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C $Header: /u/gcmpack/MITgcm/model/src/cg3d.F,v 1.23 2010/01/17 21:55:48 jmc Exp $ |
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C $Name: $ |
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|
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#include "CPP_OPTIONS.h" |
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#ifdef TARGET_NEC_SX |
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C set a sensible default for the outer loop unrolling parameter that can |
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C be overriden in the Makefile with the DEFINES macro or in CPP_OPTIONS.h |
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#ifndef CG3D_OUTERLOOPITERS |
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# define CG3D_OUTERLOOPITERS 10 |
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#endif |
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#endif /* TARGET_NEC_SX */ |
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|
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CBOP |
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C !ROUTINE: CG3D |
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C !INTERFACE: |
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SUBROUTINE CG3D( |
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I cg3d_b, |
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U cg3d_x, |
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O firstResidual, |
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O lastResidual, |
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U numIters, |
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I myIter, myThid ) |
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C !DESCRIPTION: \bv |
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C *==========================================================* |
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C | SUBROUTINE CG3D |
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C | o Three-dimensional grid problem conjugate-gradient |
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C | inverter (with preconditioner). |
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C *==========================================================* |
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C | Con. grad is an iterative procedure for solving Ax = b. |
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C | It requires the A be symmetric. |
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C | This implementation assumes A is a seven-diagonal |
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C | matrix of the form that arises in the discrete |
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C | representation of the del^2 operator in a |
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C | three-dimensional space. |
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C | Notes: |
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C | ====== |
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C | This implementation can support shared-memory |
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C | multi-threaded execution. In order to do this COMMON |
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C | blocks are used for many of the arrays - even ones that |
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C | are only used for intermedaite results. This design is |
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C | OK if you want to all the threads to collaborate on |
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C | solving the same problem. On the other hand if you want |
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C | the threads to solve several different problems |
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C | concurrently this implementation will not work. |
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C *==========================================================* |
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C \ev |
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|
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C !USES: |
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IMPLICIT NONE |
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C === Global data === |
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#include "SIZE.h" |
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#include "EEPARAMS.h" |
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#include "PARAMS.h" |
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#include "GRID.h" |
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#include "SURFACE.h" |
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#include "CG3D.h" |
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|
