| 1 |
C $Header: /u/u0/gcmpack/MITgcm/eesupp/src/main.F,v 1.22 2006/01/12 03:24:09 edhill Exp $ |
| 2 |
C $Name: $ |
| 3 |
|
| 4 |
CBOI |
| 5 |
C |
| 6 |
C !TITLE: WRAPPER CODE SYNOPSIS |
| 7 |
C !AUTHORS: mitgcm developers ( support@mitgcm.org ) |
| 8 |
C !AFFILIATION: Massachussetts Institute of Technology |
| 9 |
C !DATE: |
| 10 |
C !INTRODUCTION: |
| 11 |
C Wrapper synopsis and code Routines in the subdirectories under |
| 12 |
C eesupp/ ( src/ and inc/ ) provide the core framework within which |
| 13 |
C numerical and ancilliary software of MITgcm operates. The eesupp/ |
| 14 |
C directories provide a collection of software we call {\bf WRAPPER} |
| 15 |
C ( ({\bf W}rappable {\bf A}pplication {\bf P}aralell {\bf |
| 16 |
C P}rogramming {\bf E}nvironment {\bf R}esource). The {bf WRAPPER} |
| 17 |
C provides a generic bootstrapping capability to start applications |
| 18 |
C in a manner that allows them to exploit single and |
| 19 |
C multi-processing environments on all present day hardware |
| 20 |
C platforms (spanning vector SMP systems to distributed memory and |
| 21 |
C processing cluster systems). Numerical applications must be coded |
| 22 |
C to fit within the {\bf WRAPPER}. This entails applications |
| 23 |
C adopting a particular style for declaring data structures |
| 24 |
C representing grids and values on grids. The {\bf WRAPPER} |
| 25 |
C currently provides support for grid point models using a single |
| 26 |
C global indexing system. This is sufficient for latitude-logitude, |
| 27 |
C cylindrical, and cartesian coordinate configurations. There is |
| 28 |
C also limited support for composing grids in which no single, |
| 29 |
C sructured global index can be defined. At present, this support is |
| 30 |
C limited to specific configurations of projections of a cube onto |
| 31 |
C the sphere. |
| 32 |
C |
| 33 |
C The main functions supported by the current {\bf WRAPPER} code are |
| 34 |
C \begin{itemize} |
| 35 |
C \item program startup and termination including |
| 36 |
C creation/management of multiple threads and/or processes |
| 37 |
C \item communication and synchronisatioin operations between |
| 38 |
C multiple processes and/or threads |
| 39 |
C \item multi-process input and output operations to disk and to |
| 40 |
C other applications |
| 41 |
C \end{itemize} |
| 42 |
C |
| 43 |
C Multi-process execution assumes the existence of MPI for process |
| 44 |
C startup and termination. However, MPI does not have to be used for |
| 45 |
C performance critical operations. Instead, {\bf WRAPPER} |
| 46 |
C performance critical parallel primitives are implemented to allow |
| 47 |
C them to bind to different low-level system software |
| 48 |
C layers. Bindings exist for using {\bf WRAPPER} with portable |
| 49 |
C systems such as MPI and UNIX System V IPC memory mapping, as well |
| 50 |
C bindings for high-performance propreitary systems such as Myrinet |
| 51 |
C GM software and Compaq IMC memory channel technology. |
| 52 |
C |
| 53 |
C |
| 54 |
CEOI |
| 55 |
|
| 56 |
|
| 57 |
C-- Get C preprocessor options |
| 58 |
#include "PACKAGES_CONFIG.h" |
| 59 |
