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nemogcm.F90 in branches/2013/dev_LOCEAN_CMCC_INGV_MERC_UKMO_2013/NEMOGCM/NEMO/SAS_SRC – NEMO

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source: branches/2013/dev_LOCEAN_CMCC_INGV_MERC_UKMO_2013/NEMOGCM/NEMO/SAS_SRC/nemogcm.F90 @ 4290

Last change on this file since 4290 was 4290, checked in by cetlod, 10 years ago
fix to lwp use for namelist reads
File size: 28.5 KB

Rev	Line
[3324]	1	MODULE nemogcm
	2	!!======================================================================
	3	!! * MODULE nemogcm *
	4	!! Ocean system : NEMO GCM (ocean dynamics, on-line tracers, biochemistry and sea-ice)
	5	!!======================================================================
	6	!! History : OPA ! 1990-10 (C. Levy, G. Madec) Original code
	7	!! 7.0 ! 1991-11 (M. Imbard, C. Levy, G. Madec)
	8	!! 7.1 ! 1993-03 (M. Imbard, C. Levy, G. Madec, O. Marti, M. Guyon, A. Lazar,
	9	!! P. Delecluse, C. Perigaud, G. Caniaux, B. Colot, C. Maes) release 7.1
	10	!! - ! 1992-06 (L.Terray) coupling implementation
	11	!! - ! 1993-11 (M.A. Filiberti) IGLOO sea-ice
	12	!! 8.0 ! 1996-03 (M. Imbard, C. Levy, G. Madec, O. Marti, M. Guyon, A. Lazar,
	13	!! P. Delecluse, L.Terray, M.A. Filiberti, J. Vialar, A.M. Treguier, M. Levy) release 8.0
	14	!! 8.1 ! 1997-06 (M. Imbard, G. Madec)
	15	!! 8.2 ! 1999-11 (M. Imbard, H. Goosse) LIM sea-ice model
	16	!! ! 1999-12 (V. Thierry, A-M. Treguier, M. Imbard, M-A. Foujols) OPEN-MP
	17	!! ! 2000-07 (J-M Molines, M. Imbard) Open Boundary Conditions (CLIPPER)
	18	!! NEMO 1.0 ! 2002-08 (G. Madec) F90: Free form and modules
	19	!! - ! 2004-06 (R. Redler, NEC CCRLE, Germany) add OASIS[3/4] coupled interfaces
	20	!! - ! 2004-08 (C. Talandier) New trends organization
	21	!! - ! 2005-06 (C. Ethe) Add the 1D configuration possibility
	22	!! - ! 2005-11 (V. Garnier) Surface pressure gradient organization
	23	!! - ! 2006-03 (L. Debreu, C. Mazauric) Agrif implementation
	24	!! - ! 2006-04 (G. Madec, R. Benshila) Step reorganization
	25	!! - ! 2007-07 (J. Chanut, A. Sellar) Unstructured open boundaries (BDY)
	26	!! 3.2 ! 2009-08 (S. Masson) open/write in the listing file in mpp
	27	!! 3.3 ! 2010-05 (K. Mogensen, A. Weaver, M. Martin, D. Lea) Assimilation interface
	28	!! - ! 2010-10 (C. Ethe, G. Madec) reorganisation of initialisation phase
	29	!! 3.3.1! 2011-01 (A. R. Porter, STFC Daresbury) dynamical allocation
	30	!! 3.4 ! 2011-11 (C. Harris) decomposition changes for running with CICE
	31	!!----------------------------------------------------------------------
	32
	33	!!----------------------------------------------------------------------
	34	!! nemo_gcm : solve ocean dynamics, tracer, biogeochemistry and/or sea-ice
	35	!! nemo_init : initialization of the NEMO system
	36	!! nemo_ctl : initialisation of the contol print
	37	!! nemo_closefile : close remaining open files
	38	!! nemo_alloc : dynamical allocation
	39	!! nemo_partition : calculate MPP domain decomposition
	40	!! factorise : calculate the factors of the no. of MPI processes
	41	!!----------------------------------------------------------------------
	42	USE step_oce ! module used in the ocean time stepping module
	43	USE sbc_oce ! surface boundary condition: ocean
	44	USE cla ! cross land advection (tra_cla routine)
	45	USE domcfg ! domain configuration (dom_cfg routine)
