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This commit is contained in:
Salvatore Filippone
+315
-138
@@ -7,8 +7,8 @@ original version by: Nikos Drakos, CBLU, University of Leeds
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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_spins -- Insert a cloud of elements into a sparse matrix</TITLE>
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<META NAME="description" CONTENT="psb_spins -- Insert a cloud of elements into a sparse matrix">
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<TITLE>psb_cdall -- Allocates a communication descriptor</TITLE>
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<META NAME="description" CONTENT="psb_cdall -- Allocates a communication descriptor">
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<META NAME="keywords" CONTENT="userhtml">
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<META NAME="resource-type" CONTENT="document">
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<META NAME="distribution" CONTENT="global">
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@@ -20,134 +20,207 @@ original version by: Nikos Drakos, CBLU, University of Leeds
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<LINK REL="next" HREF="node67.html">
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<LINK REL="previous" HREF="node65.html">
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<LINK REL="up" HREF="node65.html">
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<LINK REL="next" HREF="node67.html">
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</HEAD>
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<BODY >
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<!--Navigation Panel-->
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<A NAME="tex2html1045"
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<A NAME="tex2html1066"
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<IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="next.png"></A>
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<A NAME="tex2html1064"
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HREF="node1.html">
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<IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="contents.png"></A>
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<BR>
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<B> Next:</B> <A NAME="tex2html1046"
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HREF="node67.html">psb_spasb Sparse</A>
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<B> Up:</B> <A NAME="tex2html1042"
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HREF="node58.html">Data management routines</A>
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<B> Previous:</B> <A NAME="tex2html1036"
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HREF="node65.html">psb_spall Allocates</A>
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<B> <A NAME="tex2html1044"
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<B> Next:</B> <A NAME="tex2html1067"
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HREF="node67.html">psb_cdins Communication</A>
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<B> Up:</B> <A NAME="tex2html1063"
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HREF="node65.html">Data management routines</A>
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<B> Previous:</B> <A NAME="tex2html1057"
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HREF="node65.html">Data management routines</A>
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<B> <A NAME="tex2html1065"
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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="SECTION00078000000000000000">
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psb_spins -- Insert a cloud of elements into a sparse
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matrix</A>
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<H2><A NAME="SECTION00071000000000000000">
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psb_cdall -- Allocates a communication descriptor</A>
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</H2>
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<P>
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<PRE>
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call psb_spins(nz, ia, ja, val, a, desc_a, info [,local])
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call psb_cdall(icontxt, desc_a, info,mg=mg,parts=parts)
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call psb_cdall(icontxt, desc_a, info,vg=vg,[mg=mg,flag=flag])
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call psb_cdall(icontxt, desc_a, info,vl=vl,[nl=nl,globalcheck=.true.,lidx=lidx])
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call psb_cdall(icontxt, desc_a, info,nl=nl)
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call psb_cdall(icontxt, desc_a, info,mg=mg,repl=.true.)
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</PRE>
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<P>
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This subroutine initializes the communication descriptor associated
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with an index space. One of the optional arguments
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<code>parts</code>, <code>vg</code>, <code>vl</code>, <code>nl</code> or <code>repl</code>
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must be specified, thereby choosing
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the specific initialization strategy.
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<DL>
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<DT><STRONG>Type:</STRONG></DT>
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<DD>Asynchronous.
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</DD>
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<DT><STRONG><B>On Entry</B></STRONG></DT>
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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>nz</STRONG></DT>
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<DD>the number of elements to be inserted.
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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>icontxt</STRONG></DT>
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<DD>the communication context.
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<BR>
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Scope:<B>local</B>.
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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 scalar.
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Specified as: an integer value.
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</DD>
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<DT><STRONG>ia</STRONG></DT>
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<DD>the row indices of the elements to be inserted.
