objf_state_final(45,4,1,1)
cphadmtlm)
            print *, 'ph-check fcpertplus = ', fcpertplus
            _BARRIER
                  
c--   Reset control vector.
            if ( myProcId .EQ. grdchkwhichproc .AND.
     &           ierr .EQ. 0 ) then
               call grdchk_setxx( icvrec, FORWARD_SIMULATION,
     &              itile, jtile, layer,
     &              itilepos, jtilepos,
     &              xxmemo_ref, mythid )
            endif
            _BARRIER

            fcpertminus = fcref
            print *, 'ph-check fcpertminus = ', fcpertminus

            if ( useCentralDiff ) then

c--   get control vector component from file
c--   perturb it and write back to file
c--   repeat the proceedure for a negative perturbation
               if ( myProcId .EQ. grdchkwhichproc .AND.
     &           ierr .EQ. 0 ) then
                  localEps = - abs(grdchk_eps)
                  call grdchk_getxx( icvrec, FORWARD_SIMULATION,
     &                 itile, jtile, layer,
     &                 itilepos, jtilepos,
     &                 xxmemo_ref, xxmemo_pert, localEps,
     &                 mythid )
               endif
               _BARRIER
                     
c--   forward run with perturbed control vector
               mytime = starttime
               myiter = niter0
               call the_main_loop( mytime, myiter, mythid )
               _BARRIER
               fcpertminus = fc
                  
c--   Reset control vector.
               if ( myProcId .EQ. grdchkwhichproc .AND.
     &           ierr .EQ. 0 ) then
                  call grdchk_setxx( icvrec, FORWARD_SIMULATION,
     &                 itile, jtile, layer,
     &                 itilepos, jtilepos,
     &                 xxmemo_ref, mythid )
               endif
               _BARRIER

c-- end of if useCentralDiff ...
            end if

c******************************************************
c--   (D): calculate relative differences between gradients
c******************************************************

            if ( myProcId .EQ. grdchkwhichproc .AND.
     &           ierr .EQ. 0 ) then

               if ( grdchk_eps .eq. 0. ) then
                  gfd = (fcpertplus-fcpertminus)
               else
                  gfd = (fcpertplus-fcpertminus)
     &                 /(grdchk_epsfac*grdchk_eps)
               endif
                     
               if ( adxxmemo .eq. 0. ) then
                  ratio_ad = abs( adxxmemo - gfd )
               else
                  ratio_ad = 1. - gfd/adxxmemo
               endif

               if ( ftlxxmemo .eq. 0. ) then
                  ratio_ftl = abs( ftlxxmemo - gfd )
               else
                  ratio_ftl = 1. - gfd/ftlxxmemo
               endif
                  
               tmpplot1(itilepos,jtilepos,layer,itile,jtile)
     &              = gfd
               tmpplot2(itilepos,jtilepos,layer,itile,jtile)
     &              = ratio_ad
               tmpplot3(itilepos,jtilepos,layer,itile,jtile)
     &              = ratio_ftl

               fcrmem      ( ichknum ) = fcref
               fcppmem     ( ichknum ) = fcpertplus
               fcpmmem     ( ichknum ) = fcpertminus
               xxmemref    ( ichknum ) = xxmemo_ref
               xxmempert   ( ichknum ) = xxmemo_pert
               gfdmem      ( ichknum ) = gfd
               adxxmem     ( ichknum ) = adxxmemo
               ftlxxmem    ( ichknum ) = ftlxxmemo
               ratioadmem  ( ichknum ) = ratio_ad
               ratioftlmem ( ichknum ) = ratio_ftl

               irecmem   ( ichknum ) = icvrec
               bimem     ( ichknum ) = itile
               bjmem     ( ichknum ) = jtile
               ilocmem   ( ichknum ) = itilepos
               jlocmem   ( ichknum ) = jtilepos
               klocmem   ( ichknum ) = layer
               iobcsmem  ( ichknum ) = obcspos
               icompmem  ( ichknum ) = icomp
               ichkmem   ( ichknum ) = ichknum
               itestmem  ( ichknum ) = itest
               ierrmem   ( ichknum ) = ierr
                  
