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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
+144
-45
@@ -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>get_global_cols -- Get number of global cols</TITLE>
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<META NAME="description" CONTENT="get_global_cols -- Get number of global cols">
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<TITLE>Sparse Matrix class</TITLE>
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<META NAME="description" CONTENT="Sparse Matrix class">
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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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@@ -18,80 +18,179 @@ original version by: Nikos Drakos, CBLU, University of Leeds
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<LINK REL="STYLESHEET" HREF="userhtml.css">
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<LINK REL="previous" HREF="node18.html">
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<LINK REL="up" HREF="node15.html">
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<LINK REL="next" HREF="node29.html">
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<LINK REL="previous" HREF="node15.html">
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<LINK REL="up" HREF="node8.html">
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<LINK REL="next" HREF="node20.html">
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</HEAD>
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<BODY >
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<!--Navigation Panel-->
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<A NAME="tex2html405"
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<A NAME="tex2html432"
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HREF="node20.html">
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<IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="next.png"></A>
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<A NAME="tex2html401"
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HREF="node15.html">
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<A NAME="tex2html428"
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HREF="node8.html">
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<IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="up.png"></A>
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<A NAME="tex2html397"
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<A NAME="tex2html422"
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HREF="node18.html">
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<IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="prev.png"></A>
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<A NAME="tex2html403"
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<A NAME="tex2html430"
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HREF="node1.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="tex2html406"
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HREF="node20.html">get_context Get communication context</A>
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<B> Up:</B> <A NAME="tex2html402"
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HREF="node15.html">Data structure query routines</A>
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<B> Previous:</B> <A NAME="tex2html398"
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HREF="node18.html">get_global_rows Get</A>
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<B> <A NAME="tex2html404"
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<B> Next:</B> <A NAME="tex2html433"
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HREF="node20.html">Methods</A>
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<B> Up:</B> <A NAME="tex2html429"
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HREF="node8.html">Data Structures and Classes</A>
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<B> Previous:</B> <A NAME="tex2html423"
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HREF="node18.html">Named Constants</A>
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<B> <A NAME="tex2html431"
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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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<H3><A NAME="SECTION00045400000000000000">
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get_global_cols -- Get number of global cols</A>
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</H3>
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<P>
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<PRE>
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nr = desc%get_global_cols()
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</PRE>
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<P>
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<H2><A NAME="SECTION00043000000000000000"></A>
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<A NAME="sec:spmat"></A>
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<BR>
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Sparse Matrix class
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</H2>
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The spdata<TT>psb_spmat_type</TT> class
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contains all information about the local portion of the sparse matrix and
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its storage mode. Its design is
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based on the STATE design pattern [<A
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HREF="node118.html#DesignPatterns">13</A>] as detailed
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in [<A
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HREF="node118.html#Sparse03">11</A>]; the type declaration is shown in
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figure <A HREF="#fig:spmattype">4</A> where <code>T</code> is a placeholder for the
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data type and precision variants
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<DL>
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<DT><STRONG>Type:</STRONG></DT>
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<DD>Asynchronous.
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<DT><STRONG>S</STRONG></DT>
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<DD>Single precision real;
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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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<DT><STRONG>D</STRONG></DT>
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<DD>Double precision real;
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</DD>
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<DT><STRONG>desc</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: a structured data of type descdata<TT>psb_desc_type</TT>.
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<DT><STRONG>C</STRONG></DT>
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<DD>Single precision complex;
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</DD>
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<DT><STRONG>Z</STRONG></DT>
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<DD>Double precision complex.
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</DD>
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</DL>
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The actual data is contained in the polymorphic component <code>a%a</code>; its
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specific layout can be chosen dynamically among the predefined types,
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or an entirely new storage layout can be implemented and passed to the
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library at runtime via the <code>psb_spasb</code> routine.
