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Salvatore Filippone
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@@ -7,8 +7,8 @@ original version by: Nikos Drakos, CBLU, University of Leeds
Jens Lippmann, Marek Rouchal, Martin Wilck and others -->
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<TITLE>psb_cdasb -- Communication descriptor assembly routine</TITLE>
<META NAME="description" CONTENT="psb_cdasb -- Communication descriptor assembly routine">
<TITLE>psb_cdins -- Communication descriptor insert routine</TITLE>
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<H2><A NAME="SECTION00073000000000000000">
psb_cdasb -- Communication descriptor assembly
<H2><A NAME="SECTION00072000000000000000">
psb_cdins -- Communication descriptor insert
routine</A>
</H2>
<P>
<PRE>
call psb_cdasb(desc_a, info)
call psb_cdins(nz, ia, ja, desc_a, info [,ila,jla])
call psb_cdins(nz,ja,desc,info[,jla,mask,lidx])
</PRE>
<P>
This subroutine examines the edges of the graph associated with the
discretization mesh (and isomorphic to the sparsity pattern of a
linear system coefficient matrix), storing them as necessary into the
communication descriptor. In the first form the edges are specified as
pairs of indices <IMG
WIDTH="77" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
SRC="img99.png"
ALT="$ia(i),ja(i)$">; the starting index <IMG
WIDTH="35" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
SRC="img100.png"
ALT="$ia(i)$"> should
belong to the current process.
In the second form only the remote indices <IMG
WIDTH="38" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
SRC="img101.png"
ALT="$ja(i)$"> are specified.
<P>
<DL>
<DT><STRONG>Type:</STRONG></DT>
<DD>Synchronous.
<DD>Asynchronous.
</DD>
<DT><STRONG><B>On Entry</B></STRONG></DT>
<DD>
</DD>
<DT><STRONG>desc_a</STRONG></DT>
<DD>the communication descriptor.
<DT><STRONG>nz</STRONG></DT>
<DD>the number of points being inserted.
<BR>
Scope:<B>local</B>.
Scope: <B>local</B>.
<BR>
Type:<B>required</B>.
Type: <B>required</B>.
<BR>
Intent: <B>inout</B>.
Intent: <B>in</B>.
<BR>
Specified as: a structured data of type descdata<TT>psb_desc_type</TT>.
Specified as: an integer value.
</DD>
<DT><STRONG>ia</STRONG></DT>
<DD>the indices of the starting vertex of the edges being inserted.
<BR>
Scope: <B>local</B>.
<BR>
Type: <B>required</B>.
<BR>
Intent: <B>in</B>.
<BR>
Specified as: an integer array of length <IMG
WIDTH="21" HEIGHT="13" ALIGN="BOTTOM" BORDER="0"
SRC="img102.png"
ALT="$nz$">.
</DD>
<DT><STRONG>ja</STRONG></DT>
<DD>the indices of the end vertex of the edges being inserted.
<BR>
Scope: <B>local</B>.
<BR>
Type: <B>required</B>.
<BR>
Intent: <B>in</B>.
<BR>
Specified as: an integer array of length <IMG
WIDTH="21" HEIGHT="13" ALIGN="BOTTOM" BORDER="0"
SRC="img102.png"
ALT="$nz$">.
</DD>
<DT><STRONG>mask</STRONG></DT>
<DD>Mask entries in <code>ja</code>, they are inserted only when the
corresponding <code>mask</code> entries are <code>.true.</code>
<BR>
Scope: <B>local</B>.
<BR>
Type: <B>optional</B>.
<BR>
Intent: <B>in</B>.
<BR>
Specified as: a logical array of length <IMG
WIDTH="21" HEIGHT="13" ALIGN="BOTTOM" BORDER="0"
SRC="img102.png"
ALT="$nz$">, default <code>.true.</code>.
</DD>
<DT><STRONG>lidx</STRONG></DT>
<DD>User defined local indices for <code>ja</code>.
<BR>
Scope: <B>local</B>.
<BR>
Type: <B>optional</B>.
<BR>
Intent: <B>in</B>.
<BR>
Specified as: an integer array of length <IMG
WIDTH="21" HEIGHT="13" ALIGN="BOTTOM" BORDER="0"
SRC="img102.png"
ALT="$nz$">.
</DD>
</DL>
@@ -88,7 +164,7 @@ Specified as: a structured data of type descdata<TT>psb_desc_type</TT>.
<DD>
</DD>
<DT><STRONG>desc_a</STRONG></DT>
<DD>the communication descriptor.
<DD>the updated communication descriptor.
<BR>
Scope:<B>local</B>.
<BR>
@@ -109,17 +185,77 @@ Intent: <B>out</B>.
<BR>
An integer value; 0 means no error has been detected.
</DD>
<DT><STRONG>ila</STRONG></DT>
<DD>the local indices of the starting vertex of the edges being inserted.
<BR>
Scope: <B>local</B>.
<BR>
Type: <B>optional</B>.
<BR>
Intent: <B>out</B>.
<BR>
Specified as: an integer array of length <IMG
WIDTH="21" HEIGHT="13" ALIGN="BOTTOM" BORDER="0"
SRC="img102.png"
ALT="$nz$">.
</DD>
<DT><STRONG>jla</STRONG></DT>
<DD>the local indices of the end vertex of the edges being inserted.
<BR>
Scope: <B>local</B>.
<BR>
Type: <B>optional</B>.
<BR>
Intent: <B>out</B>.
<BR>
Specified as: an integer array of length <IMG
WIDTH="21" HEIGHT="13" ALIGN="BOTTOM" BORDER="0"
SRC="img102.png"
ALT="$nz$">.
<P>
</DD>
</DL>
<FONT SIZE="+1"><B>Notes</B></FONT>
<OL>
<LI>On exit from this routine the descriptor is in the assembled
state.
<LI>This routine may only be called if the descriptor is in the
build state;
</LI>
<LI>This routine automatically ignores edges that do not
insist on the current process, i.e. edges for which neither the starting
nor the end vertex belong to the current process.
</LI>
<LI>The second form of this routine will be useful when dealing with
user-specified index mappings; see also&nbsp;<A HREF="node7.html#sec:usermaps">2.3.1</A>.
</LI>
</OL>
<P>
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