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C $Header: /u/gcmpack/MITgcm/pkg/mdsio/mdsio_writefield_new.F,v 1.6 2005/11/08 15:53:41 cnh Exp $ |
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C $Name: $ |
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|
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#include "MDSIO_OPTIONS.h" |
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|
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CBOP |
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C !ROUTINE: MDS_WRITE_FIELD |
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C !INTERFACE: |
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SUBROUTINE MDS_WRITE_FIELD( |
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I fName, |
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I filePrec, |
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I globalFile, |
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I useCurrentDir, |
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I arrType, |
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I zSize,nNz, |
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I arr, |
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I jrecord, |
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I myIter, |
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I myThid ) |
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|
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C !DESCRIPTION: |
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C Arguments: |
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C |
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C fName (string) :: base name for file to write |
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C filePrec (integer) :: number of bits per word in file (32 or 64) |
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C globalFile (logical):: selects between writing a global or tiled file |
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C useCurrentDir(logic):: always write to the current directory (even if |
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C "mdsioLocalDir" is set) |
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C arrType (char(2)) :: declaration of "arr": either "RS" or "RL" |
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C zSize (integer) :: size of third dimension: normally either 1 or Nr |
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C nNz (integer) :: number of vertical levels to write |
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C arr ( RS/RL ) :: array to write, arr(:,:,zSize,:,:) |
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C irecord (integer) :: record number to write |
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C myIter (integer) :: time step number |
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C myThid (integer) :: thread identifier |
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C |
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C MDS_WRITE_FIELD creates either a file of the form "fName.data" and |
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C "fName.meta" if the logical flag "globalFile" is set true. Otherwise |
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C it creates MDS tiled files of the form "fName.xxx.yyy.data" and |
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C "fName.xxx.yyy.meta". If jrecord > 0, a meta-file is created. |
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C Currently, the meta-files are not read because it is difficult |
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C to parse files in fortran. We should read meta information before |
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C adding records to an existing multi-record file. |
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C The precision of the file is decsribed by filePrec, set either |
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C to floatPrec32 or floatPrec64. The precision or declaration of |
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C the array argument must be consistently described by the char*(2) |
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C string arrType, either "RS" or "RL". nNz allows for both 2-D and |
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C 3-D arrays to be handled. nNz=1 implies a 2-D model field and |
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C nNz=Nr implies a 3-D model field. irecord=|jrecord| is the record number |
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C to be written and must be >= 1. NOTE: It is currently assumed that |
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C the highest record number in the file was the last record written. |
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C Nor is there a consistency check between the routine arguments and file. |
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C ie. If your write record 2 after record 4 the meta information |
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C will record the number of records to be 2. This, again, is because |
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C we have read the meta information. To be fixed. |
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C |
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C Created: 03/16/99 adcroft@mit.edu |
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C Changed: 01/06/02 menemenlis@jpl.nasa.gov |