               print *, 'grad-res -------------------------------'
               print '(a,5I5,2x,3(1x,E15.9))', ' grad-res ',
     &              myprocid,ichknum,itilepos,jtilepos,layer,
     &              fcref, fcpertplus, fcpertminus
#ifdef ALLOW_TANGENTLINEAR_RUN
               print '(a,5I5,2x,3(1x,E15.9))', ' grad-res ',
     &              myprocid,ichknum,ichkmem(ichknum),
     &              icompmem(ichknum),itestmem(ichknum),
     &              ftlxxmemo, gfd, ratio_ftl
               WRITE(msgBuf,'(A34,2(1PE24.14,X))') 
     &              'precision_grdchk_result TLM ', fcref, ftlxxmemo
               CALL PRINT_MESSAGE
     &              (msgBuf,standardMessageUnit,SQUEEZE_RIGHT,1)
#else
               print '(a,5I5,2x,3(1x,E15.9))', ' grad-res ',
     &              myprocid,ichknum,ichkmem(ichknum),
     &              icompmem(ichknum),itestmem(ichknum),
     &              adxxmemo, gfd, ratio_ad
               WRITE(msgBuf,'(A34,2(1PE24.14,X))') 
     &              'precision_grdchk_result ADM ', fcref, adxxmemo
               CALL PRINT_MESSAGE
     &              (msgBuf,standardMessageUnit,SQUEEZE_RIGHT,1)
#endif

            endif

            print *, 'ph-grd  ierr ---------------------------'
            print *, 'ph-grd  ierr = ', ierr, ', icomp = ', icomp,
     &           ', ichknum = ', ichknum

            _BARRIER

c-- else of if ( ichknum ...
         else
            ierr_grdchk = -1

c-- end of if ( ichknum ... 
         endif

c-- end of do icomp = ... 
      enddo

      if ( myProcId .EQ. grdchkwhichproc ) then
         CALL WRITE_REC_XYZ_RL( 
     &        'grd_findiff'   , tmpplot1, 1, 0, myThid)
         CALL WRITE_REC_XYZ_RL( 
     &        'grd_ratio_ad'  , tmpplot2, 1, 0, myThid)
         CALL WRITE_REC_XYZ_RL( 
     &        'grd_ratio_ftl' , tmpplot3, 1, 0, myThid)
      endif

c--   Everyone has to wait for the component to be reset.
      _BARRIER

c--   Print the results of the gradient check.
      call grdchk_print( ichknum, ierr_grdchk, mythid )

