| 1 | MODULE nemogcm |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE nemogcm *** |
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| 4 | !! Off-line Ocean : passive tracer evolution, dynamics read in files |
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| 5 | !!====================================================================== |
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| 6 | !! History : 3.3 ! 2010-05 (C. Ethe) Full reorganization of the off-line: phasing with the on-line |
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| 7 | !! 4.0 ! 2011-01 (C. Ethe, A. R. Porter, STFC Daresbury) dynamical allocation |
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| 8 | !!---------------------------------------------------------------------- |
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| 9 | |
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| 10 | !!---------------------------------------------------------------------- |
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| 11 | !! nemo_gcm : off-line: solve ocean tracer only |
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| 12 | !! nemo_init : initialization of the nemo model |
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| 13 | !! nemo_ctl : initialisation of algorithm flag |
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| 14 | !! nemo_closefile : close remaining files |
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| 15 | !!---------------------------------------------------------------------- |
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| 16 | USE dom_oce ! ocean space domain variables |
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| 17 | USE oce ! dynamics and tracers variables |
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| 18 | USE c1d ! 1D configuration |
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| 19 | USE domcfg ! domain configuration (dom_cfg routine) |
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| 20 | USE domain ! domain initialization (dom_init routine) |
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| 21 | USE istate ! initial state setting (istate_init routine) |
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| 22 | USE eosbn2 ! equation of state (eos bn2 routine) |
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| 23 | ! ! ocean physics |
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| 24 | USE ldftra ! lateral diffusivity setting (ldf_tra_init routine) |
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| 25 | USE ldfslp ! slopes of neutral surfaces (ldf_slp_init routine) |
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| 26 | USE traqsr ! solar radiation penetration (tra_qsr_init routine) |
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| 27 | USE trabbl ! bottom boundary layer (tra_bbl_init routine) |
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| 28 | USE zdfini ! vertical physics: initialization |
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| 29 | USE sbcmod ! surface boundary condition (sbc_init routine) |
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| 30 | USE phycst ! physical constant (par_cst routine) |
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| 31 | USE dtadyn ! Lecture and Interpolation of the dynamical fields |
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| 32 | USE trcini ! Initilization of the passive tracers |
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| 33 | USE daymod ! calendar (day routine) |
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| 34 | USE trcstp ! passive tracer time-stepping (trc_stp routine) |
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| 35 | USE dtadyn ! Lecture and interpolation of the dynamical fields |
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| 36 | USE stpctl ! time stepping control (stp_ctl routine) |
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| 37 | ! ! I/O & MPP |
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| 38 | USE iom ! I/O library |
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| 39 | USE in_out_manager ! I/O manager |
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| 40 | USE mppini ! shared/distributed memory setting (mpp_init routine) |
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| 41 | USE lib_mpp ! distributed memory computing |
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| 42 | #if defined key_iomput |
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| 43 | USE mod_ioclient |
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| 44 | #endif |
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| 45 | |
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| 46 | IMPLICIT NONE |
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| 47 | PRIVATE |
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| 48 | |
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| 49 | PUBLIC nemo_gcm ! called by nemo.F90 |
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| 50 | |
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| 51 | CHARACTER (len=64) :: cform_aaa="( /, 'AAAAAAAA', / ) " ! flag for output listing |
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| 52 | |
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| 53 | !!---------------------------------------------------------------------- |
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| 54 | !! NEMO/OFF 3.3 , NEMO Consortium (2010) |
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| 55 | !! $Id: nemogcm.F90 2528 2010-12-27 17:33:53Z rblod $ |
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| 56 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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| 57 | !!---------------------------------------------------------------------- |
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| 58 | CONTAINS |
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| 59 | |
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| 60 | SUBROUTINE nemo_gcm |
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| 61 | !!---------------------------------------------------------------------- |
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| 62 | !! *** ROUTINE nemo_gcm *** |
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| 63 | !! |
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| 64 | !! ** Purpose : nemo solves the primitive equations on an orthogonal |
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| 65 | !! curvilinear mesh on the sphere. |
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| 66 | !! |
