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<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="img123.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="img124.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="img125.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>
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