#endif /* ALLOW_GRDCHK */

      end
1	edhill	1.10	C
2	heimbach	1.14	C $Header: /u/gcmpack/MITgcm/pkg/grdchk/grdchk_main.F,v 1.13 2004/02/23 19:16:16 heimbach Exp $
3	heimbach	1.11	C $Name: $
4	heimbach	1.2
5	edhill	1.10	#include "AD_CONFIG.h"
6	heimbach	1.2	#include "CPP_OPTIONS.h"
7
8	heimbach	1.3	CBOI
9			C
10			C !TITLE: GRADIENT CHECK
11			C !AUTHORS: mitgcm developers ( support@mitgcm.org )
12			C !AFFILIATION: Massachussetts Institute of Technology
13			C !DATE:
14			C !INTRODUCTION: gradient check package
15			c \bv
16			c Compare the gradients calculated by the adjoint model with
17			c finite difference approximations.
18			c
19			C !CALLING SEQUENCE:
20			c
21			c the_model_main
22			c \|
23			c \|-- ctrl_unpack
24			c \|-- adthe_main_loop - unperturbed cost function and
25			c \|-- ctrl_pack adjoint gradient are computed here
26			c \|
27			c \|-- grdchk_main
28			c \|
29			c \|-- grdchk_init
30			c \|-- do icomp=... - loop over control vector elements
31			c \|
32			c \|-- grdchk_loc - determine location of icomp on grid
33			c \|
34			c \|-- grdchk_getxx - get control vector component from file
35			c \| perturb it and write back to file
36			c \|-- grdchk_getadxx - get gradient component calculated
37			c \| via adjoint
38			c \|-- the_main_loop - forward run and cost evaluation
39			c \| with perturbed control vector element
40			c \|-- calculate ratio of adj. vs. finite difference gradient
41			c \|
42			c \|-- grdchk_setxx - Reset control vector element
43			c \|
44			c \|-- grdchk_print - print results
45			c \ev
46			CEOI
47
48			CBOP
49			C !ROUTINE: grdchk_main
50			C !INTERFACE:
51			subroutine grdchk_main( mythid )
52	heimbach	1.2
53	heimbach	1.3	C !DESCRIPTION: \bv
54	heimbach	1.2	c ==================================================================
55			c SUBROUTINE grdchk_main
56			c ==================================================================
57			c o Compare the gradients calculated by the adjoint model with
58			c finite difference approximations.
59			c started: Christian Eckert eckert@mit.edu 24-Feb-2000
60	heimbach	1.4	c continued&finished: heimbach@mit.edu: 13-Jun-2001
61			c changed: mlosch@ocean.mit.edu: 09-May-2002
62			c - added centered difference vs. 1-sided difference option
63			c - improved output format for readability
64			c - added control variable hFacC
65	heimbach	1.7	c heimbach@mit.edu 24-Feb-2003
66			c - added tangent linear gradient checks
67			c - fixes for multiproc. gradient checks
68			c - added more control variables
69	heimbach	1.4	c
70	heimbach	1.2	c ==================================================================
71			c SUBROUTINE grdchk_main
72			c ==================================================================
73	heimbach	1.3	C \ev
74	heimbach	1.2
75	heimbach	1.3	C !USES:
76	heimbach	1.2	implicit none
77
78			c == global variables ==
79			#include "SIZE.h"
80			#include "EEPARAMS.h"
81			#include "PARAMS.h"
82			#include "grdchk.h"
83			#include "cost.h"
84	heimbach	1.9	#ifdef ALLOW_TANGENTLINEAR_RUN
85			#include "g_cost.h"
86			#endif
87	heimbach	1.2
88	heimbach	1.3	C !INPUT/OUTPUT PARAMETERS:
