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C $Header: /u/gcmpack/MITgcm/eesupp/src/ini_threading_environment.F,v 1.14 2012/09/03 19:30:33 jmc Exp $
C $Name: $
#include "CPP_EEOPTIONS.h"
#include "PACKAGES_CONFIG.h"
CBOP
C !ROUTINE: INI_THREADING_ENVIRONMENT
C !INTERFACE:
SUBROUTINE INI_THREADING_ENVIRONMENT
C !DESCRIPTION:
C *==========================================================*
C | SUBROUTINE INI\_THREADING\_ENVIRONMENT
C | o Initialise multi-threaded environment.
C *==========================================================*
C | Generally we do not start separate threads here.
C | The separate threads a spawned at later on.
C | Here we perform initialisation of data-structures
C | that indicate which of the nSx x nSy tiles a thread is
C | responsible for.
C | The multiple threads are spawned in the top level MAIN
C | routine.
C *==========================================================*
C !USES:
IMPLICIT NONE
C == Global data ==
#include "SIZE.h"
#include "EEPARAMS.h"
#include "EESUPPORT.h"
C !LOCAL VARIABLES:
C == Local variables ==
C bXPerThread - Blocks of size sNx per thread.
C byPerThread - Blocks of size sNy per thread.
C thId - Thread index. Temporary used in loops
C which set per. thread values on a
C cartesian grid.
C bxLo, bxHi - Work vars. for thread index
C byLo, byHi range. bxLo is the lowest i index
C that a thread covers, bxHi is the
C highest i index. byLo is the lowest
C j index, byHi is the highest j index.
C I, J - Loop counter
C msgBuf - I/O buffer for reporting status information.
C myThid - Dummy thread id for use in printed messages
C ( this routine "INI_THREADING_ENVIRONMENT" is
C called before multi-threading has started.)
INTEGER bxPerThread
INTEGER byPerThread
INTEGER thId
INTEGER bxLo, bxHi
INTEGER byLo, byHi
INTEGER I, J
CHARACTER*(MAX_LEN_MBUF) msgBuf
INTEGER myThid
#ifndef ALLOW_EXCH2
LOGICAL flag
#endif
CEOP
C-- Set default for all threads of having no blocks to
C-- work on - except for thread 1.
myBxLo(1) = 1
myBxHi(1) = nSx
myByLo(1) = 1
myByHi(1) = nSy
DO I = 2, MAX_NO_THREADS
myBxLo(I) = 0
myBxHi(I) = 0
myByLo(I) = 0
myByHi(I) = 0
ENDDO
myThid = 1
commName(COMM_NONE) = 'none'
commName(COMM_MSG ) = 'messages'
commName(COMM_PUT ) = 'put'
commName(COMM_GET ) = 'get'
C-- If there are multiple threads allocate different range of the
C-- nSx*nSy blocks to each thread.
C For now handle simple case of no. blocks nSx = n*nTx and
C no. blocks nSy = m*nTy ( where m and n are integer ). This
C is handled by simply mapping threads to blocks in sequence
C with the x thread index moving fastest.
C Later code which sets the thread number of neighboring blocks
C needs to be consistent with the code here.
nThreads = nTx * nTy
IF ( nThreads .GT. MAX_NO_THREADS ) THEN
WRITE(msgBuf,'(2A,2I6)')
& 'S/R INI_THREADING_ENVIRONMENT:',
& ' Total number of threads exceeds MAX_NO_THREADS',
& nTx*nTy, MAX_NO_THREADS
CALL PRINT_ERROR(msgBuf, myThid)
WRITE(msgBuf,'(2A)')
& ' Needs to increase MAX_NO_THREADS',
& ' in file "EEPARAMS.h" and to re-compile'
CALL PRINT_ERROR(msgBuf, myThid)
eeBootError = .TRUE.
STOP 'ABNORMAL END: S/R INI_THREADING_ENVIRONMENT'
ENDIF
C-- Initialise the barrier mechanisms
C BAR2 will eventually replace barrier everywhere.
CALL BARRIER_INIT
DO I=1, MAX_NO_THREADS
CALL BAR2_INIT(I)
ENDDO
C-- Initialise exchange mechanism
CALL EXCH_INIT
IF ( nThreads .NE. nTx*nTy ) THEN
WRITE(msgBuf,'(A,A,A,I5,A,I5)')
& 'S/R INI_THREADING_ENVIRONMENT:',
& ' Total number of threads is not the same as nTx*nTy.',
& ' nTx * nTy = ',nTx*nTy,' nThreads = ',nThreads
CALL PRINT_ERROR(msgBuf, myThid)
eeBootError = .TRUE.
