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').

       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>

                                                23 November 2019                                        dgtst(1)