[3331]	46	USE daymod ! calendar
[3324]	47	USE mppini ! shared/distributed memory setting (mpp_init routine)
	48	USE domain ! domain initialization (dom_init routine)
	49	USE phycst ! physical constant (par_cst routine)
	50	USE step ! NEMO time-stepping (stp routine)
	51	USE lib_mpp ! distributed memory computing
	52	#if defined key_iomput
[3769]	53	USE xios
[3324]	54	#endif
[3362]	55	USE sbcssm
[4232]	56	USE lbcnfd, ONLY: isendto, nsndto ! Setup of north fold exchanges
[3324]	57
	58	IMPLICIT NONE
	59	PRIVATE
	60
	61	PUBLIC nemo_gcm ! called by model.F90
	62	PUBLIC nemo_init ! needed by AGRIF
	63
	64	CHARACTER(lc) :: cform_aaa="( /, 'AAAAAAAA', / ) " ! flag for output listing
	65
	66	!!----------------------------------------------------------------------
	67	!! NEMO/OPA 4.0 , NEMO Consortium (2011)
	68	!! $Id: nemogcm.F90 3294 2012-01-28 16:44:18Z rblod $
	69	!! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt)
	70	!!----------------------------------------------------------------------
	71	CONTAINS
	72
	73	SUBROUTINE nemo_gcm
	74	!!----------------------------------------------------------------------
	75	!! * ROUTINE nemo_gcm *
	76	!!
	77	!! ** Purpose : NEMO solves the primitive equations on an orthogonal
	78	!! curvilinear mesh on the sphere.
	79	!!
	80	!! ** Method : - model general initialization
	81	!! - launch the time-stepping (stp routine)
	82	!! - finalize the run by closing files and communications
	83	!!
	84	!! References : Madec, Delecluse, Imbard, and Levy, 1997: internal report, IPSL.
	85	!! Madec, 2008, internal report, IPSL.
	86	!!----------------------------------------------------------------------
	87	INTEGER :: istp ! time step index
	88	!!----------------------------------------------------------------------
	89	!
	90	#if defined key_agrif
	91	CALL Agrif_Init_Grids() ! AGRIF: set the meshes
	92	#endif
	93
	94	! !-----------------------!
	95	CALL nemo_init !== Initialisations ==!
	96	! !-----------------------!
	97	#if defined key_agrif
	98	CALL Agrif_Declare_Var ! AGRIF: set the meshes
	99	#endif
	100	! check that all process are still there... If some process have an error,
	101	! they will never enter in step and other processes will wait until the end of the cpu time!
	102	IF( lk_mpp ) CALL mpp_max( nstop )
	103
	104	IF(lwp) WRITE(numout,cform_aaa) ! Flag AAAAAAA
	105
	106	! !-----------------------!
	107	! !== time stepping ==!
	108	! !-----------------------!
	109	istp = nit000
	110
[3331]	111	DO WHILE ( istp <= nitend .AND. nstop == 0 )
[3324]	112	#if defined key_agrif
[3331]	113	CALL Agrif_Step( stp ) ! AGRIF: time stepping
[3324]	114	#else
[3331]	115	CALL stp( istp ) ! standard time stepping
[3324]	116	#endif
[3331]	117	istp = istp + 1
	118	IF( lk_mpp ) CALL mpp_max( nstop )
	119	END DO
[3324]	120	! !------------------------!
	121	! !== finalize the run ==!
	122	! !------------------------!
	123	IF(lwp) WRITE(numout,cform_aaa) ! Flag AAAAAAA
	124	!
	125	IF( nstop /= 0 .AND. lwp ) THEN ! error print
	126	WRITE(numout,cform_err)
	127	WRITE(numout,*) nstop, ' error have been found'
	128	ENDIF
	129	!
	130	#if defined key_agrif
	131	CALL Agrif_ParentGrid_To_ChildGrid()
	132	IF( nn_timing == 1 ) CALL timing_finalize
	133	CALL Agrif_ChildGrid_To_ParentGrid()
	134	#endif
	135	IF( nn_timing == 1 ) CALL timing_finalize
	136	!
