You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
369 lines
10 KiB
HTML
369 lines
10 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
|
|
|
|
<!--Converted with LaTeX2HTML 2002-2-1 (1.71)
|
|
original version by: Nikos Drakos, CBLU, University of Leeds
|
|
* revised and updated by: Marcus Hennecke, Ross Moore, Herb Swan
|
|
* with significant contributions from:
|
|
Jens Lippmann, Marek Rouchal, Martin Wilck and others -->
|
|
<HTML>
|
|
<HEAD>
|
|
<TITLE>psb_cdall -- Allocates a communication descriptor</TITLE>
|
|
<META NAME="description" CONTENT="psb_cdall -- Allocates a communication descriptor">
|
|
<META NAME="keywords" CONTENT="userhtml">
|
|
<META NAME="resource-type" CONTENT="document">
|
|
<META NAME="distribution" CONTENT="global">
|
|
|
|
<META NAME="Generator" CONTENT="LaTeX2HTML v2002-2-1">
|
|
<META HTTP-EQUIV="Content-Style-Type" CONTENT="text/css">
|
|
|
|
<LINK REL="STYLESHEET" HREF="userhtml.css">
|
|
|
|
<LINK REL="next" HREF="node44.html">
|
|
<LINK REL="previous" HREF="node42.html">
|
|
<LINK REL="up" HREF="node42.html">
|
|
<LINK REL="next" HREF="node44.html">
|
|
</HEAD>
|
|
|
|
<BODY >
|
|
<!--Navigation Panel-->
|
|
<A NAME="tex2html728"
|
|
HREF="node44.html">
|
|
<IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next"
|
|
SRC="file:/usr/share/latex2html/icons/next.png"></A>
|
|
<A NAME="tex2html724"
|
|
HREF="node42.html">
|
|
<IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up"
|
|
SRC="file:/usr/share/latex2html/icons/up.png"></A>
|
|
<A NAME="tex2html718"
|
|
HREF="node42.html">
|
|
<IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous"
|
|
SRC="file:/usr/share/latex2html/icons/prev.png"></A>
|
|
<A NAME="tex2html726"
|
|
HREF="node1.html">
|
|
<IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents"
|
|
SRC="file:/usr/share/latex2html/icons/contents.png"></A>
|
|
<BR>
|
|
<B> Next:</B> <A NAME="tex2html729"
|
|
HREF="node44.html">psb_cdins Communication</A>
|
|
<B> Up:</B> <A NAME="tex2html725"
|
|
HREF="node42.html">Data management routines</A>
|
|
<B> Previous:</B> <A NAME="tex2html719"
|
|
HREF="node42.html">Data management routines</A>
|
|
<B> <A NAME="tex2html727"
|
|
HREF="node1.html">Contents</A></B>
|
|
<BR>
|
|
<BR>
|
|
<!--End of Navigation Panel-->
|
|
|
|
<H2><A NAME="SECTION00071000000000000000">
|
|
psb_cdall -- Allocates a communication descriptor</A>
|
|
</H2>
|
|
|
|
<P>
|
|
<PRE>
|
|
call psb_cdall(icontxt, desc_a, info,mg=mg,parts=parts)
|
|
call psb_cdall(icontxt, desc_a, info,vg=vg,flag=flag)
|
|
call psb_cdall(icontxt, desc_a, info,vl=vl)
|
|
call psb_cdall(icontxt, desc_a, info,nl=nl)
|
|
call psb_cdall(icontxt, desc_a, info,mg=mg,repl=.true.)
|
|
</PRE>
|
|
|
|
<P>
|
|
This subroutine initializes the communication descriptor associated
|
|
with an index space. Exactly 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 specific initialization strategy:
|
|
<DL>
|
|
<DT><STRONG><B>On Entry </B></STRONG></DT>
|
|
<DD>
|
|
</DD>
|
|
<DT><STRONG>Type:</STRONG></DT>
|
|
<DD>Synchronous.
|
|
</DD>
|
|
<DT><STRONG>icontxt</STRONG></DT>
|
|
<DD>the communication context.
|
|
<BR>
|
|
Scope:<B>global</B>.
|
|
<BR>
|
|
Type:<B>required</B>.
|
|
<BR>
|
|
Intent: <B>in</B>.
|
|
<BR>
|
|
Specified as: an integer value.
