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C $Header: /u/gcmpack/MITgcm/eesupp/src/eeboot_minimal.F,v 1.8.6.1 2002/04/04 10:19:15 heimbach Exp $ |
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C $Name: $ |
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|
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#include "CPP_EEOPTIONS.h" |
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|
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CBOP |
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C !ROUTINE: EEBOOT_MINIMAL |
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|
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C !INTERFACE: |
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SUBROUTINE EEBOOT_MINIMAL |
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IMPLICIT NONE |
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|
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C !DESCRIPTION: |
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C *==========================================================* |
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C | SUBROUTINE EEBOOT_MINIMAL |
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C | o Set an initial environment that is predictable i.e. |
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C | behaves in a similar way on all machines and stable. |
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C *==========================================================* |
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C | Under MPI this routine calls MPI_INIT to setup the |
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C | mpi environment ( on some systems the code is running as |
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C | a single process prior to MPI_INIT, on others the mpirun |
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C | script has already created multiple processes). Until |
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C | MPI_Init is called it is unclear what state the |
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C | application is in. Once this routine has been run it is |
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C | "safe" to do things like I/O to report erros and to get |
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C | run parameters. |
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C | Note: This routine can also be compiled with CPP |
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C | directives set so that no multi-processing is initialise. |
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C | This is OK and will work fine. |
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C *==========================================================* |
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|
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C !USES: |
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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 "EESUPPORT.h" |
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|
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C !LOCAL VARIABLES: |
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C == Local variables == |
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C myThid :: Temp. dummy thread number. |
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INTEGER myThid |
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#ifdef ALLOW_USE_MPI |
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C mpiRC :: Error code reporting variable used |
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C with MPI. |
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C fNam :: Used to build name of file for standard |
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C output and error output. |
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C msgBuffer :: Used to build messages for printing. |
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CHARACTER*(MAX_LEN_MBUF) msgBuffer |
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INTEGER mpiRC |
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CHARACTER*13 fNam |
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INTEGER nptmp |
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#endif /* ALLOW_USE_MPI */ |
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CEOP |
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|
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C-- Default values set to single processor case |
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numberOfProcs = 1 |
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myProcId = 0 |
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pidIO = myProcId |
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myProcessStr = '------' |
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C Set a dummy value for myThid because we are not multi-threading |
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C yet. |
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myThid = 1 |
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#ifdef ALLOW_USE_MPI |
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C-- |
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C-- MPI style multiple-process initialisation |
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C-- ========================================= |
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#ifndef ALWAYS_USE_MPI |
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IF ( usingMPI ) THEN |
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#endif |
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C-- Initialise MPI multi-process parallel environment. |
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C On some systems program forks at this point. Others have already |
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C forked within mpirun - now thats an open standard! |
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CALL MPI_INIT( mpiRC ) |
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IF ( mpiRC .NE. MPI_SUCCESS ) THEN |
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eeBootError = .TRUE. |
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WRITE(msgBuffer,'(A,I5)') |
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& 'S/R INI_PROCS: MPI_INIT return code', |
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& mpiRC |
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CALL PRINT_ERROR( msgBuffer , myThid) |
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GOTO 999 |
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ENDIF |
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C-- MPI has now been initialized but now we need to either |
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C ask for a communicator or pretend that we have: |
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C Pretend that we have asked for a communicator |
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MPI_COMM_MODEL = MPI_COMM_WORLD |
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C Ask coupler interface for a communicator |
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c hook call MITCOMPONENT_init( 'MITgcmUV', MPI_COMM_MODEL ) |
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|
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C-- Get my process number |
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CALL MPI_COMM_RANK( MPI_COMM_MODEL, mpiMyId, mpiRC ) |
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IF ( mpiRC .NE. MPI_SUCCESS ) THEN |
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eeBootError = .TRUE. |
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WRITE(msgBuffer,'(A,I5)') |
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& 'S/R INI_PROCS: MPI_COMM_RANK return code', |
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& mpiRC |
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CALL PRINT_ERROR( msgBuffer , myThid) |
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GOTO 999 |
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ENDIF |
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myProcId = mpiMyId |
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WRITE(myProcessStr,'(I4.4)') myProcId |
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mpiPidIo = myProcId |
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pidIO = mpiPidIo |
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IF ( mpiPidIo .EQ. myProcId ) THEN |
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WRITE(fNam,'(A,A)') 'STDERR.', myProcessStr(1:4) |
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OPEN(errorMessageUnit,FILE=fNam,STATUS='unknown') |
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WRITE(fNam,'(A,A)') 'STDOUT.', myProcessStr(1:4) |
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OPEN(standardMessageUnit,FILE=fNam,STATUS='unknown') |
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ENDIF |
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|
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C-- Synchronise all processes |
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C Strictly this is superfluous, but by using it we can guarantee to |
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C find out about processes that did not start up. |
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CALL MPI_BARRIER( MPI_COMM_MODEL, mpiRC ) |
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IF ( mpiRC .NE. MPI_SUCCESS ) THEN |
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eeBootError = .TRUE. |
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WRITE(msgBuffer,'(A,I5)') |
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& 'S/R INI_PROCS: MPI_BARRIER return code', |
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& mpiRC |
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CALL PRINT_ERROR( msgBuffer , myThid) |
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GOTO 999 |
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ENDIF |
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|
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C-- Get number of MPI processes |
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CALL MPI_COMM_SIZE ( MPI_COMM_MODEL, mpiNProcs, mpiRC ) |
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IF ( mpiRC .NE. MPI_SUCCESS ) THEN |
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eeBootError = .TRUE. |
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WRITE(msgBuffer,'(A,I5)') |
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& 'S/R INI_PROCS: MPI_COMM_SIZE return code', |
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& mpiRC |
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CALL PRINT_ERROR( msgBuffer , myThid) |
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GOTO 999 |
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ENDIF |
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numberOfProcs = mpiNProcs |
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|
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C-- Can not have more processes than compile time MAX_NO_PROCS |
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IF ( numberOfProcs .GT. MAX_NO_PROCS ) THEN |
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eeBootError = .TRUE. |
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WRITE(msgBuffer,'(A)') |
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& 'S/R INI_PROCS: No. of processes too large' |
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CALL PRINT_ERROR( msgBuffer , myThid) |
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GOTO 999 |
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ENDIF |
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C-- Under MPI only allow same number of processes as proc. |
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C-- grid size. |
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C Strictly we are allowed more procs. but knowing there |
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C is an exact match makes things easier. |
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IF ( numberOfProcs .NE. nPx*nPy ) THEN |
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eeBootError = .TRUE. |
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nptmp = nPx*nPy |
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WRITE(msgBuffer,'(A,2I5)') |
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& 'S/R INI_PROCS: No. of processes not equal to nPx*nPy', |
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& numberOfProcs, nptmp |
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CALL PRINT_ERROR( msgBuffer , myThid) |
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GOTO 999 |
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ENDIF |
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|
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#ifndef ALWAYS_USE_MPI |
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ENDIF |
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#endif |
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#endif /* ALLOW_USE_MPI */ |
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|
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999 CONTINUE |
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|
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RETURN |
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END |
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