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C !INPUT/OUTPUT PARAMETERS: |
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C === Routine arguments === |
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C cg3d_b :: The source term or "right hand side" |
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C cg3d_x :: The solution |
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C firstResidual :: the initial residual before any iterations |
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C lastResidual :: the actual residual reached |
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C numIters :: Entry: the maximum number of iterations allowed |
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C :: Exit: the actual number of iterations used |
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C myIter :: Current iteration number in simulation |
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C myThid :: my Thread Id number |
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_RL cg3d_b(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy) |
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_RL cg3d_x(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy) |
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_RL firstResidual |
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_RL lastResidual |
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INTEGER numIters |
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INTEGER myIter |
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INTEGER myThid |
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|
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#ifdef ALLOW_NONHYDROSTATIC |
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|
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C !LOCAL VARIABLES: |
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C === Local variables ==== |
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C actualIts :: Number of iterations taken |
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C actualResidual :: residual |
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C bi,bj :: tile indices |
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C eta_qrN :: Used in computing search directions |
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C eta_qrNM1 suffix N and NM1 denote current and |
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C cgBeta previous iterations respectively. |
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C alpha |
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C sumRHS :: Sum of right-hand-side. Sometimes this is a |
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C useful debuggin/trouble shooting diagnostic. |
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C For neumann problems sumRHS needs to be ~0. |
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C or they converge at a non-zero residual. |
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C err :: Measure of residual of Ax - b, usually the norm. |
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C i, j, k :: Loop counters |
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C it3d :: Loop counter for CG iterations |
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C msgBuf :: Informational/error message buffer |
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INTEGER actualIts |
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_RL actualResidual |
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INTEGER bi, bj |
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INTEGER i, j, k, it3d |
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INTEGER km1, kp1 |
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_RL maskM1, maskP1 |
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_RL err, errTile(nSx,nSy) |
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_RL eta_qrN,eta_qrNtile(nSx,nSy) |
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_RL eta_qrNM1 |
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_RL cgBeta |
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_RL alpha , alphaTile(nSx,nSy) |
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_RL sumRHS, sumRHStile(nSx,nSy) |
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_RL rhsMax |
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_RL rhsNorm |
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CHARACTER*(MAX_LEN_MBUF) msgBuf |
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LOGICAL printResidual |
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_RL surfFac |
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#ifdef NONLIN_FRSURF |
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INTEGER ks |
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_RL surfTerm(sNx,sNy) |
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#endif /* NONLIN_FRSURF */ |
