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)