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PROGRAM:

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


-copt 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.

-mmfile
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.

-ostrat
Use sequential graph ordering strategy strat (see Scotch user's manual for more
information).

-ttfile
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.

-vverb 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

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