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<H2><A NAME="SECTION000811000000000000000">
psb_max -- Global maximum</A>
</H2>
<P>
<PRE>
call psb_max(icontxt, dat, root)
</PRE>
<P>
This subroutine implements a maximum valuereduction
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 or real 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 maximum, or <IMG
WIDTH="24" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
SRC="img76.png"
ALT="$-1$"> 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
$-1<= root <= np-1$
-->
<IMG
WIDTH="166" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
SRC="img129.png"
ALT="$-1&lt;= root &lt;= np-1$">, 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>in</B>.
<BR>
Specified as: an integer or real 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>
<FONT SIZE="+1"><B>Notes</B></FONT>
<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>
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