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<P>
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<DIV ALIGN="CENTER"><A NAME="fig:spmattype"></A><A NAME="706"></A>
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<TABLE>
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<CAPTION ALIGN="BOTTOM"><STRONG>Figure 4:</STRONG>
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The PSBLAS defined data type that
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contains a sparse matrix.</CAPTION>
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<TR><TD>
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<BR>
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<DIV ALIGN="CENTER">
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<!-- MATH
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$\fbox{\TheSbox}$
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-->
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<IMG
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WIDTH="535" HEIGHT="218" ALIGN="MIDDLE" BORDER="0"
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SRC="img20.png"
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ALT="\fbox{\TheSbox}">
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</DIV></TD></TR>
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</TABLE>
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</DIV>
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The following very common formats are precompiled in PSBLAS and thus
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are always available:
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<DL>
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<DT><STRONG><B>On Return</B></STRONG></DT>
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<DD>
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<DT><STRONG>psb_T_coo_sparse_mat</STRONG></DT>
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<DD>Coordinate storage;
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</DD>
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<DT><STRONG>Function value</STRONG></DT>
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<DD>The number of global cols in the mesh
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<DT><STRONG>psb_T_csr_sparse_mat</STRONG></DT>
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<DD>Compressed storage by rows;
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</DD>
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<DT><STRONG>psb_T_csc_sparse_mat</STRONG></DT>
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<DD>Compressed storage by columns;
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</DD>
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</DL>
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The inner sparse matrix has an associated state, which can take the
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following values:
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<DL>
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<DT><STRONG>Build:</STRONG></DT>
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<DD>State entered after the first allocation, and before the
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first assembly; in this state it is possible to add nonzero entries.
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</DD>
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<DT><STRONG>Assembled:</STRONG></DT>
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<DD>State entered after the assembly; computations using
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the sparse matrix, such as matrix-vector products, are only possible
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in this state;
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</DD>
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<DT><STRONG>Update:</STRONG></DT>
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<DD>State entered after a reinitalization; this is used to
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handle applications in which the same sparsity pattern is used
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multiple times with different coefficients. In this state it is only
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possible to enter coefficients for already existing nonzero entries.
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</DD>
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</DL>
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The only storage variant supporting the build state is COO; all other
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variants are obtained by conversion to/from it.
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<P>
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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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<UL>
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<LI><A NAME="tex2html434"
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HREF="node20.html">Methods</A>
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<LI><A NAME="tex2html435"
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HREF="node21.html">get_nrows -- Get number of rows in a sparse matrix</A>
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<LI><A NAME="tex2html436"
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HREF="node22.html">get_ncols -- Get number of columns in a sparse matrix</A>
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<LI><A NAME="tex2html437"
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HREF="node23.html">get_nnzeros -- Get number of nonzero elements
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in a sparse matrix</A>
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<LI><A NAME="tex2html438"
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HREF="node24.html">get_size -- Get maximum number of nonzero elements
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in a sparse matrix</A>
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<LI><A NAME="tex2html439"
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HREF="node25.html">sizeof -- Get memory occupation in bytes
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of a sparse matrix</A>
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<LI><A NAME="tex2html440"
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HREF="node26.html">get_fmt -- Short description of the dynamic type</A>
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<LI><A NAME="tex2html441"
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HREF="node27.html">is_bld, is_upd, is_asb -- Status check</A>
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<LI><A NAME="tex2html442"
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HREF="node28.html">Named Constants</A>
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</UL>
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<!--End of Table of Child-Links-->
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<HR>
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<!--Navigation Panel-->
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HREF="node8.html">
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<IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="up.png"></A>
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<A NAME="tex2html422"
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HREF="node18.html">
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<IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="prev.png"></A>
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HREF="node1.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="tex2html433"
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HREF="node20.html">Methods</A>
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<B> Up:</B> <A NAME="tex2html429"
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HREF="node8.html">Data Structures and Classes</A>
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<B> Previous:</B> <A NAME="tex2html423"
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HREF="node18.html">Named Constants</A>
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<B> <A NAME="tex2html431"
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HREF="node1.html">Contents</A></B>
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</HTML>
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