|
|
</DD>
|
|
<DT><STRONG>vg</STRONG></DT>
|
|
<DD>Data allocation: each index <!-- MATH
|
|
$i\in \{1\dots mg\}$
|
|
-->
|
|
<IMG
|
|
WIDTH="98" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
|
|
SRC="img82.png"
|
|
ALT="$i\in \{1\dots mg\}$"> is allocated
|
|
to process <IMG
|
|
WIDTH="39" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
|
|
SRC="img83.png"
|
|
ALT="$vg(i)$">.
|
|
Scope:<B>global</B>.
|
|
<BR>
|
|
Type:<B>optional</B>.
|
|
<BR>
|
|
Intent: <B>in</B>.
|
|
<BR>
|
|
Specified as: an integer array.
|
|
</DD>
|
|
<DT><STRONG>flag</STRONG></DT>
|
|
<DD>Specifies whether entries in <IMG
|
|
WIDTH="20" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
|
|
SRC="img84.png"
|
|
ALT="$vg$"> are zero- or one-based.
|
|
Scope:<B>global</B>.
|
|
<BR>
|
|
Type:<B>optional</B>.
|
|
<BR>
|
|
Intent: <B>in</B>.
|
|
<BR>
|
|
Specified as: an integer value <IMG
|
|
WIDTH="27" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
|
|
SRC="img85.png"
|
|
ALT="$0,1$">, default <IMG
|
|
WIDTH="11" HEIGHT="13" ALIGN="BOTTOM" BORDER="0"
|
|
SRC="img86.png"
|
|
ALT="$0$">.
|
|
|
|
<P>
|
|
</DD>
|
|
<DT><STRONG>mg</STRONG></DT>
|
|
<DD>the (global) number of rows of the problem.
|
|
<BR>
|
|
Scope:<B>global</B>.
|
|
<BR>
|
|
Type:<B>optional</B>.
|
|
<BR>
|
|
Intent: <B>in</B>.
|
|
<BR>
|
|
Specified as: an integer value. It is required if <code>parts</code> or
|
|
<code>repl</code> is specified.
|
|
</DD>
|
|
<DT><STRONG>parts</STRONG></DT>
|
|
<DD>the subroutine that defines the partitioning scheme.
|
|
<BR>
|
|
Scope:<B>global</B>.
|
|
<BR>
|
|
Type:<B>required</B>.
|
|
<BR>
|
|
Specified as: a subroutine.
|
|
</DD>
|
|
<DT><STRONG>vl</STRONG></DT>
|
|
<DD>Data allocation: the set of global indices belonging to the
|
|
calling process.
|
|
Scope:<B>local</B>.
|
|
<BR>
|
|
Type:<B>optional</B>.
|
|
<BR>
|
|
Intent: <B>in</B>.
|
|
<BR>
|
|
Specified as: an integer array.
|
|
</DD>
|
|
<DT><STRONG>nl</STRONG></DT>
|
|
<DD>Data allocation: in a generalized block-row distribution the
|
|
number of indices belonging to the current process.
|
|
Scope:<B>local</B>.
|
|
<BR>
|
|
Type:<B>optional</B>.
|
|
<BR>
|
|
Intent: <B>in</B>.
|
|
<BR>
|
|
Specified as: an integer value.
|
|
</DD>
|
|
<DT><STRONG>repl</STRONG></DT>
|
|
<DD>Data allocation: build a replicated index space (i.e. all
|
|
processes own all indices).
|
|
Scope:<B>global</B>.
|
|
<BR>
|
|
Type:<B>optional</B>.
|
|
<BR>
|
|
Intent: <B>in</B>.
|
|
<BR>
|
|
Specified as: the logical value <code>.true.</code>
|
|
</DD>
|
|
</DL>
|
|
|
|
<P>
|
|
<DL>
|
|
<DT><STRONG><B>On Return</B></STRONG></DT>
|
|
<DD>
|
|
</DD>
|
|
<DT><STRONG>desc_a</STRONG></DT>
|
|
<DD>the communication descriptor.
|
|
<BR>
|
|
Scope:<B>local</B>.
|
|
<BR>
|
|
Type:<B>required</B>.
|
|
<BR>
|
|
Intent: <B>out</B>.
|
|
<BR>
|
|
Specified as: a structured data of type descdata<TT>psb_desc_type</TT>.
