| 1 |
C $Header: /u/gcmpack/MITgcm/eesupp/src/ini_threading_environment.F,v 1.12 2009/06/07 14:54:57 jmc Exp $ |
| 2 |
C $Name: $ |
| 3 |
|
| 4 |
#include "CPP_EEOPTIONS.h" |
| 5 |
#include "PACKAGES_CONFIG.h" |
| 6 |
|
| 7 |
CBOP |
| 8 |
|
| 9 |
C !ROUTINE: INI_THREADING_ENVIRONMENT |
| 10 |
|
| 11 |
C !INTERFACE: |
| 12 |
SUBROUTINE INI_THREADING_ENVIRONMENT |
| 13 |
IMPLICIT NONE |
| 14 |
|
| 15 |
C !DESCRIPTION: |
| 16 |
C *==========================================================* |
| 17 |
C | SUBROUTINE INI\_THREADING\_ENVIRONMENT |
| 18 |
C | o Initialise multi-threaded environment. |
| 19 |
C *==========================================================* |
| 20 |
C | Generally we do not start separate threads here. |
| 21 |
C | The separate threads a spawned at later on. |
| 22 |
C | Here we perform initialisation of data-structures |
| 23 |
C | that indicate which of the nSx x nSy tiles a thread is |
| 24 |
C | responsible for. |
| 25 |
C | The multiple threads are spawned in the top level MAIN |
| 26 |
C | routine. |
| 27 |
C *==========================================================* |
| 28 |
|
| 29 |
C !USES: |
| 30 |
C == Global data == |
| 31 |
#include "SIZE.h" |
| 32 |
#include "EEPARAMS.h" |
| 33 |
#include "EESUPPORT.h" |
| 34 |
|
| 35 |
C !LOCAL VARIABLES: |
| 36 |
C == Local variables == |
| 37 |
C bXPerThread - Blocks of size sNx per thread. |
| 38 |
C byPerThread - Blocks of size sNy per thread. |
| 39 |
C thId - Thread index. Temporary used in loops |
| 40 |
C which set per. thread values on a |
| 41 |
C cartesian grid. |
| 42 |
C bxLo, bxHi - Work vars. for thread index |
| 43 |
C byLo, byHi range. bxLo is the lowest i index |
| 44 |
C that a thread covers, bxHi is the |
| 45 |
C highest i index. byLo is the lowest |
| 46 |
C j index, byHi is the highest j index. |
| 47 |
C I, J - Loop counter |
| 48 |
C msgBuf - I/O buffer for reporting status information. |
| 49 |
C myThid - Dummy thread id for use in printed messages |
| 50 |
C ( this routine "INI_THREADING_ENVIRONMENT" is |
| 51 |
C called before multi-threading has started.) |
| 52 |
INTEGER bxPerThread |
| 53 |
INTEGER byPerThread |
| 54 |
INTEGER thId |
| 55 |
INTEGER bxLo, bxHi |
| 56 |
INTEGER byLo, byHi |
| 57 |
INTEGER I, J |
| 58 |
CHARACTER*(MAX_LEN_MBUF) msgBuf |
| 59 |
INTEGER myThid |
| 60 |
#ifndef ALLOW_EXCH2 |
| 61 |
LOGICAL flag |
| 62 |
#endif |
| 63 |
CEOP |
| 64 |
|
| 65 |
C-- Set default for all threads of having no blocks to |
| 66 |
C-- work on - except for thread 1. |
| 67 |
