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Salvatore Filippone
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@@ -7,8 +7,8 @@ original version by: Nikos Drakos, CBLU, University of Leeds
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<TITLE>psb_init -- Initializes PSBLAS parallel environment</TITLE>
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<H2><A NAME="SECTION00081000000000000000">
psb_init -- Initializes PSBLAS parallel
<H1><A NAME="SECTION00080000000000000000"></A>
<A NAME="sec:parenv"></A>
<BR>
Parallel environment routines
</H1>
<P>
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<A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></A>
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<LI><A NAME="tex2html1405"
HREF="node95.html">psb_init -- Initializes PSBLAS parallel
environment</A>
</H2>
<P>
<PRE>
call psb_init(icontxt, np, basectxt, ids)
</PRE>
<P>
This subroutine initializes the PSBLAS parallel environment, defining
a virtual parallel machine.
<DL>
<DT><STRONG>Type:</STRONG></DT>
<DD>Synchronous.
</DD>
<DT><STRONG><B>On Entry </B></STRONG></DT>
<DD>
</DD>
<DT><STRONG>np</STRONG></DT>
<DD>Number of processes in the PSBLAS virtual parallel machine.
<BR>
Scope: <B>global</B>.
<BR>
Type: <B>optional</B>.
<BR>
Intent: <B>in</B>.
<BR>
Specified as: an integer value. Default: use all available processes.
</DD>
<DT><STRONG>basectxt</STRONG></DT>
<DD>the initial communication context. The new context
will be defined from the processes participating in the initial one.
<BR>
Scope: <B>global</B>.
<BR>
Type: <B>optional</B>.
<BR>
Intent: <B>in</B>.
<BR>
Specified as: an integer value. Default: use MPI_COMM_WORLD.
</DD>
<DT><STRONG>ids</STRONG></DT>
<DD>Identities of the processes to use for the new context; the
argument is ignored when <code>np</code> is not specified. This allows the
processes in the new environment to be in an order different from the
original one.
<BR>
Scope: <B>global</B>.
<BR>
Type: <B>optional</B>.
<BR>
Intent: <B>in</B>.
<BR>
Specified as: an integer array. Default: use the indices <IMG
WIDTH="94" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
SRC="img93.png"
ALT="$(0\dots np-1)$">.
</DD>
</DL>
<P>
<DL>
<DT><STRONG><B>On Return</B></STRONG></DT>
<DD>
</DD>
<DT><STRONG>icontxt</STRONG></DT>
<DD>the communication context identifying the virtual
parallel machine. Note that this is always a duplicate of
<code>basectxt</code>, so that library communications are completely
separated from other communication operations.
<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>A call to this routine must precede any other PSBLAS call.
</LI>
<LI>It is an error to specify a value for <IMG
WIDTH="21" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
SRC="img126.png"
ALT="$np$"> greater than the
number of processes available in the underlying base parallel
environment.
</LI>
</OL>
<P>
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<LI><A NAME="tex2html1406"
HREF="node96.html">psb_info -- Return information about PSBLAS parallel
environment</A>
<LI><A NAME="tex2html1407"
HREF="node97.html">psb_exit -- Exit from PSBLAS parallel
environment</A>
<LI><A NAME="tex2html1408"
HREF="node98.html">psb_get_mpicomm -- Get the MPI communicator</A>
<LI><A NAME="tex2html1409"
HREF="node99.html">psb_get_rank -- Get the MPI rank</A>
<LI><A NAME="tex2html1410"
HREF="node100.html">psb_wtime -- Wall clock timing</A>
<LI><A NAME="tex2html1411"
HREF="node101.html">psb_barrier -- Sinchronization point parallel
environment</A>
<LI><A NAME="tex2html1412"
HREF="node102.html">psb_abort -- Abort a computation</A>
<LI><A NAME="tex2html1413"
HREF="node103.html">psb_bcast -- Broadcast data</A>
<LI><A NAME="tex2html1414"
HREF="node104.html">psb_sum -- Global sum</A>
<LI><A NAME="tex2html1415"
HREF="node105.html">psb_max -- Global maximum</A>
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HREF="node106.html">psb_min -- Global minimum</A>
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HREF="node107.html">psb_amx -- Global maximum absolute value</A>
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<LI><A NAME="tex2html1419"
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