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HREF="node1.html">Contents</A></B>
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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_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.])
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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><B>On Entry </B></STRONG></DT>
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<DD>
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</DD>
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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>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.
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</DD>
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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="98" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
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SRC="img86.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="39" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
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SRC="img87.png"
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ALT="$vg(i)$">.
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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 array.
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</DD>
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<DT><STRONG>flag</STRONG></DT>
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<DD>Specifies whether entries in <IMG
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SRC="img88.png"
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ALT="$vg$"> are zero- or one-based.
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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 <IMG
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WIDTH="27" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img89.png"
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ALT="$0,1$">, default <IMG
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ALT="$0$">.
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<P>
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</DD>
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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>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. 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>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>global</B>.
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<BR>
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Type:<B>required</B>.
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<BR>
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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="img91.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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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 (i.e. all
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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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</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_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>out</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>One of the optional arguments <code>parts</code>, <code>vg</code>,
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<code>vl</code>, <code>nl</code> or <code>repl</code> must be specified, thereby choosing the
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initialization strategy as follows:
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<DL>
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<DT><STRONG>parts</STRONG></DT>
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<DD>In this case we have a subroutine specifying the mapping
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between global indices and process/local index pairs. If this
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optional argument is specified, then it is mandatory to
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specify the argument <code>mg</code> as well.
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The subroutine must conform to the following interface:
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<PRE>
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interface
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subroutine psb_parts(glob_index,mg,np,pv,nv)
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integer, intent (in) :: glob_index,np,mg
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integer, intent (out) :: nv, pv(*)
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end subroutine psb_parts
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end interface
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</PRE>
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The input arguments are:
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<DL>
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<DT><STRONG>glob_index</STRONG></DT>
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<DD>The global index to be mapped;
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</DD>
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<DT><STRONG>np</STRONG></DT>
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<DD>The number of processes in the mapping;
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</DD>
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<DT><STRONG>mg</STRONG></DT>
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<DD>The total number of global rows in the mapping;
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</DD>
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</DL>
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The output arguments are:
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<DL>
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<DT><STRONG>nv</STRONG></DT>
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<DD>The number of entries in <code>pv</code>;
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</DD>
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<DT><STRONG>pv</STRONG></DT>
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<DD>A vector containing the indices of the processes to
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which the global index should be assigend; each entry must satisfy
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<!-- MATH
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$0\le pv(i) < np$
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-->
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<IMG
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WIDTH="107" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
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SRC="img92.png"
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ALT="$0\le pv(i) < np$">; if <IMG
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WIDTH="51" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img93.png"
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ALT="$nv>1$"> we have an index assigned to multiple
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processes, i.e. we have an overlap among the subdomains.
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</DD>
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</DL>
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</DD>
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<DT><STRONG>vg</STRONG></DT>
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<DD>In this case the association between an index and a process
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is specified via an integer vector <code>vg(1:mg)</code>;
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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="98" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
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SRC="img86.png"
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ALT="$i\in \{1\dots mg\}$"> is assigned to process <IMG
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WIDTH="39" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
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SRC="img87.png"
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ALT="$vg(i)$">.
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The vector <code>vg</code> must be identical on all
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calling processes; its entries may have the ranges <IMG
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WIDTH="94" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
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SRC="img94.png"
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ALT="$(0\dots np-1)$">
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or <IMG
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WIDTH="65" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
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SRC="img95.png"
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ALT="$(1\dots np)$"> according to the value of <code>flag</code>.
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The size <IMG
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WIDTH="27" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img96.png"
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ALT="$mg$"> may be specified via the optional argument <code>mg</code>;
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the default is to use the entire vector <code>vg</code>, thus having
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<code>mg=size(vg)</code>.
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</DD>
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<DT><STRONG>vl</STRONG></DT>
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<DD>In this case we are specifying the list of indices
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<code>vl(1:nl)</code> assigned to the current process; thus, the global
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problem size <IMG
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WIDTH="27" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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|
SRC="img96.png"
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|
ALT="$mg$"> is given by
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|
the range of the aggregate of the individual vectors <code>vl</code> specified
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|
|
in the calling processes. The size may be specified via the optional
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|
|
argument <code>nl</code>; the default is to use the entire vector <code>vl</code>, thus having
|
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|
|
<code>nl=size(vl)</code>.
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If <code>globalcheck=.true.</code> the subroutine will check how many
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|
times each entry in the global index space <IMG
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WIDTH="70" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
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SRC="img97.png"
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|
ALT="$(1\dots mg)$"> is
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|
specified in the input lists <code>vl</code>, thus allowing for the
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|
|
presence of overlap in the input, and checking for ``orphan''
|
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|
|
indices. If <code>globalcheck=.false.</code>, the subroutine will not
|
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|
|
check for overlap, and may be significantly faster, but the user
|
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|
|
is implicitly guaranteeing that there are neither orphan nor
|
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|
|
|
overlap indices.
|
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|
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|
</DD>
|
|
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|
<DT><STRONG>nl</STRONG></DT>
|
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|
|
<DD>If this argument is specified alone (i.e. without <code>vl</code>)
|
|
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|
|
the result is a generalized row-block distribution in which each
|
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|
|
process <IMG
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|
WIDTH="13" HEIGHT="14" ALIGN="BOTTOM" BORDER="0"
|
|
|
|
|
SRC="img98.png"
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|
ALT="$I$"> gets assigned a consecutive chunk of <IMG
|
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|
WIDTH="60" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
|
|
|
|
|
SRC="img99.png"
|
|
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|
|
ALT="$N_I=nl$"> global
|
|
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|
|
indices.
|
|
|
|
|
</DD>
|
|
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|
|
<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.
|
|
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|
|
</DD>
|
|
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|
|
</DL>
|
|
|
|
|
</LI>
|
|
|
|
|
<LI>On exit from this routine the descriptor is in the build
|
|
|
|
|
state.
|
|
|
|
|
</LI>
|
|
|
|
|
<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>Overlapped indices are possible with both <code>parts</code> and
|
|
|
|
|
<code>vl</code> invocations.
|
|
|
|
|
</LI>
|
|
|
|
|
<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>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>
|
|
|
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