gcv(1) [debian man page]
gcv(1) Scotch user's manual gcv(1) NAME
gcv - graph file converter SYNOPSIS
gcv [options] [igfile] [ogfile] [oxfile] DESCRIPTION
The gcv program converts Scotch graph files from and to other external file formats. File igfile is converted into graph file ogfile, with optional geometry data being put in geometry file oxfile, if it is available. 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, gcv 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 compres- sion formats which can be supported are the bzip2 format ('.bz2'), the gzip format ('.gz'), and the lzma format ('.lzma', on input only). OPTIONS
-h Display some help. -iifmt Set format of input graph file, which can be: bnum Boeing-Harwell format. This is a matrix format. Only square matrices are supported. Square matrices with unsymmetric pattern are symmetrized. In case the file contains several matrices, the num parameter allow the user to provide the index of the matrix to convert, starting from 0. When the num parameter is not set, it is assumed to be 0. c Chaco format. This is an adjacency graph format, also used by MeTiS. m Matrix Market format. This is a matrix format describing individual edges. Matrix pattern is symmetrized, such that rectangu- lar matrices are eventually squared. s Scotch graph format. This is an adjacency graph format. -oofmt Set format of output graph file, which can be: c Chaco format. m Matrix Market symmetric pattern format. s Scotch format. This is the default. -V Display program version and copyright. EXAMPLE
Convert a Matrix Market graph into a Scotch graph. Matrix Market files do not comprise geometry data, so no geometry file is needed on out- put: $ gcv -im brol.mm brol.grf SEE ALSO
gbase(1), gtst(1), gmap(1), gord(1), gout(1). Scotch user's manual. AUTHOR
Francois Pellegrini <francois.pellegrini@labri.fr> February 14, 2011 gcv(1)
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dgord(1) PT-Scotch user's manual dgord(1) NAME
dgord - compute sparse matrix orderings of graphs in parallel SYNOPSIS
dgord [options] [gfile] [ofile] [lfile] DESCRIPTION
The dgord program computes, in a parallel way, an ordering of a Scotch source graph representing the pattern of some symmetric sparse matrix. Source graph file gfile is either a centralized graph file, or a set of files representing fragments of a distributed graph. 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 repre- sented by a dash '-'. When the proper libraries have been included at compile time, dgord 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). dgord 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
-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. x enforce scalability. -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 parallel graph ordering strategy strat (see PT-Scotch user's manual for more information). -rpnum Set root process for centralized files (default is 0). -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. EXAMPLES
Run dgord on 5 processing elements to reorder matrix graph brol.grf and save the resulting ordering to file brol.ord, using the default sequential graph ordering strategy: $ mpirun -np 5 dgord brol.grf brol.ord Run dgord on 5 processing elements to reorder the distributed matrix 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 dgord brol%p-%r.dgr brol.ord SEE ALSO
dgtst(1), dgscat(1), gmk_hy(1), gord(1). PT-Scotch user's manual. AUTHOR
Francois Pellegrini <francois.pellegrini@labri.fr> February 14, 2011 dgord(1)