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Updated docs.
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Salvatore Filippone
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@@ -7,8 +7,8 @@ original version by: Nikos Drakos, CBLU, University of Leeds
Jens Lippmann, Marek Rouchal, Martin Wilck and others -->
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<TITLE>psb_info -- Return information about PSBLAS parallel environment</TITLE>
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<TITLE>Parallel environment routines</TITLE>
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<H2><A NAME="SECTION00082000000000000000">
psb_info -- Return information about PSBLAS parallel
<H1><A NAME="SECTION00080000000000000000"></A>
<A NAME="sec:parenv"></A>
<BR>
Parallel environment routines
</H1>
<P>
<BR><HR>
<!--Table of Child-Links-->
<A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></A>
<UL>
<LI><A NAME="tex2html1472"
HREF="node99.html">psb_init -- Initializes 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="img126.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="img127.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="img128.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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<LI><A NAME="tex2html1473"
HREF="node100.html">psb_info -- Return information about PSBLAS parallel
environment</A>
<LI><A NAME="tex2html1474"
HREF="node101.html">psb_exit -- Exit from PSBLAS parallel
environment</A>
<LI><A NAME="tex2html1475"
HREF="node102.html">psb_get_mpicomm -- Get the MPI communicator</A>
<LI><A NAME="tex2html1476"
HREF="node103.html">psb_get_rank -- Get the MPI rank</A>
<LI><A NAME="tex2html1477"
HREF="node104.html">psb_wtime -- Wall clock timing</A>
<LI><A NAME="tex2html1478"
HREF="node105.html">psb_barrier -- Sinchronization point parallel
environment</A>
<LI><A NAME="tex2html1479"
HREF="node106.html">psb_abort -- Abort a computation</A>
<LI><A NAME="tex2html1480"
HREF="node107.html">psb_bcast -- Broadcast data</A>
<LI><A NAME="tex2html1481"
HREF="node108.html">psb_sum -- Global sum</A>
<LI><A NAME="tex2html1482"
HREF="node109.html">psb_max -- Global maximum</A>
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HREF="node110.html">psb_min -- Global minimum</A>
<LI><A NAME="tex2html1484"
HREF="node111.html">psb_amx -- Global maximum absolute value</A>
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HREF="node112.html">psb_amn -- Global minimum absolute value</A>
<LI><A NAME="tex2html1486"
HREF="node113.html">psb_snd -- Send data</A>
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