STOP 'ABNORMAL END: S/R INI_THREADING_ENVIRONMENT'
ENDIF
bxPerThread = nSx/nTx
IF ( bxPerThread*nTx .NE. nSx ) THEN
WRITE(msgBuf,'(A,A,A)')
& 'S/R INI_THREADING_ENVIRONMENT:',
& ' Number of blocks in X (nSx)',
& ' must be exact multiple of threads in X (nTx).'
CALL PRINT_ERROR(msgBuf, myThid)
eeBootError = .TRUE.
STOP 'ABNORMAL END: S/R INI_THREADING_ENVIRONMENT'
ENDIF
byPerThread = nSy/nTy
IF ( byPerThread*nTy .NE. nSy ) THEN
WRITE(msgBuf,'(A,A,A)')
& 'S/R INI_THREADING_ENVIRONMENT:',
& ' Number of blocks in Y (nSy)',
& ' must be exact multiple of threads in Y (nTy).'
CALL PRINT_ERROR(msgBuf, myThid)
eeBootError = .TRUE.
STOP 'ABNORMAL END: S/R INI_THREADING_ENVIRONMENT'
ENDIF
IF ( .NOT. eeBootError ) THEN
byLo = 1
DO J=1,nTy
byHi = byLo+byPerThread-1
bxLo = 1
DO I=1,nTx
thId = (J-1)*nTx+I
bxHi = bxLo+bxPerThread-1
myBxLo(thId) = bxLo
myBxHi(thId) = bxHi
myByLo(thId) = byLo
myByHi(thId) = byHi
bxLo = bxHi+1
ENDDO
byLo = byHi+1
ENDDO
ENDIF
DO thId=1,nThreads
CALL INI_COMMUNICATION_PATTERNS( thId )
ENDDO
C-- Print mapping of threads to grid points.
WRITE(msgBuf,'(A)')
&'// ======================================================'
CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,
& SQUEEZE_RIGHT , 1)
WRITE(msgBuf,'(A)') '// Mapping of tiles to threads'
CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,
& SQUEEZE_RIGHT , 1)
C o Write list of tiles each thread is responsible for
WRITE(msgBuf,'(A)')
&'// ======================================================'
CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,
& SQUEEZE_RIGHT , 1)
DO I=1,nThreads
WRITE(msgBuf,'(A,I4,A,4(I4,A1))')
& '// -o- Thread',I,', tiles (',
& myBxLo(I),':',myBxHi(I),',',myByLo(I),':',myByHi(I),')'
CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,SQUEEZE_BOTH , 1)
ENDDO
WRITE(msgBuf,'(A)') ' '
CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,SQUEEZE_RIGHT , 1)
#ifndef ALLOW_EXCH2
C o For each tile print its communication method(s)
WRITE(msgBuf,'(A)')
&'// ======================================================'
CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,
& SQUEEZE_RIGHT , 1)
WRITE(msgBuf,'(A)') '// Tile <-> Tile connectvity table'
CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,
& SQUEEZE_RIGHT , 1)
WRITE(msgBuf,'(A)')
&'// ======================================================'
CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,
& SQUEEZE_RIGHT , 1)
DO J=1,nSy
DO I=1,nSx
WRITE(msgBuf,'(A,A,I6.6,A,I6.6,A)')
& '//',' Tile number: ',tileNo(I,J),
& ' (process no. = ',myPid,')'
CALL PRINT_MESSAGE(msgBuf,standardMessageUnit,SQUEEZE_RIGHT , 1)
C o West communication details
IF ( tileNoW(I,J).NE. NULL_TILE ) THEN
WRITE(msgBuf,'(A,A,I6.6,A,I6.6,A,A)')
& '// WEST: ',
& 'Tile = ',tileNoW(I,J),
& ', Process = ',tilePidW(I,J),
& ', Comm = ',commName(tileCommModeW(I,J))
CALL PRINT_MESSAGE(msgBuf,standardMessageUnit,SQUEEZE_RIGHT, 1)
WRITE(msgBuf,'(A,A,I6.6,A,I6.6)')
& '// ',
& ' bi = ',tileBiW(I,J),
& ', bj = ',tileBjW(I,J)
CALL PRINT_MESSAGE(msgBuf,standardMessageUnit,SQUEEZE_RIGHT, 1)
ELSE
WRITE(msgBuf,'(A)')
& '// WEST: no neighbor'
CALL PRINT_MESSAGE(msgBuf,standardMessageUnit,SQUEEZE_RIGHT, 1)
ENDIF
C o East communication details
