<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"> <!--Converted with LaTeX2HTML 2008 (1.71) original version by: Nikos Drakos, CBLU, University of Leeds * revised and updated by: Marcus Hennecke, Ross Moore, Herb Swan * with significant contributions from: Jens Lippmann, Marek Rouchal, Martin Wilck and others --> <HTML> <HEAD> <TITLE>psb_info -- Return information about PSBLAS parallel environment</TITLE> <META NAME="description" CONTENT="psb_info -- Return information about PSBLAS parallel environment"> <META NAME="keywords" CONTENT="userhtml"> <META NAME="resource-type" CONTENT="document"> <META NAME="distribution" CONTENT="global"> <META NAME="Generator" CONTENT="LaTeX2HTML v2008"> <META HTTP-EQUIV="Content-Style-Type" CONTENT="text/css"> <LINK REL="STYLESHEET" HREF="userhtml.css"> <LINK REL="next" HREF="node74.html"> <LINK REL="previous" HREF="node72.html"> <LINK REL="up" HREF="node71.html"> <LINK REL="next" HREF="node74.html"> </HEAD> <BODY > <!--Navigation Panel--> <A NAME="tex2html1104" HREF="node74.html"> <IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="next.png"></A> <A NAME="tex2html1100" HREF="node71.html"> <IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="up.png"></A> <A NAME="tex2html1094" HREF="node72.html"> <IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="prev.png"></A> <A NAME="tex2html1102" HREF="node1.html"> <IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="contents.png"></A> <BR> <B> Next:</B> <A NAME="tex2html1105" HREF="node74.html">psb_exit Exit</A> <B> Up:</B> <A NAME="tex2html1101" HREF="node71.html">Parallel environment routines</A> <B> Previous:</B> <A NAME="tex2html1095" HREF="node72.html">psb_init Initializes</A> <B> <A NAME="tex2html1103" HREF="node1.html">Contents</A></B> <BR> <BR> <!--End of Navigation Panel--> <H2><A NAME="SECTION00082000000000000000"> psb_info -- Return information about PSBLAS parallel environment</A> </H2> <P> <PRE> call psb_info(icontxt, iam, np) </PRE> <P> This subroutine returns information about the PSBLAS parallel environment, defining a virtual parallel machine. <DL> <DT><STRONG>Type:</STRONG></DT> <DD>Asynchronous. </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> </DL> <P> <DL> <DT><STRONG><B>On Return</B></STRONG></DT> <DD> </DD> <DT><STRONG>iam</STRONG></DT> <DD>Identifier of current process in the PSBLAS virtual parallel machine. <BR> Scope: <B>local</B>. <BR> Type: <B>required</B>. <BR> Intent: <B>out</B>. <BR> Specified as: an integer value. <!-- MATH $-1 \le iam \le np-1$ --> <IMG WIDTH="139" HEIGHT="29" ALIGN="MIDDLE" BORDER="0" SRC="img122.png" ALT="$-1 \le iam \le np-1$"> </DD> <DT><STRONG>np</STRONG></DT> <DD>Number of processes in the PSBLAS virtual parallel machine. <BR> Scope: <B>global</B>. <BR> Type: <B>required</B>. <BR> Intent: <B>out</B>. <BR> Specified as: an integer variable. </DD> </DL> <P> <FONT SIZE="+1"><B>Notes</B></FONT> <OL> <LI>For processes in the virtual parallel machine the identifier will satisfy <!-- MATH $0 \le iam \le np-1$ --> <IMG WIDTH="128" HEIGHT="29" ALIGN="MIDDLE" BORDER="0" SRC="img123.png" ALT="$0 \le iam \le np-1$">; </LI> <LI>If the user has requested on <code>psb_init</code> a number of processes less than the total available in the parallel execution environment, the remaining processes will have on return <IMG WIDTH="73" HEIGHT="29" ALIGN="MIDDLE" BORDER="0" SRC="img124.png" ALT="$iam=-1$">; the only call involving <code>icontxt</code> that any such process may execute is to <code>psb_exit</code>. </LI> </OL> <P> <HR> <!--Navigation Panel--> <A NAME="tex2html1104" HREF="node74.html"> <IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="next.png"></A> <A NAME="tex2html1100" HREF="node71.html"> <IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="up.png"></A> <A NAME="tex2html1094" HREF="node72.html"> <IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="prev.png"></A> <A NAME="tex2html1102" HREF="node1.html"> <IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="contents.png"></A> <BR> <B> Next:</B> <A NAME="tex2html1105" HREF="node74.html">psb_exit Exit</A> <B> Up:</B> <A NAME="tex2html1101" HREF="node71.html">Parallel environment routines</A> <B> Previous:</B> <A NAME="tex2html1095" HREF="node72.html">psb_init Initializes</A> <B> <A NAME="tex2html1103" HREF="node1.html">Contents</A></B> <!--End of Navigation Panel--> </BODY> </HTML>