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485 lines
18 KiB
485 lines
18 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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! Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
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! met:
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! notice, this list of conditions and the following disclaimer.
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! 2. Redistributions in binary form must reproduce the above copyright
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! THIS SOFTWARE IS PROVIDED BY SANDIA CORPORATION "AS IS" AND ANY
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! Questions? Contact Karen Devine kddevin@sandia.gov
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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"
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content="text/html; charset=iso-8859-1">
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<meta name="GENERATOR"
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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: Hypergraph Partitioning</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_alg_patoh.html">Next</a> | <a
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href="ug_alg_hypergraph.html">Previous</a></i></b></div>
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<h2 =""><a name="PHG"></a>PHG - Parallel Hypergraph and Graph Partitioning with
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Zoltan</h2>
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This is the built-in parallel hypergraph partitioner in Zoltan.
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<p>
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<table nosave="" width="100%">
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<tbody>
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<tr>
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<td valign="top"><b>Value of LB_METHOD:</b></td>
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<td><b>HYPERGRAPH</b> (for <a href="ug_alg_hypergraph.html">hypergraph</a> partitioning) or <br>
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<b>GRAPH</b> (for <a href="ug_alg_graph.html">graph</a> partitioning)
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</td>
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</tr>
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<tr>
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<td valign="top"><b>Value of HYPERGRAPH_PACKAGE:</b></td>
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<td><b>PHG</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><br>
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</td>
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</tr>
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<tr>
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<td valign="top"><i> LB_APPROACH<br>
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</i></td>
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<td>The load balancing approach:. <br>
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<i>REPARTITION</i> - partition but try to stay close to the
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current partition/distribution
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<br>
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<i>REFINE</i> - refine the current partition/distribution;
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assumes only small changes
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<br>
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<i>PARTITION</i> - partition from scratch, not taking
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the current data distribution into account<br>
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</td>
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</tr>
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<tr>
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<td style="vertical-align: top;"> <span
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style="font-style: italic;">PHG_REPART_MULTIPLIER</span><br>
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</td>
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<td style="vertical-align: top;"> For repartitioning, this
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parameter determines the trade-off between application communication
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(as represented by cut edges) and data migration related to
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rebalancing. PHG attempts to minimize the function
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(PHG_REPART_MULTIPLIER* edge_cut + migration volume). The migration
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volume is measured using the <a href="ug_query_mig.html#ZOLTAN_OBJ_SIZE_MULTI_FN">ZOLTAN_OBJ_SIZE_MULTI_FN</a> or <a href="ug_query_mig.html#ZOLTAN_OBJ_SIZE_FN">ZOLTAN_OBJ_SIZE_FN</a> query functions. Make sure the
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units for edges and object sizes are the same.<br>
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Simply put, to emphasize communication within the application, use a
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large value for PHG_REPART_MULTIPLIER. Typically this should be
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proportional to the number of iterations between load-balancing calls. </td>
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</tr>
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<tr>
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<td valign="top"><i> PHG_MULTILEVEL<br>
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</i></td>
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<td>This parameter specifies whether a multilevel method
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should be used (1) or not (0). Multilevel methods produce higher quality but
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require more execution time and memory.
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</td>
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</tr>
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<tr>
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<td style="vertical-align: top;"> <a
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name="PHG_EDGE_WEIGHT_OPERATION"></a><span style="font-style: italic;">PHG_EDGE_WEIGHT_OPERATION</span>
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</td>
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<td style="vertical-align: top;">Operation to be applied to edge
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weights supplied by different processes for the same hyperedge:<br>
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<i>ADD</i> - the hyperedge weight will be the sum of the supplied
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weights<br>
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<i>MAX</i> - the hyperedge weight will be the maximum of the
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supplied weights<br>
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<i>ERROR</i> - if the hyperedge weights are not equal, Zoltan
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will flag an error, otherwise the hyperedge weight will be the value
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returned by the processes<br>
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</td>
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</tr>
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<tr>
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<td style="vertical-align: top;"> <span
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style="font-style: italic;">ADD_OBJ_WEIGHT</span><br>
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</td>
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<td style="vertical-align: top;"> Add another object (vertex)
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weight. Currently multi-weight partitioning is not supported, but this
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parameter may also be used for implicit vertex weights. Valid values
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are: <br>
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<i>NONE</i> <br>
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<i>UNIT</i> or <i>VERTICES</i> (each vertex has weight 1.0) <br>
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<i>PINS</i> or <i>NONZEROS</i> or <i>vertex degree</i> (vertex
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weight equals number of hyperedges containing it, i.e., the degree)<br>
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</td>
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</tr>
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<tr>
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<td style="vertical-align: top;"> <span
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style="font-style: italic;">PHG_CUT_OBJECTIVE</span><br>
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</td>
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<td style="vertical-align: top;"> Selects the partitioning