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C added useSingleCpuIO hack |
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C changed: 1/23/04 afe@ocean.mit.edu |
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C added exch2 handling -- yes, the globalfile logic is nuts |
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CEOP |
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|
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C !USES: |
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IMPLICIT NONE |
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C Global variables / common blocks |
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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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#include "PARAMS.h" |
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#ifdef ALLOW_EXCH2 |
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#include "W2_EXCH2_TOPOLOGY.h" |
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#include "W2_EXCH2_PARAMS.h" |
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#endif /* ALLOW_EXCH2 */ |
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#include "MDSIO_SCPU.h" |
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|
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C !INPUT PARAMETERS: |
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CHARACTER*(*) fName |
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INTEGER filePrec |
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LOGICAL globalFile |
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LOGICAL useCurrentDir |
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CHARACTER*(2) arrType |
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INTEGER zSize, nNz |
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cph( |
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cph Real arr(*) |
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_RL arr(1-oLx:sNx+oLx,1-oLy:sNy+oLy,zSize,nSx,nSy) |
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cph) |
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INTEGER jrecord |
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INTEGER myIter |
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INTEGER myThid |
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C !OUTPUT PARAMETERS: |
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|
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C !FUNCTIONS |
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INTEGER ILNBLNK |
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INTEGER MDS_RECLEN |
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LOGICAL MASTER_CPU_IO |
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EXTERNAL ILNBLNK |
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EXTERNAL MDS_RECLEN |
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EXTERNAL MASTER_CPU_IO |
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|
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C !LOCAL VARIABLES: |
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CHARACTER*(MAX_LEN_FNAM) dataFName,metaFName,pfName |
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CHARACTER*(MAX_LEN_MBUF) msgBuf |
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LOGICAL fileIsOpen |
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LOGICAL iAmDoingIO |
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LOGICAL writeMetaF |
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INTEGER irecord |
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INTEGER iG,jG,irec,bi,bj,i,j,k,dUnit,IL,pIL |
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INTEGER dimList(3,3),nDims |
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INTEGER x_size,y_size,length_of_rec |
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#if defined(ALLOW_EXCH2) && !defined(MISSING_TILE_IO) |
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INTEGER iG_IO,jG_IO,npe |
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PARAMETER ( x_size = exch2_domain_nxt * sNx ) |
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PARAMETER ( y_size = exch2_domain_nyt * sNy ) |
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#else |
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PARAMETER ( x_size = Nx ) |
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PARAMETER ( y_size = Ny ) |
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#endif |
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Real*4 r4seg(sNx) |
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Real*8 r8seg(sNx) |
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Real*4 xy_buffer_r4(x_size,y_size) |
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Real*8 xy_buffer_r8(x_size,y_size) |
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Real*8 globalBuf(Nx,Ny) |
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#ifdef ALLOW_EXCH2 |
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c INTEGER tGy,tGx,tNy,tNx,tn |
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INTEGER tGy,tGx, tNx,tn |
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#endif /* ALLOW_EXCH2 */ |
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INTEGER tNy |
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|
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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|
