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Updated description of DOT and friends to account for optional GLOBAL

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Salvatore Filippone
2018-04-20 15:57:26 +01:00
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<!--Converted with LaTeX2HTML 2017.2 (Released Jan 23, 2017) -->
<HTML>
<HEAD>
<TITLE>psb_snd -- Send data</TITLE>
<META NAME="description" CONTENT="psb_snd -- Send data">
<TITLE>psb_nrm2 -- Global 2-norm reduction</TITLE>
<META NAME="description" CONTENT="psb_nrm2 -- Global 2-norm reduction">
<META NAME="keywords" CONTENT="userhtml">
<META NAME="resource-type" CONTENT="document">
<META NAME="distribution" CONTENT="global">
@@ -23,45 +23,46 @@
<BODY >
<DIV CLASS="navigation"><!--Navigation Panel-->
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<H2><A NAME="SECTION000815000000000000000">
psb_snd -- Send data</A>
psb_nrm2 -- Global 2-norm reduction</A>
</H2>
<P>
<PRE>
call psb_snd(icontxt, dat, dst, m)
call psb_nrm2(icontxt, dat, root)
</PRE>
<P>
This subroutine sends a packet of data to a destination.
This subroutine implements a 2-norm value reduction
operation based on the underlying communication library.
<DL>
<DT><STRONG>Type:</STRONG></DT>
<DD>Synchronous: see usage notes.
<DD>Synchronous.
</DD>
<DT><STRONG><B>On Entry </B></STRONG></DT>
<DD>
@@ -79,65 +80,38 @@ Intent: <B>in</B>.
Specified as: an integer variable.
</DD>
<DT><STRONG>dat</STRONG></DT>
<DD>The data to be sent.
<DD>The local contribution to the global minimum.
<BR>
Scope: <B>local</B>.
<BR>
Type: <B>required</B>.
<BR>
Intent: <B>in</B>.
Intent: <B>inout</B>.
<BR>
Specified as: an integer, real or complex variable, which may be a
scalar, or a rank 1 or 2 array, or a character or logical scalar. Type, kind and rank must agree on sender and receiver process; if <SPAN CLASS="MATH"><IMG
WIDTH="18" HEIGHT="14" ALIGN="BOTTOM" BORDER="0"
SRC="img133.png"
ALT="$m$"></SPAN> is
not specified, size must agree as well.
Specified as: a real variable, which may be a
scalar, or a rank 1 array. Kind, rank and size must agree on all processes.
</DD>
<DT><STRONG>dst</STRONG></DT>
<DD>Destination process.
<DT><STRONG>root</STRONG></DT>
<DD>Process to hold the final value, or <SPAN CLASS="MATH"><IMG
WIDTH="24" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
SRC="img82.png"
ALT="$-1$"></SPAN> to make it available
on all processes.
<BR>
Scope: <B>global</B>.
<BR>
Type: <B>required</B>.
Type: <B>optional</B>.
<BR>
Intent: <B>in</B>.
<BR>
Specified as: an integer value <!-- MATH
$0<= dst <= np-1$
$-1<= root <= np-1$
-->
<SPAN CLASS="MATH"><IMG
WIDTH="145" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
SRC="img134.png"
ALT="$0&lt;= dst &lt;= np-1$"></SPAN>.
<BR></DD>
<DT><STRONG>m</STRONG></DT>
<DD>Number of rows.
<BR>
Scope: <B>global</B>.
<BR>
Type: <B>Optional</B>.
<BR>
Intent: <B>in</B>.
<BR>
Specified as: an integer value <!-- MATH
$0<= m <= size(dat,1)$
-->
<SPAN CLASS="MATH"><IMG
WIDTH="172" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
SRC="img135.png"
ALT="$0&lt;= m &lt;= size(dat,1)$"></SPAN>.
<BR>
When <SPAN CLASS="MATH"><IMG
WIDTH="26" HEIGHT="15" ALIGN="BOTTOM" BORDER="0"
WIDTH="165" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
SRC="img136.png"
ALT="$dat$"></SPAN> is a rank 2 array, specifies the number of rows to be sent
independently of the leading dimension <SPAN CLASS="MATH"><IMG
WIDTH="83" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
SRC="img137.png"
ALT="$size(dat,1)$"></SPAN>; must have the
same value on sending and receiving processes.
</DD>
ALT="$-1&lt;= root &lt;= np-1$"></SPAN>, default -1.
<BR></DD>
</DL>
<P>
@@ -145,17 +119,57 @@ same value on sending and receiving processes.
<DT><STRONG><B>On Return</B></STRONG></DT>
<DD>
</DD>
<DT><STRONG>dat</STRONG></DT>
<DD>On destination process(es), the result of the 2-norm reduction.
<BR>
Scope: <B>global</B>.
<BR>
Type: <B>required</B>.
<BR>
Intent: <B>inout</B>.
<BR>
Specified as: a real variable, which may be a
scalar, or a rank 1 array.
<BR>
Kind, rank and size must agree on all processes.
</DD>
</DL>
<P>
<BIG CLASS="LARGE"><B>Notes</B></BIG>
<OL>
<LI>This subroutine implies a synchronization, but only between the
calling process and the destination process <SPAN CLASS="MATH"><IMG
WIDTH="25" HEIGHT="15" ALIGN="BOTTOM" BORDER="0"
<LI>This reduction is appropriate to compute the results of multiple
(local) NRM2 operations at the same time.
</LI>
<LI>Denoting by <SPAN CLASS="MATH"></SPAN> the value of the variable <SPAN CLASS="MATH"><IMG
WIDTH="26" HEIGHT="15" ALIGN="BOTTOM" BORDER="0"
SRC="img138.png"
ALT="$dst$"></SPAN>.
ALT="$dat$"></SPAN> on process
<SPAN CLASS="MATH"><IMG
WIDTH="9" HEIGHT="17" ALIGN="BOTTOM" BORDER="0"
SRC="img4.png"
ALT="$i$"></SPAN>, the output <SPAN CLASS="MATH"><IMG
WIDTH="26" HEIGHT="14" ALIGN="BOTTOM" BORDER="0"
SRC="img29.png"
ALT="$res$"></SPAN> is equivalent to the computation of
<BR><P></P>
<DIV ALIGN="CENTER" CLASS="mathdisplay">
<!-- MATH
\begin{displaymath}
res = \sqrt{\sum_i dat_i^2},
\end{displaymath}
-->
</DIV>
<BR CLEAR="ALL">
<P></P>
with care taken to avoid unnecessary overflow.
</LI>
<LI>The <code>dat</code> argument is both input and output, and its
value may be changed even on processes different from the final
result destination.
</LI>
</OL>
@@ -163,26 +177,26 @@ same value on sending and receiving processes.
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