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| 67 | !! ** Method : - model general initialization |
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| 68 | !! - launch the time-stepping (dta_dyn and trc_stp) |
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| 69 | !! - finalize the run by closing files and communications |
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| 70 | !! |
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| 71 | !! References : Madec, Delecluse,Imbard, and Levy, 1997: internal report, IPSL. |
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| 72 | !! Madec, 2008, internal report, IPSL. |
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| 73 | !!---------------------------------------------------------------------- |
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| 74 | INTEGER :: istp, indic ! time step index |
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| 75 | !!---------------------------------------------------------------------- |
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| 76 | |
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| 77 | CALL nemo_init ! Initializations |
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| 78 | |
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| 79 | IF( lk_mpp ) CALL mpp_max( nstop ) |
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| 80 | |
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| 81 | ! check that all process are still there... If some process have an error, |
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| 82 | ! they will never enter in step and other processes will wait until the end of the cpu time! |
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| 83 | IF( lk_mpp ) CALL mpp_max( nstop ) |
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| 84 | |
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| 85 | ! !-----------------------! |
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| 86 | ! !== time stepping ==! |
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| 87 | ! !-----------------------! |
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| 88 | istp = nit000 |
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| 89 | ! |
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| 90 | DO WHILE ( istp <= nitend .AND. nstop == 0 ) ! time stepping |
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| 91 | ! |
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| 92 | IF( istp /= nit000 ) CALL day ( istp ) ! Calendar (day was already called at nit000 in day_init) |
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| 93 | CALL iom_setkt( istp ) ! say to iom that we are at time step kstp |
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| 94 | CALL dta_dyn ( istp ) ! Interpolation of the dynamical fields |
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| 95 | CALL trc_stp ( istp ) ! time-stepping |
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| 96 | CALL stp_ctl ( istp, indic ) ! Time loop: control and print |
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| 97 | istp = istp + 1 |
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| 98 | IF( lk_mpp ) CALL mpp_max( nstop ) |
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| 99 | END DO |
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| 100 | |
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| 101 | ! !------------------------! |
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| 102 | ! !== finalize the run ==! |
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| 103 | ! !------------------------! |
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| 104 | IF(lwp) WRITE(numout,cform_aaa) ! Flag AAAAAAA |
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| 105 | |
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| 106 | IF( nstop /= 0 .AND. lwp ) THEN ! error print |
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| 107 | WRITE(numout,cform_err) |
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| 108 | WRITE(numout,*) nstop, ' error have been found' |
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| 109 | ENDIF |
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| 110 | ! |
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| 111 | CALL nemo_closefile |
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| 112 | ! |
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| 113 | IF( lk_mpp ) CALL mppstop ! Close all files (mpp) |
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| 114 | ! |
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| 115 | END SUBROUTINE nemo_gcm |
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| 116 | |
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| 117 | |
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| 118 | SUBROUTINE nemo_init |
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| 119 | !!---------------------------------------------------------------------- |
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| 120 | !! *** ROUTINE nemo_init *** |
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| 121 | !! |
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| 122 | !! ** Purpose : initialization of the nemo model in off-line mode |
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| 123 | !!---------------------------------------------------------------------- |
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| 124 | INTEGER :: ji ! dummy loop indices |
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| 125 | INTEGER :: ilocal_comm ! local integer |
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| 126 | CHARACTER(len=80), DIMENSION(10) :: cltxt = '' |
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| 127 | !! |
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| 128 | NAMELIST/namctl/ ln_ctl , nn_print, nn_ictls, nn_ictle, & |
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| 129 | & nn_isplt, nn_jsplt, nn_jctls, nn_jctle, nn_bench |
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| 130 | !!---------------------------------------------------------------------- |
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| 131 | ! |
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| 132 | ! ! open Namelist file |
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| 133 | CALL ctl_opn( numnam, 'namelist', 'OLD', 'FORMATTED', 'SEQUENTIAL', -1, 6, .FALSE. ) |
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| 134 | ! |
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| 135 | READ( numnam, namctl ) ! Namelist namctl : Control prints & Benchmark |