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C Assume nothing |
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fileIsOpen = .FALSE. |
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IL = ILNBLNK( fName ) |
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pIL = ILNBLNK( mdsioLocalDir ) |
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irecord = ABS(jrecord) |
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writeMetaF = jrecord.GT.0 |
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|
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C Only do I/O if I am the master thread (and mpi process 0 IF useSingleCpuIO): |
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iAmDoingIO = MASTER_CPU_IO(myThid) |
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|
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C Only do I/O if I am the master thread |
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IF ( iAmDoingIO ) THEN |
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|
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C Record number must be >= 1 |
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IF (irecord .LT. 1) THEN |
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WRITE(msgBuf,'(A,I9.8)') |
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& ' MDS_WRITE_FIELD: argument irecord = ',irecord |
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CALL PRINT_MESSAGE( msgBuf, standardMessageUnit, |
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& SQUEEZE_RIGHT , myThid) |
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WRITE(msgBuf,'(A)') |
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& ' MDS_WRITE_FIELD: invalid value for irecord' |
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CALL PRINT_ERROR( msgBuf, myThid ) |
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STOP 'ABNORMAL END: S/R MDS_WRITE_FIELD' |
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ENDIF |
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|
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C Assign special directory |
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IF ( useCurrentDir .OR. pIL.EQ.0 ) THEN |
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pfName = fName |
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ELSE |
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WRITE(pfName,'(2A)') mdsioLocalDir(1:pIL), fName(1:IL) |
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ENDIF |
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pIL=ILNBLNK( pfName ) |
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|
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C Assign a free unit number as the I/O channel for this routine |
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CALL MDSFINDUNIT( dUnit, myThid ) |
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|
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C- endif iAmDoingIO |
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ENDIF |
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|
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C If option globalFile is desired but does not work or if |
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C globalFile is too slow, then try using single-CPU I/O. |
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IF (useSingleCpuIO) THEN |
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|
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C Master thread of process 0, only, opens a global file |
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IF ( iAmDoingIO ) THEN |
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WRITE(dataFName,'(2a)') fName(1:IL),'.data' |
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length_of_rec=MDS_RECLEN(filePrec,x_size*y_size,myThid) |
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IF (irecord .EQ. 1) THEN |
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OPEN( dUnit, file=dataFName, status=_NEW_STATUS, |
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& access='direct', recl=length_of_rec ) |
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ELSE |
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OPEN( dUnit, file=dataFName, status=_OLD_STATUS, |
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& access='direct', recl=length_of_rec ) |
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ENDIF |
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ENDIF |
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|
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C Gather array and WRITE it to file, one vertical level at a time |
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DO k=1,nNz |
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C- copy from arr(level=k) to 2-D "local": |
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IF ( arrType.EQ.'RS' ) THEN |
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CALL MDS_PASStoRS(sharedLocalBuf,arr,k,zSize,.FALSE.,myThid) |
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ELSEIF ( arrType.EQ.'RL' ) THEN |
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CALL MDS_PASStoRL(sharedLocalBuf,arr,k,zSize,.FALSE.,myThid) |
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ELSE |
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WRITE(msgBuf,'(A)') |
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& ' MDS_WRITE_FIELD: illegal value for arrType' |