IF ( tileNoE(I,J).NE. NULL_TILE ) THEN
WRITE(msgBuf,'(A,A,I6.6,A,I6.6,A,A)')
& '// EAST: ',
& 'Tile = ',tileNoE(I,J),
& ', Process = ',tilePidE(I,J),
& ', Comm = ',commName(tileCommModeE(I,J))
CALL PRINT_MESSAGE(msgBuf,standardMessageUnit,SQUEEZE_RIGHT, 1)
WRITE(msgBuf,'(A,A,I6.6,A,I6.6)')
& '// ',
& ' bi = ',tileBiE(I,J),
& ', bj = ',tileBjE(I,J)
CALL PRINT_MESSAGE(msgBuf,standardMessageUnit,SQUEEZE_RIGHT, 1)
ELSE
WRITE(msgBuf,'(A)')
& '// EAST: no neighbor'
CALL PRINT_MESSAGE(msgBuf,standardMessageUnit,SQUEEZE_RIGHT, 1)
ENDIF
C o South communication method
IF ( tileNoS(I,J).NE. NULL_TILE ) THEN
WRITE(msgBuf,'(A,A,I6.6,A,I6.6,A,A)')
& '// SOUTH: ',
& 'Tile = ',tileNoS(I,J),
& ', Process = ',tilePidS(I,J),
& ', Comm = ',commName(tileCommModeS(I,J))
CALL PRINT_MESSAGE(msgBuf,standardMessageUnit,SQUEEZE_RIGHT, 1)
WRITE(msgBuf,'(A,A,I6.6,A,I6.6)')
& '// ',
& ' bi = ',tileBiS(I,J),
& ', bj = ',tileBjS(I,J)
CALL PRINT_MESSAGE(msgBuf,standardMessageUnit,SQUEEZE_RIGHT, 1)
ELSE
WRITE(msgBuf,'(A)')
& '// SOUTH: no neighbor'
CALL PRINT_MESSAGE(msgBuf,standardMessageUnit,SQUEEZE_RIGHT, 1)
ENDIF
C o North communication method
IF ( tileNoN(I,J).NE. NULL_TILE ) THEN
WRITE(msgBuf,'(A,A,I6.6,A,I6.6,A,A)')
& '// NORTH: ',
& 'Tile = ',tileNoN(I,J),
& ', Process = ',tilePidN(I,J),
& ', Comm = ',commName(tileCommModeN(I,J))
CALL PRINT_MESSAGE(msgBuf,standardMessageUnit,SQUEEZE_RIGHT, 1)
WRITE(msgBuf,'(A,A,I6.6,A,I6.6)')
& '// ',
& ' bi = ',tileBiN(I,J),
& ', bj = ',tileBjN(I,J)
CALL PRINT_MESSAGE(msgBuf,standardMessageUnit,SQUEEZE_RIGHT, 1)
ELSE
WRITE(msgBuf,'(A)')
& '// NORTH: no neighbor'
CALL PRINT_MESSAGE(msgBuf,standardMessageUnit,SQUEEZE_RIGHT, 1)
ENDIF
ENDDO
ENDDO
WRITE(msgBuf,'(A)') ' '
CALL PRINT_MESSAGE( msgBuf,standardMessageUnit,SQUEEZE_RIGHT, 1)
#endif /* ndef ALLOW_EXCH2 */
C-- Check EXCH-1 options
#ifndef ALLOW_EXCH2
IF ( usingMPI .AND. useCubedSphereExchange ) THEN
C- not working with multi-procs (checked within EXCH1-CUBE S/R) and
C- if compiled with MPI (without EXCH2) safer to set usingMPI to False.
WRITE(msgBuf,'(2A)') 'EXCH-1 useCubedSphereExchange',
& ' unsafe with usingMPI=True'
CALL PRINT_ERROR( msgBuf, myThid )
STOP 'ABNORMAL END: S/R INI_THREADING_ENVIRONMENT'
ENDIF
IF ( nThreads.GT.1 .AND. useCubedSphereExchange ) THEN
C- multi-threads not working for local arrays; could remove the stop if
C we are sure that only shared array (=in common blocks) are exchanged.
WRITE(msgBuf,'(2A)') 'EXCH-1 useCubedSphereExchange',
& ' unsafe with multi-threads'
CALL PRINT_ERROR( msgBuf, myThid )
STOP 'ABNORMAL END: S/R INI_THREADING_ENVIRONMENT'
ENDIF
IF ( nThreads.GT.1 ) THEN
flag = .FALSE.
DO J=1,nSy
DO I=1,nSx
flag = flag
& .OR. tileCommModeW(I,J).EQ.COMM_GET
& .OR. tileCommModeE(I,J).EQ.COMM_GET
& .OR. tileCommModeS(I,J).EQ.COMM_GET
& .OR. tileCommModeN(I,J).EQ.COMM_GET
ENDDO
ENDDO
IF ( flag ) THEN
C- multi-threads not working for local arrays; not safe neither for shared arrays
WRITE(msgBuf,'(3A)') 'EXCH-1 using Comm = ',
& commName(COMM_GET), ' unsafe with multi-threads'
CALL PRINT_ERROR( msgBuf, myThid )
STOP 'ABNORMAL END: S/R INI_THREADING_ENVIRONMENT'
ENDIF
ENDIF
#endif /* ndef ALLOW_EXCH2 */
RETURN
END
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