C $Header: /home/ubuntu/mnt/e9_copy/MITgcm/pkg/exch2/W2_EXCH2_SIZE.h,v 1.2 2010/10/13 20:56:00 jahn Exp $
C $Name: checkpoint62r $

CBOP
C    !ROUTINE: W2_EXCH2_SIZE.h
C    !INTERFACE:
C    include W2_EXCH2_SIZE.h
C    !DESCRIPTION: \bv
C     *==========================================================*
C     | W2_EXCH2_SIZE.h
C     | Declare size of Wrapper2-Exch2 arrays
C     *==========================================================*
C     | Expected to be modified for unconventional configuration
C     | (e.g., many blank-tiles) or specific topology.
C     *==========================================================*
CEOP

C---   Size of Tiling topology structures
C  W2_maxNbFacets   :: Maximum number of Facets (also and formerly called
C                   :: "domains" or "sub-domains") of this topology.
C  W2_maxNeighbours :: Maximum number of neighbours any tile has.
C  W2_maxNbTiles    :: Maximum number of tiles (active+blank) in this topology
C  W2_ioBufferSize  :: Maximum size of Single-CPU IO buffer.
       INTEGER W2_maxNbFacets
       INTEGER W2_maxNeighbours
       INTEGER W2_maxNbTiles
       INTEGER W2_ioBufferSize
       INTEGER W2_maxXStackNx
       INTEGER W2_maxXStackNy
       INTEGER W2_maxYStackNx
       INTEGER W2_maxYStackNy

C---   Default values :
C      (suitable for 6-face Cube-Sphere topology, compact global I/O format)
C      W2_maxNbTiles = Nb of active tiles (=nSx*nSy*nPx*nPy) + Max_Nb_BlankTiles
C      default assume a large Max_Nb_BlankTiles equal to Nb of active tiles
C      resulting in doubling the tile number.
       PARAMETER ( W2_maxNbFacets = 10 )
       PARAMETER ( W2_maxNeighbours = 8 )
       PARAMETER ( W2_maxNbTiles = nSx*nSy*nPx*nPy * 2 )
       PARAMETER ( W2_ioBufferSize = W2_maxNbTiles*sNx*sNy )
       PARAMETER ( W2_maxXStackNx = W2_maxNbTiles*sNx )
       PARAMETER ( W2_maxXStackNy = W2_maxNbTiles*sNy )
       PARAMETER ( W2_maxYStackNx = W2_maxNbTiles*sNx )
       PARAMETER ( W2_maxYStackNy = W2_maxNbTiles*sNy )

C- Note: Overestimating W2_maxNbFacets and, to less extent, W2_maxNeighbours
C        have no or very little effects on memory footprint.
C        overestimated W2_maxNbTiles does not have large effect, except
C        through ioBufferSize (if related to, as here).
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----|