	137	CALL nemo_closefile
[3769]	138	#if defined key_iomput
	139	CALL xios_finalize ! end mpp communications with xios
	140	#else
[3324]	141	IF( lk_mpp ) CALL mppstop ! end mpp communications
[3769]	142	#endif
[3324]	143	!
	144	END SUBROUTINE nemo_gcm
	145
	146
	147	SUBROUTINE nemo_init
	148	!!----------------------------------------------------------------------
	149	!! * ROUTINE nemo_init *
	150	!!
	151	!! ** Purpose : initialization of the NEMO GCM
	152	!!----------------------------------------------------------------------
	153	INTEGER :: ji ! dummy loop indices
[4147]	154	INTEGER :: ilocal_comm ! local integer
	155	INTEGER :: ios
	156
[3324]	157	CHARACTER(len=80), DIMENSION(16) :: cltxt
	158	!!
	159	NAMELIST/namctl/ ln_ctl , nn_print, nn_ictls, nn_ictle, &
	160	& nn_isplt, nn_jsplt, nn_jctls, nn_jctle, &
	161	& nn_bench, nn_timing
[4147]	162	NAMELIST/namcfg/ cp_cfg, cp_cfz, jp_cfg, jpidta, jpjdta, jpkdta, jpiglo, jpjglo, &
	163	& jpizoom, jpjzoom, jperio
[3324]	164	!!----------------------------------------------------------------------
[4290]	165	cltxt = ''
[3324]	166	!
[4147]	167	! ! Open reference namelist and configuration namelist files
	168	CALL ctl_opn( numnam_ref, 'namelist_ref', 'OLD', 'FORMATTED', 'SEQUENTIAL', -1, 6, .FALSE. )
	169	CALL ctl_opn( numnam_cfg, 'namelist_cfg', 'OLD', 'FORMATTED', 'SEQUENTIAL', -1, 6, .FALSE. )
[4290]	170	CALL ctl_opn( numond, 'output.namelist.dyn', 'REPLACE', 'FORMATTED', 'SEQUENTIAL', -1, 6, .FALSE. , 1 )
[3324]	171	!
[4147]	172	REWIND( numnam_ref ) ! Namelist namctl in reference namelist : Control prints & Benchmark
	173	READ ( numnam_ref, namctl, IOSTAT = ios, ERR = 901 )
[4290]	174	901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namctl in reference namelist', .TRUE. )
[4147]	175
	176	REWIND( numnam_cfg ) ! Namelist namctl in confguration namelist : Control prints & Benchmark
	177	READ ( numnam_cfg, namctl, IOSTAT = ios, ERR = 902 )
[4290]	178	902 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namctl in configuration namelist', .TRUE. )
[4147]	179	WRITE( numond, namctl )
[4290]	180
[3324]	181	!
[4147]	182	REWIND( numnam_ref ) ! Namelist namcfg in reference namelist : Control prints & Benchmark
	183	READ ( numnam_ref, namcfg, IOSTAT = ios, ERR = 903 )
[4290]	184	903 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namcfg in reference namelist', .TRUE. )
[4147]	185
	186	REWIND( numnam_cfg ) ! Namelist namcfg in confguration namelist : Control prints & Benchmark
	187	READ ( numnam_cfg, namcfg, IOSTAT = ios, ERR = 904 )
[4290]	188	904 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namcfg in configuration namelist', .TRUE. )
[4147]	189	WRITE( numond, namcfg )
[4290]	190
[3324]	191	! !--------------------------------------------!
	192	! ! set communicator & select the local node !
	193	! !--------------------------------------------!
