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C $Header: /u/gcmpack/MITgcm/eesupp/src/eeboot_minimal.F,v 1.17 2006/07/29 22:57:54 jmc Exp $ |
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C $Name: $ |
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#include "CPP_EEOPTIONS.h" |
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CBOP |
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C !ROUTINE: EEBOOT_MINIMAL |
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C !INTERFACE: |
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SUBROUTINE EEBOOT_MINIMAL |
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IMPLICIT NONE |
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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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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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C !LOCAL VARIABLES: |
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C == Local variables == |
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C myThid :: Temp. dummy thread number. |
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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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INTEGER myThid |
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CHARACTER*13 fNam |
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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 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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INTEGER nptmp |
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#ifdef COMPONENT_MODULE |
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INTEGER mpiMyWid |
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#endif |
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#ifdef ALLOW_CPL_MPMICE |
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COMMON /CPL_MPI_ID/ |
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& myworldid, local_ocean_leader, local_ice_leader |
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integer :: n, myid, numprocs, i, ierr, myworldid, numprocsworld |
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integer :: mycomponent |
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integer :: icesize, oceansize |
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integer :: local_ocean_leader, local_ice_leader |
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integer, dimension(:), allocatable :: components |
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integer, dimension(:), allocatable :: icegroup, oceangroup |
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#endif /* ALLOW_CPL_MPMICE */ |
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#endif /* ALLOW_USE_MPI */ |
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CEOP |
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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 EEBOOT_MINIMAL: 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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#ifdef COMPONENT_MODULE |
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C-- Set the running directory |
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CALL MPI_COMM_RANK( MPI_COMM_WORLD, mpiMyWId, mpiRC ) |
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CALL SETDIR( mpiMyWId ) |
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C- jmc: test: |
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C add a 1rst preliminary call EESET_PARAMS to set useCoupler |
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C (needed to decide either to call CPL_INIT or not) |
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CALL EESET_PARMS |
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IF ( eeBootError ) GOTO 999 |
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C- jmc: test end ; otherwise, uncomment next line: |
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c useCoupler = .TRUE. |
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C-- Ask coupler interface for a communicator |
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IF ( useCoupler) CALL CPL_INIT |
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#endif |
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#ifdef ALLOW_CPL_MPMICE |
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CALL SETDIR_OCEAN( ) |
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call MPI_comm_rank(MPI_COMM_WORLD, myworldid, ierr) |
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call MPI_comm_size(MPI_COMM_WORLD, numprocsworld, ierr) |
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C allocate array components based on the number of processors |
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allocate(components(numprocsworld)) |
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C assign a component to the ocean code to organize processors into a group |
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mycomponent=0 |
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C gather components to all processors, |
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C so each knows who is ice and who is ocean |
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call MPI_allgather(mycomponent,1,MPI_INTEGER,components,1, |
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& MPI_INTEGER,MPI_COMM_WORLD,ierr) |
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C form ice and ocean groups |
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C count the processors in each groups |
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icesize=0 |
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oceansize=0 |
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do i=1,numprocsworld |
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if(components(i).eq.0) then |
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oceansize=oceansize+1 |
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elseif(components(i).eq.1) then |
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icesize=icesize+1 |
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else |
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write(6,*) 'error: processor', i, |
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& 'not associated with ice or ocean' |
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stop |
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endif |
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enddo |
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C allocate group arrays |
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allocate(icegroup(icesize)) |
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allocate(oceangroup(oceansize)) |
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C form the groups |
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icesize=0 |
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oceansize=0 |
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do i=1,numprocsworld |
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if(components(i).eq.0) then |
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oceansize=oceansize+1 |
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oceangroup(oceansize)=i-1 ! ranks are from 0 to numprocsworld-1 |
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elseif(components(i).eq.1) then |
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icesize=icesize+1 |
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icegroup(icesize)=i-1 ! ranks are from 0 to numprocsworld-1 |
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else |
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write(6,*) 'error: processor', i, |
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& 'not associated with ice or ocean' |
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endif |
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enddo |
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C pick the lowest rank in the group as the local group leader |
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local_ocean_leader=oceangroup(1) |
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local_ice_leader=icegroup(1) |
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C form ocean communicator |
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call MPI_comm_split(MPI_COMM_WORLD,mycomponent,myworldid, |
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& MPI_COMM_MODEL,ierr) |
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call MPI_comm_rank(MPI_COMM_MODEL,myid,ierr) |
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call MPI_comm_size(MPI_COMM_MODEL,numprocs,ierr) |
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#endif /* ALLOW_CPL_MPMICE */ |
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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 EEBOOT_MINIMAL: 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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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,I6)') |
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& 'S/R EEBOOT_MINIMAL: 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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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,I6)') |
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& 'S/R EEBOOT_MINIMAL: 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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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,2I6)') |
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& 'S/R EEBOOT_MINIMAL: Nb. of processes exceeds MAX_NO_PROCS', |
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& numberOfProcs, MAX_NO_PROCS |
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CALL PRINT_ERROR( msgBuffer , myThid) |
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WRITE(msgBuffer,'(2A)') |
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& ' Needs to increase MAX_NO_PROCS', |
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& ' in file "EEPARAMS.h" and to re-compile' |
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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,2I6)') |
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& 'S/R EEBOOT_MINIMAL: 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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#ifndef ALWAYS_USE_MPI |
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ENDIF |
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#endif |
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#else /* ALLOW_USE_MPI */ |
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WRITE(myProcessStr,'(I4.4)') myProcId |
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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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c WRITE(fNam,'(A,A)') 'STDOUT.', myProcessStr(1:4) |
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c OPEN(standardMessageUnit,FILE=fNam,STATUS='unknown') |
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#endif /* ALLOW_USE_MPI */ |
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#ifdef USE_LIBHPM |
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CALL F_HPMINIT(myProcId, "mitgcmuv") |
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#endif |
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999 CONTINUE |
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RETURN |
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END |
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