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<DT><STRONG>vg</STRONG></DT>
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<DD>Data allocation: each index <!-- MATH
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$i\in \{1\dots mg\}$
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-->
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<IMG
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WIDTH="99" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
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SRC="img83.png"
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ALT="$i\in \{1\dots mg\}$"> is allocated
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to process <IMG
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WIDTH="38" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
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SRC="img84.png"
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ALT="$vg(i)$">.
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<BR>
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Scope:<B>local</B>.
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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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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 array of size <IMG
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WIDTH="21" HEIGHT="13" ALIGN="BOTTOM" BORDER="0"
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SRC="img102.png"
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ALT="$nz$">.
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Specified as: an integer array.
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</DD>
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<DT><STRONG>ja</STRONG></DT>
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<DD>the column indices of the elements to be inserted.
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<DT><STRONG>flag</STRONG></DT>
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<DD>Specifies whether entries in <IMG
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WIDTH="21" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img85.png"
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ALT="$vg$"> are zero- or one-based.
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<BR>
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Scope:<B>local</B>.
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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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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 array of size <IMG
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WIDTH="21" HEIGHT="13" ALIGN="BOTTOM" BORDER="0"
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SRC="img102.png"
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ALT="$nz$">.
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Specified as: an integer value <IMG
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WIDTH="27" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img86.png"
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ALT="$0,1$">, default <IMG
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WIDTH="12" HEIGHT="13" ALIGN="BOTTOM" BORDER="0"
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SRC="img87.png"
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ALT="$0$">.
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<P>
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</DD>
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<DT><STRONG>val</STRONG></DT>
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<DD>the elements to be inserted.
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<DT><STRONG>mg</STRONG></DT>
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<DD>the (global) number of rows of the problem.
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<BR>
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Scope:<B>local</B>.
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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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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 array of size <IMG
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WIDTH="21" HEIGHT="13" ALIGN="BOTTOM" BORDER="0"
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SRC="img102.png"
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ALT="$nz$">. Must be of the same type and kind
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of the coefficients of the sparse matrix <IMG
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WIDTH="13" HEIGHT="13" ALIGN="BOTTOM" BORDER="0"
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SRC="img105.png"
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ALT="$a$">.
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Specified as: an integer value. It is required if <code>parts</code> or
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<code>repl</code> is specified, it is optional if <code>vg</code> is specified.
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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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<DT><STRONG>parts</STRONG></DT>
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<DD>the subroutine that defines the partitioning scheme.
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<BR>
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Scope: <B>local</B>.
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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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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 variable of type descdata<TT>psb_desc_type</TT>.
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<BR></DD>
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<DT><STRONG>local</STRONG></DT>
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<DD>Whether the entries in the indices vectors <code>ia</code>,
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<code>ja</code> are already in local numbering.
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Specified as: a subroutine.
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</DD>
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<DT><STRONG>vl</STRONG></DT>
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<DD>Data allocation: the set of global indices
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<IMG
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WIDTH="65" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
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SRC="img88.png"
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ALT="$vl(1:nl)$"> belonging to the calling process.
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<BR>
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Scope:<B>local</B>.
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<BR>
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Type:<B>optional</B>.
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<BR>
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Specified as: a logical value; default: <code>.false.</code>.
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<P>
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Intent: <B>in</B>.
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<BR>
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Specified as: an integer array.
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</DD>
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<DT><STRONG>nl</STRONG></DT>
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<DD>Data allocation: in a generalized block-row distribution the
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number of indices belonging to the current process.
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<BR>
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Scope:<B>local</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. May be specified together with
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<code>vl</code>.
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</DD>
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<DT><STRONG>repl</STRONG></DT>
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<DD>Data allocation: build a replicated index space
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(i.e. all processes own all indices).
