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Added entrywise inversion and documentation for vec-vec operation

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2019-11-21 13:56:22 +01:00
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<TITLE>psb_cdbldext -- Build an extended communication descriptor</TITLE>
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<TITLE>psb_cdasb -- Communication descriptor assembly routine</TITLE>
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<H2><A NAME="SECTION00076000000000000000">
psb_cdbldext -- Build an extended communication
descriptor</A>
<H2><A NAME="SECTION00073000000000000000">
psb_cdasb -- Communication descriptor assembly
routine</A>
</H2>
<P>
<PRE>
call psb_cdbldext(a,desc_a,nl,desc_out, info, extype)
call psb_cdasb(desc_a, info [, mold])
</PRE>
<P>
This subroutine builds an extended communication descriptor, based on
the input descriptor <code>desc_a</code> and on the stencil specified
through the input sparse matrix <code>a</code>.
<DL>
<DT><STRONG>Type:</STRONG></DT>
<DD>Synchronous.
@@ -69,16 +66,6 @@ through the input sparse matrix <code>a</code>.
<DT><STRONG><B>On Entry</B></STRONG></DT>
<DD>
</DD>
<DT><STRONG>a</STRONG></DT>
<DD>A sparse matrix
Scope:<B>local</B>.
<BR>
Type:<B>required</B>.
<BR>
Intent: <B>in</B>.
<BR>
Specified as: a structured data type.
</DD>
<DT><STRONG>desc_a</STRONG></DT>
<DD>the communication descriptor.
<BR>
@@ -86,37 +73,20 @@ Scope:<B>local</B>.
<BR>
Type:<B>required</B>.
<BR>
Intent: <B>in</B>.
Intent: <B>inout</B>.
<BR>
Specified as: a structured data of type spdata<TT>psb_Tspmat_type</TT>.
Specified as: a structured data of type descdata<TT>psb_desc_type</TT>.
</DD>
<DT><STRONG>nl</STRONG></DT>
<DD>the number of additional layers desired.
<DT><STRONG>mold</STRONG></DT>
<DD>The desired dynamic type for the internal index storage.
<BR>
Scope:<B>global</B>.
Scope: <B>local</B>.
<BR>
Type:<B>required</B>.
Type: <B>optional</B>.
<BR>
Intent: <B>in</B>.
<BR>
Specified as: an integer value <SPAN CLASS="MATH"><IMG
WIDTH="47" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
SRC="img106.png"
ALT="$nl\ge 0$"></SPAN>.
</DD>
<DT><STRONG>extype</STRONG></DT>
<DD>the kind of estension required.
<BR>
Scope:<B>global</B>.
<BR>
Type:<B>optional </B>.
<BR>
Intent: <B>in</B>.
<BR>
Specified as: an integer value
<code>psb_ovt_xhal_</code>, <code>psb_ovt_asov_</code>, default: <code>psb_ovt_xhal_</code>
<P>
Specified as: a object of type derived from (integer) vbasedata<TT>psb_T_base_vect_type</TT>.
</DD>
</DL>
@@ -125,8 +95,8 @@ Specified as: an integer value
<DT><STRONG><B>On Return</B></STRONG></DT>
<DD>
</DD>
<DT><STRONG>desc_out</STRONG></DT>
<DD>the extended communication descriptor.
<DT><STRONG>desc_a</STRONG></DT>
<DD>the communication descriptor.
<BR>
Scope:<B>local</B>.
<BR>
@@ -148,51 +118,16 @@ Intent: <B>out</B>.
An integer value; 0 means no error has been detected.
</DD>
</DL>
<P>
<BIG CLASS="LARGE"><B>Notes</B></BIG>
<OL>
<LI>Specifying <code>psb_ovt_xhal_</code> for the <code>extype</code> argument
the user will obtain a descriptor for a domain partition in which
the additional layers are fetched as part of an (extended) halo;
however the index-to-process mapping is identical to that of the
base descriptor;
</LI>
<LI>Specifying <code>psb_ovt_asov_</code> for the <code>extype</code> argument
the user will obtain a descriptor with an overlapped decomposition:
the additional layer is aggregated to the local subdomain (and thus
is an overlap), and a new halo extending beyond the last additional
layer is formed.
<LI>On exit from this routine the descriptor is in the assembled
state.
</LI>
</OL>
<P>
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