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CALL PRINT_ERROR( msgBuf, myThid ) |
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STOP 'ABNORMAL END: S/R MDS_WRITE_FIELD' |
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ENDIF |
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CALL GATHER_2D( globalBuf, sharedLocalBuf, myThid ) |
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|
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IF ( iAmDoingIO ) THEN |
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irec=k+nNz*(irecord-1) |
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IF (filePrec .EQ. precFloat32) THEN |
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#if defined(ALLOW_EXCH2) && !defined(MISSING_TILE_IO) |
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DO J=1,y_size |
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DO I=1,x_size |
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xy_buffer_r4(I,J) = 0.0 |
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ENDDO |
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ENDDO |
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bj=1 |
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DO npe=1,nPx*nPy |
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DO bi=1,nSx |
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DO J=1,sNy |
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DO I=1,sNx |
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#ifdef ALLOW_USE_MPI |
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iG=mpi_myXGlobalLo(npe)-1+(bi-1)*sNx+i |
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jG=mpi_myYGlobalLo(npe)-1+(bj-1)*sNy+j |
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#else |
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iG= myXGlobalLo-1+(bi-1)*sNx+i |
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jG= myYGlobalLo-1+(bj-1)*sNy+j |
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#endif /* ALLOW_USE_MPI */ |
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iG_IO=exch2_txGlobalo(W2_mpi_myTileList(npe,bi))+i-1 |
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jG_IO=exch2_tyGlobalo(W2_mpi_myTileList(npe,bi))+j-1 |
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xy_buffer_r4(iG_IO,jG_IO) = globalBuf(iG,jG) |
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ENDDO |
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ENDDO |
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ENDDO |
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ENDDO |
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#else /* defined(ALLOW_EXCH2) && !defined(MISSING_TILE_IO) */ |
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DO J=1,Ny |
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DO I=1,Nx |
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xy_buffer_r4(I,J) = globalBuf(I,J) |
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ENDDO |
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ENDDO |
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#endif /* defined(ALLOW_EXCH2) && !defined(MISSING_TILE_IO) */ |
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#ifdef _BYTESWAPIO |
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CALL MDS_BYTESWAPR4( x_size*y_size, xy_buffer_r4 ) |
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#endif |
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WRITE(dUnit,rec=irec) xy_buffer_r4 |
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ELSEIF (filePrec .EQ. precFloat64) THEN |
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#if defined(ALLOW_EXCH2) && !defined(MISSING_TILE_IO) |
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DO J=1,y_size |
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DO I=1,x_size |
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xy_buffer_r8(I,J) = 0.0 |
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ENDDO |
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ENDDO |
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bj=1 |
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DO npe=1,nPx*nPy |
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DO bi=1,nSx |
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DO J=1,sNy |
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DO I=1,sNx |
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#ifdef ALLOW_USE_MPI |
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iG=mpi_myXGlobalLo(npe)-1+(bi-1)*sNx+i |
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jG=mpi_myYGlobalLo(npe)-1+(bj-1)*sNy+j |
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#else |
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iG= myXGlobalLo-1+(bi-1)*sNx+i |
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jG= myYGlobalLo-1+(bj-1)*sNy+j |
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#endif /* ALLOW_USE_MPI */ |
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iG_IO=exch2_txGlobalo(W2_mpi_myTileList(npe,bi))+i-1 |
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jG_IO=exch2_tyGlobalo(W2_mpi_myTileList(npe,bi))+j-1 |
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xy_buffer_r8(iG_IO,jG_IO) = globalBuf(iG,jG) |
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ENDDO |
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ENDDO |
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ENDDO |
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ENDDO |