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| 136 | ! |
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| 137 | ! !--------------------------------------------! |
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| 138 | ! ! set communicator & select the local node ! |
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| 139 | ! !--------------------------------------------! |
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| 140 | #if defined key_iomput |
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| 141 | CALL init_ioclient( ilocal_comm ) ! exchange io_server nemo local communicator with the io_server |
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| 142 | narea = mynode( cltxt, numnam, nstop, ilocal_comm ) ! Nodes selection |
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| 143 | #else |
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| 144 | ilocal_comm = 0 |
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| 145 | narea = mynode( cltxt, numnam, nstop ) ! Nodes selection (control print return in cltxt) |
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| 146 | #endif |
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| 147 | |
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| 148 | narea = narea + 1 ! mynode return the rank of proc (0 --> jpnij -1 ) |
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| 149 | |
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| 150 | lwp = (narea == 1) .OR. ln_ctl ! control of all listing output print |
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| 151 | |
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| 152 | ! Decide on size of grid now that we have our communicator size |
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| 153 | ! If we're not using dynamic memory then mpp_partition does nothing. |
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| 154 | |
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| 155 | #if defined key_mpp_mpi || defined key_mpp_shmem |
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| 156 | CALL nemo_partition(mppsize) |
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| 157 | #else |
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| 158 | jpni = 1 |
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| 159 | jpnj = 1 |
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| 160 | jpnij = jpni*jpnj |
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| 161 | #endif |
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| 162 | ! Calculate domain dimensions given calculated jpni and jpnj |
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| 163 | ! This used to be done in par_oce.F90 when they were parameters rather |
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| 164 | ! than variables |
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| 165 | jpi = ( jpiglo-2*jpreci + (jpni-1) ) / jpni + 2*jpreci !: first dim. |
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| 166 | jpj = ( jpjglo-2*jprecj + (jpnj-1) ) / jpnj + 2*jprecj !: second dim. |
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| 167 | jpim1 = jpi-1 !: inner domain indices |
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| 168 | jpjm1 = jpj-1 !: " " |
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| 169 | jpkm1 = jpk-1 !: " " |
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| 170 | jpij = jpi*jpj !: jpi x j |
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| 171 | |
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| 172 | ! Now we know the dimensions of the grid, allocate arrays |
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| 173 | CALL nemo_alloc() |
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| 174 | |
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| 175 | IF(lwp) THEN ! open listing units |
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| 176 | ! |
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| 177 | CALL ctl_opn( numout, 'ocean.output', 'REPLACE', 'FORMATTED', 'SEQUENTIAL', -1, 6, .FALSE., narea ) |
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| 178 | ! |
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| 179 | WRITE(numout,*) |
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| 180 | WRITE(numout,*) ' CNRS - NERC - Met OFFICE - MERCATOR-ocean' |
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| 181 | WRITE(numout,*) ' NEMO team' |
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| 182 | WRITE(numout,*) ' Ocean General Circulation Model' |
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| 183 | WRITE(numout,*) ' version 3.3 (2010) ' |
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| 184 | WRITE(numout,*) |
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| 185 | WRITE(numout,*) |
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| 186 | DO ji = 1, SIZE(cltxt) |
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| 187 | IF( TRIM(cltxt(ji)) /= '' ) WRITE(numout,*) cltxt(ji) ! control print of mynode |
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| 188 | END DO |
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| 189 | WRITE(numout,cform_aaa) ! Flag AAAAAAA |
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| 190 | ! |
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| 191 | ENDIF |
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| 192 | ! !--------------------------------! |
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| 193 | ! ! Model general initialization ! |
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| 194 | ! !--------------------------------! |
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| 195 | |
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| 196 | CALL nemo_ctl ! Control prints & Benchmark |
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| 197 | |
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| 198 | ! ! Domain decomposition |
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| 199 | IF( jpni*jpnj == jpnij ) THEN ; CALL mpp_init ! standard cutting out |
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| 200 | ELSE ; CALL mpp_init2 ! eliminate land processors |
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| 201 | ENDIF |
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| 202 | ! |
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| 203 | ! ! General initialization |
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| 204 | CALL phy_cst ! Physical constants |
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| 205 | CALL eos_init ! Equation of state |
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| 206 | CALL dom_cfg ! Domain configuration |
