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	<CENTER><A HREF = "http://lammps.sandia.gov">LAMMPS WWW Site</A> - <A HREF = "Manual.html">LAMMPS Documentation</A> - <A HREF = "Section_commands.html#comm">LAMMPS Commands</A>
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	<H3>communicate command
	</H3>
	<P><B>Syntax:</B>
	</P>
	<PRE>communicate style
	</PRE>
	<UL><LI>style = <I>single</I> or <I>multi</I>
	</UL>
	<P><B>Examples:</B>
	</P>
	<PRE>communicate multi
	</PRE>
	<P><B>Description:</B>
	</P>
	<P>This command sets the style of inter-processor communication that
	occurs each timestep as atom coordinates and other properties are
	exchanged between neighboring processors.
	</P>
	<P>The default style is <I>single</I> which means each processor acquires
	information for ghost atoms that are within a single distance from its
	sub-domain. The distance is the maximum of the neighbor cutoff for
	all atom type pairs.
	</P>
	<P>For many systems this is an efficient algorithm, but for systems with
	widely varying cutoffs for different type pairs, the <I>multi</I> style can
	be faster. In this case, each atom type is assigned its own distance
	cutoff for communication purposes, and fewer atoms will be
	communicated. See the <A HREF = "neighbor.html">neighbor multi</A> command for a
	neighbor list construction option that may also be beneficial for
	simulations of this kind.
	</P>
	<P><B>Restrictions:</B> none
	</P>
	<P><B>Related commands:</B>
	</P>
	<P><A HREF = "neighbor.html">neighbor</A>
	</P>
	<P><B>Default:</B>
	</P>
	<P>style = single
	</P>
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