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CEOP |
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|
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IF ( select_rStar .NE. 0 ) THEN |
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surfFac = freeSurfFac |
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ELSE |
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surfFac = 0. |
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ENDIF |
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#ifdef NONLIN_FRSURF |
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DO j=1,sNy |
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DO i=1,sNx |
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surfTerm(i,j) = 0. |
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ENDDO |
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ENDDO |
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#endif /* NONLIN_FRSURF */ |
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|
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C-- Initialise inverter |
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eta_qrNM1 = 1. _d 0 |
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|
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C-- Normalise RHS |
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rhsMax = 0. _d 0 |
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DO bj=myByLo(myThid),myByHi(myThid) |
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DO bi=myBxLo(myThid),myBxHi(myThid) |
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DO k=1,Nr |
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DO j=1,sNy |
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DO i=1,sNx |
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cg3d_b(i,j,k,bi,bj) = cg3d_b(i,j,k,bi,bj)*cg3dNorm |
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& * maskC(i,j,k,bi,bj) |
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rhsMax = MAX(ABS(cg3d_b(i,j,k,bi,bj)),rhsMax) |
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ENDDO |
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ENDDO |
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ENDDO |
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ENDDO |
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ENDDO |
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_GLOBAL_MAX_RL( rhsMax, myThid ) |
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rhsNorm = 1. _d 0 |
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IF ( rhsMax .NE. 0. ) rhsNorm = 1. _d 0 / rhsMax |
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DO bj=myByLo(myThid),myByHi(myThid) |
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DO bi=myBxLo(myThid),myBxHi(myThid) |
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DO k=1,Nr |
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DO j=1,sNy |
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DO i=1,sNx |
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cg3d_b(i,j,k,bi,bj) = cg3d_b(i,j,k,bi,bj)*rhsNorm |
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cg3d_x(i,j,k,bi,bj) = cg3d_x(i,j,k,bi,bj)*rhsNorm |
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ENDDO |
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ENDDO |
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ENDDO |
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ENDDO |
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ENDDO |
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|
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C-- Update overlaps |
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c _EXCH_XYZ_RL( cg3d_b, myThid ) |
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_EXCH_XYZ_RL( cg3d_x, myThid ) |
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|
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C-- Initial residual calculation (with free-Surface term) |
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err = 0. _d 0 |
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sumRHS = 0. _d 0 |
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DO bj=myByLo(myThid),myByHi(myThid) |
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DO bi=myBxLo(myThid),myBxHi(myThid) |
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errTile(bi,bj) = 0. _d 0 |
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sumRHStile(bi,bj) = 0. _d 0 |
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#ifdef NONLIN_FRSURF |
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IF ( select_rStar .NE. 0 ) THEN |
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DO j=1,sNy |
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DO i=1,sNx |
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surfTerm(i,j) = 0. |
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ENDDO |