myBxLo(1) = 1 |
| 68 |
myBxHi(1) = nSx |
| 69 |
myByLo(1) = 1 |
| 70 |
myByHi(1) = nSy |
| 71 |
DO I = 2, MAX_NO_THREADS |
| 72 |
myBxLo(I) = 0 |
| 73 |
myBxHi(I) = 0 |
| 74 |
myByLo(I) = 0 |
| 75 |
myByHi(I) = 0 |
| 76 |
ENDDO |
| 77 |
myThid = 1 |
| 78 |
commName(COMM_NONE) = 'none' |
| 79 |
commName(COMM_MSG ) = 'messages' |
| 80 |
commName(COMM_PUT ) = 'put' |
| 81 |
commName(COMM_GET ) = 'get' |
| 82 |
|
| 83 |
C-- If there are multiple threads allocate different range of the |
| 84 |
C-- nSx*nSy blocks to each thread. |
| 85 |
C For now handle simple case of no. blocks nSx = n*nTx and |
| 86 |
C no. blocks nSy = m*nTy ( where m and n are integer ). This |
| 87 |
C is handled by simply mapping threads to blocks in sequence |
| 88 |
C with the x thread index moving fastest. |
| 89 |
C Later code which sets the thread number of neighboring blocks |
| 90 |
C needs to be consistent with the code here. |
| 91 |
nThreads = nTx * nTy |
| 92 |
IF ( nThreads .GT. MAX_NO_THREADS ) THEN |
| 93 |
WRITE(msgBuf,'(2A,2I6)') |
| 94 |
& 'S/R INI_THREADING_ENVIRONMENT:', |
| 95 |
& ' Total number of threads exceeds MAX_NO_THREADS', |
| 96 |
& nTx*nTy, MAX_NO_THREADS |
| 97 |
CALL PRINT_ERROR(msgBuf, myThid) |
| 98 |
WRITE(msgBuf,'(2A)') |
| 99 |
& ' Needs to increase MAX_NO_THREADS', |
| 100 |
& ' in file "EEPARAMS.h" and to re-compile' |
| 101 |
CALL PRINT_ERROR(msgBuf, myThid) |
| 102 |
eeBootError = .TRUE. |
| 103 |
STOP 'ABNORMAL END: S/R INI_THREADING_ENVIRONMENT' |
| 104 |
ENDIF |
| 105 |
|
| 106 |
C-- Initialise the barrier mechanisms |
| 107 |
C BAR2 will eventually replace barrier everywhere. |
| 108 |
CALL BARRIER_INIT |
| 109 |
DO I=1, MAX_NO_THREADS |
| 110 |
CALL BAR2_INIT(I) |
| 111 |
ENDDO |
| 112 |
|
| 113 |
C-- Initialise exchange mechanism |
| 114 |
CALL EXCH_INIT |
| 115 |
|
| 116 |
IF ( nThreads .NE. nTx*nTy ) THEN |
| 117 |
WRITE(msgBuf,'(A,A,A,I5,A,I5)') |
| 118 |
& 'S/R INI_THREADING_ENVIRONMENT:', |
| 119 |
& ' Total number of threads is not the same as nTx*nTy.', |
| 120 |
& ' nTx * nTy = ',nTx*nTy,' nThreads = ',nThreads |
| 121 |
CALL PRINT_ERROR(msgBuf, myThid) |
| 122 |
eeBootError = .TRUE. |
| 123 |
STOP 'ABNORMAL END: S/R INI_THREADING_ENVIRONMENT' |
| 124 |
ENDIF |
| 125 |
bxPerThread = nSx/nTx |
| 126 |
IF ( bxPerThread*nTx .NE. nSx ) THEN |
| 127 |
WRITE(msgBuf,'(A,A,A)') |
| 128 |
& 'S/R INI_THREADING_ENVIRONMENT:', |
| 129 |
& ' Number of blocks in X (nSx)', |
| 130 |
& ' must be exact multiple of threads in X (nTx).' |
| 131 |
CALL PRINT_ERROR(msgBuf, myThid) |