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#else /* defined(ALLOW_EXCH2) && !defined(MISSING_TILE_IO) */ |
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DO J=1,Ny |
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DO I=1,Nx |
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xy_buffer_r8(I,J) = globalBuf(I,J) |
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ENDDO |
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ENDDO |
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#endif /* defined(ALLOW_EXCH2) && !defined(MISSING_TILE_IO) */ |
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#ifdef _BYTESWAPIO |
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CALL MDS_BYTESWAPR8( x_size*y_size, xy_buffer_r8 ) |
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#endif |
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WRITE(dUnit,rec=irec) xy_buffer_r8 |
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ELSE |
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WRITE(msgBuf,'(A)') |
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& ' MDS_WRITE_FIELD: illegal value for filePrec' |
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CALL PRINT_ERROR( msgBuf, myThid ) |
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STOP 'ABNORMAL END: S/R MDS_WRITE_FIELD' |
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ENDIF |
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ENDIF |
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ENDDO |
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|
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C Close data-file |
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IF ( iAmDoingIO ) THEN |
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CLOSE( dUnit ) |
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ENDIF |
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|
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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C--- else .NOT.useSingleCpuIO |
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ELSE |
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|
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C Only do I/O if I am the master thread |
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IF ( iAmDoingIO ) THEN |
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|
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C If we are writing to a global file then we open it here |
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IF (globalFile) THEN |
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WRITE(dataFName,'(2a)') fName(1:IL),'.data' |
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IF (irecord .EQ. 1) THEN |
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length_of_rec=MDS_RECLEN( filePrec, sNx, myThid ) |
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OPEN( dUnit, file=dataFName, status=_NEW_STATUS, |
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& access='direct', recl=length_of_rec ) |
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fileIsOpen=.TRUE. |
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ELSE |
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length_of_rec=MDS_RECLEN( filePrec, sNx, myThid ) |
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OPEN( dUnit, file=dataFName, status=_OLD_STATUS, |
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& access='direct', recl=length_of_rec ) |
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fileIsOpen=.TRUE. |
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ENDIF |
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ENDIF |
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|
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C Loop over all tiles |
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DO bj=1,nSy |
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DO bi=1,nSx |
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C If we are writing to a tiled MDS file then we open each one here |
| 320 |
IF (.NOT. globalFile) THEN |
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iG=bi+(myXGlobalLo-1)/sNx ! Kludge until unstructered tiles |
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jG=bj+(myYGlobalLo-1)/sNy ! Kludge until unstructered tiles |
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WRITE(dataFName,'(2A,I3.3,A,I3.3,A)') |
| 324 |
& pfName(1:pIL),'.',iG,'.',jG,'.data' |
| 325 |
IF (irecord .EQ. 1) THEN |
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length_of_rec=MDS_RECLEN( filePrec, sNx, myThid ) |
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OPEN( dUnit, file=dataFName, status=_NEW_STATUS, |
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& access='direct', recl=length_of_rec ) |
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fileIsOpen=.TRUE. |
| 330 |
ELSE |
| 331 |
length_of_rec=MDS_RECLEN( filePrec, sNx, myThid ) |
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OPEN( dUnit, file=dataFName, status=_OLD_STATUS, |
| 333 |
& access='direct', recl=length_of_rec ) |
| 334 |
fileIsOpen=.TRUE. |
| 335 |
ENDIF |
| 336 |
ENDIF |
| 337 |
IF (fileIsOpen) THEN |
| 338 |
tNy = sNy |
| 339 |
#ifdef ALLOW_EXCH2 |
| 340 |
tn = W2_myTileList(bi) |
| 341 |
tGy = exch2_tyGlobalo(tn) |
| 342 |
tGx = exch2_txGlobalo(tn) |
| 343 |
tNy = exch2_tNy(tn) |
| 344 |
tNx = exch2_tNx(tn) |
| 345 |
#endif /* ALLOW_EXCH2 */ |
| 346 |
DO k=1,nNz |
| 347 |
DO j=1,tNy |
| 348 |
IF (globalFile) THEN |
| 349 |
