source: palm/trunk/SOURCE/palm.f90 @ 4875

! !> @file palm.f90
!--------------------------------------------------------------------------------------------------!
! This file is part of the PALM model system.
!
! PALM is free software: you can redistribute it and/or modify it under the terms of the GNU General
! Public License as published by the Free Software Foundation, either version 3 of the License, or
! (at your option) any later version.
!
! PALM is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the
! implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
! Public License for more details.
!
! You should have received a copy of the GNU General Public License along with PALM. If not, see
! <http://www.gnu.org/licenses/>.
!
! Copyright 1997-2021 Leibniz Universitaet Hannover
!--------------------------------------------------------------------------------------------------!
!
! Current revisions:
! -----------------
!
!
! Former revisions:
! -----------------
! $Id: palm.f90 4828 2021-01-05 11:21:41Z scharf $
! file re-formatted to follow the PALM coding standard
!
! 4539 2020-05-18 14:05:17Z raasch
! log point name changed
!
! 4535 2020-05-15 12:07:23Z raasch
! bugfix for restart data format query
!
! 4496 2020-04-15 08:37:26Z raasch
! bugfix: coupling character added to restart output filename
!
! 4495 2020-04-13 20:11:20Z raasch
! restart data handling with MPI-IO added
!
! 4457 2020-03-11 14:20:43Z raasch
! use statement for exchange horiz added
!
! 4444 2020-03-05 15:59:50Z raasch
! bugfix: cpp-directives for serial mode added
!
! 4414 2020-02-19 20:16:04Z suehring
! Call to module_interface_init_numerics
!
! 4400 2020-02-10 20:32:41Z suehring
! Add interface to initialize data output with dom
!
! 4360 2020-01-07 11:25:50Z suehring
! implement new palm_date_time_mod
!
! 4094 2019-07-12 09:24:21Z gronemeier
! Corrected "Former revisions" section
!
! 4039 2019-06-18 10:32:41Z suehring
! Rename subroutines in module for diagnostic quantities
!
! 4017 2019-06-06 12:16:46Z schwenkel
! new module for calculation and output of diagnostic quantities added
!
! 3885 2019-04-11 11:29:34Z kanani
! Changes related to global restructuring of location messages and introduction
! of additional debug messages
!
! 3761 2019-02-25 15:31:42Z raasch
! unused variable removed
!
! 3719 2019-02-06 13:10:18Z kanani
! Included cpu measurement for wall/soil spinup
!
! 3703 2019-01-29 16:43:53Z knoop
! Some interface calls moved to module_interface + cleanup
!
! 3648 2019-01-02 16:35:46Z suehring
! Rename subroutines for surface-data output
!
! Revision 1.1  1997/07/24 11:23:35  raasch
! Initial revision
!
!
! Description:
! ------------
!> Large-Eddy Simulation (LES) model for atmospheric and oceanic boundary-layer flows,
!> see the PALM homepage https://palm-model.org for further information
!--------------------------------------------------------------------------------------------------!
 PROGRAM palm


    USE arrays_3d

#if defined( __parallel )
    USE bulk_cloud_model_mod,                                                                      &
        ONLY: bulk_cloud_model, microphysics_morrison, microphysics_seifert
#endif

    USE control_parameters,                                                                        &
        ONLY:  coupling_char, do2d_at_begin, do3d_at_begin, io_blocks, io_group, message_string,   &
               restart_data_format_output, runnr, simulated_time_chr, spinup,                      &
               time_since_reference_point, user_interface_current_revision,                        &
               user_interface_required_revision, version, write_binary

#if defined( __parallel )
    USE control_parameters,                                                                        &
        ONLY:  child_domain, constant_diffusion, humidity, initializing_actions, neutral,          &
               passive_scalar
#endif

    USE cpulog,                                                                                    &
        ONLY:  cpu_log, cpu_statistics, log_point

#if defined( __parallel )
    USE cpulog,                                                                                    &
        ONLY:  log_point_s
#endif

    USE diagnostic_output_quantities_mod,                                                          &
        ONLY:  doq_calculate

#if defined( __parallel )
    USE exchange_horiz_mod,                                                                        &
        ONLY:  exchange_horiz

    USE indices,                                                                                   &
        ONLY:  nbgp
#endif