	194	#if defined key_iomput
	195	IF( Agrif_Root() ) THEN
[3769]	196	CALL xios_initialize( "nemo",return_comm=ilocal_comm )
[3324]	197	ENDIF
[4147]	198	narea = mynode ( cltxt, numnam_ref, numnam_cfg, numond , nstop, ilocal_comm ) ! Nodes selection
[3324]	199	#else
	200	ilocal_comm = 0
[4147]	201	narea = mynode( cltxt, numnam_ref, numnam_cfg, numond , nstop, ilocal_comm ) ! Nodes selection (control print return in cltxt)
[3324]	202	#endif
	203	narea = narea + 1 ! mynode return the rank of proc (0 --> jpnij -1 )
	204
	205	lwp = (narea == 1) .OR. ln_ctl ! control of all listing output print
	206
	207	! If dimensions of processor grid weren't specified in the namelist file
	208	! then we calculate them here now that we have our communicator size
	209	IF( (jpni < 1) .OR. (jpnj < 1) )THEN
	210	#if defined key_mpp_mpi
	211	IF( Agrif_Root() ) CALL nemo_partition(mppsize)
	212	#else
	213	jpni = 1
	214	jpnj = 1
	215	jpnij = jpni*jpnj
	216	#endif
	217	END IF
	218
	219	! Calculate domain dimensions given calculated jpni and jpnj
	220	! This used to be done in par_oce.F90 when they were parameters rather
	221	! than variables
	222	IF( Agrif_Root() ) THEN
	223	jpi = ( jpiglo-2jpreci + (jpni-1) ) / jpni + 2jpreci ! first dim.
	224	#if defined key_nemocice_decomp
	225	jpj = ( jpjglo+1-2jprecj + (jpnj-1) ) / jpnj + 2jprecj ! second dim.
	226	#else
	227	jpj = ( jpjglo-2jprecj + (jpnj-1) ) / jpnj + 2jprecj ! second dim.
	228	#endif
	229	jpk = jpkdta ! third dim
	230	jpim1 = jpi-1 ! inner domain indices
	231	jpjm1 = jpj-1 ! " "
	232	jpkm1 = jpk-1 ! " "
	233	jpij = jpi*jpj ! jpi x j
	234	ENDIF
	235
	236	IF(lwp) THEN ! open listing units
	237	!
	238	CALL ctl_opn( numout, 'ocean.output', 'REPLACE', 'FORMATTED', 'SEQUENTIAL', -1, 6, .FALSE., narea )
	239	!
	240	WRITE(numout,*)
	241	WRITE(numout,*) ' CNRS - NERC - Met OFFICE - MERCATOR-ocean - INGV - CMCC'
	242	WRITE(numout,*) ' NEMO team'
	243	WRITE(numout,*) ' Ocean General Circulation Model'
	244	WRITE(numout,*) ' version 3.4 (2011) '
[3331]	245	WRITE(numout,*) ' StandAlone Surface version (SAS) '
[3324]	246	WRITE(numout,*)
	247	WRITE(numout,*)
	248	DO ji = 1, SIZE(cltxt)
	249	IF( TRIM(cltxt(ji)) /= '' ) WRITE(numout,*) cltxt(ji) ! control print of mynode
	250	END DO
	251	WRITE(numout,cform_aaa) ! Flag AAAAAAA
	252	!
	253	ENDIF
	254
	255	! Now we know the dimensions of the grid and numout has been set we can
	256	! allocate arrays
	257	CALL nemo_alloc()
	258
	259	! !-------------------------------!
	260	! ! NEMO general initialization !
	261	! !-------------------------------!
	262
	263	CALL nemo_ctl ! Control prints & Benchmark
	264
	265	! ! Domain decomposition
	266	IF( jpni*jpnj == jpnij ) THEN ; CALL mpp_init ! standard cutting out
	267	ELSE ; CALL mpp_init2 ! eliminate land processors
	268	ENDIF
	269	!
	270	IF( nn_timing == 1 ) CALL timing_init
	271	!
[3331]	272	! ! General initialization
	273	CALL phy_cst ! Physical constants
	274	CALL eos_init ! Equation of state
	275	CALL dom_cfg ! Domain configuration
	276	CALL dom_init ! Domain
[3324]	277
	278	IF( ln_nnogather ) CALL nemo_northcomms ! Initialise the northfold neighbour lists (must be done after the masks are defined)
	279
	280	IF( ln_ctl ) CALL prt_ctl_init ! Print control
	281	CALL flush(numout)
	282
[3331]	283	CALL day_init ! model calendar (using both namelist and restart infos)
[3324]	284
[3331]	285	CALL sbc_init ! Forcings : surface module
[3324]	286
	287	IF(lwp) WRITE(numout,*) 'Euler time step switch is ', neuler
	288	!
