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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>Data Structures and Classes</TITLE>
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<META NAME="description" CONTENT="Data Structures and Classes">
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<TITLE>Programming model</TITLE>
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<META NAME="description" CONTENT="Programming model">
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@@ -18,198 +18,104 @@ 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="tex2html269"
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HREF="node9.html">Descriptor data structure</A>
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<B> Up:</B> <A NAME="tex2html265"
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HREF="userhtml.html">userhtml</A>
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<B> Previous:</B> <A NAME="tex2html259"
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HREF="node7.html">Programming model</A>
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<B> <A NAME="tex2html267"
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<B> Next:</B> <A NAME="tex2html270"
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HREF="node9.html">Data Structures and Classes</A>
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<B> Up:</B> <A NAME="tex2html266"
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HREF="node3.html">General overview</A>
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<B> Previous:</B> <A NAME="tex2html262"
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HREF="node7.html">User-defined index mappings</A>
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<B> <A NAME="tex2html268"
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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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<H1><A NAME="SECTION00040000000000000000"></A>
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<A NAME="sec:datastruct"></A>
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<BR>
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Data Structures and Classes
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</H1>
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<H2><A NAME="SECTION00034000000000000000">
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Programming model</A>
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</H2>
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<P>
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In this chapter we illustrate the data structures used for definition of
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routines interfaces. They include data structures for sparse matrices,
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communication descriptors and preconditioners.
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<P>
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All the data types and the basic subroutine interfaces related to
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descriptors and sparse matrices are defined in
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the module <code>psb_base_mod</code>; this will have to be included by every
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user subroutine that makes use of the library. The preconditioners are
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defined in the module <code>psb_prec_mod</code>
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The PSBLAS librarary is based on the Single Program Multiple Data
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(SPMD) programming model: each process participating in the
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computation performs the same actions on a chunk of data. Parallelism
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is thus data-driven.
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<P>
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Integer, real and complex data types are parametrized with a kind type
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defined in the library as follows:
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Because of this structure, many subroutines coordinate their action
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across the various processes, thus providing an implicit
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synchronization point, and therefore <I>must</I> be
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called simultaneously by all processes participating in the
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computation. This is certainly true for the data allocation and
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assembly routines, for all the computational routines and for some of
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the tools routines.
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<P>
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However there are many cases where no synchronization, and indeed no
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communication among processes, is implied; for instance, all the routines in
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sec. <A HREF="#sec:dataquery"><IMG ALIGN="BOTTOM" BORDER="1" ALT="[*]" SRC="crossref.png"></A> are only acting on the local data structures,
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and thus may be called independently. The most important case is that
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of the coefficient insertion routines: since the number of
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coefficients in the sparse and dense matrices varies among the
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processors, and since the user is free to choose an arbitrary order in
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builiding the matrix entries, these routines cannot imply a
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synchronization.
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<P>
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Throughout this user's guide each subroutine will be clearly indicated
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as:
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<DL>
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<DT><STRONG>psb_spk_</STRONG></DT>
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<DD>Kind parameter for short precision real and complex
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data; corresponds to a <code>REAL</code> declaration and is
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normally 4 bytes;
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<DT><STRONG>Synchronous:</STRONG></DT>
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<DD>must be called simultaneously by all the
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processes in the relevant communication context;
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</DD>
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<DT><STRONG>psb_dpk_</STRONG></DT>
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<DD>Kind parameter for long precision real and complex
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data; corresponds to a <code>DOUBLE PRECISION</code> declaration and is
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normally 8 bytes;
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</DD>
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<DT><STRONG>psb_ipk_</STRONG></DT>
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<DD>Kind parameter for integer data;
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with default build options this is a 4 bytes integer, but there is
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(highly) experimental support for 8-bytes integers;
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</DD>
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<DT><STRONG>psb_mpik_</STRONG></DT>
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<DD>Kind parameter for 4-bytes integer data, as is
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always used by MPI;
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</DD>
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<DT><STRONG>psb_long_int_k_</STRONG></DT>
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<DD>Kind parameter for long (8 bytes) integers,
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which are always used by the <code>sizeof</code> methods.
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<DT><STRONG>Asynchronous:</STRONG></DT>
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<DD>may be called in a totally independent manner.
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</DD>
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</DL>
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Together with the classes attributes we also discuss their
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methods. Most methods detailed here only act on the local variable,
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i.e. their action is purely local and asynchronous unless otherwise
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stated.
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The list of methods here is not completely exhaustive; many methods,
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especially those that alter the contents of the various objects, are
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usually not needed by the end-user, and therefore are described in the
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developer's documentation.
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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="tex2html270"
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HREF="node9.html">Descriptor data structure</A>
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<UL>
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<LI><A NAME="tex2html271"
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HREF="node10.html">Methods</A>
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<LI><A NAME="tex2html272"
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HREF="node11.html">get_local_rows -- Get number of local rows</A>
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<LI><A NAME="tex2html273"
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HREF="node12.html">get_local_cols -- Get number of local cols</A>
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<LI><A NAME="tex2html274"
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HREF="node13.html">get_global_rows -- Get number of global rows</A>
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<LI><A NAME="tex2html275"
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HREF="node14.html">get_global_cols -- Get number of global cols</A>
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</UL>
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<BR>
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<LI><A NAME="tex2html276"
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HREF="node15.html">
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<DIV ALIGN="LEFT">
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get_context--Get communication context
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</DIV></A>
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<UL>
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<LI><A NAME="tex2html277"
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HREF="node16.html">psb_cd_get_large_threshold -- Get threshold for
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index mapping switch</A>
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<LI><A NAME="tex2html278"
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HREF="node17.html">psb_cd_set_large_threshold -- Set threshold for
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index mapping switch</A>
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<LI><A NAME="tex2html279"
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HREF="node18.html">Named Constants</A>
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</UL>
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<BR>
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<LI><A NAME="tex2html280"
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HREF="node19.html">Sparse Matrix class</A>
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<UL>
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<LI><A NAME="tex2html281"
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HREF="node20.html">Methods</A>
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<LI><A NAME="tex2html282"
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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="tex2html283"
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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="tex2html284"
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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="tex2html285"
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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="tex2html286"
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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="tex2html287"
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HREF="node26.html">get_fmt -- Short description of the dynamic type</A>
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<LI><A NAME="tex2html288"
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HREF="node27.html">is_bld, is_upd, is_asb -- Status check</A>
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<LI><A NAME="tex2html289"
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HREF="node28.html">Named Constants</A>
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</UL>
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<BR>
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<LI><A NAME="tex2html290"
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HREF="node29.html">Dense Vector Data Structure</A>
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<UL>
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<LI><A NAME="tex2html291"
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HREF="node30.html">Methods</A>
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<LI><A NAME="tex2html292"
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HREF="node31.html">get_nrows -- Get number of rows in a dense vector</A>
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<LI><A NAME="tex2html293"
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HREF="node32.html">get_ncols -- Get number of columns in a sparse matrix</A>
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<LI><A NAME="tex2html294"
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HREF="node33.html">sizeof -- Get memory occupation in bytes
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of a dense vector matrix</A>
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<LI><A NAME="tex2html295"
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HREF="node34.html">get_vect -- Get a copy of the vector contents</A>
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</UL>
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<BR>
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<LI><A NAME="tex2html296"
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HREF="node35.html">Preconditioner data structure</A>
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</UL>
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HREF="node9.html">Data Structures and Classes</A>
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HREF="node3.html">General overview</A>
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HREF="node7.html">User-defined index mappings</A>
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