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Documentation changes. We have barely begun.....
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Salvatore Filippone
2011-12-16 16:45:25 +00:00
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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 -->
<HTML>
<HEAD>
<TITLE>psb_init -- Initializes PSBLAS parallel environment</TITLE>
<META NAME="description" CONTENT="psb_init -- Initializes PSBLAS parallel environment">
<TITLE>psb_info -- Return information about PSBLAS parallel environment</TITLE>
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<H2><A NAME="SECTION00081000000000000000">
psb_init -- Initializes PSBLAS parallel environment</A>
<H2><A NAME="SECTION00082000000000000000">
psb_info -- Return information about PSBLAS parallel
environment</A>
</H2>
<P>
<PRE>
call psb_init(icontxt, np, basectxt, ids)
call psb_info(icontxt, iam, np)
</PRE>
<P>
This subroutine initializes the PSBLAS parallel environment, defining
This subroutine returns information about the PSBLAS parallel environment, defining
a virtual parallel machine.
<DL>
<DT><STRONG>Type:</STRONG></DT>
<DD>Synchronous.
<DD>Asynchronous.
</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.
<DT><STRONG>icontxt</STRONG></DT>
<DD>the communication context identifying the virtual
parallel machine.
<BR>
Scope: <B>global</B>.
<BR>
Type: <B>optional</B>.
Type: <B>required</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="img95.png"
ALT="$(0\dots np-1)$">.
Specified as: an integer variable.
</DD>
</DL>
@@ -117,11 +90,24 @@ Specified as: an integer array. Default: use the indices <IMG
<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.
<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>
@@ -129,48 +115,56 @@ Type: <B>required</B>.
<BR>
Intent: <B>out</B>.
<BR>
Specified as: an integer variable.
</DD>
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>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>It is an error to specify a value for <IMG
WIDTH="22" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
SRC="img123.png"
ALT="$np$"> greater than the
number of processes available in the underlying base parallel
environment.
<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>
<P>
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