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| 207 | CALL dom_init ! Domain |
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| 208 | CALL istate_init ! ocean initial state (Dynamics and tracers) |
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| 209 | |
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| 210 | ! ! Ocean physics |
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| 211 | CALL sbc_init ! Forcings : surface module |
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| 212 | #if ! defined key_degrad |
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| 213 | CALL ldf_tra_init ! Lateral ocean tracer physics |
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| 214 | #endif |
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| 215 | IF( lk_ldfslp ) CALL ldf_slp_init ! slope of lateral mixing |
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| 216 | |
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| 217 | ! ! Active tracers |
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| 218 | CALL tra_qsr_init ! penetrative solar radiation qsr |
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| 219 | IF( lk_trabbl ) CALL tra_bbl_init ! advective (and/or diffusive) bottom boundary layer scheme |
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| 220 | |
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| 221 | ! ! Passive tracers |
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| 222 | CALL trc_init ! Passive tracers initialization |
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| 223 | ! ! Dynamics |
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| 224 | CALL dta_dyn_init ! Initialization for the dynamics |
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| 225 | CALL iom_init ! iom_put initialization |
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| 226 | |
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| 227 | IF(lwp) WRITE(numout,cform_aaa) ! Flag AAAAAAA |
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| 228 | ! |
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| 229 | END SUBROUTINE nemo_init |
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| 230 | |
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| 231 | |
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| 232 | SUBROUTINE nemo_ctl |
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| 233 | !!---------------------------------------------------------------------- |
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| 234 | !! *** ROUTINE nemo_ctl *** |
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| 235 | !! |
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| 236 | !! ** Purpose : control print setting |
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| 237 | !! |
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| 238 | !! ** Method : - print namctl information and check some consistencies |
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| 239 | !!---------------------------------------------------------------------- |
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| 240 | ! |
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| 241 | IF(lwp) THEN ! Parameter print |
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| 242 | WRITE(numout,*) |
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| 243 | WRITE(numout,*) 'nemo_flg: Control prints & Benchmark' |
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| 244 | WRITE(numout,*) '~~~~~~~ ' |
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| 245 | WRITE(numout,*) ' Namelist namctl' |
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| 246 | WRITE(numout,*) ' run control (for debugging) ln_ctl = ', ln_ctl |
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| 247 | WRITE(numout,*) ' level of print nn_print = ', nn_print |
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| 248 | WRITE(numout,*) ' Start i indice for SUM control nn_ictls = ', nn_ictls |
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| 249 | WRITE(numout,*) ' End i indice for SUM control nn_ictle = ', nn_ictle |
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| 250 | WRITE(numout,*) ' Start j indice for SUM control nn_jctls = ', nn_jctls |
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| 251 | WRITE(numout,*) ' End j indice for SUM control nn_jctle = ', nn_jctle |
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| 252 | WRITE(numout,*) ' number of proc. following i nn_isplt = ', nn_isplt |
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| 253 | WRITE(numout,*) ' number of proc. following j nn_jsplt = ', nn_jsplt |
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| 254 | WRITE(numout,*) ' benchmark parameter (0/1) nn_bench = ', nn_bench |
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| 255 | ENDIF |
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| 256 | ! |
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| 257 | nprint = nn_print ! convert DOCTOR namelist names into OLD names |
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| 258 | nictls = nn_ictls |
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| 259 | nictle = nn_ictle |
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| 260 | njctls = nn_jctls |
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| 261 | njctle = nn_jctle |
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| 262 | isplt = nn_isplt |
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| 263 | jsplt = nn_jsplt |
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| 264 | nbench = nn_bench |
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| 265 | ! ! Parameter control |
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| 266 | ! |
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| 267 | IF( ln_ctl ) THEN ! sub-domain area indices for the control prints |
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| 268 | IF( lk_mpp ) THEN |
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| 269 | isplt = jpni ; jsplt = jpnj ; ijsplt = jpni*jpnj ! the domain is forced to the real splitted domain |
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| 270 | ELSE |
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| 271 | IF( isplt == 1 .AND. jsplt == 1 ) THEN |
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| 272 | CALL ctl_warn( ' - isplt & jsplt are equal to 1', & |
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| 273 | & ' - the print control will be done over the whole domain' ) |
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| 274 | ENDIF |