89	heimbach	1.2	c == routine arguments ==
90			integer mythid
91
92	heimbach	1.11	#ifdef ALLOW_GRDCHK
93	heimbach	1.3	C !LOCAL VARIABLES:
94	heimbach	1.2	c == local variables ==
95			integer myiter
96			_RL mytime
97			integer bi, itlo, ithi
98			integer bj, jtlo, jthi
99			integer i, imin, imax
100			integer j, jmin, jmax
101			integer k
102
103			integer icomp
104			integer ichknum
105			integer icvrec
106			integer jtile
107			integer itile
108			integer layer
109	heimbach	1.8	integer obcspos
110	heimbach	1.2	integer itilepos
111			integer jtilepos
112			integer itest
113			integer ierr
114			integer ierr_grdchk
115			_RL gfd
116			_RL fcref
117	heimbach	1.4	_RL fcpertplus, fcpertminus
118	heimbach	1.6	_RL ratio_ad
119			_RL ratio_ftl
120	heimbach	1.2	_RL xxmemo_ref
121			_RL xxmemo_pert
122			_RL adxxmemo
123	heimbach	1.6	_RL ftlxxmemo
124			_RL localEps
125			_RL grdchk_epsfac
126
127	heimbach	1.7	_RL tmpplot1(1-olx:snx+olx,1-oly:sny+oly,nr,nsx,nsy)
128			_RL tmpplot2(1-olx:snx+olx,1-oly:sny+oly,nr,nsx,nsy)
129			_RL tmpplot3(1-olx:snx+olx,1-oly:sny+oly,nr,nsx,nsy)
130
131	heimbach	1.12	CHARACTER*(MAX_LEN_MBUF) msgBuf
132
133	heimbach	1.2	c == end of interface ==
134	heimbach	1.3	CEOP
135	heimbach	1.2
136			c-- Set the loop ranges.
137			jtlo = mybylo(mythid)
138			jthi = mybyhi(mythid)
139			itlo = mybxlo(mythid)
140			ithi = mybxhi(mythid)
141			jmin = 1
142			jmax = sny
143			imin = 1
144			imax = snx
145
146			c-- initialise variables
147			call grdchk_init( mythid )
148
149			c-- Compute the adjoint models' gradients.
150			c-- Compute the unperturbed cost function.
151	heimbach	1.7	cph Gradient via adjoint has already been computed,
152			cph and so has unperturbed cost function,
153			cph assuming all xx_ fields are initialised to zero.
154	heimbach	1.2
155	heimbach	1.9	ierr_grdchk = 0
156			cphadmtlm(
157	heimbach	1.2	fcref = fc
158	heimbach	1.9	cphadmtlm fcref = objf_state_final(45,4,1,1)
159			cphadmtlm)
160
161			print *, 'ph-check fcref = ', fcref
162	heimbach	1.2
163			do bj = jtlo, jthi
164			do bi = itlo, ithi
165			do k = 1, nr
166			do j = jmin, jmax
167			do i = imin, imax
168			tmpplot1(i,j,k,bi,bj) = 0. _d 0
169			tmpplot2(i,j,k,bi,bj) = 0. _d 0
170	heimbach	1.6	tmpplot3(i,j,k,bi,bj) = 0. _d 0
171	heimbach	1.2	end do
172			end do
173			end do
174			end do
175			end do
176
177	heimbach	1.4	if ( useCentralDiff ) then
178			grdchk_epsfac = 2. _d 0
179			else
180			grdchk_epsfac = 1. _d 0
181			end if
182
183	heimbach	1.12	print *, 'grad-res -------------------------------'
184	heimbach	1.7	print ('(2a)'),
185	heimbach	1.12	& ' grad-res proc # i j k fc ref',
186	heimbach	1.7	& ' fc + eps fc - eps'
187			#ifdef ALLOW_TANGENTLINEAR_RUN
188			print ('(2a)'),
189	heimbach	1.12	& ' grad-res proc # i j k tlm grad',
190	heimbach	1.7	& ' fd grad 1 - fd/tlm'
191			#else
192			print ('(2a)'),
193	heimbach	1.12	& ' grad-res proc # i j k adj grad',
194	heimbach	1.7	& ' fd grad 1 - fd/adj'
195			#endif
196
197	heimbach	1.2	c-- Compute the finite difference approximations.
198			c-- Cycle through all processes doing NINT(nend-nbeg+1)/nstep
