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gord(1) Scotch user's manual gord(1)
NAME
gord - compute sparse matrix orderings of graphs
SYNOPSIS
gord [options] [gfile] [ofile] [lfile]
DESCRIPTION
The gord program computes, in a sequential way, an ordering of a Scotch
source graph representing the pattern of some symmetric sparse matrix.
Source graph file gfile can only be a centralized graph file. The
resulting ordering is stored in file ofile. Eventual logging
information (such as the one produced by option -v) is sent to file
lfile. When file names are not specified, data is read from standard
input and written to standard output. Standard streams can also be
explicitely represented by a dash '-'.
When the proper libraries have been included at compile time, gord can
directly handle compressed graphs, both as input and output. A stream
is treated as compressed whenever its name is postfixed with a
compressed file extension, such as in 'brol.grf.bz2' or '-.gz'. The
compression formats which can be supported are the bzip2 format
('.bz2'), the gzip format ('.gz'), and the lzma format ('.lzma', on
input only).
OPTIONS
-c?opt Choose default ordering strategy according to one or several
options among:
b enforce load balance as much as possible.
q privilege quality over speed (default).
s privilege speed over quality.
t enforce safety.
-h Display some help.
-m?mfile
Save column block mapping data to file mfile. Mapping data
specifies, for each vertex, the index of the column block to
which this vertex belongs.
-o?strat
Use sequential graph ordering strategy strat (see Scotch user's
manual for more information).
-t?tfile
Save partitioning tree data to file tfile. Partitioning tree
data specifies, for each vertex, the index of the first vertex
of the parent block of the block to which the vertex belongs.
Altogether with the mapping data provided in file mfile, it
allows one to rebuild the separator tree of the nested
dissection process.
-V Display program version and copyright.
-v?verb
Set verbose mode to verb. It is a set of one of more characters
which can be:
s strategy information.
t timing information.
EXAMPLE
Reorder matrix graph brol.grf and save the resulting ordering to file
brol.ord using the default sequential graph ordering strategy:
$ gord brol.grf brol.ord
SEE ALSO
dgord(1), gmk_hy(1), gtst(1).
Scotch user's manual.
AUTHOR
Francois Pellegrini <francois.pellegrini@labri.fr>
February 14, 2011 gord(1)