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objective, <i>CONNECTIVITY</i> or <i>HYPEREDGES</i>. While hyperedges
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simply counts the number of hyperedges cut, the connectivity metric
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weights each cut edge by the number of participating parts minus one
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(aka the λ-1 cut metric). The connectivity metric better represents
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communication volume for most applications. The hyperedge metric is
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useful for certain applications, e.g., minimizing matrix border size in
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block matrix decompositions. <br>
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</td>
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</tr>
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<tr>
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<td style="vertical-align: top;"><span style="font-style: italic;">
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PHG_OUTPUT_LEVEL</span><br>
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</td>
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<td style="vertical-align: top;">Level of verbosity; 0 is silent.<br>
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</td>
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</tr>
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<tr>
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<td style="vertical-align: top;"> <span
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style="font-style: italic;">CHECK_HYPERGRAPH</span><br>
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</td>
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<td style="vertical-align: top;">Check that the query functions
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return valid input data; 0 or 1. (This slows performance; intended for
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debugging.)<br>
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</td>
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</tr>
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<tr>
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<td valign="top"><i> PHG_COARSENING_METHOD</i></td>
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<td>Low-level parameter: The method to use in the matching/coarsening phase:<br>
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<span style="font-style: italic;">AGG</span> - agglomerative inner product
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matching (a.k.a. agglomerative heavy connectivity matching); gives high quality.<br>
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<span style="font-style: italic;">IPM</span> - inner product
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matching (a.k.a. heavy connectivity matching); gives high quality.<br>
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<span style="font-style: italic;">L-IPM </span>- local IPM
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on each processor. Faster but usually gives poorer quality. <br>
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<span style="font-style: italic;">A-IPM</span> - alternate
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between IPM and L-IPM. (A compromise between speed and quality.)<br>
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<span style="font-style: italic;">none - </span>no
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coarsening<i><br>
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</i></td>
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</tr>
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<tr>
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<td valign="top"> <i>PHG_COARSEPARTITION_METHOD</i></td>
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<td>Low-level parameter: Method to partition the coarsest (smallest) hypergraph;
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typically done in serial:<br>
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<span style="font-style: italic;">RANDOM</span> - random<br>
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<span style="font-style: italic;">LINEAR</span> - linear
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assignment of the vertices (ordered by the user query function)<br>
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<span style="font-style: italic;">GREEDY</span> - greedy method
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based on minimizing cuts<br>
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<span style="font-style: italic;">AUTO</span> -
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automatically select from the above methods (in parallel, the processes
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will do different methods)<br>
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</td>
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</tr>
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<tr>
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<td style="vertical-align: top;"> <span
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style="font-style: italic;">PHG_REFINEMENT_METHOD</span><br>
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</td>
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<td style="vertical-align: top;">Low-level parameter: Refinement algorithm:<br>
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<span style="font-style: italic;">FM</span> - approximate
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Fiduccia-Mattheyses (FM)<br>
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<span style="font-style: italic;">NO</span> - no refinement<br>
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</td>
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</tr>
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<tr>
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<td valign=top> <i>PHG_REFINEMENT_QUALITY</i></td>
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<td>Low-level parameter: Knob to control the trade-off between run time and quality. 1
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is the recommended (default) setting, >1 gives more refinement
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(higher quality partitions but longer run time), while <1 gives less
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refinement (and
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poorer quality).<br>
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</td>
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</tr>
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<tr>
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<td style="vertical-align: top;"> <span
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style="font-style: italic;">PHG_RANDOMIZE_INPUT</span><br>
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</td>
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<td style="vertical-align: top;">Low-level parameter: Randomize layout of vertices and
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hyperedges in internal parallel 2D layout? <br>
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Setting this parameter to 1 often reduces Zoltan-PHG execution time.<br>
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</td>
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</tr>
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<tr nosave="" valign="top">
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<td> <span style="font-style: italic;">PHG_EDGE_SIZE_THRESHOLD</span><br>
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</td>
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<td nosave="">Low-level parameter: Value 0.0 through 1.0, if number of vertices in
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hyperedge divided by total vertices in hypergraph exceeds this
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fraction, the hyperedge will be omitted.<br>
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</td>
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</tr>
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<tr nosave="" valign="top">
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<td> <span style="font-style: italic;">PHG_PROCESSOR_REDUCTION_LIMIT</span><br>
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</td>
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<td nosave="">Low-level parameter: In V-cycle, redistribute coarsened hypergraph to
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this
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fraction of processors when number of pins in coarsened hypergraph is
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less than
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this fraction of original number of pins. Original number of pins is
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redefined
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after each processor redistribution.<br>
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</td>
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</tr>
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<tr>
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</tr>
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<tr>