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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: the logical value <code>.true.</code>
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</DD>
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<DT><STRONG>globalcheck</STRONG></DT>
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<DD>Data allocation: do global checks on the local
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index lists <code>vl</code>
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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: a logical value, default: <code>.true.</code>
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</DD>
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<DT><STRONG>lidx</STRONG></DT>
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<DD>Data allocation: the set of local indices
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<IMG
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WIDTH="81" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
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SRC="img89.png"
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ALT="$lidx(1:nl)$"> to be assigned to the global indices <IMG
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WIDTH="17" HEIGHT="14" ALIGN="BOTTOM" BORDER="0"
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SRC="img90.png"
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ALT="$vl$">.
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<BR>
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Scope:<B>local</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 array.
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</DD>
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</DL>
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@@ -156,28 +229,17 @@ Specified as: a logical value; default: <code>.false.</code>.
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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>a</STRONG></DT>
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<DD>the matrix into which elements will be inserted.
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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 spdata<TT>psb_Tspmat_type</TT>.
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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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<DD>the communication descriptor.
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<BR>
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Scope: <B>local</B>.
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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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Type:<B>required</B>.
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<BR>
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Intent: <B>inout</B>.
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Intent: <B>out</B>.
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<BR>
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Specified as: a variable of type descdata<TT>psb_desc_type</TT>.
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<BR></DD>
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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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@@ -195,79 +257,194 @@ An integer value; 0 means no error has been detected.
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<FONT SIZE="+1"><B>Notes</B></FONT>
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<OL>
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<LI>On entry to this routine the descriptor may be in either the
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build or assembled state.
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</LI>
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<LI>On entry to this routine the sparse matrix may be in either the
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build or update state.
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</LI>
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<LI>If the descriptor is in the build state, then the sparse matrix
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must also be in the build state; the action of the routine is to
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(implicitly) call <code>psb_cdins</code> to add entries to the sparsity
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pattern; each sparse matrix entry implicitly defines a graph edge,
|
||||
that is passed to the descriptor routine for the appropriate
|
||||
processing;
|
||||
</LI>
|
||||
<LI>The coefficients to be inserted are represented by the ordered
|
||||
triples <!-- MATH
|
||||
$ia(i),ja(i),val(i)$
|
||||
<LI>One of the optional arguments <code>parts</code>, <code>vg</code>,
|
||||
<code>vl</code>, <code>nl</code> or <code>repl</code> must be specified, thereby choosing the
|
||||
initialization strategy as follows:
|
||||
<DL>
|
||||
<DT><STRONG>parts</STRONG></DT>
|
||||
<DD>In this case we have a subroutine specifying the mapping
|
||||
between global indices and process/local index pairs. If this
|
||||
optional argument is specified, then it is mandatory to
|
||||
specify the argument <code>mg</code> as well.
|
||||
The subroutine must conform to the following interface:
|
||||
<PRE>
|
||||
interface
|
||||
subroutine psb_parts(glob_index,mg,np,pv,nv)
|
||||
integer, intent (in) :: glob_index,np,mg
|
||||
integer, intent (out) :: nv, pv(*)
|
||||
end subroutine psb_parts
|
||||
end interface
|
||||
</PRE>
|
||||
The input arguments are:
|
||||
<DL>
|
||||
<DT><STRONG>glob_index</STRONG></DT>
|
||||
<DD>The global index to be mapped;
|
||||
|
||||
</DD>
|
||||
<DT><STRONG>np</STRONG></DT>
|
||||
<DD>The number of processes in the mapping;
|
||||
|
||||
</DD>
|
||||
<DT><STRONG>mg</STRONG></DT>
|
||||
<DD>The total number of global rows in the mapping;
|
||||
|
||||
</DD>
|
||||
</DL>
|
||||
The output arguments are:
|
||||
<DL>
|
||||
<DT><STRONG>nv</STRONG></DT>
|
||||
<DD>The number of entries in <code>pv</code>;
|
||||
|
||||
</DD>
|
||||
<DT><STRONG>pv</STRONG></DT>
|
||||
<DD>A vector containing the indices of the processes to
|
||||
which the global index should be assigend; each entry must satisfy
|
||||
<!-- MATH
|
||||
$0\le pv(i) < np$
|
||||
-->
|
||||
<IMG
|
||||
WIDTH="123" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
|
||||
SRC="img106.png"
|
||||
ALT="$ia(i),ja(i),val(i)$">, for <IMG
|
||||
WIDTH="92" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
|
||||
SRC="img107.png"
|
||||
ALT="$i=1,\dots,nz$">; these triples
|
||||
should belong to the current process, i.e. <IMG
|
||||
WIDTH="35" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
|
||||
SRC="img100.png"
|
||||
ALT="$ia(i)$"> should be one of
|
||||
the local indices, but are otherwise arbitrary;
|
||||
WIDTH="107" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
|
||||
SRC="img91.png"
|
||||
ALT="$0\le pv(i) < np$">; if <IMG
|
||||
WIDTH="51" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
|
||||
SRC="img92.png"
|
||||
ALT="$nv>1$"> we have an index assigned to multiple
|
||||
processes, i.e. we have an overlap among the subdomains.