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ENDDO |
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DO k=1,Nr |
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DO j=1,sNy |
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DO i=1,sNx |
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surfTerm(i,j) = surfTerm(i,j) |
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& +cg3d_x(i,j,k,bi,bj)*drF(k)*h0FacC(i,j,k,bi,bj) |
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ENDDO |
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ENDDO |
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ENDDO |
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DO j=1,sNy |
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DO i=1,sNx |
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ks = kSurfC(i,j,bi,bj) |
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surfTerm(i,j) = surfTerm(i,j)*cg3dNorm |
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& *recip_Rcol(i,j,bi,bj)*recip_Rcol(i,j,bi,bj) |
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& *rA(i,j,bi,bj)*deepFac2F(ks) |
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& *recip_Bo(i,j,bi,bj)/deltaTMom/deltaTfreesurf |
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ENDDO |
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ENDDO |
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ENDIF |
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#endif /* NONLIN_FRSURF */ |
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DO k=1,Nr |
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km1 = MAX(k-1, 1 ) |
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kp1 = MIN(k+1, Nr) |
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maskM1 = 1. _d 0 |
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maskP1 = 1. _d 0 |
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IF ( k .EQ. 1 ) maskM1 = 0. _d 0 |
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IF ( k .EQ. Nr) maskP1 = 0. _d 0 |
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#ifdef TARGET_NEC_SX |
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!CDIR OUTERUNROLL=CG3D_OUTERLOOPITERS |
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#endif /* TARGET_NEC_SX */ |
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DO j=1,sNy |
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DO i=1,sNx |
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cg3d_r(i,j,k,bi,bj) = cg3d_b(i,j,k,bi,bj) |
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& -( 0. |
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& +aW3d( i, j, k, bi,bj)*cg3d_x(i-1,j, k, bi,bj) |
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& +aW3d(i+1,j, k, bi,bj)*cg3d_x(i+1,j, k, bi,bj) |
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& +aS3d( i, j, k, bi,bj)*cg3d_x( i,j-1,k, bi,bj) |
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& +aS3d( i,j+1,k, bi,bj)*cg3d_x( i,j+1,k, bi,bj) |
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& +aV3d( i, j, k, bi,bj)*cg3d_x( i, j,km1,bi,bj)*maskM1 |
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& +aV3d( i, j,kp1,bi,bj)*cg3d_x( i, j,kp1,bi,bj)*maskP1 |
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& +aC3d( i, j, k, bi,bj)*cg3d_x( i, j, k, bi,bj) |
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#ifdef NONLIN_FRSURF |
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& -surfFac*surfTerm(i,j)*drF(k)*h0FacC(i,j,k,bi,bj) |
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#endif /* NONLIN_FRSURF */ |
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& ) |
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errTile(bi,bj) = errTile(bi,bj) |
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& +cg3d_r(i,j,k,bi,bj)*cg3d_r(i,j,k,bi,bj) |
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sumRHStile(bi,bj) = sumRHStile(bi,bj)+cg3d_b(i,j,k,bi,bj) |
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ENDDO |
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ENDDO |
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DO J=1-1,sNy+1 |
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DO I=1-1,sNx+1 |
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cg3d_s(i,j,k,bi,bj) = 0. |
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ENDDO |
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ENDDO |
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ENDDO |
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ENDDO |
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ENDDO |
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CALL EXCH_S3D_RL( cg3d_r, Nr, myThid ) |
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c CALL EXCH_S3D_RL( cg3d_s, Nr, myThid ) |
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CALL GLOBAL_SUM_TILE_RL( sumRHStile, sumRHS, myThid ) |
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CALL GLOBAL_SUM_TILE_RL( errTile, err, myThid ) |