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| 275 | ijsplt = isplt * jsplt ! total number of processors ijsplt |
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| 276 | ENDIF |
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| 277 | IF(lwp) WRITE(numout,*)' - The total number of processors over which the' |
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| 278 | IF(lwp) WRITE(numout,*)' print control will be done is ijsplt : ', ijsplt |
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| 279 | ! |
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| 280 | ! ! indices used for the SUM control |
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| 281 | IF( nictls+nictle+njctls+njctle == 0 ) THEN ! print control done over the default area |
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| 282 | lsp_area = .FALSE. |
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| 283 | ELSE ! print control done over a specific area |
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| 284 | lsp_area = .TRUE. |
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| 285 | IF( nictls < 1 .OR. nictls > jpiglo ) THEN |
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| 286 | CALL ctl_warn( ' - nictls must be 1<=nictls>=jpiglo, it is forced to 1' ) |
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| 287 | nictls = 1 |
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| 288 | ENDIF |
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| 289 | IF( nictle < 1 .OR. nictle > jpiglo ) THEN |
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| 290 | CALL ctl_warn( ' - nictle must be 1<=nictle>=jpiglo, it is forced to jpiglo' ) |
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| 291 | nictle = jpiglo |
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| 292 | ENDIF |
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| 293 | IF( njctls < 1 .OR. njctls > jpjglo ) THEN |
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| 294 | CALL ctl_warn( ' - njctls must be 1<=njctls>=jpjglo, it is forced to 1' ) |
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| 295 | njctls = 1 |
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| 296 | ENDIF |
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| 297 | IF( njctle < 1 .OR. njctle > jpjglo ) THEN |
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| 298 | CALL ctl_warn( ' - njctle must be 1<=njctle>=jpjglo, it is forced to jpjglo' ) |
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| 299 | njctle = jpjglo |
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| 300 | ENDIF |
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| 301 | ENDIF |
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| 302 | ENDIF |
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| 303 | ! |
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| 304 | IF( nbench == 1 ) THEN ! Benchmark |
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| 305 | SELECT CASE ( cp_cfg ) |
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| 306 | CASE ( 'gyre' ) ; CALL ctl_warn( ' The Benchmark is activated ' ) |
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| 307 | CASE DEFAULT ; CALL ctl_stop( ' The Benchmark is based on the GYRE configuration:', & |
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| 308 | & ' key_gyre must be used or set nbench = 0' ) |
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| 309 | END SELECT |
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| 310 | ENDIF |
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| 311 | ! |
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| 312 | IF( lk_c1d .AND. .NOT.lk_iomput ) CALL ctl_stop( 'nemo_ctl: The 1D configuration must be used ', & |
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| 313 | & 'with the IOM Input/Output manager. ' , & |
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| 314 | & 'Compile with key_iomput enabled' ) |
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| 315 | ! |
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| 316 | END SUBROUTINE nemo_ctl |
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| 317 | |
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| 318 | |
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| 319 | SUBROUTINE nemo_closefile |
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| 320 | !!---------------------------------------------------------------------- |
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| 321 | !! *** ROUTINE nemo_closefile *** |
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| 322 | !! |
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| 323 | !! ** Purpose : Close the files |
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| 324 | !!---------------------------------------------------------------------- |
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| 325 | ! |
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| 326 | IF ( lk_mpp ) CALL mppsync |
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| 327 | ! |
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| 328 | CALL iom_close ! close all input/output files managed by iom_* |
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| 329 | ! |
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| 330 | IF( numstp /= -1 ) CLOSE( numstp ) ! time-step file |
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| 331 | IF( numnam /= -1 ) CLOSE( numnam ) ! oce namelist |
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| 332 | IF( numout /= 6 ) CLOSE( numout ) ! standard model output file |
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| 333 | numout = 6 ! redefine numout in case it is used after this point... |
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| 334 | ! |
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| 335 | END SUBROUTINE nemo_closefile |
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| 336 | |
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| 337 | SUBROUTINE nemo_alloc |
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| 338 | !!---------------------------------------------------------------------- |
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| 339 | !! *** ROUTINE nemo_alloc *** |
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| 340 | !! |
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| 341 | !! ** Purpose : Allocate all the dynamic arrays of the OPA modules |
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| 342 | !! |
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| 343 | !! ** Method : |
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| 344 | !!---------------------------------------------------------------------- |
