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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
+70
-76
@@ -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_amx -- Global maximum absolute value</TITLE>
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<META NAME="description" CONTENT="psb_amx -- Global maximum absolute value">
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<TITLE>psb_info -- Return information about PSBLAS parallel environment</TITLE>
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<META NAME="description" CONTENT="psb_info -- Return information about PSBLAS parallel environment">
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<META NAME="keywords" CONTENT="userhtml">
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<META NAME="resource-type" CONTENT="document">
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<META NAME="distribution" CONTENT="global">
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@@ -20,52 +20,53 @@ original version by: Nikos Drakos, CBLU, University of Leeds
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<LINK REL="next" HREF="node86.html">
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<LINK REL="previous" HREF="node84.html">
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<LINK REL="up" HREF="node83.html">
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<LINK REL="next" HREF="node86.html">
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</HEAD>
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<BODY >
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<!--Navigation Panel-->
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<A NAME="tex2html1251"
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<A NAME="tex2html1285"
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HREF="node86.html">
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HREF="node84.html">
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<IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="contents.png"></A>
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<BR>
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<B> Next:</B> <A NAME="tex2html1252"
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HREF="node86.html">psb_amn Global</A>
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<B> Up:</B> <A NAME="tex2html1248"
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HREF="node72.html">Parallel environment routines</A>
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<B> Previous:</B> <A NAME="tex2html1242"
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HREF="node84.html">psb_min Global</A>
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<B> <A NAME="tex2html1250"
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<B> Next:</B> <A NAME="tex2html1286"
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HREF="node86.html">psb_exit Exit</A>
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<B> Up:</B> <A NAME="tex2html1282"
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HREF="node83.html">Parallel environment routines</A>
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<B> Previous:</B> <A NAME="tex2html1276"
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HREF="node84.html">psb_init Initializes</A>
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<B> <A NAME="tex2html1284"
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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="SECTION000813000000000000000">
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psb_amx -- Global maximum absolute value</A>
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<H2><A NAME="SECTION00082000000000000000">
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psb_info -- Return information about PSBLAS parallel
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environment</A>
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</H2>
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<P>
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<PRE>
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call psb_amx(icontxt, dat, root)
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call psb_info(icontxt, iam, np)
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</PRE>
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<P>
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This subroutine implements a maximum absolute value reduction
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operation based on the underlying communication library.
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This subroutine returns information about 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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<DD>
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@@ -82,39 +83,6 @@ Intent: <B>in</B>.
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<BR>
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Specified as: an integer variable.
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</DD>
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<DT><STRONG>dat</STRONG></DT>
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<DD>The local contribution to the global maximum.
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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>inout</B>.
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<BR>
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Specified as: an integer, real or complex variable, which may be a
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scalar, or a rank 1 or 2 array. Type, kind, rank and size must agree on all processes.
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</DD>
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<DT><STRONG>root</STRONG></DT>
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<DD>Process to hold the final value, or <IMG
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WIDTH="24" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img83.png"
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ALT="$-1$"> to make it available
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on all processes.
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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 value <!-- MATH
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$-1<= root <= np-1$
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-->
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<IMG
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WIDTH="165" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img129.png"
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ALT="$-1<= root <= np-1$">, default -1.
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<BR></DD>
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</DL>
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<P>
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@@ -122,55 +90,81 @@ Specified as: an integer value <!-- MATH
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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>dat</STRONG></DT>
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<DD>On destination process(es), the result of the maximum operation.
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<DT><STRONG>iam</STRONG></DT>
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<DD>Identifier of current process in the PSBLAS virtual parallel machine.
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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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Specified as: an integer value. <!-- MATH
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$-1 \le iam \le np-1$
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-->
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<IMG
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WIDTH="140" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
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SRC="img121.png"
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ALT="$-1 \le iam \le np-1$"> </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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<BR>
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Scope: <B>global</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>inout</B>.
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Intent: <B>out</B>.
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<BR>
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Specified as: an integer, real or complex variable, which may be a
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scalar, or a rank 1 or 2 array. Type, kind, rank and size must agree on all processes.
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</DD>
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Specified as: an integer variable. </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>The <code>dat</code> argument is both input and output, and its
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value may be changed even on processes different from the final
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result destination.
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<LI>For processes in the virtual parallel machine the identifier
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will satisfy <!-- MATH
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$0 \le iam \le np-1$
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-->
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<IMG
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WIDTH="127" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
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SRC="img122.png"
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ALT="$0 \le iam \le np-1$">;
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</LI>
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<LI>The <code>dat</code> argument may also be a long integer scalar.
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<LI>If the user has requested on <code>psb_init</code> a number of
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processes less than the total available in the parallel execution
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environment, the remaining processes will have on return <IMG
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WIDTH="74" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
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SRC="img123.png"
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ALT="$iam=-1$">;
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the only call involving <code>icontxt</code> that any such process may
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execute is to <code>psb_exit</code>.
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</LI>
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</OL>
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<P>
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<HR>
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