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This commit is contained in:
Salvatore Filippone
+53
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@@ -7,8 +7,8 @@ original version by: Nikos Drakos, CBLU, University of Leeds
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Jens Lippmann, Marek Rouchal, Martin Wilck and others -->
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<HTML>
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<HEAD>
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<TITLE>psb_sum -- Global sum</TITLE>
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<META NAME="description" CONTENT="psb_sum -- Global sum">
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<TITLE>psb_exit -- Exit from PSBLAS parallel environment</TITLE>
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<META NAME="description" CONTENT="psb_exit -- Exit from PSBLAS parallel environment">
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<META NAME="keywords" CONTENT="userhtml">
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<META NAME="resource-type" CONTENT="document">
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<META NAME="distribution" CONTENT="global">
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@@ -20,49 +20,50 @@ original version by: Nikos Drakos, CBLU, University of Leeds
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<BR>
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<B> Next:</B> <A NAME="tex2html1420"
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HREF="node97.html">psb_max Global</A>
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<B> Up:</B> <A NAME="tex2html1416"
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HREF="node86.html">Parallel environment routines</A>
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<B> Previous:</B> <A NAME="tex2html1410"
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HREF="node95.html">psb_bcast Broadcast</A>
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<B> <A NAME="tex2html1418"
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<B> Next:</B> <A NAME="tex2html1441"
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HREF="node97.html">psb_get_mpicomm Get</A>
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<B> Up:</B> <A NAME="tex2html1437"
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HREF="node93.html">Parallel environment routines</A>
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<B> Previous:</B> <A NAME="tex2html1431"
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HREF="node95.html">psb_info Return</A>
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<B> <A NAME="tex2html1439"
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HREF="node1.html">Contents</A></B>
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<BR>
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<BR>
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<!--End of Navigation Panel-->
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<H2><A NAME="SECTION000810000000000000000">
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psb_sum -- Global sum</A>
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<H2><A NAME="SECTION00083000000000000000">
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psb_exit -- Exit from PSBLAS parallel
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environment</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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call psb_exit(icontxt)
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call psb_exit(icontxt,close)
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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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This subroutine exits from the PSBLAS parallel virtual machine.
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<DL>
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<DT><STRONG>Type:</STRONG></DT>
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<DD>Synchronous.
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@@ -82,24 +83,9 @@ 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="24" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img79.png"
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ALT="$-1$"> to make it available
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on all processes.
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<DT><STRONG>close</STRONG></DT>
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<DD>Whether to close all data structures related to the
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virtual parallel machine, besides those associated with icontxt.
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<BR>
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Scope: <B>global</B>.
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<BR>
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@@ -107,33 +93,7 @@ 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="img133.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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Specified as: a logical variable, default value: true.
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</DD>
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</DL>
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@@ -141,37 +101,49 @@ Type, kind, rank and size must agree on all processes.
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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>This routine may be called even if a previous call to
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<code>psb_info</code> has returned with <IMG
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WIDTH="74" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
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SRC="img129.png"
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ALT="$iam=-1$">; indeed, it it is the only
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routine that may be called with argument <code>icontxt</code> in this
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situation.
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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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<LI>A call to this routine with <code>close=.true.</code> implies a call
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to <code>MPI_Finalize</code>, after which no parallel routine may be called.
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</LI>
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<LI>If the user whishes to use multiple communication contexts in the
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same program, or to enter and exit multiple times into the parallel
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environment, this routine may be called to
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selectively close the contexts with <code>close=.false.</code>, while on
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the last call it should be called with <code>close=.true.</code> to
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shutdown in a clean way the entire parallel environment.
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</LI>
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</OL>
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<P>
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<HR>
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HREF="node97.html">psb_get_mpicomm Get</A>
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HREF="node93.html">Parallel environment routines</A>
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