|
||||
|
||||
</DD>
|
||||
</DL>
|
||||
</DD>
|
||||
<DT><STRONG>vg</STRONG></DT>
|
||||
<DD>In this case the association between an index and a process
|
||||
is specified via an integer vector <code>vg(1:mg)</code>;
|
||||
each index <!-- MATH
|
||||
$i \in \{1\dots mg\}$
|
||||
-->
|
||||
<IMG
|
||||
WIDTH="99" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
|
||||
SRC="img83.png"
|
||||
ALT="$i\in \{1\dots mg\}$"> is assigned to process <IMG
|
||||
WIDTH="38" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
|
||||
SRC="img84.png"
|
||||
ALT="$vg(i)$">.
|
||||
The vector <code>vg</code> must be identical on all
|
||||
calling processes; its entries may have the ranges <IMG
|
||||
WIDTH="94" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
|
||||
SRC="img93.png"
|
||||
ALT="$(0\dots np-1)$">
|
||||
or <IMG
|
||||
WIDTH="65" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
|
||||
SRC="img94.png"
|
||||
ALT="$(1\dots np)$"> according to the value of <code>flag</code>.
|
||||
The size <IMG
|
||||
WIDTH="27" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
|
||||
SRC="img95.png"
|
||||
ALT="$mg$"> may be specified via the optional argument <code>mg</code>;
|
||||
the default is to use the entire vector <code>vg</code>, thus having
|
||||
<code>mg=size(vg)</code>.
|
||||
</DD>
|
||||
<DT><STRONG>vl</STRONG></DT>
|
||||
<DD>In this case we are specifying the list of indices
|
||||
<code>vl(1:nl)</code> assigned to the current process; thus, the global
|
||||
problem size <IMG
|
||||
WIDTH="27" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
|
||||
SRC="img95.png"
|
||||
ALT="$mg$"> is given by
|
||||
the range of the aggregate of the individual vectors <code>vl</code> specified
|
||||
in the calling processes. The size may be specified via the optional
|
||||
argument <code>nl</code>; the default is to use the entire vector
|
||||
<code>vl</code>, thus having <code>nl=size(vl)</code>.
|
||||
If <code>globalcheck=.true.</code> the subroutine will check how many
|
||||
times each entry in the global index space <IMG
|
||||
WIDTH="70" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
|
||||
SRC="img96.png"
|
||||
ALT="$(1\dots mg)$"> is
|
||||
specified in the input lists <code>vl</code>, thus allowing for the
|
||||
presence of overlap in the input, and checking for ``orphan''
|
||||
indices. If <code>globalcheck=.false.</code>, the subroutine will not
|
||||
check for overlap, and may be significantly faster, but the user
|
||||
is implicitly guaranteeing that there are neither orphan nor
|
||||
overlap indices.