    USE kinds

    USE module_interface,                                                                          &
        ONLY:  module_interface_init_numerics,                                                     &
               module_interface_init_output,                                                       &
               module_interface_last_actions


    USE multi_agent_system_mod,                                                                    &
        ONLY:  agents_active, mas_last_actions

    USE netcdf_data_input_mod,                                                                     &
        ONLY:  netcdf_data_input_inquire_file, netcdf_data_input_init,                             &
               netcdf_data_input_surface_data, netcdf_data_input_topo

    USE pegrid

#if defined( __parallel )
    USE pmc_particle_interface,                                                                    &
        ONLY: pmcp_g_alloc_win

    USE pmc_interface,                                                                             &
        ONLY:  nested_run, pmci_child_initialize, pmci_init, pmci_modelconfiguration,              &
               pmci_parent_initialize
#endif

    USE restart_data_mpi_io_mod,                                                                   &
        ONLY:  rd_mpi_io_close, rd_mpi_io_open

    USE surface_data_output_mod,                                                                   &
        ONLY:  surface_data_output_last_action

    USE write_restart_data_mod,                                                                    &
        ONLY:  wrd_global, wrd_local

#if defined( __parallel )  &&  defined( _OPENACC )
    USE openacc
#endif


    IMPLICIT NONE

!
!-- Local variables
    CHARACTER(LEN=9) ::  time_to_string  !<

    INTEGER(iwp)     ::  i                   !< loop counter for blocked I/O
#if defined( __parallel) && defined( _OPENACC )
    INTEGER(acc_device_kind) :: device_type      !< device type for OpenACC
    INTEGER(iwp)             :: local_comm       !< local communicator (shared memory)
    INTEGER(iwp)             :: local_num_procs  !< local number of processes
    INTEGER(iwp)             :: local_id         !< local id
    INTEGER(iwp)             ::  num_devices     !< number of devices visible to OpenACC
    INTEGER(iwp)             ::  my_device       !< device used by this process
#endif

    version = 'PALM 6.0'
    user_interface_required_revision = 'r4495'

#if defined( __parallel )
!
!-- MPI initialisation. comm2d is preliminary set, because it will be defined in init_pegrid but is
!-- used before in cpu_log.
    CALL MPI_INIT( ierr )

!
!-- Initialize the coupling for nested-domain runs comm_palm is the communicator which includes all
!-- PEs (MPI processes) available for this (nested) model. If it is not a nested run, comm_palm is
!-- returned as MPI_COMM_WORLD.
    CALL cpu_log( log_point_s(70), 'pmci_init', 'start' )
    CALL pmci_init( comm_palm )
    CALL cpu_log( log_point_s(70), 'pmci_init', 'stop' )
    comm2d = comm_palm
!
!-- Get the (preliminary) number of MPI processes and the local PE-id (in case of a further
!-- communicator splitting in init_coupling, these numbers will be changed in init_pegrid).
    IF ( nested_run )  THEN

       CALL MPI_COMM_SIZE( comm_palm, numprocs, ierr )
       CALL MPI_COMM_RANK( comm_palm, myid, ierr )

    ELSE

       CALL MPI_COMM_SIZE( MPI_COMM_WORLD, numprocs, ierr )
       CALL MPI_COMM_RANK( MPI_COMM_WORLD, myid, ierr )
!
!--    Initialize PE topology in case of coupled atmosphere-ocean runs (comm_palm will be splitted
!--    in init_coupling)
       CALL init_coupling
    ENDIF

#ifdef _OPENACC
!
!-- Select OpenACC device to use in this process. For this find out how many neighbors there are
!-- running on the same node and which id this process is.
    IF ( nested_run )  THEN
       CALL MPI_COMM_SPLIT_TYPE( comm_palm, MPI_COMM_TYPE_SHARED, 0, MPI_INFO_NULL, local_comm,    &
                                 ierr )
    ELSE
       CALL MPI_COMM_SPLIT_TYPE( MPI_COMM_WORLD, MPI_COMM_TYPE_SHARED, 0, MPI_INFO_NULL,           &
                                 local_comm, ierr )
    ENDIF
    CALL MPI_COMM_SIZE( local_comm, local_num_procs, ierr )
    CALL MPI_COMM_RANK( local_comm, local_id, ierr )

