/[MITgcm]/manual/s_software/text/sarch.tex
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revision 1.15 by afe, Thu Jan 29 15:39:49 2004 UTC revision 1.16 by afe, Thu Jan 29 16:02:58 2004 UTC
# Line 1267  The \_EXCH operation is also central to Line 1267  The \_EXCH operation is also central to
1267  the cube-sphere grid. In this class of grid a rotation may be required  the cube-sphere grid. In this class of grid a rotation may be required
1268  between tiles. Aligning the coordinate requiring rotation with the  between tiles. Aligning the coordinate requiring rotation with the
1269  tile decomposition, allows the coordinate transformation to  tile decomposition, allows the coordinate transformation to
1270  be embedded within a custom form of the \_EXCH primitive.  be embedded within a custom form of the \_EXCH primitive.  In these
1271    cases \_EXCH is mapped to exch2 routines, as detailed in the exch2
1272    package documentation  \ref{sec:exch2}.
1273    
1274  \item {\bf Reverse Mode}  \item {\bf Reverse Mode}
1275  The communication primitives \_EXCH and \_GSUM both employ  The communication primitives \_EXCH and \_GSUM both employ
# Line 1284  operations. However, the routine argumen Line 1286  operations. However, the routine argumen
1286  is set to the value {\em REVERSE\_SIMULATION}. This signifies  is set to the value {\em REVERSE\_SIMULATION}. This signifies
1287  ti the low-level routines that the adjoint forms of the  ti the low-level routines that the adjoint forms of the
1288  appropriate communication operation should be performed.  appropriate communication operation should be performed.
1289    
1290  \item {\bf MAX\_NO\_THREADS}  \item {\bf MAX\_NO\_THREADS}
1291  The variable {\em MAX\_NO\_THREADS} is used to indicate the  The variable {\em MAX\_NO\_THREADS} is used to indicate the
1292  maximum number of OS threads that a code will use. This  maximum number of OS threads that a code will use. This
# Line 1388  a series of template files, for example Line 1391  a series of template files, for example
1391  This is done to allow a large number of variations on the exchange  This is done to allow a large number of variations on the exchange
1392  process to be maintained. One set of variations supports the  process to be maintained. One set of variations supports the
1393  cube sphere grid. Support for a cube sphere grid in MITgcm is based  cube sphere grid. Support for a cube sphere grid in MITgcm is based
1394  on having each face of the cube as a separate tile (or tiles).  on having each face of the cube as a separate tile or tiles.
1395  The exchange routines are then able to absorb much of the  The exchange routines are then able to absorb much of the
1396  detailed rotation and reorientation required when moving around the  detailed rotation and reorientation required when moving around the
1397  cube grid. The set of {\em \_EXCH} routines that contain the  cube grid. The set of {\em \_EXCH} routines that contain the
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