mord(1) Scotch user's manual mord(1)NAMEmord - compute sparse matrix orderings of meshes
SYNOPSISmord [options] [mfile] [ofile] [lfile]
DESCRIPTION
The mord program computes, in a sequential way, an ordering of a Scotch
source mesh representing the pattern of some symmetric sparse matrix.
Only nodes of the mesh are effectively ordered. Elements provide con‐
nectivity information, such that every node is considered to be linked
to all of the nodes which share at least an element with it.
Source mesh file mfile can only be a centralized mesh file. The result‐
ing 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 meshes, both as input and output. A stream
is treated as compressed whenever its name is postfixed with a com‐
pressed file extension, such as in 'brol.msh.bz2' or '-.gz'. The com‐
pression 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 spec‐
ifies, for each node vertex, the index of the column block to
which this node vertex belongs.
-ostrat
Use sequential mesh 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 node vertex, the index of the first
node vertex of the parent block of the block to which the node
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 mesh brol.msh and save the resulting ordering to file
brol.ord using the default sequential mesh ordering strategy:
$ mord brol.msh brol.ord
SEE ALSOgmk_msh(1), gotst(1), mtst(1).
Scotch user's manual.
AUTHOR
Francois Pellegrini <francois.pellegrini@labri.fr>
February 14, 2011 mord(1)
