scotch_amk_grf - Man Page

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').

Since decomposition-defined target architecture files have a size which is quadratic in the number of target vertices, because of the presence 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 architectures 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>

Info

02 September 2020 Scotch user's manual