!
!-- This loop including the barrier is a workaround for PGI compiler versions up to and including
!-- 18.4. Later releases are able to select their GPUs in parallel, without running into spurious
!-- errors.
    DO i = 0, local_num_procs-1
       CALL MPI_BARRIER( local_comm, ierr )

       IF ( i == local_id )  THEN
          device_type = acc_get_device_type()
          num_devices = acc_get_num_devices( device_type )
          my_device = MOD( local_id, num_devices )
          CALL acc_set_device_num( my_device, device_type )
       ENDIF
    ENDDO

    CALL MPI_COMM_FREE( local_comm, ierr )
#endif
#endif

!
!-- Initialize measuring of the CPU-time remaining to the run
    CALL local_tremain_ini

!
!-- Start of total CPU time measuring.
    CALL cpu_log( log_point(1), 'total', 'start' )
    CALL cpu_log( log_point(2), 'initialisation', 'start' )

!
!-- Open a file for debug output
    WRITE (myid_char,'(''_'',I6.6)')  myid
    OPEN( 9, FILE='DEBUG'//TRIM( coupling_char )//myid_char, FORM='FORMATTED' )

!
!-- Initialize dvrp logging. Also, one PE maybe split from the global communicator for doing the
!-- dvrp output. In that case, the number of PEs available for PALM is reduced by one and
!-- communicator comm_palm is changed respectively.
#if defined( __parallel )
    CALL MPI_COMM_RANK( comm_palm, myid, ierr )
#endif

!
!-- Read control parameters from NAMELIST files and read environment-variables
    CALL parin

!
!-- Check for the user's interface version
    IF ( user_interface_current_revision /= user_interface_required_revision )  THEN
       message_string = 'current user-interface revision "' //                                     &
                        TRIM( user_interface_current_revision ) // '" does ' //                    &
                        'not match the required revision ' //                                      &
                        TRIM( user_interface_required_revision )
        CALL message( 'palm', 'PA0169', 1, 2, 0, 6, 0 )
    ENDIF

!
!-- Determine processor topology and local array indices
    CALL init_pegrid
!
!-- Check if input file according to input-data standard exists
    CALL netcdf_data_input_inquire_file
!
!-- Read topography input data if required. This is required before the numerical grid is finally
!-- created in init_grid.
    CALL netcdf_data_input_topo
!
!-- Generate grid parameters, initialize generic topography and further process topography
!-- information if required.
    CALL init_grid
!
!-- Initialize boundary conditions and numerics such as the multigrid solver or the advection
!-- routine
    CALL module_interface_init_numerics
!
!-- Read global attributes if available.
    CALL netcdf_data_input_init
!
!-- Read surface classification data, e.g. vegetation and soil types, water surfaces, etc., if
!-- available. Some of these data is required before check parameters is invoked.
    CALL netcdf_data_input_surface_data
!
!-- Check control parameters and deduce further quantities
    CALL check_parameters

    CALL init_3d_model

    CALL module_interface_init_output

#if defined( __parallel )
!
!-- Coupling protocol setup for nested-domain runs
    IF ( nested_run )  THEN
       CALL pmci_modelconfiguration
!
!--    Receive and interpolate initial data on children.
!--    Child initialization must be made first if the model is both child and parent if necessary.
       IF ( TRIM( initializing_actions ) /= 'read_restart_data' )  THEN
          CALL pmci_child_initialize
!
!--       Send initial condition data from parent to children
          CALL pmci_parent_initialize
!
!--       Exchange_horiz is needed after the nest initialization
          IF ( child_domain )  THEN
             CALL exchange_horiz( u, nbgp )
             CALL exchange_horiz( v, nbgp )
             CALL exchange_horiz( w, nbgp )
             IF ( .NOT. neutral )  THEN
                CALL exchange_horiz( pt, nbgp )
             ENDIF
             IF ( .NOT. constant_diffusion )  CALL exchange_horiz( e, nbgp )
             IF ( humidity )  THEN
                CALL exchange_horiz( q, nbgp )
                IF ( bulk_cloud_model  .AND.  microphysics_morrison )  THEN
                  CALL exchange_horiz( qc, nbgp )
                  CALL exchange_horiz( nc, nbgp )
                ENDIF
                IF ( bulk_cloud_model  .AND.  microphysics_seifert )  THEN
                   CALL exchange_horiz( qr, nbgp )
                   CALL exchange_horiz( nr, nbgp )
                ENDIF
             ENDIF
             IF ( passive_scalar )  CALL exchange_horiz( s, nbgp )
          ENDIF
       ENDIF

