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140 lines
5.9 KiB
140 lines
5.9 KiB
<!-------- @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: Ordering Algorithms</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_parmetis.html">Next</a> | <a href="ug_alg_hier.html">Previous</a></i></b></div>
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<!---------------------------------------------------------------------------->
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<h2>
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<a NAME="Ordering Algorithms"></a>Ordering Algorithms</h2>
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The following graph (sparse matrix) ordering algorithms are currently included in the Zoltan toolkit:
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<blockquote>
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<a href="ug_order_parmetis.html">Nested dissection by METIS/ParMETIS </a><br>
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<a href="ug_order_ptscotch.html">Nested dissection by Scotch/PT-Scotch</a><br>
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<a href="ug_order_local_hsfc.html">Local ordering with Hilbert space filling curves</a>
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</blockquote>
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These methods produce orderings for various applications (e.g., reducing fill in sparse matrix factorizations).
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Ordering is accessed through calls to
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<b><a href="ug_interface_order.html#Zoltan_Order">Zoltan_Order</a></b>.
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<p><!---------------------------------------------------------------------------->
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<h3>
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<b>Third-party libraries</b>
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</h3>
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Currently, most ordering in Zoltan is provided through the third-party libraries METIS/ParMETIS and PT-Scotch.
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The one exception is the local Hilbert space filling curve ordering.
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To use the other methods, a third-party library must be present.
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<h3>
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<a NAME="Order Parameters"></a>
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<hr><b>Ordering Parameters</b></h3>
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While the overall behavior of Zoltan is controlled by <a href="ug_param.html">general
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Zoltan parameters</a>, the behavior of each ordering method is controlled
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by parameters specific to ordering which are also set by calls to <b><a href="ug_interface_init.html#Zoltan_Set_Param">Zoltan_Set_Param</a></b>.
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Many of these parameters are specific to individual ordering algorithms,
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and are listed in the descriptions of the individual algorithms.
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However, several have meaning across multiple ordering algorithms. These
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parameters are described below.
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<br>
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<table WIDTH="100%" NOSAVE >
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<tr VALIGN=TOP>
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<td VALIGN=TOP><b>Parameters:</b></td>
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<td></td>
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</tr>
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<tr VALIGN=TOP NOSAVE>
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<td NOSAVE><a NAME="ORDER_METHOD"></a> <i>ORDER_METHOD</i></td>
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<td>The order algorithm used by Zoltan is specified by this parameter.
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Valid values are
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<blockquote>
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"METIS" (sequential <a href="ug_order_parmetis.html">nodal nested dissection by METIS</a>),
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<br>"PARMETIS" (parallel <a href="ug_order_parmetis.html">nodal nested dissection by ParMETIS </a>),
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<br>"SCOTCH" (sequential ordering using <a href="ug_order_ptscotch.html">Scotch</a>),
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<br>"PTSCOTCH" (parallel ordering using <a href="ug_order_ptscotch.html">PT-Scotch</a>),
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<br>"LOCAL_HSFC" (local ordering using <a href="ug_order_local_hsfc.html">Hilbert space filling curves</a>), and
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<br>"NONE" (for no ordering).
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</blockquote>
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</td>
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</tr>
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<tr VALIGN=TOP>
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<td VALIGN=TOP><a NAME="Default_Parameter_Values"></a><b>Default Values:</b></td>
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<td></td>
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</tr>
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<tr VALIGN=TOP>
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<td></td>
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<td><i>ORDER_METHOD</i> = PARMETIS (with MPI), METIS (when no MPI)</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_parmetis.html">Next:
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Nested dissection by ParMETIS</a> | <a href="ug_alg_hier.html">Previous:
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Hybrid Hierarchical Partitioning</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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