| 132 |
eeBootError = .TRUE. |
| 133 |
STOP 'ABNORMAL END: S/R INI_THREADING_ENVIRONMENT' |
| 134 |
ENDIF |
| 135 |
byPerThread = nSy/nTy |
| 136 |
IF ( byPerThread*nTy .NE. nSy ) THEN |
| 137 |
WRITE(msgBuf,'(A,A,A)') |
| 138 |
& 'S/R INI_THREADING_ENVIRONMENT:', |
| 139 |
& ' Number of blocks in Y (nSy)', |
| 140 |
& ' must be exact multiple of threads in Y (nTy).' |
| 141 |
CALL PRINT_ERROR(msgBuf, myThid) |
| 142 |
eeBootError = .TRUE. |
| 143 |
STOP 'ABNORMAL END: S/R INI_THREADING_ENVIRONMENT' |
| 144 |
ENDIF |
| 145 |
IF ( .NOT. eeBootError ) THEN |
| 146 |
byLo = 1 |
| 147 |
DO J=1,nTy |
| 148 |
byHi = byLo+byPerThread-1 |
| 149 |
bxLo = 1 |
| 150 |
DO I=1,nTx |
| 151 |
thId = (J-1)*nTx+I |
| 152 |
bxHi = bxLo+bxPerThread-1 |
| 153 |
myBxLo(thId) = bxLo |
| 154 |
myBxHi(thId) = bxHi |
| 155 |
myByLo(thId) = byLo |
| 156 |
myByHi(thId) = byHi |
| 157 |
bxLo = bxHi+1 |
| 158 |
ENDDO |
| 159 |
byLo = byHi+1 |
| 160 |
ENDDO |
| 161 |
ENDIF |
| 162 |
|
| 163 |
DO thId=1,nThreads |
| 164 |
CALL INI_COMMUNICATION_PATTERNS( thId ) |
| 165 |
ENDDO |
| 166 |
|
| 167 |
C-- Print mapping of threads to grid points. |
| 168 |
WRITE(msgBuf,'(A)') |
| 169 |
&'// ======================================================' |
| 170 |
CALL PRINT_MESSAGE( msgBuf, standardMessageUnit, |
| 171 |
& SQUEEZE_RIGHT , 1) |
| 172 |
WRITE(msgBuf,'(A)') '// Mapping of tiles to threads' |
| 173 |
CALL PRINT_MESSAGE( msgBuf, standardMessageUnit, |
| 174 |
& SQUEEZE_RIGHT , 1) |
| 175 |
C o Write list of tiles each thread is responsible for |
| 176 |
WRITE(msgBuf,'(A)') |
| 177 |
&'// ======================================================' |
| 178 |
CALL PRINT_MESSAGE( msgBuf, standardMessageUnit, |
| 179 |
& SQUEEZE_RIGHT , 1) |
| 180 |
DO I=1,nThreads |
| 181 |
WRITE(msgBuf,'(A,I4,A,4(I4,A1))') |
| 182 |
& '// -o- Thread',I,', tiles (', |
| 183 |
& myBxLo(I),':',myBxHi(I),',',myByLo(I),':',myByHi(I),')' |
| 184 |
CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,SQUEEZE_BOTH , 1) |
| 185 |
ENDDO |
| 186 |
WRITE(msgBuf,'(A)') ' ' |
| 187 |
CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,SQUEEZE_RIGHT , 1) |
| 188 |
|
| 189 |
#ifndef ALLOW_EXCH2 |
| 190 |
C o For each tile print its communication method(s) |
| 191 |
WRITE(msgBuf,'(A)') |
| 192 |
&'// ======================================================' |
| 193 |
CALL PRINT_MESSAGE( msgBuf, standardMessageUnit, |
| 194 |
& SQUEEZE_RIGHT , 1) |
| 195 |
WRITE(msgBuf,'(A)') '// Tile <-> Tile connectvity table' |
| 196 |
CALL PRINT_MESSAGE( msgBuf, standardMessageUnit, |