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<td valign="top"><b>Default values:</b></td>
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<td><br>
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</td>
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</tr>
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<tr>
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<td><br>
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</td>
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<td><i>LB_APPROACH = REPARTITION<br>
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</i></td>
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</tr>
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<tr>
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<td style="vertical-align: top;"><br>
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</td>
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<td style="vertical-align: top;"><span style="font-style: italic;">PHG_REPART_MULTIPLIER=100</span></td>
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</tr>
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<tr>
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<td style="vertical-align: top;"><br>
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</td>
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<td style="vertical-align: top;"><span style="font-style: italic;">PHG_MULTILEVEL=1 if LB_APPROACH = partition or repartition; 0 otherwise.</span></td>
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</tr>
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<tr>
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<td><br>
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</td>
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<td><span style="font-style: italic;">PHG_EDGE_WEIGHT_OPERATION=max</span></td>
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</tr>
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<tr>
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<td style="vertical-align: top;"><br>
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</td>
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<td style="vertical-align: top;"><span style="font-style: italic;">ADD_OBJ_WEIGHT=none</span></td>
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</tr>
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<tr>
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<td style="vertical-align: top;"><br>
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</td>
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<td style="vertical-align: top;"><span style="font-style: italic;">PHG_CUT_OBJECTIVE=connectivity</span></td>
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</tr>
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<tr>
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<td style="vertical-align: top;"><br>
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</td>
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<td style="vertical-align: top;"><span style="font-style: italic;">CHECK_HYPERGRAPH=0</span><br>
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</td>
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</tr>
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<tr>
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<td><br>
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</td>
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<td><span style="font-style: italic;">PHG_OUTPUT_LEVEL=0</span></td>
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</tr>
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<tr>
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<td><br>
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</td>
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<td><i>PHG_COARSENING_METHOD=agg</i></td>
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</tr>
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<tr>
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<td style="vertical-align: top;"><br>
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</td>
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<td style="vertical-align: top;"><i>PHG_COARSEPARTITION_METHOD=auto</i></td>
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</tr>
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<tr>
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<td style="vertical-align: top;"><br>
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</td>
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<td style="vertical-align: top;"><span style="font-style: italic;">PHG_REFINEMENT_METHOD=fm</span></td>
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</tr>
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<tr>
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<td style="vertical-align: top;"><br>
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</td>
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<td style="vertical-align: top;"><i>PHG_REFINEMENT_QUALITY=1</i></td>
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</tr>
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<tr>
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<td style="vertical-align: top;"><br>
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</td>
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<td style="vertical-align: top;"><span style="font-style: italic;">PHG_RANDOMIZE_INPUT=0</span></td>
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</tr>
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<tr>
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<td style="vertical-align: top;"><br>
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</td>
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<td style="vertical-align: top;"><span style="font-style: italic;">PHG_EDGE_SIZE_THRESHOLD=0.25</span></td>
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</tr>
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<tr>
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<td style="vertical-align: top;"><br>
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</td>
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<td style="vertical-align: top;"><span style="font-style: italic;">PHG_PROCESSOR_REDUCTION_LIMIT=0.5</span></td>
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</tr>
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<tr>
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<td valign="top"><b>Required Query Functions for <i>LB_METHOD = HYPERGRAPH</i>:</b></td>
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<td><br>
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</td>
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</tr>
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<tr>
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<td><br>
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</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><br>
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</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 nosave="" valign="top">
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<td><br>
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</td>
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<td nosave=""> <b><a href="ug_query_lb.html#ZOLTAN_HG_SIZE_CS_FN">ZOLTAN_HG_SIZE_CS_FN</a></b>
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<br>
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<b><a href="ug_query_lb.html#ZOLTAN_HG_CS_FN">ZOLTAN_HG_CS_FN</a></b>
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</td>
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</tr>
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<tr>
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<td valign="top"><b>Optional Query Functions for <i>LB_METHOD = HYPERGRAPH</i>:</b></td>
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<td><br>
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</td>
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</tr>
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<tr>
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|
<td><br>
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</td>
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<td>
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<b><a href="ug_query_mig.html#ZOLTAN_OBJ_SIZE_MULTI_FN">ZOLTAN_OBJ_SIZE_MULTI_FN</a></b>
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or
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<b><a href="ug_query_mig.html#ZOLTAN_OBJ_SIZE_FN">ZOLTAN_OBJ_SIZE_FN</a></b> for <i>LB_APPROACH</i>=<i>Repartition</i>.
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</td>
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</tr>
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<tr>
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<td><br>
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</td>
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<td>
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<b><a href="ug_query_lb.html#ZOLTAN_PART_MULTI_FN">ZOLTAN_PART_MULTI_FN</a></b>
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or
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<b><a href="ug_query_lb.html#ZOLTAN_PART_FN">ZOLTAN_PART_FN</a></b> for <i>LB_APPROACH</i>=<i>Repartition</i> and for <a href="ug_alg.html#REMAP"><i>REMAP</i></a>=1.