	289	END SUBROUTINE nemo_init
	290
	291
	292	SUBROUTINE nemo_ctl
	293	!!----------------------------------------------------------------------
	294	!! * ROUTINE nemo_ctl *
	295	!!
	296	!! ** Purpose : control print setting
	297	!!
	298	!! ** Method : - print namctl information and check some consistencies
	299	!!----------------------------------------------------------------------
	300	!
	301	IF(lwp) THEN ! control print
	302	WRITE(numout,*)
	303	WRITE(numout,*) 'nemo_ctl: Control prints & Benchmark'
	304	WRITE(numout,*) '~~~~~~~ '
	305	WRITE(numout,*) ' Namelist namctl'
	306	WRITE(numout,*) ' run control (for debugging) ln_ctl = ', ln_ctl
	307	WRITE(numout,*) ' level of print nn_print = ', nn_print
	308	WRITE(numout,*) ' Start i indice for SUM control nn_ictls = ', nn_ictls
	309	WRITE(numout,*) ' End i indice for SUM control nn_ictle = ', nn_ictle
	310	WRITE(numout,*) ' Start j indice for SUM control nn_jctls = ', nn_jctls
	311	WRITE(numout,*) ' End j indice for SUM control nn_jctle = ', nn_jctle
	312	WRITE(numout,*) ' number of proc. following i nn_isplt = ', nn_isplt
	313	WRITE(numout,*) ' number of proc. following j nn_jsplt = ', nn_jsplt
	314	WRITE(numout,*) ' benchmark parameter (0/1) nn_bench = ', nn_bench
	315	ENDIF
	316	!
	317	nprint = nn_print ! convert DOCTOR namelist names into OLD names
	318	nictls = nn_ictls
	319	nictle = nn_ictle
	320	njctls = nn_jctls
	321	njctle = nn_jctle
	322	isplt = nn_isplt
	323	jsplt = nn_jsplt
	324	nbench = nn_bench
[4147]	325
	326	IF(lwp) THEN ! control print
	327	WRITE(numout,*)
	328	WRITE(numout,*) 'namcfg : configuration initialization through namelist read'
	329	WRITE(numout,*) '~~~~~~~ '
	330	WRITE(numout,*) ' Namelist namcfg'
	331	WRITE(numout,*) ' configuration name cp_cfg = ', TRIM(cp_cfg)
	332	WRITE(numout,*) ' configuration zoom name cp_cfz = ', TRIM(cp_cfz)
	333	WRITE(numout,*) ' configuration resolution jp_cfg = ', jp_cfg
	334	WRITE(numout,*) ' 1st lateral dimension ( >= jpi ) jpidta = ', jpidta
	335	WRITE(numout,*) ' 2nd " " ( >= jpj ) jpjdta = ', jpjdta
	336	WRITE(numout,*) ' 3nd " " jpkdta = ', jpkdta
	337	WRITE(numout,*) ' 1st dimension of global domain in i jpiglo = ', jpiglo
	338	WRITE(numout,*) ' 2nd - - in j jpjglo = ', jpjglo
	339	WRITE(numout,*) ' left bottom i index of the zoom (in data domain) jpizoom = ', jpizoom
	340	WRITE(numout,*) ' left bottom j index of the zoom (in data domain) jpizoom = ', jpjzoom
	341	WRITE(numout,*) ' lateral cond. type (between 0 and 6) jperio = ', jperio
	342	ENDIF
[3324]	343	! ! Parameter control
	344	!
	345	IF( ln_ctl ) THEN ! sub-domain area indices for the control prints
	346	IF( lk_mpp .AND. jpnij > 1 ) THEN
	347	isplt = jpni ; jsplt = jpnj ; ijsplt = jpni*jpnj ! the domain is forced to the real split domain
	348	ELSE
	349	IF( isplt == 1 .AND. jsplt == 1 ) THEN
	350	CALL ctl_warn( ' - isplt & jsplt are equal to 1', &
	351	& ' - the print control will be done over the whole domain' )
	352	ENDIF
	353	ijsplt = isplt * jsplt ! total number of processors ijsplt
	354	ENDIF
	355	IF(lwp) WRITE(numout,*)' - The total number of processors over which the'
	356	IF(lwp) WRITE(numout,*)' print control will be done is ijsplt : ', ijsplt
	357	!