       CALL pmcp_g_alloc_win                    ! Must be called after pmci_child_initialize and pmci_parent_initialize
    ENDIF
#endif

!
!-- Output of program header
    IF ( myid == 0 )  CALL header

    CALL cpu_log( log_point(2), 'initialisation', 'stop' )

!
!-- Integration of the non-atmospheric equations (land surface model, urban surface model)
    IF ( spinup )  THEN
       CALL cpu_log( log_point(41), 'wall/soil spinup', 'start' )
       CALL time_integration_spinup
       CALL cpu_log( log_point(41), 'wall/soil spinup', 'stop' )
    ENDIF

!
!-- Set start time in format hh:mm:ss
    simulated_time_chr = time_to_string( time_since_reference_point )

!
!-- If required, output of initial arrays
    IF ( do2d_at_begin )  THEN
       CALL doq_calculate    !TODO, will be called twice

       CALL data_output_2d( 'xy', 0 )
       CALL data_output_2d( 'xz', 0 )
       CALL data_output_2d( 'yz', 0 )
    ENDIF

    IF ( do3d_at_begin )  THEN
       CALL doq_calculate    !TODO, will be called twice

       CALL data_output_3d( 0 )
    ENDIF

!
!-- Integration of the model equations using timestep-scheme
    CALL time_integration

!
!-- If required, write binary data for restart runs
    IF ( write_binary )  THEN

       CALL cpu_log( log_point(22), 'write-restart-data', 'start' )

       CALL location_message( 'writing restart data', 'start' )

       IF ( TRIM( restart_data_format_output ) == 'fortran_binary' )  THEN

          DO  i = 0, io_blocks-1
             IF ( i == io_group )  THEN

!
!--             Open binary file
                CALL check_open( 14 )
!
!--             Write control parameters and other global variables for restart.
                IF ( myid == 0 )  CALL wrd_global
!
!--             Write processor specific flow field data for restart runs
                CALL wrd_local
!
!--             Close binary file
                CALL close_file( 14 )

             ENDIF
#if defined( __parallel )
             CALL MPI_BARRIER( comm2d, ierr )
#endif
          ENDDO

       ELSEIF ( restart_data_format_output(1:3) == 'mpi' )  THEN
!
!--       Open MPI-IO restart file
          CALL rd_mpi_io_open( 'write', 'BINOUT' // TRIM( coupling_char ) )
!
!--       Write control parameters and other global variables for restart.
          CALL wrd_global
!
!--       Write processor specific flow field data for restart runs
          CALL wrd_local
!
!--       Close restart File
          CALL rd_mpi_io_close

       ENDIF

       CALL location_message( 'writing restart data', 'finished' )

       CALL cpu_log( log_point(22), 'write-restart-data', 'stop' )

    ENDIF
!
!-- Last actions for surface output, for instantaneous and time-averaged data
    CALL surface_data_output_last_action( 0 )
    CALL surface_data_output_last_action( 1 )

!
!-- If required, repeat output of header including the required CPU-time
    IF ( myid == 0 )  CALL header
!
!-- Perform module specific last actions
    CALL cpu_log( log_point(4), 'last actions', 'start' )

    IF ( myid == 0 .AND. agents_active )  CALL mas_last_actions ! ToDo: move to module_interface

    CALL module_interface_last_actions

    CALL cpu_log( log_point(4), 'last actions', 'stop' )

!
!-- Close files
    CALL close_file( 0 )

!
!-- Write run number to file (used by palmrun to create unified cycle numbers for output files).
    IF ( myid == 0  .AND.  runnr > 0 )  THEN
       OPEN( 90, FILE='RUN_NUMBER', FORM='FORMATTED' )
       WRITE( 90, '(I4)' )  runnr
       CLOSE( 90 )
    ENDIF

!
!-- Take final CPU-time for CPU-time analysis
    CALL cpu_log( log_point(1), 'total', 'stop' )
    CALL cpu_statistics

#if defined( __parallel )
    CALL MPI_FINALIZE( ierr )
#endif

 END PROGRAM palm