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').

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

SEE ALSO
  dgord(1), gmk_hy(1), gtst(1).

  Scotch user's manual.

AUTHOR
  Francois Pellegrini <francois.pellegrini@labri.fr>
