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Document DESC%CNV method and MOLD arguments to CDASB and PREC%BUILD
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Salvatore Filippone
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original version by: Nikos Drakos, CBLU, University of Leeds
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* revised and updated by: Marcus Hennecke, Ross Moore, Herb Swan
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* with significant contributions from:
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Jens Lippmann, Marek Rouchal, Martin Wilck and others -->
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<!--Converted with LaTeX2HTML 2017.2 (Released Jan 23, 2017) -->
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<HTML>
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<HEAD>
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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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<TITLE>psb_info -- Return information about PSBLAS parallel environment</TITLE>
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<META NAME="description" CONTENT="psb_info -- Return information about PSBLAS parallel environment">
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HREF="node102.html">psb_get_mpicomm Get</A>
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HREF="node98.html">Parallel environment routines</A>
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HREF="node102.html">psb_exit Exit</A>
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HREF="node99.html">Parallel environment routines</A>
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HREF="node100.html">psb_init Initializes</A>
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HREF="node1.html">Contents</A></B>
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<!--End of Navigation Panel-->
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<H2><A NAME="SECTION00083000000000000000">
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psb_exit -- Exit from PSBLAS parallel
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<H2><A NAME="SECTION00082000000000000000">
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psb_info -- Return information about 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_exit(icontxt)
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call psb_exit(icontxt,close)
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call psb_info(icontxt, iam, np)
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</PRE>
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<P>
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This subroutine exits from the PSBLAS parallel virtual machine.
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This subroutine returns information about the PSBLAS parallel environment, defining
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a virtual parallel 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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<DD>Asynchronous.
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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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@@ -83,69 +80,67 @@ 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>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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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: a logical variable, default value: true.
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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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<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>iam</STRONG></DT>
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<DD>Identifier of current process in the PSBLAS virtual parallel machine.
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<BR>
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Scope: <B>local</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>out</B>.
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<BR>
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Specified as: an integer value. <!-- MATH
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$-1 \le iam \le np-1$
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-->
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<SPAN CLASS="MATH"><IMG
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WIDTH="139" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
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SRC="img126.png"
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ALT="$-1 \le iam \le np-1$"></SPAN> </DD>
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<DT><STRONG>np</STRONG></DT>
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<DD>Number of processes in the PSBLAS virtual 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>out</B>.
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<BR>
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Specified as: an integer variable. </DD>
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</DL>
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<P>
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<BIG CLASS="LARGE"><B>Notes</B></BIG>
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<OL>
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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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<LI>For processes in the virtual parallel machine the identifier
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will satisfy <!-- MATH
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$0 \le iam \le np-1$
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-->
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<SPAN CLASS="MATH"><IMG
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WIDTH="128" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
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SRC="img127.png"
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ALT="$0 \le iam \le np-1$"></SPAN>;
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</LI>
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<LI>If the user has requested on <code>psb_init</code> a number of
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processes less than the total available in the parallel execution
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environment, the remaining processes will have on return <SPAN CLASS="MATH"><IMG
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WIDTH="73" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
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SRC="img128.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>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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ALT="$iam=-1$"></SPAN>;
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the only call involving <code>icontxt</code> that any such process may
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execute is to <code>psb_exit</code>.
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</LI>
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</OL>
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HREF="node102.html">psb_get_mpicomm Get</A>
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HREF="node98.html">Parallel environment routines</A>
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HREF="node100.html">psb_info Return</A>
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