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IF ( debugLevel.GE.debLevC .AND. diagFreq.GT.0. ) THEN |
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CALL WRITE_FLD_S3D_RL( |
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I 'cg3d_r_I', 'I10', 1, Nr, cg3d_r, myIter, myThid ) |
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ENDIF |
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|
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printResidual = .FALSE. |
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IF ( debugLevel .GE. debLevZero ) THEN |
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_BEGIN_MASTER( myThid ) |
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printResidual = printResidualFreq.GE.1 |
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WRITE(standardmessageunit,'(A,1P2E22.14)') |
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& ' cg3d: Sum(rhs),rhsMax = ',sumRHS,rhsMax |
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_END_MASTER( myThid ) |
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ENDIF |
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|
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actualIts = 0 |
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actualResidual = SQRT(err) |
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firstResidual=actualResidual |
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|
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C >>>>>>>>>>>>>>> BEGIN SOLVER <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< |
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DO 10 it3d=1, numIters |
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|
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IF ( actualResidual .LT. cg3dTargetResidual ) GOTO 11 |
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C-- Solve preconditioning equation and update |
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C-- conjugate direction vector "s". |
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C Note. On the next two loops over all tiles the inner loop ranges |
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C in sNx and sNy are expanded by 1 to avoid a communication |
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C step. However this entails a bit of gynamastics because we only |
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C want eta_qrN for the interior points. |
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eta_qrN = 0. _d 0 |
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DO bj=myByLo(myThid),myByHi(myThid) |
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DO bi=myBxLo(myThid),myBxHi(myThid) |
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eta_qrNtile(bi,bj) = 0. _d 0 |
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DO k=1,1 |
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#ifdef TARGET_NEC_SX |
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!CDIR OUTERUNROLL=CG3D_OUTERLOOPITERS |
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#endif /* TARGET_NEC_SX */ |
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DO j=1-1,sNy+1 |
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DO i=1-1,sNx+1 |
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cg3d_q(i,j,k,bi,bj) = zMC(i,j,k,bi,bj) |
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& *cg3d_r(i,j,k,bi,bj) |
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ENDDO |
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ENDDO |
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ENDDO |
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DO k=2,Nr |
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#ifdef TARGET_NEC_SX |
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!CDIR OUTERUNROLL=CG3D_OUTERLOOPITERS |
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#endif /* TARGET_NEC_SX */ |
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DO j=1-1,sNy+1 |
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DO i=1-1,sNx+1 |
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cg3d_q(i,j,k,bi,bj) = zMC(i,j,k,bi,bj) |
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& *( cg3d_r(i,j,k,bi,bj) |
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& -zML(i,j,k,bi,bj)*cg3d_q(i,j,k-1,bi,bj) |
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& ) |
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ENDDO |
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ENDDO |
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ENDDO |
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DO k=Nr,Nr |
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#ifdef TARGET_NEC_SX |
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!CDIR OUTERUNROLL=CG3D_OUTERLOOPITERS |
