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psblas3:
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Worked on documentation. 2. Fixed performance problem with gen_block_map: changed to use a hash internally. 3. Changed ppde to implement a convection-diffusion problem with centered differences.
This commit is contained in:
Salvatore Filippone
+99
-86
@@ -7,8 +7,8 @@ original version by: Nikos Drakos, CBLU, University of Leeds
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Jens Lippmann, Marek Rouchal, Martin Wilck and others -->
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<HTML>
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<HEAD>
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<TITLE>psb_init -- Initializes PSBLAS parallel environment</TITLE>
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<META NAME="description" CONTENT="psb_init -- Initializes PSBLAS parallel environment">
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<TITLE>psb_loc_to_glob -- Local to global indices conversion</TITLE>
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<META NAME="description" CONTENT="psb_loc_to_glob -- Local to global indices conversion">
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<META NAME="keywords" CONTENT="userhtml">
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@@ -20,95 +20,88 @@ original version by: Nikos Drakos, CBLU, University of Leeds
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<BR>
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<B> Next:</B> <A NAME="tex2html1108"
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HREF="node74.html">psb_info Return</A>
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<B> Up:</B> <A NAME="tex2html1104"
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HREF="node72.html">Parallel environment routines</A>
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HREF="node72.html">Parallel environment routines</A>
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<B> <A NAME="tex2html1106"
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<B> Next:</B> <A NAME="tex2html1128"
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HREF="node74.html">psb_is_owned</A>
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<B> Up:</B> <A NAME="tex2html1124"
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HREF="node55.html">Data management routines</A>
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<B> Previous:</B> <A NAME="tex2html1118"
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HREF="node72.html">psb_glob_to_loc Global</A>
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<B> <A NAME="tex2html1126"
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HREF="node1.html">Contents</A></B>
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<BR>
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<BR>
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<!--End of Navigation Panel-->
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<H2><A NAME="SECTION00081000000000000000">
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psb_init -- Initializes PSBLAS parallel environment</A>
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<H2><A NAME="SECTION000718000000000000000">
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psb_loc_to_glob -- Local to global indices
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conversion</A>
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</H2>
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<P>
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<PRE>
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call psb_init(icontxt, np, basectxt, ids)
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call psb_loc_to_glob(x, y, desc_a, info, iact)
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call psb_loc_to_glob(x, desc_a, info, iact)
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</PRE>
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<P>
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This subroutine initializes the PSBLAS parallel environment, defining
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a virtual parallel machine.
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<DL>
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<DT><STRONG>Type:</STRONG></DT>
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<DD>Synchronous.
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<DD>Asynchronous.
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</DD>
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<DT><STRONG><B>On Entry </B></STRONG></DT>
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<DT><STRONG><B>On Entry</B></STRONG></DT>
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<DD>
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</DD>
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<DT><STRONG>np</STRONG></DT>
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<DD>Number of processes in the PSBLAS virtual parallel machine.
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<DT><STRONG>x</STRONG></DT>
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<DD>An integer vector of indices to be converted.
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<BR>
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Scope: <B>global</B>.
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Scope: <B>local</B>
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<BR>
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Type: <B>optional</B>.
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Type: <B>required</B>
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<BR>
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Intent: <B>in, inout</B>.
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<BR>
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Specified as: a rank one integer array.
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<BR></DD>
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<DT><STRONG>desc_a</STRONG></DT>
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<DD>the communication descriptor.
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<BR>
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Scope:<B>local</B>.
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<BR>
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Type:<B>required</B>.
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<BR>
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Intent: <B>in</B>.
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<BR>
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Specified as: an integer value. Default: use all available processes.
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Specified as: a structured data of type descdata<TT>psb_desc_type</TT>.
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</DD>
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<DT><STRONG>basectxt</STRONG></DT>
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<DD>the initial communication context. The new context
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will be defined from the processes participating in the initial one.
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<DT><STRONG>iact</STRONG></DT>
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<DD>specifies action to be taken in case of range errors.
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Scope: <B>global</B>
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<BR>
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Scope: <B>global</B>.
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<BR>
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Type: <B>optional</B>.
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Type: <B>optional</B>
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<BR>
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Intent: <B>in</B>.
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<BR>
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Specified as: an integer value. Default: use MPI_COMM_WORLD.
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</DD>
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<DT><STRONG>ids</STRONG></DT>
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<DD>Identities of the processes to use for the new context; the
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argument is ignored when <code>np</code> is not specified. This allows the
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processes in the new environment to be in an order different from the
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original one.
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<BR>
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Scope: <B>global</B>.
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<BR>
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Type: <B>optional</B>.
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<BR>
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Intent: <B>in</B>.
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<BR>
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Specified as: an integer array. Default: use the indices <IMG
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WIDTH="94" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
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SRC="img94.png"
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ALT="$(0\dots np-1)$">.
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Specified as: a character variable <code>I</code>gnore, <code>W</code>arning or
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<code>A</code>bort, default <code>I</code>gnore.
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</DD>
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</DL>
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@@ -117,60 +110,80 @@ Specified as: an integer array. Default: use the indices <IMG
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<DT><STRONG><B>On Return</B></STRONG></DT>
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<DD>
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</DD>
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<DT><STRONG>icontxt</STRONG></DT>
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<DD>the communication context identifying the virtual
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parallel machine. Note that this is always a duplicate of
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<code>basectxt</code>, so that library communications are completely
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separated from other communication operations.
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<DT><STRONG>x</STRONG></DT>
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<DD>If <IMG
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WIDTH="12" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img26.png"
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ALT="$y$"> is not present,
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then <IMG
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WIDTH="14" HEIGHT="13" ALIGN="BOTTOM" BORDER="0"
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SRC="img25.png"
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ALT="$x$"> is overwritten with the translated integer indices.
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Scope: <B>global</B>
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<BR>
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Scope: <B>global</B>.
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Type: <B>required</B>
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<BR>
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Type: <B>required</B>.
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Intent: <B>inout</B>.
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<BR>
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Specified as: a rank one integer array.
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</DD>
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<DT><STRONG>y</STRONG></DT>
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<DD>If <IMG
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WIDTH="12" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img26.png"
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ALT="$y$"> is not present,
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then <IMG
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WIDTH="12" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img26.png"
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ALT="$y$"> is overwritten with the translated integer indices, and <IMG
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WIDTH="14" HEIGHT="13" ALIGN="BOTTOM" BORDER="0"
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SRC="img25.png"
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ALT="$x$">
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is left unchanged.
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Scope: <B>global</B>
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<BR>
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Type: <B>optional</B>
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<BR>
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Intent: <B>out</B>.
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<BR>
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Specified as: an integer variable.
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Specified as: a rank one integer array.
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</DD>
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<DT><STRONG>info</STRONG></DT>
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<DD>Error code.
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<BR>
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Scope: <B>local</B>
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<BR>
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Type: <B>required</B>
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<BR>
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Intent: <B>out</B>.
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<BR>
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An integer value; 0 means no error has been detected.
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</DD>
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</DL>
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<P>
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<FONT SIZE="+1"><B>Notes</B></FONT>
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<OL>
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<LI>A call to this routine must precede any other PSBLAS call.
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</LI>
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<LI>It is an error to specify a value for <IMG
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WIDTH="22" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img122.png"
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ALT="$np$"> greater than the
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number of processes available in the underlying base parallel
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environment.
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</LI>
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</OL>
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<P>
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<HR>
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