199			c-- gradient checks.
200	heimbach	1.14
201			if ( nbeg .EQ. 0 ) call grdchk_get_position( mythid )
202	heimbach	1.2
203	heimbach	1.7	do icomp = nbeg, nend, nstep
204	heimbach	1.2
205	heimbach	1.7	ichknum = (icomp - nbeg)/nstep + 1
206	heimbach	1.2
207	heimbach	1.7	if (ichknum .le. maxgrdchecks ) then
208	heimbach	1.2
209	heimbach	1.7	c-- Determine the location of icomp on the grid.
210			if ( myProcId .EQ. grdchkwhichproc ) then
211			call grdchk_loc( icomp, ichknum,
212	heimbach	1.8	& icvrec, itile, jtile, layer, obcspos,
213	heimbach	1.7	& itilepos, jtilepos, itest, ierr,
214			& mythid )
215			endif
216			_BARRIER
217	heimbach	1.2
218	heimbach	1.6	c******************************************************
219			c-- (A): get gradient component calculated via adjoint
220			c******************************************************
221	heimbach	1.7
222			c-- get gradient component calculated via adjoint
223			if ( myProcId .EQ. grdchkwhichproc .AND.
224			& ierr .EQ. 0 ) then
225			call grdchk_getadxx( icvrec,
226			& itile, jtile, layer,
227			& itilepos, jtilepos,
228			& adxxmemo, mythid )
229			endif
230			_BARRIER
231	heimbach	1.4
232	heimbach	1.6	#ifdef ALLOW_TANGENTLINEAR_RUN
233			c******************************************************
234			c-- (B): Get gradient component g_fc from tangent linear run:
235			c******************************************************
236			c--
237			c-- 1. perturb control vector component: xx(i)=1.
238
239	heimbach	1.7	if ( myProcId .EQ. grdchkwhichproc .AND.
240			& ierr .EQ. 0 ) then
241			localEps = 1. _d 0
242			call grdchk_getxx( icvrec, TANGENT_SIMULATION,
243			& itile, jtile, layer,
244			& itilepos, jtilepos,
245			& xxmemo_ref, xxmemo_pert, localEps,
246			& mythid )
247			endif
248			_BARRIER
249	heimbach	1.6
250			c--
251			c-- 2. perform tangent linear run
252	heimbach	1.7	mytime = starttime
253			myiter = niter0
254	heimbach	1.9	cphadmtlm(
255	heimbach	1.7	g_fc = 0.
256	heimbach	1.9	cphadmtlm do j=1,sny
257			cphadmtlm do i=1,snx
258			cphadmtlm g_objf_state_final(i,j,1,1) = 0.
259			cphadmtlm enddo
260			cphadmtlm enddo
261			cphadmtlm)
262	heimbach	1.7	call g_the_main_loop( mytime, myiter, mythid )
263	heimbach	1.9	cphadmtlm(
264	heimbach	1.7	ftlxxmemo = g_fc
265	heimbach	1.9	cphadmtlm ftlxxmemo = g_objf_state_final(45,4,1,1)
266			cphadmtlm)
267	heimbach	1.7	_BARRIER
268	heimbach	1.6	c--
269			c-- 3. reset control vector
270	heimbach	1.7	if ( myProcId .EQ. grdchkwhichproc .AND.
271			& ierr .EQ. 0 ) then
272			call grdchk_setxx( icvrec, TANGENT_SIMULATION,
273			& itile, jtile, layer,
274			& itilepos, jtilepos,
275			& xxmemo_ref, mythid )
276			endif
277			_BARRIER
278
279			#endif /* ALLOW_TANGENTLINEAR_RUN */
280
281	heimbach	1.6
282			c******************************************************
283			c-- (C): Get gradient via finite difference perturbation
284			c******************************************************
285
286	heimbach	1.2	c-- get control vector component from file
287	heimbach	1.7	c-- perturb it and write back to file
288	heimbach	1.6	c-- positive perturbation
289	heimbach	1.7	localEps = abs(grdchk_eps)
