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C $Header: /u/gcmpack/MITgcm/eesupp/src/eeboot.F,v 1.10 2001/09/21 03:54:34 cnh 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 |
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|
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C !INTERFACE: |
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SUBROUTINE EEBOOT |
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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 |
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C | o Set up execution "environment", particularly perform |
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C | steps to initialise parallel processing. |
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C *==========================================================* |
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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 initialised |
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C | This is OK and works fine. |
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C *==========================================================* |
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|
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C !CALLING SEQUENCE: |
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C eeboot() |
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C | |
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C |-- eeboot_minimal() :: Minimal startup. Just enough to |
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C | allow basic I/O. |
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C | |
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C |-- eeintro_msg() :: Write startup greeting. |
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C | |
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C |-- eeset_parms() :: Set WRAPPER parameters |
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C | |
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C |-- eewrite_eeenv() :: Print WRAPPER parameter settings |
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C | |
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C |-- ini_procs() :: Associate processes with grid regions. |
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C | |
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C |-- ini_threading_environment() :: Associate threads with grid regions. |
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C | |
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C |-- dfile_init() :: Initialise simple multi-process I/O pacakge. |
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|
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C !USES: |
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C == Global variables == |
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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 I :: Loop counter |
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INTEGER I |
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CEOP |
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|
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C-- Set error reporting flags and I/O streams |
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C fatalError is a flag used to indicate that the program |
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C ended abnormally. |
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C errorMessageUnit is the Fortran unit number used for |
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C writing error messages. |
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C standardMessageUnit is the Fortran unit number used for |
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C writing textual, informational output. |
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C eeBootError is a flag used to indicate an error in the |
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C "execution environment" startup pahse as opposed |
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C to the simulation pahse of the execution. |
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C eeEndError is used to indicate an "execution environment" shutdown |
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C error. |
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C thError flag used to allow a thread to report an error. |
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C This is only really used during the startup process, |
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C although it could be used elsewhere. |
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C allMyEdgesAreSharedMemory flag which says for a particular |
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C set of blocks the only form of communication |
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C it does is using shared memory. |
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C threadIsRunning used during startup to enable check that all |
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C the threads are running. |
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fatalError = .FALSE. |
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eeBootError = .FALSE. |
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eeEndError = .FALSE. |
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DO I=1, MAX_NO_THREADS |
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thError(I) = .FALSE. |
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allMyEdgesAreSharedMemory(I) = .TRUE. |
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threadIsRunning(I) = .FALSE. |
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threadIsComplete(I) = .FALSE. |
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ioErrorCount(I) = 0 |
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ENDDO |
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standardMessageUnit = 6 |
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scrUnit1 = 11 |
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scrUnit2 = 12 |
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eeDataUnit = 13 |
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modelDataUnit = 14 |
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errorMessageUnit = 15 |
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cph errorMessageUnit = 0 is not allowed on some platforms, e.g. SP3 |
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C |
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C Annoyingly there is no universal way to have the usingMPI |
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C parameter work as one might expect. This is because, on some |
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C systems I/O does not work until MPI_Init has been called. The |
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C solution for now is that the parameter below may need to be changed |
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C manually! |
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#ifdef ALLOW_USE_MPI |
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usingMPI = .TRUE. |
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#endif |
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|
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C-- Start minimal environment so that we can do I/O |
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C-- to report errors. |
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C Notes |
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C ===== |
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C o Here we start MPI and setup the I/O environment |
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C thatis needed for error reporting. |
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C o Under MPI I/O support is very variable until |
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C MPI is started. This makes is hard to trap the case |
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C where mpirun is used to start a non-MPI run or |
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C we try to start MPI when mpirun was not used. |
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C after it is started. |
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CALL EEBOOT_MINIMAL |
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IF ( eeBootError ) GOTO 999 |
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|
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C-- Now we can write a startup message |
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CALL EEINTRO_MSG |
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|
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C-- Initialise parameters associated with execution environment. |
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CALL EESET_PARMS |
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IF ( eeBootError ) GOTO 999 |
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|
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C-- Write summary of execution environment configuration for this run |
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CALL EEWRITE_EEENV |
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|
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C-- Now do the rest of the multi-process startup. |
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C o Here we map processes to the model grid. |
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C o Print tables of process-grid mappings. |
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C o Do other miscellaneous multi-processing set up steps. For |
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C example under MPI we create datatypes for communication |
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C of array edges. |
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CALL INI_PROCS |
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#ifdef LETS_MAKE_JAM |
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CALL INI_JAM |
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#endif |
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IF ( eeBootError ) GOTO 999 |
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|
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C-- Initialise variables to support "nThreads" of computation. |
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C o Note the program is still running with a single thread of |
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C execution at this stage. |
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CALL INI_THREADING_ENVIRONMENT |
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IF ( eeBootError ) GOTO 999 |
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|
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#ifdef USE_DFILE |
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C-- Initiialise the multi-process IO package |
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CALL DFILE_INIT |
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#endif |
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|
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999 CONTINUE |
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RETURN |
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END |
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