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dgtst(1) [debian man page]

dgtst(1)						      PT-Scotch user's manual							  dgtst(1)

NAME
dgtst - test the consistency of source graphs in parallel SYNOPSIS
dgtst [options] [gfile] [lfile] DESCRIPTION
The dgtst program checks, in a parallel way, the consistency of a Scotch source graph and, in case of success, outputs some statistics regarding edge weights, vertex weights, and vertex degrees. It produces the very same results as the gtst(1) program of the Scotch sequential distribution, but unlike this latter it can handle dis- tributed graphs. Source graph file gfile is either a centralized graph file, or a set of files representing fragments of a distributed graph. The resulting statistics are stored in file lfile. When file names are not specified, data is read from standard input and written to standard output. Standard streams can also be explicitly represented by a dash '-'. When the proper libraries have been included at compile time, dgtst 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). dgtst bases on implementations of the MPI interface to spread work across the processing elements. It is therefore not likely to be run directly, but instead through some launcher command such as mpirun. OPTIONS
-h Display some help. -rpnum Set root process for centralized files (default is 0). -V Display program version and copyright. EXAMPLE
Run dgtst on 5 processing elements to test the consistency of graph brol.grf $ mpirun -np 5 dgtst brol.grf Run dgord on 5 processing elements to test the consistency of a distributed graph stored on graph fragment files brol5-0.dgr to brol5-4.dgr, and save the resulting ordering to file brol.ord (see dgscat(1) for an explanation of the '%p' and '%r' sequences in names of distributed graph fragments). $ mpirun -np 5 dgtst brol%p-%r.dgr brol.ord SEE ALSO
dgscat(1), gtst(1), dgord(1). PT-Scotch user's manual. AUTHOR
Francois Pellegrini <francois.pellegrini@labri.fr> February 14, 2011 dgtst(1)

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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
-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> February 14, 2011 gord(1)
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