| 1 |
C $Header: /u/gcmpack/models/MITgcmUV/model/src/forward_step.F,v 1.1 2000/04/05 19:04:13 adcroft Exp $ |
| 2 |
|
| 3 |
#include "CPP_OPTIONS.h" |
| 4 |
|
| 5 |
SUBROUTINE FORWARD_STEP( |
| 6 |
I doHalfStep, iLoop, |
| 7 |
U myCurrentTime, myCurrentIter, |
| 8 |
& myThid) |
| 9 |
C /==========================================================\ |
| 10 |
C | SUBROUTINE FORWARD_STEP | |
| 11 |
C | o Does one instance of the model time stepping | |
| 12 |
C | The time stepping loop in THE_MAIN_LOOP() calls | |
| 13 |
C | this routine | |
| 14 |
C |==========================================================| |
| 15 |
C \==========================================================/ |
| 16 |
IMPLICIT NONE |
| 17 |
C |
| 18 |
C Call Tree |
| 19 |
C ========= |
| 20 |
C |
| 21 |
C THE_MAIN_LOOP() |
| 22 |
C | |
| 23 |
C ==> | ** Time stepping loop starts here ** |
| 24 |
C | | |
| 25 |
C /|\ |-FORWARD_STEP |
| 26 |
C | | | |
| 27 |
C | | |--LOAD_EXTERNAL_DATA |
| 28 |
C /|\ | | o Load and/or set time dependent forcing fields |
| 29 |
C | | | |
| 30 |
C /|\ | |--DYNAMICS |
| 31 |
C | | | o Evaluate "forward" terms |
| 32 |
C /|\ | | |
| 33 |
C | | |--DO_THE_MODEL_IO |
| 34 |
C /|\ | | o Write model state |
| 35 |
C | | | |
| 36 |
C /|\ | |--SOLVE_FOR_PRESSURE |
| 37 |
C | | | o Find pressure field to keep flow non-divergent |
| 38 |
C /|\ | | |
| 39 |
C | | |--DO_GTERM_BLOCKING_EXCHANGES |
| 40 |
C /|\ | | o Update overlap regions |
| 41 |
C | | | |
| 42 |
C /|\ | |--WRITE_CHECKPOINT |
| 43 |
C | | | o Write restart file(s) |
| 44 |
C /|\ | |
| 45 |
C | | |
| 46 |
C |<== | ** Time stepping loop finishes here ** |
| 47 |
C |
| 48 |
|
| 49 |
C == Global variables === |
| 50 |
#include "SIZE.h" |
| 51 |
#include "EEPARAMS.h" |
| 52 |
#include "PARAMS.h" |
| 53 |
#include "DYNVARS.h" |
| 54 |
#include "CG2D.h" |
| 55 |
#ifdef ALLOW_NONHYDROSTATIC |
| 56 |
#include "CG3D.h" |
| 57 |
#endif |
| 58 |
|
| 59 |
C == Routine arguments == |
| 60 |
C doHalfStep - If .TRUE. then this is the last half step |
| 61 |
C iLoop - Invocation count (counter in THE_MAIN_LOOP) |
| 62 |
C myCurrentIter - Iteration counter for this thread |
| 63 |
C myCurrentTime - Time counter for this thread |
| 64 |
C myThid - Thread number for this instance of the routine. |
| 65 |
LOGICAL doHalfStep |
| 66 |
INTEGER iLoop |
| 67 |
INTEGER myCurrentIter |
| 68 |
_RL myCurrentTime |
| 69 |
INTEGER myThid |
| 70 |
|
| 71 |
C == Local variables == |
| 72 |
|
| 73 |
|
| 74 |
C-- Load forcing/external data fields |
| 75 |
CALL TIMER_START('I/O (READ) [FORWARD_STEP]',myThid) |
| 76 |
CALL LOAD_EXTERNAL_FIELDS( myCurrentTime, myCurrentIter, myThid ) |
| 77 |
CALL TIMER_STOP ('I/O (READ) [FORWARD_STEP]',myThid) |
| 78 |
|
| 79 |
#ifdef INCLUDE_SHAPIRO_FILTER_CODE |
| 80 |
C-- Step forward all tiles, filter and exchange. |
| 81 |
CALL TIMER_START('SHAP_FILT [FORWARD_STEP]',myThid) |
| 82 |
CALL SHAP_FILT( myCurrentTime, myCurrentIter, myThid ) |
| 83 |
CALL TIMER_STOP ('SHAP_FILT [FORWARD_STEP]',myThid) |
| 84 |
#endif |
| 85 |
|
