File: mpb-split.1

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.\" Copyright (C) 1999-2014 Massachusetts Institute of Technology.
.\"
.\" This program is free software; you can redistribute it and/or modify
.\" it under the terms of the GNU General Public License as published by
.\" the Free Software Foundation; either version 2 of the License, or
.\" (at your option) any later version.
.\"
.\" This program is distributed in the hope that it will be useful,
.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
.\" GNU General Public License for more details.
.\"
.\" You should have received a copy of the GNU General Public License
.\" along with this program; if not, write to the Free Software
.\" Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
.\"
.TH MPB 1 "March 13, 2002" "MPB" "MIT Photonic-Bands Package"
.SH NAME
mpb-split \- compute eigenmodes with MPB using multiple processes
.SH SYNOPSIS
.B mpb-split
\fINUM-SPLIT\fR [\fIDEFINITION\fR]... [\fICTLFILE\fR]...
.SH DESCRIPTION
.PP
.\" Add any additional description here
mpb-split is a parallelizing front-end to MIT Photonic Bands (MPB).
For a computation with several k points, it splits the list of k
points over multiple processes.  Of course, this will only benefit you
on a system where different processes will run on different
processors, such as an SMP or a cluster with automatic process
migration (e.g. MOSIX). mpb-split is actually a trivial shell script,
though, so you can easily modify it if you need to use a special
command to launch processes on other processors/machines.

MIT Photonic Bands (MPB) is a free program to compute the band
structures (dispersion relations) and electromagnetic modes of
periodic dielectric structures, and is applicable both to photonic
crystals (photonic band-gap materials) and a wide range of other
optical problems.
.PP
More information on MPB, including a detailed manual, can be found
online at the MPB home page:
.I http://ab-initio.mit.edu/mpb/
.PP
A typical invocation of
.I mpb-split
looks like:
.PP
.\"  .Vb 1
\&    mpb-split num-split foo.ctl >& foo.out
.\"  .Ve
.PP
This causes
.I mpb-split
to process the control file foo.ctl, divide the k points into
. B num-split
equal chunks, run each list in a separate process with MPB, and
redirect the output (in order) to foo.out.  (One typically redirects
output to a file, as the output is verbose and contains a number of
comma-delimited datasets that one can extract by grepping.)
.PP
Overall, the behavior and arguments are the same as for
.I mpb
except that the first argument must be the integer \fBnum-split\fR.
.PP
What 
.I mpb-split
technically does is to set the MPB variable k-split-num to 
.B num-split
and k-split-index to the index (starting with 0) of the chunk for each
process. If you want, you can use these variables to divide the
problem in some other way and then reset them to 1 and 0,
respectively.
.SH BUGS
Send bug reports to S. G. Johnson, stevenj@alum.mit.edu.
.SH AUTHORS
Written by Steven G. Johnson.  Copyright (c) 1999-2012 by
the Massachusetts Institute of Technology.
.SH "SEE ALSO"
mpb(1), mpb-data(1)