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<H2><A NAME="SECTION000810000000000000000">
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psb_sum -- Global sum</A>
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</H2>
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<P>
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<PRE>
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call psb_sum(icontxt, dat, root)
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</PRE>
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<P>
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This subroutine implements a sum reduction operation based on the
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underlying communication library.
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<DL>
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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><B>On Entry </B></STRONG></DT>
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<DD>
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</DD>
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<DT><STRONG>icontxt</STRONG></DT>
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<DD>the communication context identifying the virtual
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parallel machine.
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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 variable.
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</DD>
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<DT><STRONG>dat</STRONG></DT>
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<DD>The local contribution to the global sum.
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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>inout</B>.
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<BR>
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Specified as: an integer, real or complex variable, which may be a
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scalar, or a rank 1 or 2 array. Type, kind, rank and size must agree on all processes.
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</DD>
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<DT><STRONG>root</STRONG></DT>
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<DD>Process to hold the final sum, or <IMG
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WIDTH="25" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img83.png"
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ALT="$-1$"> to make it available
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on all processes.
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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 <!-- MATH
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$-1<= root <= np-1$
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-->
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<IMG
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WIDTH="165" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img128.png"
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ALT="$-1<= root <= np-1$">, default -1. </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>dat</STRONG></DT>
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<DD>On destination process(es), the result of the sum operation.
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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>inout</B>.
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<BR>
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Specified as: an integer, real or complex variable, which may be a
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scalar, or a rank 1 or 2 array.
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<BR>
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Type, kind, rank and size must agree on all processes.
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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>The <code>dat</code> argument is both input and output, and its
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value may be changed even on processes different from the final
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result destination.
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</LI>
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<LI>The <code>dat</code> argument may also be a long integer scalar.
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