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209 lines
5.6 KiB
HTML
209 lines
5.6 KiB
HTML
17 years ago
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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<!--Converted with LaTeX2HTML 2002-2-1 (1.71)
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original version by: Nikos Drakos, CBLU, University of Leeds
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* revised and updated by: Marcus Hennecke, Ross Moore, Herb Swan
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* with significant contributions from:
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Jens Lippmann, Marek Rouchal, Martin Wilck and others -->
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<HTML>
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<HEAD>
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<TITLE>psb_cdbldext -- Build an extended communication descriptor</TITLE>
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<BODY >
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<BR>
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<B> Next:</B> <A NAME="tex2html789"
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HREF="node49.html">psb_spall Allocates</A>
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<B> Up:</B> <A NAME="tex2html785"
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HREF="node42.html">Data management routines</A>
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<B> Previous:</B> <A NAME="tex2html779"
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HREF="node47.html">psb_cdfree Frees</A>
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<B> <A NAME="tex2html787"
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HREF="node1.html">Contents</A></B>
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<BR>
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<BR>
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<!--End of Navigation Panel-->
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<H2><A NAME="SECTION00076000000000000000">
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psb_cdbldext -- Build an extended communication
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descriptor</A>
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</H2>
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<P>
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<PRE>
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call psb_cdbldext(a,desc_a,nl,desc_out, info, extype)
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</PRE>
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<P>
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This subroutine builds an extended communication descriptor, based on
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the input descriptor <code>desc_a</code> and on the stencil specified
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through the input sparse matrix <code>a</code>.
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<DL>
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<DT><STRONG>Type:</STRONG></DT>
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<DD>Synchronous.
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</DD>
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<DT><STRONG><B>On Entry</B></STRONG></DT>
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<DD>
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</DD>
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<DT><STRONG>a</STRONG></DT>
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<DD>A sparse matrix
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Scope:<B>local</B>.
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<BR>
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Type:<B>required</B>.
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<BR>
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Intent: <B>in</B>.
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<BR>
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Specified as: a structured data type.
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</DD>
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<DT><STRONG>desc_a</STRONG></DT>
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<DD>the communication descriptor.
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<BR>
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Scope:<B>local</B>.
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<BR>
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Type:<B>required</B>.
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<BR>
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Intent: <B>in</B>.
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<BR>
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Specified as: a structured data of type spdata<TT>psb_spmat_type</TT>.
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</DD>
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<DT><STRONG>nl</STRONG></DT>
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<DD>the number of additional layers desired.
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<BR>
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Scope:<B>global</B>.
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<BR>
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Type:<B>required</B>.
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<BR>
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Intent: <B>in</B>.
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<BR>
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Specified as: an integer value <IMG
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WIDTH="47" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img96.png"
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ALT="$nl\ge 0$">.
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</DD>
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<DT><STRONG>extype</STRONG></DT>
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<DD>the kind of estension required.
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<BR>
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Scope:<B>global</B>.
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<BR>
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Type:<B>optional </B>.
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<BR>
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Intent: <B>in</B>.
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<BR>
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Specified as: an integer value
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<code>psb_ovt_xhal_</code>, <code>psb_ovt_asov_</code>, default: <code>psb_ovt_xhal_</code>
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<P>
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</DD>
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</DL>
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<P>
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<DL>
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<DT><STRONG><B>On Return</B></STRONG></DT>
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<DD>
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</DD>
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<DT><STRONG>desc_out</STRONG></DT>
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<DD>the extended communication descriptor.
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<BR>
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Scope:<B>local</B>.
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<BR>
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Type:<B>required</B>.
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<BR>
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Intent: <B>inout</B>.
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<BR>
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Specified as: a structured data of type descdata<TT>psb_desc_type</TT>.
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</DD>
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<DT><STRONG>info</STRONG></DT>
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<DD>Error code.
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<BR>
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Scope: <B>local</B>
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<BR>
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Type: <B>required</B>
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<BR>
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Intent: <B>out</B>.
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<BR>
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An integer value; 0 means no error has been detected.
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</DD>
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</DL>
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<P>
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<FONT SIZE="+1"><B>Notes</B></FONT>
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<OL>
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<LI>Specifying <code>psb_ovt_xhal_</code> for the <code>extype</code> argument
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the user will obtain a descriptor for a domain partition in which
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the additional layers are fetched as part of an (extended) halo;
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however the index-to-process mapping is identical to that of the
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base descriptor;
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</LI>
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<LI>Specifying <code>psb_ovt_asov_</code> for the <code>extype</code> argument
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the user will obtain a descriptor with an overlapped decomposition:
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the additional layer is aggregated to the local subdomain (and thus
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is an overlap), and a new halo extending beyond the last additional
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layer is formed.
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</LI>
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</OL>
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<P>
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<HR>
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<!--Navigation Panel-->
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<A NAME="tex2html788"
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SRC="file:/usr/share/latex2html/icons/next.png"></A>
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HREF="node42.html">
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<IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up"
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SRC="file:/usr/share/latex2html/icons/up.png"></A>
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HREF="node47.html">
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SRC="file:/usr/share/latex2html/icons/prev.png"></A>
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<A NAME="tex2html786"
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HREF="node1.html">
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<IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents"
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SRC="file:/usr/share/latex2html/icons/contents.png"></A>
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<BR>
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<B> Next:</B> <A NAME="tex2html789"
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HREF="node49.html">psb_spall Allocates</A>
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<B> Up:</B> <A NAME="tex2html785"
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HREF="node42.html">Data management routines</A>
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<B> Previous:</B> <A NAME="tex2html779"
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HREF="node47.html">psb_cdfree Frees</A>
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<B> <A NAME="tex2html787"
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HREF="node1.html">Contents</A></B>
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<!--End of Navigation Panel-->
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</HTML>
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