#ifdef ALLOW_EXCH2 |
| 350 |
irec = 1 + (tGx-1)/tNx |
| 351 |
& + ( j-1 + tGy-1 )*exch2_domain_nxt |
| 352 |
& + ( k-1 + (irecord-1)*nNz |
| 353 |
& )*tNy*exch2_domain_nyt*exch2_domain_nxt |
| 354 |
#else /* ALLOW_EXCH2 */ |
| 355 |
iG = myXGlobalLo-1 + (bi-1)*sNx |
| 356 |
jG = myYGlobalLo-1 + (bj-1)*sNy |
| 357 |
irec= 1 + INT(iG/sNx) + nSx*nPx*(jG+j-1) |
| 358 |
& + nSx*nPx*Ny*(k-1) |
| 359 |
& + nSx*nPx*Ny*nNz*(irecord-1) |
| 360 |
#endif /* ALLOW_EXCH2 */ |
| 361 |
ELSE |
| 362 |
iG = 0 |
| 363 |
jG = 0 |
| 364 |
irec=j + sNy*(k-1) + sNy*nNz*(irecord-1) |
| 365 |
ENDIF |
| 366 |
IF (filePrec .EQ. precFloat32) THEN |
| 367 |
IF (arrType .EQ. 'RS') THEN |
| 368 |
CALL MDS_SEG4toRS( j,bi,bj,k,zSize, r4seg,.FALSE.,arr ) |
| 369 |
ELSEIF (arrType .EQ. 'RL') THEN |
| 370 |
CALL MDS_SEG4toRL( j,bi,bj,k,zSize, r4seg,.FALSE.,arr ) |
| 371 |
ELSE |
| 372 |
WRITE(msgBuf,'(A)') |
| 373 |
& ' MDS_WRITE_FIELD: illegal value for arrType' |
| 374 |
CALL PRINT_ERROR( msgBuf, myThid ) |
| 375 |
STOP 'ABNORMAL END: S/R MDS_WRITE_FIELD' |
| 376 |
ENDIF |
| 377 |
#ifdef _BYTESWAPIO |
| 378 |
CALL MDS_BYTESWAPR4( sNx, r4seg ) |
| 379 |
#endif |
| 380 |
WRITE(dUnit,rec=irec) r4seg |
| 381 |
ELSEIF (filePrec .EQ. precFloat64) THEN |
| 382 |
IF (arrType .EQ. 'RS') THEN |
| 383 |
CALL MDS_SEG8toRS( j,bi,bj,k,zSize, r8seg,.FALSE.,arr ) |
| 384 |
ELSEIF (arrType .EQ. 'RL') THEN |
| 385 |
CALL MDS_SEG8toRL( j,bi,bj,k,zSize, r8seg,.FALSE.,arr ) |
| 386 |
ELSE |
| 387 |
WRITE(msgBuf,'(A)') |
| 388 |
& ' MDS_WRITE_FIELD: illegal value for arrType' |
| 389 |
CALL PRINT_ERROR( msgBuf, myThid ) |
| 390 |
STOP 'ABNORMAL END: S/R MDS_WRITE_FIELD' |
| 391 |
ENDIF |
| 392 |
#ifdef _BYTESWAPIO |
| 393 |
CALL MDS_BYTESWAPR8( sNx, r8seg ) |
| 394 |
#endif |
| 395 |
WRITE(dUnit,rec=irec) r8seg |
| 396 |
ELSE |
| 397 |
WRITE(msgBuf,'(A)') |
| 398 |
& ' MDS_WRITE_FIELD: illegal value for filePrec' |
| 399 |
CALL PRINT_ERROR( msgBuf, myThid ) |
| 400 |
STOP 'ABNORMAL END: S/R MDS_WRITE_FIELD' |
| 401 |
ENDIF |
| 402 |
C End of j loop |
| 403 |
ENDDO |
| 404 |
C End of k loop |
| 405 |
ENDDO |
| 406 |
ELSE |
| 407 |
C fileIsOpen=F |
| 408 |
WRITE(msgBuf,'(A)') |
| 409 |
& ' MDS_WRITE_FIELD: I should never get to this point' |
| 410 |
CALL PRINT_ERROR( msgBuf, myThid ) |
| 411 |
STOP 'ABNORMAL END: S/R MDS_WRITE_FIELD' |
| 412 |
ENDIF |
| 413 |
C If we were writing to a tiled MDS file then we close it here |
| 414 |
IF (fileIsOpen .AND. (.NOT. globalFile)) THEN |
| 415 |
CLOSE( dUnit ) |
| 416 |
fileIsOpen = .FALSE. |
| 417 |
ENDIF |
| 418 |
C Create meta-file for each tile if we are tiling |
| 419 |
IF ( .NOT.globalFile .AND. writeMetaF ) THEN |
| 420 |
iG=bi+(myXGlobalLo-1)/sNx |
| 421 |
jG=bj+(myYGlobalLo-1)/sNy |
| 422 |
WRITE(metaFname,'(2A,I3.3,A,I3.3,A)') |
| 423 |
& pfName(1:pIL),'.',iG,'.',jG,'.meta' |
| 424 |
#if defined(ALLOW_EXCH2) && !defined(MISSING_TILE_IO) |
| 425 |
tn = W2_myTileList(bi) |
| 426 |
dimList(1,1)=x_size |
| 427 |
dimList(2,1)=exch2_txGlobalo(tn) |
| 428 |
dimList(3,1)=exch2_txGlobalo(tn)+sNx-1 |
| 429 |
dimList(1,2)=y_size |
| 430 |
dimList(2,2)=exch2_tyGlobalo(tn) |
| 431 |
dimList(3,2)=exch2_tyGlobalo(tn)+sNy-1 |
| 432 |
#else /* defined(ALLOW_EXCH2) && !defined(MISSING_TILE_IO) */ |
| 433 |
C- jmc: if MISSING_TILE_IO, keep meta files unchanged |
| 434 |
C to stay consistent with global file structure |
| 435 |
dimList(1,1)=Nx |
| 436 |
dimList(2,1)=myXGlobalLo+(bi-1)*sNx |
| 437 |
dimList(3,1)=myXGlobalLo+bi*sNx-1 |
| 438 |
dimList(1,2)=Ny |
| 439 |
dimList(2,2)=myYGlobalLo+(bj-1)*sNy |
| 440 |
dimList(3,2)=myYGlobalLo+bj*sNy-1 |
| 441 |
#endif /* defined(ALLOW_EXCH2) && !defined(MISSING_TILE_IO) */ |
| 442 |
dimList(1,3)=nNz |
| 443 |
dimList(2,3)=1 |
| 444 |
dimList(3,3)=nNz |
| 445 |
nDims=3 |
| 446 |
IF ( nNz.EQ.1 ) nDims=2 |
| 447 |
CALL MDS_WRITE_META( |
| 448 |
I metaFName, dataFName, the_run_name, ' ', |
| 449 |
I filePrec, nDims, dimList, 0, ' ', |
| 450 |
I 0, UNSET_RL, irecord, myIter, myThid ) |
| 451 |
ENDIF |
| 452 |
C End of bi,bj loops |
| 453 |
ENDDO |
| 454 |
ENDDO |
| 455 |
|
| 456 |
C If global file was opened then close it |
| 457 |
IF (fileIsOpen .AND. globalFile) THEN |
| 458 |
CLOSE( dUnit ) |
| 459 |
fileIsOpen = .FALSE. |
| 460 |
ENDIF |
| 461 |
|
| 462 |
C- endif iAmDoingIO |
| 463 |
ENDIF |
| 464 |
|
| 465 |
C if useSingleCpuIO / else / end |
| 466 |
ENDIF |
| 467 |
|
| 468 |
C Create meta-file for the global-file (also if useSingleCpuIO) |
| 469 |
IF ( writeMetaF .AND. iAmDoingIO .AND. |
| 470 |
& (globalFile .OR. useSingleCpuIO) ) THEN |
| 471 |
WRITE(metaFName,'(2A)') fName(1:IL),'.meta' |
| 472 |
dimList(1,1)=x_size |
| 473 |
dimList(2,1)=1 |
| 474 |
dimList(3,1)=x_size |
| 475 |
dimList(1,2)=y_size |
| 476 |
dimList(2,2)=1 |
| 477 |
dimList(3,2)=y_size |
| 478 |
dimList(1,3)=nNz |
| 479 |
dimList(2,3)=1 |
| 480 |
dimList(3,3)=nNz |
| 481 |
ndims=3 |
| 482 |
IF ( nNz.EQ.1 ) ndims=2 |
| 483 |
CALL MDS_WRITE_META( |
| 484 |
I metaFName, dataFName, the_run_name, ' ', |
| 485 |
I filePrec, nDims, dimList, 0, ' ', |
| 486 |
I 0, UNSET_RL, irecord, myIter, myThid ) |
| 487 |
c I metaFName, dataFName, the_run_name, titleLine, |
| 488 |
c I filePrec, nDims, dimList, nFlds, fldList, |
| 489 |
c I nTimRec, timList, irecord, myIter, myThid ) |
| 490 |
ENDIF |
| 491 |
|
| 492 |
C To be safe, make other processes wait for I/O completion |
| 493 |
_BARRIER |
| 494 |
|
| 495 |
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
| 496 |
RETURN |
| 497 |
END |
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