	358	! ! indices used for the SUM control
	359	IF( nictls+nictle+njctls+njctle == 0 ) THEN ! print control done over the default area
	360	lsp_area = .FALSE.
	361	ELSE ! print control done over a specific area
	362	lsp_area = .TRUE.
	363	IF( nictls < 1 .OR. nictls > jpiglo ) THEN
	364	CALL ctl_warn( ' - nictls must be 1<=nictls>=jpiglo, it is forced to 1' )
	365	nictls = 1
	366	ENDIF
	367	IF( nictle < 1 .OR. nictle > jpiglo ) THEN
	368	CALL ctl_warn( ' - nictle must be 1<=nictle>=jpiglo, it is forced to jpiglo' )
	369	nictle = jpiglo
	370	ENDIF
	371	IF( njctls < 1 .OR. njctls > jpjglo ) THEN
	372	CALL ctl_warn( ' - njctls must be 1<=njctls>=jpjglo, it is forced to 1' )
	373	njctls = 1
	374	ENDIF
	375	IF( njctle < 1 .OR. njctle > jpjglo ) THEN
	376	CALL ctl_warn( ' - njctle must be 1<=njctle>=jpjglo, it is forced to jpjglo' )
	377	njctle = jpjglo
	378	ENDIF
	379	ENDIF
	380	ENDIF
	381	!
	382	IF( nbench == 1 ) THEN ! Benchmark
	383	SELECT CASE ( cp_cfg )
	384	CASE ( 'gyre' ) ; CALL ctl_warn( ' The Benchmark is activated ' )
	385	CASE DEFAULT ; CALL ctl_stop( ' The Benchmark is based on the GYRE configuration:', &
[4147]	386	& ' cp_cfg="gyre" in namelist &namcfg or set nbench = 0' )
[3324]	387	END SELECT
	388	ENDIF
	389	!
	390	END SUBROUTINE nemo_ctl
	391
	392
	393	SUBROUTINE nemo_closefile
	394	!!----------------------------------------------------------------------
	395	!! * ROUTINE nemo_closefile *
	396	!!
	397	!! ** Purpose : Close the files
	398	!!----------------------------------------------------------------------
	399	!
	400	IF( lk_mpp ) CALL mppsync
	401	!
	402	CALL iom_close ! close all input/output files managed by iom_*
	403	!
[4147]	404	IF( numstp /= -1 ) CLOSE( numstp ) ! time-step file
	405	IF( numnam_ref /= -1 ) CLOSE( numnam_ref ) ! oce reference namelist
	406	IF( numnam_cfg /= -1 ) CLOSE( numnam_cfg ) ! oce configuration namelist
	407	IF( numond /= -1 ) CLOSE( numond ) ! oce output namelist
	408	IF( numnam_ice_ref /= -1 ) CLOSE( numnam_ice_ref ) ! ice reference namelist
	409	IF( numnam_ice_cfg /= -1 ) CLOSE( numnam_ice_cfg ) ! ice configuration namelist
	410	IF( numoni /= -1 ) CLOSE( numoni ) ! ice output namelist
	411	IF( numevo_ice /= -1 ) CLOSE( numevo_ice ) ! ice variables (temp. evolution)
	412	IF( numout /= 6 ) CLOSE( numout ) ! standard model output file
[3324]	413	!
	414	numout = 6 ! redefine numout in case it is used after this point...
	415	!
	416	END SUBROUTINE nemo_closefile
	417
	418
	419	SUBROUTINE nemo_alloc
	420	!!----------------------------------------------------------------------
	421	!! * ROUTINE nemo_alloc *
	422	!!
	423	!! ** Purpose : Allocate all the dynamic arrays of the OPA modules
	424	!!
	425	!! ** Method :
	426	!!----------------------------------------------------------------------
	427	USE diawri , ONLY: dia_wri_alloc
	428	USE dom_oce , ONLY: dom_oce_alloc
[4147]	429	USE oce , ONLY : sshn, sshb, snwice_mass, snwice_mass_b, snwice_fmass
[3324]	430	!
[4147]	431	INTEGER :: ierr,ierr4
[3324]	432	!!----------------------------------------------------------------------
	433	!
