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.TH pscotch_dgord 1 "June 01, 2008" "" "PT-Scotch user's manual"
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\fBpscotch_dgord \fP- compute sparse matrix orderings in parallel
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\fBpscotch_dgord\fP [\fIoptions\fP] [\fIgfile\fP] [\fIofile\fP] [\fIlfile\fP]
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The \fBpscotch_dgord\fP program computes, in a parallel way, an ordering of a
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source graph representing the pattern of some symmetric sparse
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Source graph file \fIgfile\fP is either a centralized graph file, or a set
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of files representing fragments of a distributed graph. The resulting
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ordering is stored in file \fIofile\fP. Eventual logging information (such
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as the one produced by option \fB-v\fP) is sent to file \fIlfile\fP. When file
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names are not specified, data is read from standard input and
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written to standard output. Standard streams can also be explicitely
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represented by a dash '-'.
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When the proper libraries have been included at compile time, \fBdgord\fP
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can directly handle compressed graphs, both as input and output. A
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stream is treated as compressed whenever its name is postfixed with
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a compressed file extension, such as in 'brol.grf.bz2' or '-.gz'. The
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compression formats which can be supported are the bzip2 format
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('.bz2'), the gzip format ('.gz'), and the lzma format ('.lzma', on
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\fBpscotch_dgord\fP bases on implementations of the MPI interface to spread work
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across the processing elements. It is therefore not likely to be run
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directly, but instead through some launcher command such as \fBmpirun\fP.
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Save column block mapping data to file \fImfile\fP.
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Use distributed ordering strategy \fIstrat\fP (see
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PT-Scotch user's manual for more information).
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Set root process for centralized files (default is 0).
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Save partitioning tree data to file \fItfile\fP.
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Display program version and copyright.
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Set verbose mode to \fIverb\fP. It is a set of one of more
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characters which can be:
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Run \fBpscotch_dgord\fP on 5 processing elements to reorder matrix graph brol.grf
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and save the resulting ordering to file brol.ord.
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$ mpirun -np 5 pscotch_dgord brol.grf brol.ord
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Run \fBpscotch_dgord\fP on 5 processing elements to reorder the distributed matrix
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stored on graph fragment files brol5-0.grf to brol5-4.grf, and save
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the resulting ordering to file brol.ord (see \fBdgscat\fP(1) for an
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explanation of the '%p' and '%r' sequences in names of distributed
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$ mpirun -np 5 pscotch_dgord brol%p-%r.grf brol.ord
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\fBpscotch_dgtst\fP(1), \fBpscotch_dgscat\fP(1), \fBscotch_gmk_hy\fP(1), \fBscotch_gord\fP(1).
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PT-Scotch user's manual.
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Francois Pellegrini <francois.pellegrini@labri.fr>