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.
177 lines
4.8 KiB
HTML
177 lines
4.8 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
|
|
|
|
<!--Converted with LaTeX2HTML 2018 (Released Feb 1, 2018) -->
|
|
<HTML>
|
|
<HEAD>
|
|
<TITLE>psb_amx -- Global maximum absolute value</TITLE>
|
|
<META NAME="description" CONTENT="psb_amx -- Global maximum absolute value">
|
|
<META NAME="keywords" CONTENT="userhtml">
|
|
<META NAME="resource-type" CONTENT="document">
|
|
<META NAME="distribution" CONTENT="global">
|
|
|
|
<META NAME="Generator" CONTENT="LaTeX2HTML v2018">
|
|
<META HTTP-EQUIV="Content-Style-Type" CONTENT="text/css">
|
|
|
|
<LINK REL="STYLESHEET" HREF="userhtml.css">
|
|
|
|
<LINK REL="next" HREF="node113.html">
|
|
<LINK REL="previous" HREF="node111.html">
|
|
<LINK REL="up" HREF="node99.html">
|
|
<LINK REL="next" HREF="node113.html">
|
|
</HEAD>
|
|
|
|
<BODY >
|
|
|
|
<DIV CLASS="navigation"><!--Navigation Panel-->
|
|
<A NAME="tex2html1661"
|
|
HREF="node113.html">
|
|
<IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="next.png"></A>
|
|
<A NAME="tex2html1657"
|
|
HREF="node99.html">
|
|
<IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="up.png"></A>
|
|
<A NAME="tex2html1651"
|
|
HREF="node111.html">
|
|
<IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="prev.png"></A>
|
|
<A NAME="tex2html1659"
|
|
HREF="node1.html">
|
|
<IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="contents.png"></A>
|
|
<BR>
|
|
<B> Next:</B> <A NAME="tex2html1662"
|
|
HREF="node113.html">psb_amn Global</A>
|
|
<B> Up:</B> <A NAME="tex2html1658"
|
|
HREF="node99.html">Parallel environment routines</A>
|
|
<B> Previous:</B> <A NAME="tex2html1652"
|
|
HREF="node111.html">psb_min Global</A>
|
|
<B> <A NAME="tex2html1660"
|
|
HREF="node1.html">Contents</A></B>
|
|
<BR>
|
|
<BR></DIV>
|
|
<!--End of Navigation Panel-->
|
|
|
|
<H2><A NAME="SECTION000813000000000000000">
|
|
psb_amx -- Global maximum absolute value</A>
|
|
</H2>
|
|
|
|
<P>
|
|
<PRE>
|
|
call psb_amx(icontxt, dat, root)
|
|
</PRE>
|
|
|
|
<P>
|
|
This subroutine implements a maximum absolute value reduction
|
|
operation based on the underlying communication library.
|
|
<DL>
|
|
<DT><STRONG>Type:</STRONG></DT>
|
|
<DD>Synchronous.
|
|
</DD>
|
|
<DT><STRONG><B>On Entry </B></STRONG></DT>
|
|
<DD>
|
|
</DD>
|
|
<DT><STRONG>icontxt</STRONG></DT>
|
|
<DD>the communication context identifying the virtual
|
|
parallel machine.
|
|
<BR>
|
|
Scope: <B>global</B>.
|
|
<BR>
|
|
Type: <B>required</B>.
|
|
<BR>
|
|
Intent: <B>in</B>.
|
|
<BR>
|
|
Specified as: an integer variable.
|
|
</DD>
|
|
<DT><STRONG>dat</STRONG></DT>
|
|
<DD>The local contribution to the global maximum.
|
|
<BR>
|
|
Scope: <B>local</B>.
|
|
<BR>
|
|
Type: <B>required</B>.
|
|
<BR>
|
|
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. Type, kind, rank and size must agree on all processes.
|
|
</DD>
|
|
<DT><STRONG>root</STRONG></DT>
|
|
<DD>Process to hold the final value, or <SPAN CLASS="MATH"><IMG
|
|
WIDTH="24" HEIGHT="29" 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>optional</B>.
|
|
<BR>
|
|
Intent: <B>in</B>.
|
|
<BR>
|
|
Specified as: an integer value <!-- MATH
|
|
$-1<= root <= np-1$
|
|
-->
|
|
<SPAN CLASS="MATH"><IMG
|
|
WIDTH="165" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
|
|
SRC="img136.png"
|
|
ALT="$-1<= root <= np-1$"></SPAN>, default -1.
|
|
<BR></DD>
|
|
</DL>
|
|
|
|
<P>
|
|
<DL>
|
|
<DT><STRONG><B>On Return</B></STRONG></DT>
|
|
<DD>
|
|
</DD>
|
|
<DT><STRONG>dat</STRONG></DT>
|
|
<DD>On destination process(es), the result of the maximum operation.
|
|
<BR>
|
|
Scope: <B>global</B>.
|
|
<BR>
|
|
Type: <B>required</B>.
|
|
<BR>
|
|
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. Type, kind, rank and size must agree on all processes.
|
|
</DD>
|
|
</DL>
|
|
|
|
<P>
|
|
<BIG CLASS="LARGE"><B>Notes</B></BIG>
|
|
|
|
<OL>
|
|
<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>
|
|
<LI>The <code>dat</code> argument may also be a long integer scalar.
|
|
</LI>
|
|
</OL>
|
|
|
|
<P>
|
|
|
|
<DIV CLASS="navigation"><HR>
|
|
<!--Navigation Panel-->
|
|
<A NAME="tex2html1661"
|
|
HREF="node113.html">
|
|
<IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="next.png"></A>
|
|
<A NAME="tex2html1657"
|
|
HREF="node99.html">
|
|
<IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="up.png"></A>
|
|
<A NAME="tex2html1651"
|
|
HREF="node111.html">
|
|
<IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="prev.png"></A>
|
|
<A NAME="tex2html1659"
|
|
HREF="node1.html">
|
|
<IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="contents.png"></A>
|
|
<BR>
|
|
<B> Next:</B> <A NAME="tex2html1662"
|
|
HREF="node113.html">psb_amn Global</A>
|
|
<B> Up:</B> <A NAME="tex2html1658"
|
|
HREF="node99.html">Parallel environment routines</A>
|
|
<B> Previous:</B> <A NAME="tex2html1652"
|
|
HREF="node111.html">psb_min Global</A>
|
|
<B> <A NAME="tex2html1660"
|
|
HREF="node1.html">Contents</A></B> </DIV>
|
|
<!--End of Navigation Panel-->
|
|
|
|
</BODY>
|
|
</HTML>
|