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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
       distributed 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.

       -r?pnum
              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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