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152 lines
5.3 KiB
152 lines
5.3 KiB
2 years ago
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<!-------- @HEADER
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!
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! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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!
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! Zoltan Toolkit for Load-balancing, Partitioning, Ordering and Coloring
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! Copyright 2012 Sandia Corporation
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!
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! Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
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! the U.S. Government retains certain rights in this software.
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!
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! Redistribution and use in source and binary forms, with or without
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! modification, are permitted provided that the following conditions are
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! met:
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!
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! 1. Redistributions of source code must retain the above copyright
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! notice, this list of conditions and the following disclaimer.
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!
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! 2. Redistributions in binary form must reproduce the above copyright
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! notice, this list of conditions and the following disclaimer in the
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! documentation and/or other materials provided with the distribution.
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!
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! 3. Neither the name of the Corporation nor the names of the
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! contributors may be used to endorse or promote products derived from
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! this software without specific prior written permission.
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!
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! THIS SOFTWARE IS PROVIDED BY SANDIA CORPORATION "AS IS" AND ANY
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! EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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! IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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! PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SANDIA CORPORATION OR THE
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! CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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! EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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! PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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! PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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! LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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! NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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! SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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!
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! Questions? Contact Karen Devine kddevin@sandia.gov
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! Erik Boman egboman@sandia.gov
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!
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! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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!
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! @HEADER
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------->
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<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<meta name="GENERATOR" content="Mozilla/4.76 [en] (X11; U; Linux 2.4.2-2smp i686) [Netscape]">
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<meta name="sandia.approval_type" content="formal">
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<meta name="sandia.approved" content="SAND2007-4748W">
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<meta name="author" content="Zoltan PI">
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<title>Zoltan User's Guide: Nested Dissection by Scotch</title>
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</head>
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<body bgcolor="#FFFFFF">
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<div align=right><b><i><a href="ug.html">Zoltan User's Guide</a>
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| <a href="ug_order_local_hsfc.html">Next</a> | <a href="ug_order_parmetis.html">Previous</a></i></b></div>
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<h2>
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<a NAME="PT-Scotch"></a>Nested Dissection by Scotch</h2> Nested
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Dissection is a popular method to compute fill-reducing orderings for
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graphs and sparse matrices. It can also be used for other ordering
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purposes. The algorithm recursively finds a separator (bisector) in a
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graph, orders the nodes in the two subsets first, and nodes in the
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separator last.
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<p>
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Scotch is a library for ordering and partitioning, developed at LaBRI
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in Bordeaux, France. PT-Scotch is the parallel module in Scotch. (We
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use the names Scotch and PT-Scotch interchangeably.) Scotch is a
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third-party library in Zoltan and should be obtained separately from
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the <a href="https://www.labri.fr/perso/pelegrin/scotch/">Scotch web
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site</a>. Zoltan supports version 5.1 of Scotch.
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<p>
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If the parameter <a href="ug_order.html#ORDER_METHOD">ORDER_METHOD</a> is
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set to SCOTCH, the sequential version of Scotch is called.
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If the parameter <a href="ug_order.html#ORDER_METHOD">ORDER_METHOD</a> is
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set to PTSCOTCH, the parallel version of Scotch (PT-Scotch) is called.
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</p>
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<table WIDTH="100%" NOSAVE >
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<tr>
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<td VALIGN=TOP><b>Order_Method String:</b></td>
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<td><b>PTSCOTCH or SCOTCH</b></td>
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</tr>
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<tr>
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<td><b>Parameters:</b></td>
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<td></td>
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</tr>
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<tr>
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<td VALIGN=TOP> SCOTCH_METHOD</td>
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<td>For now, always set to NODEND</td>
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</tr>
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<tr>
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<td VALIGN=TOP> SCOTCH_STRAT</td>
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<td>The Scotch strategy string; see the Scotch documentation.</td>
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</tr>
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<tr>
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<td VALIGN=TOP> SCOTCH_STRAT_FILE</td>
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<td>A file that contains an arbitrary long Scotch strategy string; see the Scotch documentation.</td>
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</tr>
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<tr>
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<td VALIGN=TOP><b>Required Query Functions:</b></td>
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<td></td>
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</tr>
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<tr>
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<td></td>
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<td><b><a href="ug_query_lb.html#ZOLTAN_NUM_OBJ_FN">ZOLTAN_NUM_OBJ_FN</a></b></td>
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</tr>
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<tr>
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<td></td>
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<td><b><a href="ug_query_lb.html#ZOLTAN_OBJ_LIST_FN">ZOLTAN_OBJ_LIST_FN</a></b>
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</td>
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</tr>
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<tr VALIGN=TOP>
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<td></td>
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<td NOSAVE>
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<b><a href="ug_query_lb.html#ZOLTAN_NUM_EDGES_MULTI_FN">ZOLTAN_NUM_EDGES_MULTI_F
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N</a></b> or
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<b><a href="ug_query_lb.html#ZOLTAN_NUM_EDGES_FN">ZOLTAN_NUM_EDGES_FN</a></b>
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<br>
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<b><a href="ug_query_lb.html#ZOLTAN_EDGE_LIST_MULTI_FN">ZOLTAN_EDGE_LIST_MULTI_F
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N</a></b> or
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<b><a href="ug_query_lb.html#ZOLTAN_EDGE_LIST_FN">ZOLTAN_EDGE_LIST_FN</a></b>
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</td>
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</tr>
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</table>
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<p>
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<hr WIDTH="100%">[<a href="ug.html">Table of Contents</a> | <a href="ug_order_local_hsfc.html">Next:
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Local Ordering with HSFC</a> | <a href="ug_order_parmetis.html">Previous: Ordering by ParMetis</a> | <a href="https://www.sandia.gov/general/privacy-security/index.html">Privacy and Security</a>]
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</body>
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</html>
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