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| 345 | USE diawri, ONLY: dia_wri_alloc |
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| 346 | USE dom_oce, ONLY: dom_oce_alloc |
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| 347 | USE zdf_oce, ONLY: zdf_oce_alloc |
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| 348 | USE zdfmxl, ONLY: zdf_mxl_alloc |
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| 349 | USE ldftra_oce, ONLY: ldftra_oce_alloc |
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| 350 | USE trc_oce, ONLY: trc_oce_alloc |
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| 351 | |
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| 352 | USE wrk_nemo, ONLY: wrk_alloc |
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| 353 | |
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| 354 | INTEGER :: ierr |
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| 355 | !!---------------------------------------------------------------------- |
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| 356 | |
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| 357 | ierr = oce_alloc () ! ocean |
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| 358 | ierr = ierr + dia_wri_alloc () |
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| 359 | ierr = ierr + dom_oce_alloc () ! ocean domain |
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| 360 | ierr = ierr + ldftra_oce_alloc() ! ocean lateral physics : tracers |
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| 361 | ierr = ierr + zdf_oce_alloc () ! ocean vertical physics |
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| 362 | ierr = ierr + zdf_mxl_alloc () ! ocean vertical physics |
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| 363 | ! |
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| 364 | ierr = ierr + lib_mpp_alloc (numout) ! mpp exchanges |
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| 365 | ierr = ierr + trc_oce_alloc () ! shared TRC / TRA arrays |
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| 366 | ierr = ierr + wrk_alloc(numout, lwp) |
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| 367 | |
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| 368 | IF( lk_mpp ) CALL mpp_sum( ierr ) |
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| 369 | IF( ierr /= 0 ) CALL ctl_stop( 'STOP', 'nemo_alloc : unable to allocate standard ocean arrays' ) |
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| 370 | ! |
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| 371 | END SUBROUTINE nemo_alloc |
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| 372 | |
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| 373 | SUBROUTINE nemo_partition( num_pes ) |
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| 374 | !!---------------------------------------------------------------------- |
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| 375 | !! *** ROUTINE nemo_partition *** |
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| 376 | !! |
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| 377 | !! ** Purpose : |
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| 378 | !! |
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| 379 | !! ** Method : |
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| 380 | !!---------------------------------------------------------------------- |
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| 381 | USE par_oce |
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| 382 | INTEGER, INTENT(in) :: num_pes ! The number of MPI processes we have |
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| 383 | ! Local variables |
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| 384 | INTEGER, PARAMETER :: nfactmax = 20 |
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| 385 | INTEGER :: nfact ! The no. of factors returned |
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| 386 | INTEGER :: ierr ! Error flag |
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| 387 | INTEGER :: i |
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| 388 | INTEGER :: idiff, mindiff, imin ! For choosing pair of factors that are closest in value |
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| 389 | INTEGER, DIMENSION(nfactmax) :: ifact ! Array of factors |
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| 390 | !!---------------------------------------------------------------------- |
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| 391 | |
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| 392 | ierr = 0 |
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| 393 | |
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| 394 | CALL factorise( ifact, nfactmax, nfact, num_pes, ierr ) |
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| 395 | |
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| 396 | IF( nfact <= 1 ) THEN |
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| 397 | WRITE (numout, *) 'WARNING: factorisation of number of PEs failed' |
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| 398 | WRITE (numout, *) ' : using grid of ',num_pes,' x 1' |
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| 399 | jpnj = 1 |
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| 400 | jpni = num_pes |
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| 401 | ELSE |
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| 402 | ! Search through factors for the pair that are closest in value |
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| 403 | mindiff = 1000000 |
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| 404 | imin = 1 |
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| 405 | DO i=1,nfact-1,2 |
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| 406 | idiff = ABS(ifact(i) - ifact(i+1)) |
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| 407 | IF(idiff < mindiff)THEN |
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| 408 | mindiff = idiff |
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| 409 | imin = i |
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| 410 | END IF |
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| 411 | END DO |
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| 412 | jpnj = ifact(imin) |
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| 413 | jpni = ifact(imin + 1) |
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| 414 | ENDIF |
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| 415 | jpnij = jpni*jpnj |
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| 416 | |
