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173 lines
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173 lines
4.7 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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original version by: Nikos Drakos, CBLU, University of Leeds
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HREF="node87.html">psb_exit Exit</A>
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HREF="node84.html">Parallel environment routines</A>
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HREF="node85.html">psb_init Initializes</A>
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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_info(icontxt, iam, np)
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</PRE>
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<P>
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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>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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</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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</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>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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<IMG
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WIDTH="139" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
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SRC="img118.png"
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ALT="$-1 \le iam \le np-1$"> </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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<FONT SIZE="+1"><B>Notes</B></FONT>
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<OL>
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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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<IMG
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WIDTH="128" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
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SRC="img119.png"
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ALT="$0 \le iam \le np-1$">;
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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 <IMG
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WIDTH="73" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
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SRC="img120.png"
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ALT="$iam=-1$">;
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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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HREF="node84.html">Parallel environment routines</A>
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