36 |
\subsection{Key Variables} |
\subsection{Key Variables} |
37 |
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38 |
The descriptions of the variables are divided up into scalars, |
The descriptions of the variables are divided up into scalars, |
39 |
one-dimensional arrays indexed to the tile number, and two-dimensional |
one-dimensional arrays indexed to the tile number, and two and three |
40 |
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dimensional |
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arrays indexed to tile number and neighboring tile. This division |
arrays indexed to tile number and neighboring tile. This division |
42 |
actually reflects the functionality of these variables, not just the |
actually reflects the functionality of these variables: the scalars |
43 |
whim of some FORTRAN enthusiast. |
are common to every part of the topology, the tile-indexed arrays to |
44 |
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individual tiles, and the arrays indexed to tile and neighbor to |
45 |
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relationships between tiles and their neighbors. |
46 |
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47 |
\subsubsection{Scalars} |
\subsubsection{Scalars} |
48 |
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63 |
arrays. The tiles are internally stored in a range from {\em 1,bi} (in the |
arrays. The tiles are internally stored in a range from {\em 1,bi} (in the |
64 |
x axis) and y-axis variable {\em bj} is generally ignored within the package. |
x axis) and y-axis variable {\em bj} is generally ignored within the package. |
65 |
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66 |
\subsubsection{One-Dimensional Arrays} |
\subsubsection{Arrays Indexed to Tile Number} |
67 |
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68 |
The following arrays are of size {\em NTILES}, are indexed to the tile number, |
The following arrays are of size {\em NTILES}, are indexed to the tile number, |
69 |
and the indices are omitted in their descriptions. |
and the indices are omitted in their descriptions. |
100 |
over neighboring tiles. {\em exch2\_tProc} holds the process rank of each tile, |
over neighboring tiles. {\em exch2\_tProc} holds the process rank of each tile, |
101 |
and is used in interprocess communication. |
and is used in interprocess communication. |
102 |
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103 |
\subsubsection{Two-Dimensional Arrays} |
\subsubsection{Arrays Indexed to Tile Number and Neighbor} |
104 |
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105 |
The following arrays are all of size {\em MAX\_NEIGHBOURS}x{\em NTILES} and |
The following arrays are all of size {\em MAX\_NEIGHBOURS}x{\em NTILES} and |
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describe the orientations between the the tiles. |
describe the orientations between the the tiles. |
114 |
exch2_neighbourId( exch2_opposingSend_record(a,T), exch2_neighbourId(a,T) ) = T |
exch2_neighbourId( exch2_opposingSend_record(a,T), exch2_neighbourId(a,T) ) = T |
115 |
\end{verbatim} |
\end{verbatim} |
116 |
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117 |
{\em exch2\_neighbourId(exch2\_opposingSend\_record(a,T),exch2\_neighbourId(a,T))=T}. |
% {\em exch2\_neighbourId(exch2\_opposingSend\_record(a,T),exch2\_neighbourId(a,T))=T}. |
118 |
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% alternate version |
119 |
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120 |
This is to provide a backreference from the neighbor tiles. |
This is to provide a backreference from the neighbor tiles. |
121 |
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122 |
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125 |
\begin{verbatim} |
\begin{verbatim} |
126 |
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127 |
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128 |
C exch2_neighbourId :: Tile number for each neighbour entry. |
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C exch2_opposingSend_record :: Record for entry in target tile send |
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C :: list that has this tile and face |
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C :: as its target. |
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129 |
C exch2_pi :: X index row of target to source permutation |
C exch2_pi :: X index row of target to source permutation |
130 |
C :: matrix for each neighbour entry. |
C :: matrix for each neighbour entry. |
131 |
C exch2_pj :: Y index row of target to source permutation |
C exch2_pj :: Y index row of target to source permutation |