290			if ( myProcId .EQ. grdchkwhichproc .AND.
291			& ierr .EQ. 0 ) then
292			call grdchk_getxx( icvrec, FORWARD_SIMULATION,
293			& itile, jtile, layer,
294			& itilepos, jtilepos,
295			& xxmemo_ref, xxmemo_pert, localEps,
296			& mythid )
297			endif
298			_BARRIER
299	heimbach	1.2
300	heimbach	1.4	c-- forward run with perturbed control vector
301	heimbach	1.7	mytime = starttime
302			myiter = niter0
303			call the_main_loop( mytime, myiter, mythid )
304	heimbach	1.9	cphadmtlm(
305	heimbach	1.7	fcpertplus = fc
306	heimbach	1.9	cphadmtlm fcpertplus = objf_state_final(45,4,1,1)
307			cphadmtlm)
308	heimbach	1.13	print *, 'ph-check fcpertplus = ', fcpertplus
309	heimbach	1.7	_BARRIER
310	heimbach	1.4
311			c-- Reset control vector.
312	heimbach	1.7	if ( myProcId .EQ. grdchkwhichproc .AND.
313			& ierr .EQ. 0 ) then
314			call grdchk_setxx( icvrec, FORWARD_SIMULATION,
315			& itile, jtile, layer,
316			& itilepos, jtilepos,
317			& xxmemo_ref, mythid )
318			endif
319			_BARRIER
320	heimbach	1.2
321	heimbach	1.7	fcpertminus = fcref
322	heimbach	1.13	print *, 'ph-check fcpertminus = ', fcpertminus
323	heimbach	1.4
324	heimbach	1.7	if ( useCentralDiff ) then
325	heimbach	1.4
326	heimbach	1.6	c-- get control vector component from file
327	heimbach	1.7	c-- perturb it and write back to file
328	heimbach	1.4	c-- repeat the proceedure for a negative perturbation
329	heimbach	1.7	if ( myProcId .EQ. grdchkwhichproc .AND.
330			& ierr .EQ. 0 ) then
331			localEps = - abs(grdchk_eps)
332			call grdchk_getxx( icvrec, FORWARD_SIMULATION,
333			& itile, jtile, layer,
334			& itilepos, jtilepos,
335			& xxmemo_ref, xxmemo_pert, localEps,
336			& mythid )
337			endif
338			_BARRIER
339	heimbach	1.4
340	heimbach	1.2	c-- forward run with perturbed control vector
341	heimbach	1.7	mytime = starttime
342			myiter = niter0
343			call the_main_loop( mytime, myiter, mythid )
344			_BARRIER
345			fcpertminus = fc
346	heimbach	1.2
347	heimbach	1.4	c-- Reset control vector.
348	heimbach	1.7	if ( myProcId .EQ. grdchkwhichproc .AND.
349			& ierr .EQ. 0 ) then
350			call grdchk_setxx( icvrec, FORWARD_SIMULATION,
351			& itile, jtile, layer,
352			& itilepos, jtilepos,
353			& xxmemo_ref, mythid )
354			endif
355			_BARRIER
356
357			c-- end of if useCentralDiff ...
358			end if
359	heimbach	1.4
360	heimbach	1.6	c******************************************************
361			c-- (D): calculate relative differences between gradients
362			c******************************************************
363
364	heimbach	1.7	if ( myProcId .EQ. grdchkwhichproc .AND.
365			& ierr .EQ. 0 ) then
366	heimbach	1.2
367	heimbach	1.7	if ( grdchk_eps .eq. 0. ) then
368			gfd = (fcpertplus-fcpertminus)
369			else
370			gfd = (fcpertplus-fcpertminus)
371			& /(grdchk_epsfac*grdchk_eps)
372			endif
373	heimbach	1.2
374	heimbach	1.7	if ( adxxmemo .eq. 0. ) then
375			ratio_ad = abs( adxxmemo - gfd )
376			else
377			ratio_ad = 1. - gfd/adxxmemo
378			endif
379
380			if ( ftlxxmemo .eq. 0. ) then
381			ratio_ftl = abs( ftlxxmemo - gfd )
382	heimbach	1.2	else
383	heimbach	1.7	ratio_ftl = 1. - gfd/ftlxxmemo
384	heimbach	1.2	endif