| 197 |
& SQUEEZE_RIGHT , 1) |
| 198 |
WRITE(msgBuf,'(A)') |
| 199 |
&'// ======================================================' |
| 200 |
CALL PRINT_MESSAGE( msgBuf, standardMessageUnit, |
| 201 |
& SQUEEZE_RIGHT , 1) |
| 202 |
DO J=1,nSy |
| 203 |
DO I=1,nSx |
| 204 |
WRITE(msgBuf,'(A,A,I6.6,A,I6.6,A)') |
| 205 |
& '//',' Tile number: ',tileNo(I,J), |
| 206 |
& ' (process no. = ',myPid,')' |
| 207 |
CALL PRINT_MESSAGE(msgBuf,standardMessageUnit,SQUEEZE_RIGHT , 1) |
| 208 |
C o West communication details |
| 209 |
IF ( tileNoW(I,J).NE. NULL_TILE ) THEN |
| 210 |
WRITE(msgBuf,'(A,A,I6.6,A,I6.6,A,A)') |
| 211 |
& '// WEST: ', |
| 212 |
& 'Tile = ',tileNoW(I,J), |
| 213 |
& ', Process = ',tilePidW(I,J), |
| 214 |
& ', Comm = ',commName(tileCommModeW(I,J)) |
| 215 |
CALL PRINT_MESSAGE(msgBuf,standardMessageUnit,SQUEEZE_RIGHT, 1) |
| 216 |
WRITE(msgBuf,'(A,A,I6.6,A,I6.6)') |
| 217 |
& '// ', |
| 218 |
& ' bi = ',tileBiW(I,J), |
| 219 |
& ', bj = ',tileBjW(I,J) |
| 220 |
CALL PRINT_MESSAGE(msgBuf,standardMessageUnit,SQUEEZE_RIGHT, 1) |
| 221 |
ELSE |
| 222 |
WRITE(msgBuf,'(A)') |
| 223 |
& '// WEST: no neighbor' |
| 224 |
CALL PRINT_MESSAGE(msgBuf,standardMessageUnit,SQUEEZE_RIGHT, 1) |
| 225 |
ENDIF |
| 226 |
C o East communication details |
| 227 |
IF ( tileNoE(I,J).NE. NULL_TILE ) THEN |
| 228 |
WRITE(msgBuf,'(A,A,I6.6,A,I6.6,A,A)') |
| 229 |
& '// EAST: ', |
| 230 |
& 'Tile = ',tileNoE(I,J), |
| 231 |
& ', Process = ',tilePidE(I,J), |
| 232 |
& ', Comm = ',commName(tileCommModeE(I,J)) |
| 233 |
CALL PRINT_MESSAGE(msgBuf,standardMessageUnit,SQUEEZE_RIGHT, 1) |
| 234 |
WRITE(msgBuf,'(A,A,I6.6,A,I6.6)') |
| 235 |
& '// ', |
| 236 |
& ' bi = ',tileBiE(I,J), |
| 237 |
& ', bj = ',tileBjE(I,J) |
| 238 |
CALL PRINT_MESSAGE(msgBuf,standardMessageUnit,SQUEEZE_RIGHT, 1) |
| 239 |
ELSE |
| 240 |
WRITE(msgBuf,'(A)') |
| 241 |
& '// EAST: no neighbor' |
| 242 |
CALL PRINT_MESSAGE(msgBuf,standardMessageUnit,SQUEEZE_RIGHT, 1) |
| 243 |
ENDIF |
| 244 |
C o South communication method |
| 245 |
IF ( tileNoS(I,J).NE. NULL_TILE ) THEN |
| 246 |
WRITE(msgBuf,'(A,A,I6.6,A,I6.6,A,A)') |
| 247 |
& '// SOUTH: ', |
| 248 |
& 'Tile = ',tileNoS(I,J), |
| 249 |
& ', Process = ',tilePidS(I,J), |
| 250 |
& ', Comm = ',commName(tileCommModeS(I,J)) |
| 251 |
CALL PRINT_MESSAGE(msgBuf,standardMessageUnit,SQUEEZE_RIGHT, 1) |
| 252 |
WRITE(msgBuf,'(A,A,I6.6,A,I6.6)') |
| 253 |
& '// ', |
| 254 |
& ' bi = ',tileBiS(I,J), |
| 255 |
& ', bj = ',tileBjS(I,J) |
| 256 |
