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psblas3:
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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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Jens Lippmann, Marek Rouchal, Martin Wilck and others -->
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<HTML>
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<HEAD>
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<TITLE>psb_precinit -- Initialize a preconditioner</TITLE>
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<META NAME="description" CONTENT="psb_precinit -- Initialize a preconditioner">
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<TITLE>Preconditioner routines</TITLE>
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<META NAME="description" CONTENT="Preconditioner routines">
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@@ -18,124 +18,75 @@ original version by: Nikos Drakos, CBLU, University of Leeds
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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="tex2html1617"
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HREF="node113.html">psb_precbld Builds</A>
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<B> Up:</B> <A NAME="tex2html1613"
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HREF="node111.html">Preconditioner routines</A>
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<B> Previous:</B> <A NAME="tex2html1607"
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HREF="node111.html">Preconditioner routines</A>
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<B> <A NAME="tex2html1615"
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<B> Next:</B> <A NAME="tex2html1614"
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HREF="node113.html">psb_precinit Initialize</A>
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<B> Previous:</B> <A NAME="tex2html1604"
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HREF="node111.html">mm_mat_write Write</A>
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<B> <A NAME="tex2html1612"
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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="SECTION000111000000000000000">
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psb_precinit -- Initialize a preconditioner</A>
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</H2>
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<H1><A NAME="SECTION000110000000000000000"></A>
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<A NAME="sec:precs"></A>
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<BR>
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Preconditioner routines
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</H1>
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<P>
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<PRE>
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call psb_precinit(prec, ptype, info)
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</PRE>
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<A NAME="sec:psprecs"></A>The base PSBLAS library contains the implementation of two simple
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preconditioning techniques:
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<UL>
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<LI>Diagonal Scaling
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</LI>
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<LI>Block Jacobi with ILU(0) factorization
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</LI>
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</UL>
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The supporting data type and subroutine interfaces are defined in the
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module <code>psb_prec_mod</code>.
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<P>
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<DL>
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<DT><STRONG>Type:</STRONG></DT>
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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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</DD>
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<DT><STRONG>ptype</STRONG></DT>
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<DD>the type of preconditioner.
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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>in</B>.
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<BR>
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Specified as: a character string, see usage notes.
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</DD>
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<DT><STRONG><B>On Exit</B></STRONG></DT>
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<DD><P>
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</DD>
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<DT><STRONG>prec</STRONG></DT>
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<DD>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: a preconditioner data structure precdata<TT>psb_prec_type</TT>.
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</DD>
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<DT><STRONG>info</STRONG></DT>
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<DD>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>out</B>.
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<BR>
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Error code: if no error, 0 is returned.
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</DD>
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</DL>
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<FONT SIZE="+1"><B>Notes</B></FONT>
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Legal inputs to this subroutine are interpreted depending on the
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<IMG
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WIDTH="42" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img136.png"
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ALT="$ptype$"> string as follows<A NAME="tex2html30"
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HREF="footnode.html#foot7086"><SUP>3</SUP></A>:
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<DL>
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<DT><STRONG>NONE</STRONG></DT>
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<DD>No preconditioning, i.e. the preconditioner is just a copy
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operator.
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</DD>
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<DT><STRONG>DIAG</STRONG></DT>
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<DD>Diagonal scaling; each entry of the input vector is
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multiplied by the reciprocal of the sum of the absolute values of
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the coefficients in the corresponding row of matrix <IMG
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WIDTH="16" HEIGHT="14" ALIGN="BOTTOM" BORDER="0"
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SRC="img1.png"
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ALT="$A$">;
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</DD>
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<DT><STRONG>BJAC</STRONG></DT>
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<DD>Precondition by a factorization of the
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block-diagonal of matrix <IMG
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WIDTH="16" HEIGHT="14" ALIGN="BOTTOM" BORDER="0"
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SRC="img1.png"
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ALT="$A$">, where block boundaries are determined
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by the data allocation boundaries for each process; requires no
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communication. Only the incomplete factorization <IMG
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WIDTH="56" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
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SRC="img137.png"
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ALT="$ILU(0)$"> is
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currently implemented.
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</DD>
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</DL>
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<BR><HR>
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<!--Table of Child-Links-->
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<A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></A>
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<P>
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<UL>
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<LI><A NAME="tex2html1615"
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HREF="node113.html">psb_precinit -- Initialize a preconditioner</A>
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<LI><A NAME="tex2html1616"
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HREF="node114.html">psb_precbld -- Builds a preconditioner</A>
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<LI><A NAME="tex2html1617"
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HREF="node115.html">psb_precaply -- Preconditioner application routine</A>
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<LI><A NAME="tex2html1618"
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HREF="node116.html">psb_precdescr -- Prints a description of current
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preconditioner</A>
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</UL>
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<!--End of Table of Child-Links-->
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<BR><HR>
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</BODY>
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