#include "CPP_OPTIONS.h" |
| 60 |
#include "CPP_EEOPTIONS.h" |
| 61 |
|
| 62 |
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
| 63 |
CBOP |
| 64 |
C !ROUTINE: MAIN |
| 65 |
|
| 66 |
C !INTERFACE: |
| 67 |
PROGRAM MAIN |
| 68 |
IMPLICIT NONE |
| 69 |
|
| 70 |
C !DESCRIPTION: |
| 71 |
C *==========================================================* |
| 72 |
C | PROGRAM MAIN |
| 73 |
C | o MAIN wrapper for MITgcm UV implementation. |
| 74 |
C *==========================================================* |
| 75 |
C | MAIN controls the "execution environment". |
| 76 |
C | Its main functions are |
| 77 |
C | 1. call procedure EEBOOT to perform execution environment |
| 78 |
C | initialisation. |
| 79 |
C | 2. call procedure THE\_MODEL\_MAIN once for each concurrent |
| 80 |
C | thread. THE\_MODEL\_MAIN is the user supplied top-level |
| 81 |
C | routine. |
| 82 |
C | 3. call procedure EEDIE to perform execution environment |
| 83 |
C | shutdown. |
| 84 |
C *==========================================================* |
| 85 |
|
| 86 |
C !CALLING SEQUENCE: |
| 87 |
C |
| 88 |
C main() |
| 89 |
C | |
| 90 |
C |--eeboot() :: WRAPPER initilization |
| 91 |
C | |
| 92 |
C |--check_threads() :: Validate multiple thread start up. |
| 93 |
C | |
| 94 |
C |--the_model_main() :: Numerical code top-level driver routine |
| 95 |
C | |
| 96 |
C |--eedie() :: WRAPPER termination |
| 97 |
|
| 98 |
C !USES: |
| 99 |
C == Global variables == |
| 100 |
C Include all the "shared" data here. That means all common |
| 101 |
C blocks used in the model. On many implementations this is not |
| 102 |
C necessary but doing this is the safest method. |
| 103 |
#include "SIZE.h" |
| 104 |
#include "EEPARAMS.h" |
| 105 |
#include "EESUPPORT.h" |
| 106 |
#include "PARAMS.h" |
| 107 |
#include "GRID.h" |
| 108 |
#include "DYNVARS.h" |
| 109 |
#include "FFIELDS.h" |
| 110 |
#include "SURFACE.h" |
| 111 |
#ifdef ALLOW_TIMEAVE |
| 112 |
#include "TIMEAVE_STATV.h" |
| 113 |
#endif |
| 114 |
#ifdef HAVE_SIGREG |
| 115 |
#include "SIGREG.h" |
| 116 |
#endif |
| 117 |
|
| 118 |
C !LOCAL VARIABLES: |
| 119 |
C-- Local variables |
| 120 |
INTEGER myThid |
| 121 |
INTEGER I |
| 122 |
|
| 123 |
#ifdef USE_OMP_THREADING |
| 124 |
INTEGER OMP_GET_THREAD_NUM |
| 125 |
EXTERNAL OMP_GET_THREAD_NUM |
| 126 |
#endif |
| 127 |
|
| 128 |
CEOP |
| 129 |
|
| 130 |
#ifdef USE_GSL_IEEE |
| 131 |
call fgsl_ieee_env_setup () |
| 132 |
#endif |
| 133 |
|
| 134 |
C-- Set up the execution environment |
| 135 |
C EEBOOT loads a execution environment parameter file |
| 136 |
C ( called "eedata" by default ) and sets variables |
| 137 |
C accordingly. |
| 138 |
CALL EEBOOT |
| 139 |
|
| 140 |
C-- Trap errors |
| 141 |
IF ( eeBootError ) THEN |
| 142 |
fatalError = .TRUE. |
| 143 |
GOTO 999 |
| 144 |
ENDIF |
| 145 |
|
| 146 |
#ifdef HAVE_SETRLSTK |
| 147 |
IF (useSETRLSTK) THEN |
| 148 |
CALL setrlstk |
| 149 |
ENDIF |
| 150 |
#endif |
| 151 |
|
| 152 |
#ifdef HAVE_SIGREG |
| 153 |
IF (useSIGREG) THEN |
| 154 |
i_got_signal = 0 |
| 155 |
CALL sigreg( i_got_signal ) |
| 156 |
ENDIF |
| 157 |
#endif |
| 158 |
|
| 159 |
#ifdef HAVE_PTHREADS |
| 160 |
C IF (usePTHREADS) THEN |
