/[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 1.20 by edhill,
Sat Oct 16 03:40:16 2004 UTC
 Line 17 
 details of the MITgcm implementation and
  features that are employed.
  \section{Overall architectural goals}
+ \begin{rawhtml}
+ <!-- CMIREDIR:overall_architectural_goals: -->
+ \end{rawhtml}
  Broadly, the goals of the software architecture employed in MITgcm are
  three-fold
-Line 76 
 floating point operations.}
+Line 79 
 floating point operations.}
  \end{figure}
  \section{WRAPPER}
+ \begin{rawhtml}
+ <!-- CMIREDIR:wrapper: -->
+ \end{rawhtml}
  A significant element of the software architecture utilized in
  MITgcm is a software superstructure and substructure collectively
-Line 150 
 easily be specialized to fit, in a compu
+Line 156 
 easily be specialized to fit, in a compu
  computer architecture currently available to the scientific computing community.
  \subsection{Machine model parallelism}
+ \begin{rawhtml}
+ <!-- CMIREDIR:domain_decomp: -->
+ \end{rawhtml}
   Codes operating under the WRAPPER target an abstract machine that is assumed to
  consist of one or more logical processors that can compute concurrently.
-Line 537 
 of almost all successful scientific comp
+Line 546 
 of almost all successful scientific comp
  last 50 years.
  \section{Using the WRAPPER}
+ \begin{rawhtml}
+ <!-- CMIREDIR:using_the_wrapper: -->
+ \end{rawhtml}
  In order to support maximum portability the WRAPPER is implemented primarily
  in sequential Fortran 77. At a practical level the key steps provided by the
-Line 1267 
 The \_EXCH operation is also central to
+Line 1279 
 The \_EXCH operation is also central to
  the cube-sphere grid. In this class of grid a rotation may be required
  between tiles. Aligning the coordinate requiring rotation with the
  tile decomposition, allows the coordinate transformation to
- be embedded within a custom form of the \_EXCH primitive.
+ be embedded within a custom form of the \_EXCH primitive.  In these
+ cases \_EXCH is mapped to exch2 routines, as detailed in the exch2
+ package documentation  \ref{sec:exch2}.
  \item {\bf Reverse Mode}
  The communication primitives \_EXCH and \_GSUM both employ
-Line 1284 
 operations. However, the routine argumen
+Line 1298 
 operations. However, the routine argumen
  is set to the value {\em REVERSE\_SIMULATION}. This signifies
  ti the low-level routines that the adjoint forms of the
  appropriate communication operation should be performed.
  \item {\bf MAX\_NO\_THREADS}
  The variable {\em MAX\_NO\_THREADS} is used to indicate the
  maximum number of OS threads that a code will use. This
-Line 1388 
 a series of template files, for example
+Line 1403 
 a series of template files, for example
  This is done to allow a large number of variations on the exchange
  process to be maintained. One set of variations supports the
  cube sphere grid. Support for a cube sphere grid in MITgcm is based
- 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.
  The exchange routines are then able to absorb much of the
  detailed rotation and reorientation required when moving around the
  cube grid. The set of {\em \_EXCH} routines that contain the
-Line 1412 
 quantities at the C-grid vorticity point
+Line 1427 
 quantities at the C-grid vorticity point
  \section{MITgcm execution under WRAPPER}
+ \begin{rawhtml}
+ <!-- CMIREDIR:mitgcm_wrapper: -->
+ \end{rawhtml}
  Fitting together the WRAPPER elements, package elements and
  MITgcm core equation elements of the source code produces calling

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