CALL PRINT_MESSAGE(msgBuf,standardMessageUnit,SQUEEZE_RIGHT, 1) |
| 257 |
ELSE |
| 258 |
WRITE(msgBuf,'(A)') |
| 259 |
& '// SOUTH: no neighbor' |
| 260 |
CALL PRINT_MESSAGE(msgBuf,standardMessageUnit,SQUEEZE_RIGHT, 1) |
| 261 |
ENDIF |
| 262 |
C o North communication method |
| 263 |
IF ( tileNoN(I,J).NE. NULL_TILE ) THEN |
| 264 |
WRITE(msgBuf,'(A,A,I6.6,A,I6.6,A,A)') |
| 265 |
& '// NORTH: ', |
| 266 |
& 'Tile = ',tileNoN(I,J), |
| 267 |
& ', Process = ',tilePidN(I,J), |
| 268 |
& ', Comm = ',commName(tileCommModeN(I,J)) |
| 269 |
CALL PRINT_MESSAGE(msgBuf,standardMessageUnit,SQUEEZE_RIGHT, 1) |
| 270 |
WRITE(msgBuf,'(A,A,I6.6,A,I6.6)') |
| 271 |
& '// ', |
| 272 |
& ' bi = ',tileBiN(I,J), |
| 273 |
& ', bj = ',tileBjN(I,J) |
| 274 |
CALL PRINT_MESSAGE(msgBuf,standardMessageUnit,SQUEEZE_RIGHT, 1) |
| 275 |
ELSE |
| 276 |
WRITE(msgBuf,'(A)') |
| 277 |
& '// NORTH: no neighbor' |
| 278 |
CALL PRINT_MESSAGE(msgBuf,standardMessageUnit,SQUEEZE_RIGHT, 1) |
| 279 |
ENDIF |
| 280 |
ENDDO |
| 281 |
ENDDO |
| 282 |
WRITE(msgBuf,'(A)') ' ' |
| 283 |
CALL PRINT_MESSAGE( msgBuf,standardMessageUnit,SQUEEZE_RIGHT, 1) |
| 284 |
#endif /* ndef ALLOW_EXCH2 */ |
| 285 |
|
| 286 |
C-- Check threading options |
| 287 |
#ifndef ALLOW_EXCH2 |
| 288 |
IF ( nThreads.GT.1 .AND. useCubedSphereExchange ) THEN |
| 289 |
C- multi-threads not working for local arrays; could remove the stop if |
| 290 |
C we are sure that only shared array (=in common blocks) are exchanged. |
| 291 |
WRITE(msgBuf,'(2A)') 'EXCH-1 useCubedSphereExchange', |
| 292 |
& ' unsafe with multi-threads' |
| 293 |
CALL PRINT_ERROR( msgBuf, myThid ) |
| 294 |
STOP 'ABNORMAL END: S/R INI_THREADING_ENVIRONMENT' |
| 295 |
ENDIF |
| 296 |
IF ( nThreads.GT.1 ) THEN |
| 297 |
flag = .FALSE. |
| 298 |
DO J=1,nSy |
| 299 |
DO I=1,nSx |
| 300 |
flag = flag |
| 301 |
& .OR. tileCommModeW(I,J).EQ.COMM_GET |
| 302 |
& .OR. tileCommModeE(I,J).EQ.COMM_GET |
| 303 |
& .OR. tileCommModeS(I,J).EQ.COMM_GET |
| 304 |
& .OR. tileCommModeN(I,J).EQ.COMM_GET |
| 305 |
ENDDO |
| 306 |
ENDDO |
| 307 |
IF ( flag ) THEN |
| 308 |
C- multi-threads not working for local arrays; not safe neither for shared arrays |
| 309 |
WRITE(msgBuf,'(3A)') 'EXCH-1 using Comm = ', |
| 310 |
& commName(COMM_GET), ' unsafe with multi-threads' |
| 311 |
CALL PRINT_ERROR( msgBuf, myThid ) |
| 312 |
STOP 'ABNORMAL END: S/R INI_THREADING_ENVIRONMENT' |
| 313 |
ENDIF |
| 314 |
ENDIF |
| 315 |
#endif /* ndef ALLOW_EXCH2 */ |
| 316 |
|
| 317 |
RETURN |
| 318 |
END |
Parent Directory
| 
Revision Log
| 
Revision Graph