Section: Scotch user's manual (1)
Updated: August 03, 2010
- compute sparse matrix orderings of graphs
gord [options] [gfile] [ofile] [lfile]
program computes, in a sequential way, an ordering of a
Scotch source graph representing the pattern of some symmetric
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
Choose default ordering strategy according to one or
several options among:
enforce load balance as much as possible.
privilege quality over speed (default).
privilege speed over quality.
Display some help.
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.
Use sequential graph ordering strategy strat (see
Scotch user's manual for more information).
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.
Display program version and copyright.
Set verbose mode to verb. It is a set of one of more
characters which can be:
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
Scotch user's manual.
Francois Pellegrini <email@example.com