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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="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>

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