[3335]	434	ierr = dia_wri_alloc ()
[3324]	435	ierr = ierr + dom_oce_alloc () ! ocean domain
[4147]	436	ALLOCATE( snwice_mass(jpi,jpj) , snwice_mass_b(jpi,jpj), &
	437	& snwice_fmass(jpi,jpj), STAT= ierr4 )
	438	ierr = ierr + ierr4
[3324]	439	!
	440	IF( lk_mpp ) CALL mpp_sum( ierr )
	441	IF( ierr /= 0 ) CALL ctl_stop( 'STOP', 'nemo_alloc : unable to allocate standard ocean arrays' )
	442	!
	443	END SUBROUTINE nemo_alloc
	444
	445
	446	SUBROUTINE nemo_partition( num_pes )
	447	!!----------------------------------------------------------------------
	448	!! * ROUTINE nemo_partition *
	449	!!
	450	!! ** Purpose :
	451	!!
	452	!! ** Method :
	453	!!----------------------------------------------------------------------
	454	INTEGER, INTENT(in) :: num_pes ! The number of MPI processes we have
	455	!
	456	INTEGER, PARAMETER :: nfactmax = 20
	457	INTEGER :: nfact ! The no. of factors returned
	458	INTEGER :: ierr ! Error flag
	459	INTEGER :: ji
	460	INTEGER :: idiff, mindiff, imin ! For choosing pair of factors that are closest in value
	461	INTEGER, DIMENSION(nfactmax) :: ifact ! Array of factors
	462	!!----------------------------------------------------------------------
	463
	464	ierr = 0
	465
	466	CALL factorise( ifact, nfactmax, nfact, num_pes, ierr )
	467
	468	IF( nfact <= 1 ) THEN
	469	WRITE (numout, *) 'WARNING: factorisation of number of PEs failed'
	470	WRITE (numout, *) ' : using grid of ',num_pes,' x 1'
	471	jpnj = 1
	472	jpni = num_pes
	473	ELSE
	474	! Search through factors for the pair that are closest in value
	475	mindiff = 1000000
	476	imin = 1
	477	DO ji = 1, nfact-1, 2
	478	idiff = ABS( ifact(ji) - ifact(ji+1) )
	479	IF( idiff < mindiff ) THEN
	480	mindiff = idiff
	481	imin = ji
	482	ENDIF
	483	END DO
	484	jpnj = ifact(imin)
	485	jpni = ifact(imin + 1)
	486	ENDIF
	487	!
	488	jpnij = jpni*jpnj
	489	!
	490	END SUBROUTINE nemo_partition
	491
	492
	493	SUBROUTINE factorise( kfax, kmaxfax, knfax, kn, kerr )
	494	!!----------------------------------------------------------------------
	495	!! * ROUTINE factorise *
	496	!!
	497	!! ** Purpose : return the prime factors of n.
	498	!! knfax factors are returned in array kfax which is of
	499	!! maximum dimension kmaxfax.
	500	!! ** Method :
	501	!!----------------------------------------------------------------------
	502	INTEGER , INTENT(in ) :: kn, kmaxfax
	503	INTEGER , INTENT( out) :: kerr, knfax
	504	INTEGER, DIMENSION(kmaxfax), INTENT( out) :: kfax
	505	!
	506	INTEGER :: ifac, jl, inu
	507	INTEGER, PARAMETER :: ntest = 14
	508	INTEGER :: ilfax(ntest)
	509
	510	! lfax contains the set of allowed factors.
	511	data (ilfax(jl),jl=1,ntest) / 16384, 8192, 4096, 2048, 1024, 512, 256, &
	512	& 128, 64, 32, 16, 8, 4, 2 /
	513	!!----------------------------------------------------------------------
	514
	515	! Clear the error flag and initialise output vars
	516	kerr = 0
	517	kfax = 1
	518	knfax = 0
	519
	520	! Find the factors of n.
	521	IF( kn == 1 ) GOTO 20
	522
	523	! nu holds the unfactorised part of the number.
	524	! knfax holds the number of factors found.
	525	! l points to the allowed factor list.
	526	! ifac holds the current factor.
	527
	528	inu = kn
	529	knfax = 0
	530
	531	DO jl = ntest, 1, -1
	532	!