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| 417 | WRITE(*,*) 'ARPDBG: jpni = ',jpni,'jpnj = ',jpnj,'jpnij = ',jpnij |
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| 418 | ! |
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| 419 | END SUBROUTINE nemo_partition |
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| 420 | |
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| 421 | |
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| 422 | SUBROUTINE factorise( ifax, maxfax, nfax, n, ierr ) |
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| 423 | !!---------------------------------------------------------------------- |
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| 424 | !! *** ROUTINE factorise *** |
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| 425 | !! |
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| 426 | !! ** Purpose : return the prime factors of n. |
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| 427 | !! nfax factors are returned in array ifax which is of |
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| 428 | !! maximum dimension maxfax. |
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| 429 | !! ** Method : |
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| 430 | !!---------------------------------------------------------------------- |
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| 431 | INTEGER, INTENT(in) :: n, maxfax |
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| 432 | INTEGER, INTENT(Out) :: ierr, nfax |
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| 433 | INTEGER, INTENT(out) :: ifax(maxfax) |
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| 434 | ! Local variables. |
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| 435 | INTEGER :: i, ifac, l, nu |
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| 436 | INTEGER, PARAMETER :: ntest = 14 |
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| 437 | INTEGER :: lfax(ntest) |
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| 438 | |
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| 439 | ! lfax contains the set of allowed factors. |
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| 440 | data (lfax(i),i=1,ntest) / 16384, 8192, 4096, 2048, 1024, 512, 256, & |
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| 441 | & 128, 64, 32, 16, 8, 4, 2 / |
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| 442 | !!---------------------------------------------------------------------- |
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| 443 | |
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| 444 | ! Clear the error flag and initialise output vars |
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| 445 | ierr = 0 |
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| 446 | ifax = 1 |
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| 447 | nfax = 0 |
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| 448 | |
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| 449 | ! Find the factors of n. |
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| 450 | IF( n == 1 ) GOTO 20 |
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| 451 | |
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| 452 | ! nu holds the unfactorised part of the number. |
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| 453 | ! nfax holds the number of factors found. |
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| 454 | ! l points to the allowed factor list. |
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| 455 | ! ifac holds the current factor. |
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| 456 | |
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| 457 | nu = n |
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| 458 | nfax = 0 |
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| 459 | |
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| 460 | DO l = ntest, 1, -1 |
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| 461 | ! |
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| 462 | ifac = lfax(l) |
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| 463 | IF(ifac > nu)CYCLE |
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| 464 | |
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| 465 | ! Test whether the factor will divide. |
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| 466 | |
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| 467 | IF( MOD(nu,ifac) == 0 ) THEN |
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| 468 | ! |
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| 469 | nfax = nfax+1 ! Add the factor to the list |
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| 470 | IF( nfax > maxfax ) THEN |
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| 471 | ierr = 6 |
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| 472 | write (*,*) 'FACTOR: insufficient space in factor array ',nfax |
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| 473 | return |
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| 474 | ENDIF |
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| 475 | ifax(nfax) = ifac |
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| 476 | ! Store the other factor that goes with this one |
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| 477 | nfax = nfax + 1 |
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| 478 | ifax(nfax) = nu / ifac |
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| 479 | !WRITE (*,*) 'ARPDBG, factors ',nfax-1,' & ',nfax,' are ', & |
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| 480 | ! ifax(nfax-1),' and ',ifax(nfax) |
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| 481 | ENDIF |
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| 482 | ! |
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| 483 | END DO |
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| 484 | |
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| 485 | 20 CONTINUE ! Label 20 is the exit point from the factor search loop. |
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| 486 | ! |
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| 487 | RETURN |
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| 488 | ! |
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| 489 | END SUBROUTINE factorise |
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| 490 | !!====================================================================== |
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| 491 | END MODULE nemogcm |
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