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#endif /* TARGET_NEC_SX */ |
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DO j=1,sNy |
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DO i=1,sNx |
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eta_qrNtile(bi,bj) = eta_qrNtile(bi,bj) |
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& +cg3d_q(i,j,k,bi,bj)*cg3d_r(i,j,k,bi,bj) |
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ENDDO |
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ENDDO |
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ENDDO |
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DO k=Nr-1,1,-1 |
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#ifdef TARGET_NEC_SX |
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!CDIR OUTERUNROLL=CG3D_OUTERLOOPITERS |
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#endif /* TARGET_NEC_SX */ |
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DO j=1-1,sNy+1 |
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DO i=1-1,sNx+1 |
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cg3d_q(i,j,k,bi,bj) = cg3d_q(i,j,k,bi,bj) |
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& -zMU(i,j,k,bi,bj)*cg3d_q(i,j,k+1,bi,bj) |
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ENDDO |
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ENDDO |
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#ifdef TARGET_NEC_SX |
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!CDIR OUTERUNROLL=CG3D_OUTERLOOPITERS |
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#endif /* TARGET_NEC_SX */ |
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DO j=1,sNy |
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DO i=1,sNx |
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eta_qrNtile(bi,bj) = eta_qrNtile(bi,bj) |
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& +cg3d_q(i,j,k,bi,bj)*cg3d_r(i,j,k,bi,bj) |
| 328 |
ENDDO |
| 329 |
ENDDO |
| 330 |
ENDDO |
| 331 |
ENDDO |
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ENDDO |
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|
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CALL GLOBAL_SUM_TILE_RL( eta_qrNtile,eta_qrN,myThid ) |
| 335 |
CcnhDebugStarts |
| 336 |
C WRITE(*,*) ' CG3D: Iteration ',it3d-1,' eta_qrN = ',eta_qrN |
| 337 |
CcnhDebugEnds |
| 338 |
cgBeta = eta_qrN/eta_qrNM1 |
| 339 |
CcnhDebugStarts |
| 340 |
C WRITE(*,*) ' CG3D: Iteration ',it3d-1,' beta = ',cgBeta |
| 341 |
CcnhDebugEnds |
| 342 |
eta_qrNM1 = eta_qrN |
| 343 |
|
| 344 |
DO bj=myByLo(myThid),myByHi(myThid) |
| 345 |
DO bi=myBxLo(myThid),myBxHi(myThid) |
| 346 |
DO k=1,Nr |
| 347 |
DO j=1-1,sNy+1 |
| 348 |
DO i=1-1,sNx+1 |
| 349 |
cg3d_s(i,j,k,bi,bj) = cg3d_q(i,j,k,bi,bj) |
| 350 |
& + cgBeta*cg3d_s(i,j,k,bi,bj) |
| 351 |
ENDDO |
| 352 |
ENDDO |
| 353 |
ENDDO |
| 354 |
ENDDO |
| 355 |
ENDDO |
| 356 |
|
| 357 |
C== Evaluate laplace operator on conjugate gradient vector |
| 358 |
C== q = A.s |
| 359 |
alpha = 0. _d 0 |
| 360 |
DO bj=myByLo(myThid),myByHi(myThid) |
| 361 |
DO bi=myBxLo(myThid),myBxHi(myThid) |
| 362 |
alphaTile(bi,bj) = 0. _d 0 |
| 363 |
#ifdef NONLIN_FRSURF |
| 364 |
IF ( select_rStar .NE. 0 ) THEN |
| 365 |
DO j=1,sNy |
| 366 |
DO i=1,sNx |
| 367 |
surfTerm(i,j) = 0. |
| 368 |
ENDDO |
| 369 |
ENDDO |
| 370 |
DO k=1,Nr |
| 371 |
DO j=1,sNy |
| 372 |
DO i=1,sNx |
| 373 |
surfTerm(i,j) = surfTerm(i,j) |
| 374 |
& +cg3d_s(i,j,k,bi,bj)*drF(k)*h0FacC(i,j,k,bi,bj) |
| 375 |
ENDDO |
| 376 |
ENDDO |
| 377 |
ENDDO |
| 378 |
DO j=1,sNy |
| 379 |
DO i=1,sNx |
| 380 |
ks = kSurfC(i,j,bi,bj) |
| 381 |
surfTerm(i,j) = surfTerm(i,j)*cg3dNorm |
| 382 |
& *recip_Rcol(i,j,bi,bj)*recip_Rcol(i,j,bi,bj) |
| 383 |
& *rA(i,j,bi,bj)*deepFac2F(ks) |
| 384 |
& *recip_Bo(i,j,bi,bj)/deltaTMom/deltaTfreesurf |
| 385 |
ENDDO |
| 386 |
ENDDO |
| 387 |
ENDIF |
| 388 |
#endif /* NONLIN_FRSURF */ |
| 389 |
IF ( Nr .GT. 1 ) THEN |
| 390 |
k=1 |
| 391 |
#ifdef TARGET_NEC_SX |
| 392 |
!CDIR OUTERUNROLL=CG3D_OUTERLOOPITERS |
| 393 |
#endif /* TARGET_NEC_SX */ |
| 394 |
DO j=1,sNy |
| 395 |
DO i=1,sNx |
| 396 |
cg3d_q(i,j,k,bi,bj) = |
| 397 |
& aW3d( i, j, k, bi,bj)*cg3d_s(i-1,j, k, bi,bj) |
| 398 |
& +aW3d(i+1,j, k, bi,bj)*cg3d_s(i+1,j, k, bi,bj) |
| 399 |
& +aS3d( i, j, k, bi,bj)*cg3d_s( i,j-1,k, bi,bj) |
| 400 |
& +aS3d( i,j+1,k, bi,bj)*cg3d_s( i,j+1,k, bi,bj) |
| 401 |
& +aV3d( i, j,k+1,bi,bj)*cg3d_s( i, j,k+1,bi,bj) |
| 402 |
& +aC3d( i, j, k, bi,bj)*cg3d_s( i, j, k, bi,bj) |
| 403 |
#ifdef NONLIN_FRSURF |
| 404 |
& -surfFac*surfTerm(i,j)*drF(k)*h0FacC(i,j,k,bi,bj) |
| 405 |
#endif /* NONLIN_FRSURF */ |
| 406 |
alphaTile(bi,bj) = alphaTile(bi,bj) |
| 407 |
& +cg3d_s(i,j,k,bi,bj)*cg3d_q(i,j,k,bi,bj) |
| 408 |
ENDDO |
| 409 |
ENDDO |
| 410 |
ELSE |
| 411 |
k=1 |
| 412 |
#ifdef TARGET_NEC_SX |
| 413 |
!CDIR OUTERUNROLL=CG3D_OUTERLOOPITERS |
| 414 |
#endif /* TARGET_NEC_SX */ |
| 415 |
DO j=1,sNy |
| 416 |
DO i=1,sNx |
| 417 |
cg3d_q(i,j,k,bi,bj) = |