	533	ifac = ilfax(jl)
	534	IF( ifac > inu ) CYCLE
	535
	536	! Test whether the factor will divide.
	537
	538	IF( MOD(inu,ifac) == 0 ) THEN
	539	!
	540	knfax = knfax + 1 ! Add the factor to the list
	541	IF( knfax > kmaxfax ) THEN
	542	kerr = 6
	543	write (,) 'FACTOR: insufficient space in factor array ', knfax
	544	return
	545	ENDIF
	546	kfax(knfax) = ifac
	547	! Store the other factor that goes with this one
	548	knfax = knfax + 1
	549	kfax(knfax) = inu / ifac
	550	!WRITE (,) 'ARPDBG, factors ',knfax-1,' & ',knfax,' are ', kfax(knfax-1),' and ',kfax(knfax)
	551	ENDIF
	552	!
	553	END DO
	554
	555	20 CONTINUE ! Label 20 is the exit point from the factor search loop.
	556	!
	557	END SUBROUTINE factorise
	558
	559	#if defined key_mpp_mpi
	560	SUBROUTINE nemo_northcomms
	561	!!======================================================================
	562	!! * ROUTINE nemo_northcomms *
[4232]	563	!! nemo_northcomms : Setup for north fold exchanges with explicit
	564	!! point-to-point messaging
[3324]	565	!!=====================================================================
	566	!!----------------------------------------------------------------------
[4232]	567	!!
[3324]	568	!! ** Purpose : Initialization of the northern neighbours lists.
	569	!!----------------------------------------------------------------------
[4232]	570	!! 1.0 ! 2011-10 (A. C. Coward, NOCS & J. Donners, PRACE)
	571	!! 2.0 ! 2013-06 Setup avoiding MPI communication (I. Epicoco, S. Mocavero, CMCC)
[3324]	572	!!----------------------------------------------------------------------
	573
[4232]	574	INTEGER :: sxM, dxM, sxT, dxT, jn
	575	INTEGER :: njmppmax
[3324]	576
[4232]	577	njmppmax = MAXVAL( njmppt )
	578
	579	!initializes the north-fold communication variables
	580	isendto(:) = 0
[3324]	581	nsndto = 0
	582
[4232]	583	!if I am a process in the north
	584	IF ( njmpp == njmppmax ) THEN
	585	!sxM is the first point (in the global domain) needed to compute the
	586	!north-fold for the current process
	587	sxM = jpiglo - nimppt(narea) - nlcit(narea) + 1
	588	!dxM is the last point (in the global domain) needed to compute the
	589	!north-fold for the current process
	590	dxM = jpiglo - nimppt(narea) + 2
[3324]	591
[4232]	592	!loop over the other north-fold processes to find the processes
	593	!managing the points belonging to the sxT-dxT range
	594	DO jn = jpnij - jpni +1, jpnij
	595	IF ( njmppt(jn) == njmppmax ) THEN
	596	!sxT is the first point (in the global domain) of the jn
	597	!process
	598	sxT = nimppt(jn)
	599	!dxT is the last point (in the global domain) of the jn
	600	!process
	601	dxT = nimppt(jn) + nlcit(jn) - 1
	602	IF ((sxM .gt. sxT) .AND. (sxM .lt. dxT)) THEN
	603	nsndto = nsndto + 1
	604	isendto(nsndto) = jn
	605	ELSEIF ((sxM .le. sxT) .AND. (dxM .gt. dxT)) THEN
	606	nsndto = nsndto + 1
	607	isendto(nsndto) = jn
	608	ELSEIF ((dxM .lt. dxT) .AND. (sxT .lt. dxM)) THEN
	609	nsndto = nsndto + 1
	610	isendto(nsndto) = jn
	611	END IF
	612	END IF
	613	END DO
[3324]	614	ENDIF
[4232]	615	l_north_nogather = .TRUE.
	616	END SUBROUTINE nemo_northcomms
[3324]	617
	618	#else
	619	SUBROUTINE nemo_northcomms ! Dummy routine
	620	WRITE(,) 'nemo_northcomms: You should not have seen this print! error?'
	621	END SUBROUTINE nemo_northcomms
	622	#endif
	623	!!======================================================================
	624	END MODULE nemogcm

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