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</td>
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</tr>
|
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<tr>
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<td><br>
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</td>
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<td><b><a href="ug_query_lb.html#ZOLTAN_HG_SIZE_EDGE_WTS_FN">ZOLTAN_HG_SIZE_EDGE_WTS_FN</a></b></td>
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</tr>
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<tr>
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<td><br>
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</td>
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<td><b><a href="ug_query_lb.html#ZOLTAN_HG_EDGE_WTS_FN">ZOLTAN_HG_EDGE_WTS_FN</a></b></td>
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</tr>
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<tr>
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<td><br>
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</td>
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<td><b><a href="ug_query_lb.html#ZOLTAN_NUM_FIXED_OBJ_FN">ZOLTAN_NUM_FIXED_OBJ_FN</a></b></td>
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</tr>
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<tr>
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<td><br>
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</td>
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<td><b><a href="ug_query_lb.html#ZOLTAN_FIXED_OBJ_LIST_FN">ZOLTAN_FIXED_OBJ_LIST_FN</a></b></td>
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</tr>
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<tr>
|
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<td valign=top><b>Note for<br><i>LB_METHOD = HYPERGRAPH:</i></b></td>
|
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<td><br>
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</td>
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</tr>
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<tr>
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<td><br>
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</td>
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<td>
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It is possible to provide the graph query functions instead of the
|
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hypergraph queries, though this is not recommended. If only graph query
|
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functions are registered, Zoltan will automatically create a hypergraph
|
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from the graph, but this is not equivalent to graph partitioning.
|
|
In particular, the edge weights will not be accurate.
|
|
</td>
|
|
</tr>
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<tr>
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<td valign="top"><b>Required Query Functions for <i>LB_METHOD = GRAPH</i>:</b></td>
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|
<td><br>
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|
</td>
|
|
</tr>
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|
<tr>
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|
<td><br>
|
|
</td>
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<td><b><a href="ug_query_lb.html#ZOLTAN_NUM_OBJ_FN">ZOLTAN_NUM_OBJ_FN</a></b></td>
|
|
</tr>
|
|
<tr>
|
|
<td><br>
|
|
</td>
|
|
<td><b><a href="ug_query_lb.html#ZOLTAN_OBJ_LIST_FN">ZOLTAN_OBJ_LIST_FN</a></b>
|
|
</td>
|
|
</tr>
|
|
<tr nosave="" valign="top">
|
|
<td><br>
|
|
</td>
|
|
<td nosave="">
|
|
<b><a href="ug_query_lb.html#ZOLTAN_NUM_EDGES_MULTI_FN">ZOLTAN_NUM_EDGES_MULTI_FN</a></b>
|
|
or
|
|
<b><a href="ug_query_lb.html#ZOLTAN_NUM_EDGES_FN">ZOLTAN_NUM_EDGES_FN</a></b>
|
|
<br>
|
|
<b><a href="ug_query_lb.html#ZOLTAN_EDGE_LIST_MULTI_FN">ZOLTAN_EDGE_LIST_MULTI_FN</a></b>
|
|
or
|
|
<b><a href="ug_query_lb.html#ZOLTAN_EDGE_LIST_FN">ZOLTAN_EDGE_LIST_FN</a></b>
|
|
</td>
|
|
</tr>
|
|
<tr>
|
|
<td valign="top"><b>Optional Query Functions for <i>LB_METHOD = GRAPH</i>:</b></td>
|
|
<td><br>
|
|
</td>
|
|
</tr>
|
|
<tr>
|
|
<td><br>
|
|
</td>
|
|
<td>
|
|
<b><a href="ug_query_mig.html#ZOLTAN_OBJ_SIZE_MULTI_FN">ZOLTAN_OBJ_SIZE_MULTI_FN</a></b>
|
|
or
|
|
<b><a href="ug_query_mig.html#ZOLTAN_OBJ_SIZE_FN">ZOLTAN_OBJ_SIZE_FN</a></b> for <i>LB_APPROACH</i>=<i>Repartition</i>.
|
|
</td>
|
|
</tr>
|
|
<tr>
|
|
<td><br>
|
|
</td>
|
|
<td>
|
|
<b><a href="ug_query_lb.html#ZOLTAN_PART_MULTI_FN">ZOLTAN_PART_MULTI_FN</a></b>
|
|
or
|
|
<b><a href="ug_query_lb.html#ZOLTAN_PART_FN">ZOLTAN_PART_FN</a></b> for <i>LB_APPROACH</i>=<i>Repartition</i> and for <a href="ug_alg.html#REMAP"><i>REMAP</i></a>=1.
|
|
</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
<p>
|
|
</p>
|
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href="ug_alg_patoh.html">Next:
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