amk_grf(1) [debian man page]

amk_grf(1)						       Scotch user's manual							amk_grf(1)

NAME

       amk_grf - create target architecture from source graph

SYNOPSIS

       amk_grf [options] [gfile] [tfile]

DESCRIPTION

       The amk_grf program builds a decomposition-defined target architecture tfile from a source graph gfile.

       Target  architectures  define  the topology of the target graphs used by static mapping programs gmap(1) and dgmap(1). Target architectures
       can be either algorithmically-defined, for common, regular topologies, or decomposition-defined, such as the ones produced by amk_grf.

       When the proper libraries have been included at compile time, amk_grf can directly handle compressed files, 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.tgt.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).

       Since decomposition-defined target architecture files have a size which is quadratic in the number of target vertices, because of the pres-
       ence of a distance matrix structure, using compressed files to store them may save a lot of space.

OPTIONS

       -bstrat
	      Apply bipartitioning strategy strat to compute the recursive bipartition of the whole source graph into smaller target subdomains.

       -h     Display some help.

       -llfile
	      Only keep vertices the indices of which belong to the space-separated list stored in lfile. This allows one to create target  archi-
	      tectures which can even be disjoint subsets of a larger target architecture, modeled as a graph.

       -V     Display program version and copyright.

EXAMPLE

       Create  a  decomposition-defined target architecture from a 2D regular grid source graph of dimension 3 times 5, and save it, as a compiled
       target architecture, under the gzip(1) format, to file 'm3x5.tgt.gz'.

	   $ gmk_m2 3 5 | amk_grf | acpl - m3x5.tgt.gz

       Note that, in this precise case, it would be much preferable to use directly the 'mesh2D' algorithmically-defined target architecture.

	   $ echo "mesh2D 3 5" > m3x5.tgt

SEE ALSO

       acpl(1), amk_ccc(1), atst(1), dgmap(1), gmap(1), gmtst(1).

       Scotch user's manual.

AUTHOR

       Francois Pellegrini <francois.pellegrini@labri.fr>

								 February 14, 2011							amk_grf(1)

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

NAME

       dgmap, dgpart - compute static mappings and partitions in parallel

SYNOPSIS

       dgmap [options] [gfile] [tfile] [mfile] [lfile]

       dgpart [options] [nparts/pwght] [gfile] [mfile] [lfile]

DESCRIPTION

       The dgmap program computes, in a parallel way, a static mapping of a source graph onto a target graph.

       The  dgpart  program  is  a  simplified	interface to dgmap, which performs graph partitioning instead of static mapping. Consequently, the
       desired number of parts has to be provided, in lieu of the target architecture. When using the program for graph clustering, the number	of
       parts turns into maximum cluster weight.

       The  -b	and  -c  options allow the user to set preferences on the behavior of the mapping strategy which is used by default. The -m option
       allows the user to define a custom mapping strategy.

       The -q option turns the programs into graph clustering programs. In this case, dgmap only accepts variable-sized target architectures.

       Source graph file gfile is either a centralized graph file, or a set of files representing fragments of a distributed graph. For dgmap, the
       target  architecture  file  tfile describes either algorithmically-coded topologies such as meshes and hypercubes, or decomposition-defined
       architectures created by means of the amk_grf(1) program. See gmap(1) for a description of target architectures. The resulting  mapping	is
       stored  in  file mfile. 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, dgmap and dgpart 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).

       dgmap and dgpart base on implementations of the MPI interface to spread work across the processing elements. They are therefore not  likely
       to be run directly, but instead through some launcher command such as mpirun.

OPTIONS

       -bval  Set  maximum load imbalance ratio for graph partitioning or static mapping. When programs are used as clustering tools, this parame-
	      ter sets the maximum load imbalance ratio for recursive bipartitions. Exclusive with the -m option.

       -copt  Choose default mapping 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.

	      It is exclusive with the -m option.

	      -h     Display some help.

	      -mstrat
		     Use parallel mapping strategy strat (see PT-Scotch user's manual for more information).

	      -q     (for dgpart)

	      -qpwght
		     (for dgmap) Use the programs as graph clustering tools instead of static mapping or graph partitioning tools. For dgpart, the
		     number of parts will become the maximum cluster weight. For dgmap, this number pwght has to be passed after the option.

	      -rpnum Set root process for centralized files (default is 0).

	      -V     Display program version and copyright.

	      -vverb Set verbose mode to verb. It is a set of one of more characters which can be:

		     m	    mapping information.

		     s	    strategy information.

		     t	    timing information.

NOTE

       At  the	time  being  (version 5.1), dgmap cannot compute full static mappings as gmap(1) does, but only partitions (that is, mappings onto
       unweighted or weighted complete graphs). Target architectures other than the 'cmplt' and 'wcmplt' ones will lead to an error message.

EXAMPLES

       Run dgpart on 5 processing elements to compute a partition into 7 parts of graph brol.grf and save the resulting ordering to file brol.map.

	   $ mpirun -np 5 dgpart 7 brol.grf brol.map

       Run dgpart on 5 processing elements to partition into 7 parts  the  distributed	graph  stored  on  graph  fragment  files  brol5-0.dgr	to
       brol5-4.dgr,  and  save the resulting mapping to file brol.map (see dgscat(1) for an explanation of the '%p' and '%r' sequences in names of
       distributed graph fragments).

	   $ mpirun -np 5 dgpart 7 brol%p-%r.dgr brol.map

SEE ALSO

       dgtst(1), dgscat(1), amk_grf(1), acpl(1), gmap(1), gmtst(1).

       PT-Scotch user's manual.

AUTHOR

       Francois Pellegrini <francois.pellegrini@labri.fr>

								September 01, 2011							  dgmap(1)