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C $Header: /u/gcmpack/models/MITgcmUV/eesupp/src/eeboot_minimal.F,v 1.2 1998/04/23 20:37:29 cnh Exp $ |
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#include "CPP_EEOPTIONS.h" |
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CStartOfInterface |
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SUBROUTINE EEBOOT_MINIMAL |
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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 should work fine. | |
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C \==========================================================/ |
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|
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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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CEndOfInterface |
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C === Local variables === |
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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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#endif /* ALLOW_USE_MPI */ |
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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 aren't 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,I)') |
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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-- Get my process number |
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CALL MPI_COMM_RANK( MPI_COMM_WORLD, 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,I)') |
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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 didn't start up. |
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CALL MPI_BARRIER( MPI_COMM_WORLD, mpiRC ) |
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IF ( mpiRC .NE. MPI_SUCCESS ) THEN |
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eeBootError = .TRUE. |
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WRITE(msgBuffer,'(A,I)') |
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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_WORLD, 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,I)') |
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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't 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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WRITE(msgBuffer,'(A)') |
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& 'S/R INI_PROCS: No. of processes not equal to nPx*nPy' |
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CALL PRINT_ERROR( msgBuffer , myThid) |
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GOTO 999 |
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ENDIF |
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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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999 CONTINUE |
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RETURN |
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END |
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