| 418 |
& aW3d( i, j, k, bi,bj)*cg3d_s(i-1,j, k, bi,bj) |
| 419 |
& +aW3d(i+1,j, k, bi,bj)*cg3d_s(i+1,j, k, bi,bj) |
| 420 |
& +aS3d( i, j, k, bi,bj)*cg3d_s( i,j-1,k, bi,bj) |
| 421 |
& +aS3d( i,j+1,k, bi,bj)*cg3d_s( i,j+1,k, bi,bj) |
| 422 |
& +aC3d( i, j, k, bi,bj)*cg3d_s( i, j, k, bi,bj) |
| 423 |
#ifdef NONLIN_FRSURF |
| 424 |
& -surfFac*surfTerm(i,j)*drF(k)*h0FacC(i,j,k,bi,bj) |
| 425 |
#endif /* NONLIN_FRSURF */ |
| 426 |
alphaTile(bi,bj) = alphaTile(bi,bj) |
| 427 |
& +cg3d_s(i,j,k,bi,bj)*cg3d_q(i,j,k,bi,bj) |
| 428 |
ENDDO |
| 429 |
ENDDO |
| 430 |
ENDIF |
| 431 |
DO k=2,Nr-1 |
| 432 |
#ifdef TARGET_NEC_SX |
| 433 |
!CDIR OUTERUNROLL=CG3D_OUTERLOOPITERS |
| 434 |
#endif /* TARGET_NEC_SX */ |
| 435 |
DO j=1,sNy |
| 436 |
DO i=1,sNx |
| 437 |
cg3d_q(i,j,k,bi,bj) = |
| 438 |
& aW3d( i, j, k, bi,bj)*cg3d_s(i-1,j, k, bi,bj) |
| 439 |
& +aW3d(i+1,j, k, bi,bj)*cg3d_s(i+1,j, k, bi,bj) |
| 440 |
& +aS3d( i, j, k, bi,bj)*cg3d_s( i,j-1,k, bi,bj) |
| 441 |
& +aS3d( i,j+1,k, bi,bj)*cg3d_s( i,j+1,k, bi,bj) |
| 442 |
& +aV3d( i, j, k, bi,bj)*cg3d_s( i, j,k-1,bi,bj) |
| 443 |
& +aV3d( i, j,k+1,bi,bj)*cg3d_s( i, j,k+1,bi,bj) |
| 444 |
& +aC3d( i, j, k, bi,bj)*cg3d_s( i, j, k, bi,bj) |
| 445 |
#ifdef NONLIN_FRSURF |
| 446 |
& -surfFac*surfTerm(i,j)*drF(k)*h0FacC(i,j,k,bi,bj) |
| 447 |
#endif /* NONLIN_FRSURF */ |
| 448 |
alphaTile(bi,bj) = alphaTile(bi,bj) |
| 449 |
& +cg3d_s(i,j,k,bi,bj)*cg3d_q(i,j,k,bi,bj) |
| 450 |
ENDDO |
| 451 |
ENDDO |
| 452 |
ENDDO |
| 453 |
IF ( Nr .GT. 1 ) THEN |
| 454 |
k=Nr |
| 455 |
#ifdef TARGET_NEC_SX |
| 456 |
!CDIR OUTERUNROLL=CG3D_OUTERLOOPITERS |
| 457 |
#endif /* TARGET_NEC_SX */ |
| 458 |
DO j=1,sNy |
| 459 |
DO i=1,sNx |
| 460 |
cg3d_q(i,j,k,bi,bj) = |
| 461 |
& aW3d( i, j, k, bi,bj)*cg3d_s(i-1,j, k, bi,bj) |
| 462 |
& +aW3d(i+1,j, k, bi,bj)*cg3d_s(i+1,j, k, bi,bj) |
| 463 |
& +aS3d( i, j, k, bi,bj)*cg3d_s( i,j-1,k, bi,bj) |
| 464 |
& +aS3d( i,j+1,k, bi,bj)*cg3d_s( i,j+1,k, bi,bj) |
| 465 |
& +aV3d( i, j, k, bi,bj)*cg3d_s( i, j,k-1,bi,bj) |
| 466 |
& +aC3d( i, j, k, bi,bj)*cg3d_s( i, j, k, bi,bj) |
| 467 |
#ifdef NONLIN_FRSURF |
| 468 |
& -surfFac*surfTerm(i,j)*drF(k)*h0FacC(i,j,k,bi,bj) |
| 469 |
#endif /* NONLIN_FRSURF */ |
| 470 |
alphaTile(bi,bj) = alphaTile(bi,bj) |
| 471 |
& +cg3d_s(i,j,k,bi,bj)*cg3d_q(i,j,k,bi,bj) |
| 472 |
ENDDO |
| 473 |
ENDDO |
| 474 |
ENDIF |
| 475 |
ENDDO |
| 476 |
ENDDO |
| 477 |
CALL GLOBAL_SUM_TILE_RL( alphaTile, alpha, myThid ) |
| 478 |
CcnhDebugStarts |
| 479 |
C WRITE(*,*) ' CG3D: Iteration ',it3d-1,' SUM(s*q)= ',alpha |
| 480 |
CcnhDebugEnds |
| 481 |
alpha = eta_qrN/alpha |
| 482 |
CcnhDebugStarts |
| 483 |
C WRITE(*,*) ' CG3D: Iteration ',it3d-1,' alpha= ',alpha |
| 484 |
CcnhDebugEnds |
| 485 |
|
| 486 |
C== Update solution and residual vectors |
| 487 |
C Now compute "interior" points. |
| 488 |
err = 0. _d 0 |
| 489 |
DO bj=myByLo(myThid),myByHi(myThid) |
| 490 |
DO bi=myBxLo(myThid),myBxHi(myThid) |
| 491 |
errTile(bi,bj) = 0. _d 0 |
| 492 |
DO k=1,Nr |
| 493 |
#ifdef TARGET_NEC_SX |
| 494 |
!CDIR OUTERUNROLL=CG3D_OUTERLOOPITERS |
| 495 |
#endif /* TARGET_NEC_SX */ |
| 496 |
DO j=1,sNy |
| 497 |
DO i=1,sNx |
| 498 |
cg3d_x(i,j,k,bi,bj)=cg3d_x(i,j,k,bi,bj) |
| 499 |
& +alpha*cg3d_s(i,j,k,bi,bj) |
| 500 |
cg3d_r(i,j,k,bi,bj)=cg3d_r(i,j,k,bi,bj) |
| 501 |
& -alpha*cg3d_q(i,j,k,bi,bj) |
| 502 |
errTile(bi,bj) = errTile(bi,bj) |
| 503 |
& +cg3d_r(i,j,k,bi,bj)*cg3d_r(i,j,k,bi,bj) |
| 504 |
ENDDO |
| 505 |
ENDDO |
| 506 |
ENDDO |
| 507 |
ENDDO |
| 508 |
ENDDO |
| 509 |
|
| 510 |
CALL GLOBAL_SUM_TILE_RL( errTile, err, myThid ) |
| 511 |
err = SQRT(err) |
| 512 |
actualIts = it3d |
| 513 |
actualResidual = err |
| 514 |
IF ( printResidual ) THEN |
| 515 |
IF ( MOD( it3d-1, printResidualFreq ).EQ.0 ) THEN |
| 516 |
WRITE(msgBuf,'(A,I6,A,1PE21.14)') |
| 517 |
& ' cg3d: iter=', actualIts, ' ; resid.= ', actualResidual |
| 518 |
CALL PRINT_MESSAGE( msgBuf, standardMessageUnit, |
| 519 |
& SQUEEZE_RIGHT, myThid ) |
| 520 |
ENDIF |
| 521 |
ENDIF |
| 522 |
IF ( actualResidual .LT. cg3dTargetResidual ) GOTO 11 |
| 523 |
CALL EXCH_S3D_RL( cg3d_r, Nr, myThid ) |
| 524 |
|
| 525 |
10 CONTINUE |
| 526 |
11 CONTINUE |
| 527 |
|
| 528 |
IF ( debugLevel.GE.debLevC .AND. diagFreq.GT.0. ) THEN |
| 529 |
CALL WRITE_FLD_S3D_RL( |
| 530 |
I 'cg3d_r_F', 'I10', 1, Nr, cg3d_r, myIter, myThid ) |
| 531 |
ENDIF |
| 532 |
|
| 533 |
C-- Un-normalise the answer |
| 534 |
DO bj=myByLo(myThid),myByHi(myThid) |
| 535 |
DO bi=myBxLo(myThid),myBxHi(myThid) |
| 536 |
DO k=1,Nr |
| 537 |
DO j=1,sNy |
| 538 |
DO i=1,sNx |
| 539 |
cg3d_x(i,j,k,bi,bj) = cg3d_x(i,j,k,bi,bj)/rhsNorm |
| 540 |
ENDDO |
| 541 |
ENDDO |
| 542 |
ENDDO |
| 543 |
ENDDO |
| 544 |
ENDDO |
| 545 |
|
| 546 |
lastResidual = actualResidual |
| 547 |
numIters = actualIts |
| 548 |
|
| 549 |
#endif /* ALLOW_NONHYDROSTATIC */ |
| 550 |
|
| 551 |
RETURN |
| 552 |
END |
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