| 161 |
CALL PTINIT(nThreads) |
| 162 |
C ELSE |
| 163 |
#else |
| 164 |
|
| 165 |
C-- Start nThreads concurrent threads. |
| 166 |
C Note: We do a fiddly check here. The check is performed |
| 167 |
C by CHECK_THREADS. CHECK_THREADS does a count |
| 168 |
C of all the threads. If after ten seconds it has not |
| 169 |
C found nThreads threads are running it flags an |
| 170 |
C error. This traps the case in which the input |
| 171 |
C parameter nThreads is different from the actual |
| 172 |
C number of concurrent threads the OS gives us. This |
| 173 |
C case causes a deadlock if we do not trap it here. |
| 174 |
#include "MAIN_PDIRECTIVES1.h" |
| 175 |
DO I=1,nThreads |
| 176 |
#ifdef USE_OMP_THREADING |
| 177 |
IF ( OMP_GET_THREAD_NUM() .EQ. I-1 ) THEN |
| 178 |
#endif |
| 179 |
myThid = I |
| 180 |
|
| 181 |
C-- Do check to see if there are nThreads threads running |
| 182 |
IF ( .NOT. eeBootError ) THEN |
| 183 |
CALL CHECK_THREADS( myThid ) |
| 184 |
ENDIF |
| 185 |
|
| 186 |
C-- Invoke nThreads instances of the numerical model |
| 187 |
IF ( .NOT. eeBootError ) THEN |
| 188 |
#ifdef ALLOW_ADMTLM |
| 189 |
CALL ADMTLM_DSVD(myThid) |
| 190 |
#else |
| 191 |
CALL THE_MODEL_MAIN(myThid) |
| 192 |
#endif |
| 193 |
ENDIF |
| 194 |
|
| 195 |
C-- Each threads sets flag indicating it is done |
| 196 |
threadIsComplete(myThid) = .TRUE. |
| 197 |
IF ( .NOT. eeBootError ) THEN |
| 198 |
_BARRIER |
| 199 |
ENDIF |
| 200 |
#ifdef USE_OMP_THREADING |
| 201 |
ENDIF |
| 202 |
#endif |
| 203 |
ENDDO |
| 204 |
#include "MAIN_PDIRECTIVES2.h" |
| 205 |
|
| 206 |
#endif /* HAVE_PTHREADS */ |
| 207 |
|
| 208 |
999 CONTINUE |
| 209 |
C-- Shut down execution environment |
| 210 |
CALL EEDIE |
| 211 |
|
| 212 |
C-- Write closedown status |
| 213 |
IF ( fatalError ) THEN |
| 214 |
STOP 'ABNORMAL END: PROGRAM MAIN' |
| 215 |
ELSE |
| 216 |
STOP 'NORMAL END' |
| 217 |
ENDIF |
| 218 |
C |
| 219 |
END |
| 220 |
|
| 221 |
|
| 222 |
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
| 223 |
|
| 224 |
CBOP 0 |
| 225 |
C !ROUTINE: PTREENTRY |
| 226 |
|
| 227 |
C !INTERFACE: |
| 228 |
SUBROUTINE PTREENTRY( |
| 229 |
I myThid ) |
| 230 |
|
| 231 |
C !DESCRIPTION: |
| 232 |
C Re-entry point for a pthreads-based threading mechanism. The |
| 233 |
C intent is to produce a threading hack that will work with gcc/g77. |
| 234 |
|
| 235 |
C !USES: |
| 236 |
implicit none |
| 237 |
#include "SIZE.h" |
| 238 |
#include "EEPARAMS.h" |
| 239 |
#include "EESUPPORT.h" |
| 240 |
#include "PARAMS.h" |
| 241 |
#include "GRID.h" |
| 242 |
#include "DYNVARS.h" |
| 243 |
#include "FFIELDS.h" |
| 244 |
#include "SURFACE.h" |
| 245 |
#ifdef ALLOW_TIMEAVE |
| 246 |
#include "TIMEAVE_STATV.h" |
| 247 |
#endif |
| 248 |
|
| 249 |
C !INPUT PARAMETERS: |
| 250 |
integer myThid |
| 251 |
CEOP |
| 252 |
|
| 253 |
write(*,*) 'myThid = ', myThid |
| 254 |
CALL CHECK_THREADS( myThid ) |
| 255 |
|
| 256 |
C CALL THE_MODEL_MAIN(myThid) |
| 257 |
|
| 258 |
threadIsComplete(myThid) = .TRUE. |
| 259 |
|
| 260 |
RETURN |
| 261 |
END |
| 262 |
|
| 263 |
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
Parent Directory
| 
Revision Log
| 
Revision Graph