|
|
</DD>
|
|
<DT><STRONG>info</STRONG></DT>
|
|
<DD>Error code.
|
|
<BR>
|
|
Scope: <B>local</B>
|
|
<BR>
|
|
Type: <B>required</B>
|
|
<BR>
|
|
Intent: <B>out</B>.
|
|
<BR>
|
|
An integer value; 0 means no error has been detected.
|
|
</DD>
|
|
</DL>
|
|
|
|
<P>
|
|
<FONT SIZE="+1"><B>Notes</B></FONT>
|
|
|
|
<OL>
|
|
<LI>Exactly one of the optional arguments <code>parts</code>, <code>vg</code>,
|
|
<code>vl</code>, <code>nl</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 containint 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="106" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
|
|
SRC="img87.png"
|
|
ALT="$0\le pv(i) < np$">; if <IMG
|
|
WIDTH="51" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
|
|
SRC="img88.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; the size of the index space is
|
|
equal to the size of <code>vg</code>, and each index <IMG
|
|
WIDTH="10" HEIGHT="17" ALIGN="BOTTOM" BORDER="0"
|
|
SRC="img3.png"
|
|
ALT="$i$"> is assigned to
|
|
the process <IMG
|
|
WIDTH="39" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
|
|
SRC="img83.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="img89.png"
|
|
ALT="$(0\dots np-1)$">
|
|
or <IMG
|
|
WIDTH="65" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
|
|
SRC="img90.png"
|
|
ALT="$(1\dots np)$"> according to the value of <code>flag</code>.
|
|
</DD>
|
|
<DT><STRONG>vl</STRONG></DT>
|
|
<DD>In this case we are specifying the list of indices assigned
|
|
to the current process; thus, the global problem size <IMG
|
|
WIDTH="27" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
|
|
SRC="img91.png"
|
|
ALT="$mg$"> is given by
|
|
the sum of the sizes of the individual vectors <code>vl</code> specified
|
|
on the calling processes. The subroutine will check that each entry
|
|
in the global index space <IMG
|
|
WIDTH="70" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
|
|
SRC="img92.png"
|
|
ALT="$(1\dots mg)$"> is specified exactly once.
|
|
</DD>
|
|
<DT><STRONG>nl</STRONG></DT>
|
|
<DD>In this case we are implying a generalized row-block
|
|
distribution in which each process <IMG
|
|
WIDTH="13" HEIGHT="14" ALIGN="BOTTOM" BORDER="0"
|
|
SRC="img93.png"
|
|
ALT="$I$"> gets assigned a consecutive
|
|
chunk of <IMG
|
|
WIDTH="59" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
|
|
SRC="img94.png"
|
|
ALT="$N_I=nl$"> global indices.
|
|
</DD>
|
|
<DT><STRONG>repl</STRONG></DT>
|
|
<DD>In this case we are asking 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>On exit from this routine the descriptor is in the build state
|
|
</LI>
|
|
</OL>
|
|
|
|
<P>
|
|
<HR>
|
|
<!--Navigation Panel-->
|
|
<A NAME="tex2html728"
|
|
HREF="node44.html">
|
|
<IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next"
|
|
SRC="file:/usr/share/latex2html/icons/next.png"></A>
|
|
<A NAME="tex2html724"
|
|
HREF="node42.html">
|
|
<IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up"
|
|
SRC="file:/usr/share/latex2html/icons/up.png"></A>
|
|
<A NAME="tex2html718"
|
|
HREF="node42.html">
|
|
<IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous"
|
|
SRC="file:/usr/share/latex2html/icons/prev.png"></A>
|
|
<A NAME="tex2html726"
|
|
HREF="node1.html">
|
|
<IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents"
|
|
SRC="file:/usr/share/latex2html/icons/contents.png"></A>
|
|
<BR>
|
|
<B> Next:</B> <A NAME="tex2html729"
|
|
HREF="node44.html">psb_cdins Communication</A>
|
|
<B> Up:</B> <A NAME="tex2html725"
|
|
HREF="node42.html">Data management routines</A>
|
|
<B> Previous:</B> <A NAME="tex2html719"
|
|
HREF="node42.html">Data management routines</A>
|
|
<B> <A NAME="tex2html727"
|
|
HREF="node1.html">Contents</A></B>
|
|
<!--End of Navigation Panel-->
|
|
|
|
</BODY>
|
|
</HTML>
|