/[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 1.17 by afe, Tue Mar 23 15:29:40 2004 UTC
# Line 76  floating point operations.} Line 76  floating point operations.}
76  \end{figure}  \end{figure}
77    
78  \section{WRAPPER}  \section{WRAPPER}
79    \begin{rawhtml}
80    <!-- CMIREDIR:wrapper -->
81    \end{rawhtml}
82    
83  A significant element of the software architecture utilized in  A significant element of the software architecture utilized in
84  MITgcm is a software superstructure and substructure collectively  MITgcm is a software superstructure and substructure collectively
# Line 150  easily be specialized to fit, in a compu Line 153  easily be specialized to fit, in a compu
153  computer architecture currently available to the scientific computing community.  computer architecture currently available to the scientific computing community.
154    
155  \subsection{Machine model parallelism}  \subsection{Machine model parallelism}
156    \begin{rawhtml}
157    <!-- CMIREDIR:domain_decomp -->
158    \end{rawhtml}
159    
160   Codes operating under the WRAPPER target an abstract machine that is assumed to   Codes operating under the WRAPPER target an abstract machine that is assumed to
161  consist of one or more logical processors that can compute concurrently.    consist of one or more logical processors that can compute concurrently.  
# Line 1267  The \_EXCH operation is also central to Line 1273  The \_EXCH operation is also central to
1273  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
1274  between tiles. Aligning the coordinate requiring rotation with the  between tiles. Aligning the coordinate requiring rotation with the
1275  tile decomposition, allows the coordinate transformation to  tile decomposition, allows the coordinate transformation to
1276  be embedded within a custom form of the \_EXCH primitive.  be embedded within a custom form of the \_EXCH primitive.  In these
1277    cases \_EXCH is mapped to exch2 routines, as detailed in the exch2
1278    package documentation  \ref{sec:exch2}.
1279    
1280  \item {\bf Reverse Mode}  \item {\bf Reverse Mode}
1281  The communication primitives \_EXCH and \_GSUM both employ  The communication primitives \_EXCH and \_GSUM both employ
# Line 1284  operations. However, the routine argumen Line 1292  operations. However, the routine argumen
1292  is set to the value {\em REVERSE\_SIMULATION}. This signifies  is set to the value {\em REVERSE\_SIMULATION}. This signifies
1293  ti the low-level routines that the adjoint forms of the  ti the low-level routines that the adjoint forms of the
1294  appropriate communication operation should be performed.  appropriate communication operation should be performed.
1295    
1296  \item {\bf MAX\_NO\_THREADS}  \item {\bf MAX\_NO\_THREADS}
1297  The variable {\em MAX\_NO\_THREADS} is used to indicate the  The variable {\em MAX\_NO\_THREADS} is used to indicate the
1298  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 1397  a series of template files, for example
1397  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
1398  process to be maintained. One set of variations supports the  process to be maintained. One set of variations supports the
1399  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
1400  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.
1401  The exchange routines are then able to absorb much of the  The exchange routines are then able to absorb much of the
1402  detailed rotation and reorientation required when moving around the  detailed rotation and reorientation required when moving around the
1403  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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