385	heimbach	1.7
386			tmpplot1(itilepos,jtilepos,layer,itile,jtile)
387			& = gfd
388			tmpplot2(itilepos,jtilepos,layer,itile,jtile)
389			& = ratio_ad
390			tmpplot3(itilepos,jtilepos,layer,itile,jtile)
391			& = ratio_ftl
392
393			fcrmem ( ichknum ) = fcref
394			fcppmem ( ichknum ) = fcpertplus
395			fcpmmem ( ichknum ) = fcpertminus
396			xxmemref ( ichknum ) = xxmemo_ref
397			xxmempert ( ichknum ) = xxmemo_pert
398			gfdmem ( ichknum ) = gfd
399			adxxmem ( ichknum ) = adxxmemo
400			ftlxxmem ( ichknum ) = ftlxxmemo
401			ratioadmem ( ichknum ) = ratio_ad
402			ratioftlmem ( ichknum ) = ratio_ftl
403
404			irecmem ( ichknum ) = icvrec
405			bimem ( ichknum ) = itile
406			bjmem ( ichknum ) = jtile
407			ilocmem ( ichknum ) = itilepos
408			jlocmem ( ichknum ) = jtilepos
409			klocmem ( ichknum ) = layer
410	heimbach	1.8	iobcsmem ( ichknum ) = obcspos
411	heimbach	1.7	icompmem ( ichknum ) = icomp
412			ichkmem ( ichknum ) = ichknum
413			itestmem ( ichknum ) = itest
414			ierrmem ( ichknum ) = ierr
415
416	heimbach	1.12	print *, 'grad-res -------------------------------'
417			print '(a,5I5,2x,3(1x,E15.9))', ' grad-res ',
418	heimbach	1.7	& myprocid,ichknum,itilepos,jtilepos,layer,
419			& fcref, fcpertplus, fcpertminus
420			#ifdef ALLOW_TANGENTLINEAR_RUN
421	heimbach	1.12	print '(a,5I5,2x,3(1x,E15.9))', ' grad-res ',
422	heimbach	1.7	& myprocid,ichknum,ichkmem(ichknum),
423			& icompmem(ichknum),itestmem(ichknum),
424			& ftlxxmemo, gfd, ratio_ftl
425	heimbach	1.12	WRITE(msgBuf,'(A34,2(1PE24.14,X))')
426			& 'precision_grdchk_result TLM ', fcref, ftlxxmemo
427			CALL PRINT_MESSAGE
428			& (msgBuf,standardMessageUnit,SQUEEZE_RIGHT,1)
429	heimbach	1.7	#else
430	heimbach	1.12	print '(a,5I5,2x,3(1x,E15.9))', ' grad-res ',
431	heimbach	1.7	& myprocid,ichknum,ichkmem(ichknum),
432			& icompmem(ichknum),itestmem(ichknum),
433			& adxxmemo, gfd, ratio_ad
434	heimbach	1.12	WRITE(msgBuf,'(A34,2(1PE24.14,X))')
435			& 'precision_grdchk_result ADM ', fcref, adxxmemo
436			CALL PRINT_MESSAGE
437			& (msgBuf,standardMessageUnit,SQUEEZE_RIGHT,1)
438	heimbach	1.7	#endif
439
440			endif
441
442			print *, 'ph-grd ierr ---------------------------'
443			print *, 'ph-grd ierr = ', ierr, ', icomp = ', icomp,
444			& ', ichknum = ', ichknum
445
446			_BARRIER
447
448			c-- else of if ( ichknum ...
449			else
450			ierr_grdchk = -1
451
452			c-- end of if ( ichknum ...
453	heimbach	1.2	endif
454
455	heimbach	1.7	c-- end of do icomp = ...
456			enddo
457	heimbach	1.2
458	heimbach	1.7	if ( myProcId .EQ. grdchkwhichproc ) then
459			CALL WRITE_REC_XYZ_RL(
460			& 'grd_findiff' , tmpplot1, 1, 0, myThid)
461			CALL WRITE_REC_XYZ_RL(
462			& 'grd_ratio_ad' , tmpplot2, 1, 0, myThid)
463			CALL WRITE_REC_XYZ_RL(
464			& 'grd_ratio_ftl' , tmpplot3, 1, 0, myThid)
465			endif
466	heimbach	1.2
467	heimbach	1.7	c-- Everyone has to wait for the component to be reset.
468			_BARRIER
469	heimbach	1.2
470			c-- Print the results of the gradient check.
471			call grdchk_print( ichknum, ierr_grdchk, mythid )
472
473	heimbach	1.11	#endif /* ALLOW_GRDCHK */
474	heimbach	1.2
475			end