|
||||
</DD>
|
||||
<DT><STRONG>lidx</STRONG></DT>
|
||||
<DD>The optional argument <code>lidx</code> is available for
|
||||
those cases in which the user has already established a
|
||||
global-to-local mapping; if it is specified, each index in
|
||||
<code>vl(i)</code> will be mapped to the corresponding local index
|
||||
<code>lidx(i)</code>. When specifying the argument <code>lidx</code> the user
|
||||
would also likely employ <code>lidx</code> in calls to <code>psb_cdins</code>
|
||||
and <code>local</code> in calls to <code>psb_spins</code> and <code>psb_geins</code>;
|
||||
see also sec. <A HREF="node7.html#sec:usermaps">2.3.1</A>.
|
||||
</DD>
|
||||
<DT><STRONG>nl</STRONG></DT>
|
||||
<DD>If this argument is specified alone (i.e. without <code>vl</code>)
|
||||
the result is a generalized row-block distribution in which each
|
||||
process <IMG
|
||||
WIDTH="13" HEIGHT="14" ALIGN="BOTTOM" BORDER="0"
|
||||
SRC="img97.png"
|
||||
ALT="$I$"> gets assigned a consecutive chunk of <IMG
|
||||
WIDTH="60" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
|
||||
SRC="img98.png"
|
||||
ALT="$N_I=nl$"> global
|
||||
indices.
|
||||
</DD>
|
||||
<DT><STRONG>repl</STRONG></DT>
|
||||
<DD>This arguments specifies to replicate all indices on
|
||||
all processes. This is a special purpose data allocation that is
|
||||
useful in the construction of some multilevel preconditioners.
|
||||
</DD>
|
||||
</DL>
|
||||
</LI>
|
||||
<LI>There is no
|
||||
requirement that a given row must be passed in its entirety to a
|
||||
single call to this routine: the buildup of a row may be split into
|
||||
as many calls as desired;
|
||||
<LI>On exit from this routine the descriptor is in the build
|
||||
state.
|
||||
</LI>
|
||||
<LI>Coefficients from different rows may also be mixed up freely
|
||||
in a single call, according to the application needs;
|
||||
<LI>Calling the routine with <code>vg</code> or <code>parts</code> implies that
|
||||
every process will scan the entire index space to figure out the
|
||||
local indices.
|
||||
</LI>
|
||||
<LI>Any coefficients from matrix rows not owned by the calling
|
||||
process are silently ignored;
|
||||
<LI>Overlapped indices are possible with both <code>parts</code> and
|
||||
<code>vl</code> invocations.
|
||||
</LI>
|
||||
<LI>If the descriptor is in the assembled state, then any entries in
|
||||
the sparse matrix that would generate additional communication
|
||||
requirements are ignored;
|
||||
<LI>When the subroutine is invoked with <code>vl</code> in
|
||||
conjunction with <code>globalcheck=.true.</code>, it will perform a scan
|
||||
of the index space to search for overlap or orphan indices.
|
||||
</LI>
|
||||
<LI>If the matrix is in the update state, any entries in positions
|
||||
that were not present in the original matrix are ignored.
|
||||
<LI>When the subroutine is invoked with <code>vl</code> in
|
||||
conjunction with <code>globalcheck=.false.</code>, no index space scan
|
||||
will take place. Thus it is the responsibility of the user to make
|
||||
sure that the indices specified in <code>vl</code> have neither orphans nor
|
||||
overlaps; if this assumption fails, results will be
|
||||
unpredictable.
|
||||
</LI>
|
||||
<LI>Orphan and overlap indices are
|
||||
impossible by construction when the subroutine is invoked with
|
||||
<code>nl</code> (alone), or <code>vg</code>.
|
||||
</LI>
|
||||
</OL>
|
||||
|
||||
<P>
|
||||
<HR>
|
||||
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Reference in New Issue
Block a user