| 86 |
C-- Step forward fields and calculate time tendency terms |
| 87 |
CALL TIMER_START('DYNAMICS [FORWARD_STEP]',myThid) |
| 88 |
CALL DYNAMICS( myCurrentTime, myCurrentIter, myThid ) |
| 89 |
CALL TIMER_STOP ('DYNAMICS [FORWARD_STEP]',myThid) |
| 90 |
|
| 91 |
#ifdef ALLOW_NONHYDROSTATIC |
| 92 |
C-- Step forward W field in N-H algorithm |
| 93 |
IF ( nonHydrostatic ) THEN |
| 94 |
CALL TIMER_START('CALC_GW [FORWARD_STEP]',myThid) |
| 95 |
CALL CALC_GW( myThid) |
| 96 |
CALL TIMER_STOP ('CALC_GW [FORWARD_STEP]',myThid) |
| 97 |
ENDIF |
| 98 |
#endif |
| 99 |
|
| 100 |
C-- Do IO if needed. |
| 101 |
C Note: |
| 102 |
C ===== |
| 103 |
C At this point model arrays hold U,V,T,S at "time-level" N |
| 104 |
C and cg2d_x at "time-level" N-1/2 where N = I+timeLevBase-1. |
| 105 |
C By convention this is taken to be the model "state". |
| 106 |
CALL TIMER_START('I/O (WRITE) [FORWARD_STEP]',myThid) |
| 107 |
CALL DO_THE_MODEL_IO( |
| 108 |
& doHalfStep, myCurrentTime, myCurrentIter, myThid ) |
| 109 |
CALL TIMER_STOP ('I/O (WRITE) [FORWARD_STEP]',myThid) |
| 110 |
|
| 111 |
|
| 112 |
IF (.NOT. doHalfStep) THEN |
| 113 |
|
| 114 |
C-- Solve elliptic equation(s). |
| 115 |
C Two-dimensional only for conventional hydrostatic or |
| 116 |
C three-dimensional for non-hydrostatic and/or IGW scheme. |
| 117 |
CALL TIMER_START('SOLVE_FOR_PRESSURE [FORWARD_STEP]',myThid) |
| 118 |
CALL SOLVE_FOR_PRESSURE( myThid ) |
| 119 |
CALL TIMER_STOP ('SOLVE_FOR_PRESSURE [FORWARD_STEP]',myThid) |
| 120 |
|
| 121 |
C-- Do "blocking" sends and receives for tendency "overlap" terms |
| 122 |
CALL TIMER_START('BLOCKING_EXCHANGES [FORWARD_STEP]',myThid) |
| 123 |
CALL DO_GTERM_BLOCKING_EXCHANGES( myThid ) |
| 124 |
CALL TIMER_STOP ('BLOCKING_EXCHANGES [FORWARD_STEP]',myThid) |
| 125 |
|
| 126 |
c myCurrentIter = myCurrentIter + 1 |
| 127 |
c myCurrentTime = myCurrentTime + deltaTClock |
| 128 |
myCurrentIter = nIter0 + iLoop |
| 129 |
myCurrentTime = startTime + deltaTClock * float(iLoop) |
| 130 |
|
| 131 |
C-- Save state for restarts |
| 132 |
C Note: |
| 133 |
C ===== |
| 134 |
C Because of the ordering of the timestepping code and |
| 135 |
C tendency term code at end of loop model arrays hold |
| 136 |
C U,V,T,S at "time-level" N but gu, gv, gs, gt, guNM1,... |
| 137 |
C at "time-level" N+1/2 (guNM1 at "time-level" N+1/2 is |
| 138 |
C gu at "time-level" N-1/2) and cg2d_x at "time-level" N+1/2. |
| 139 |
C where N = I+timeLevBase-1 |
| 140 |
C Thus a checkpoint contains U.0000000000, GU.0000000001 and |
| 141 |
C cg2d_x.0000000001 in the indexing scheme used for the model |
| 142 |
C "state" files. This example is referred to as a checkpoint |
| 143 |
C at time level 1 |
| 144 |
CALL TIMER_START('I/O (WRITE) [FORWARD_STEP]',myThid) |
| 145 |
CALL WRITE_CHECKPOINT( |
| 146 |
& .FALSE., myCurrentTime, myCurrentIter, myThid ) |
| 147 |
CALL TIMER_STOP ('I/O (WRITE) [FORWARD_STEP]',myThid) |
| 148 |
|
| 149 |
ENDIF |
| 150 |
|
| 151 |
RETURN |
| 152 |
END |
Parent Directory
| 
Revision Log
| 
Revision Graph