forked from lijiext/lammps
71 lines
2.1 KiB
HTML
71 lines
2.1 KiB
HTML
<HTML>
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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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<HR>
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<H3>communicate command
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</H3>
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<P><B>Syntax:</B>
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</P>
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<PRE>communicate style keyword value ...
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</PRE>
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<UL><LI>style = <I>single</I> or <I>multi</I>
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<LI>zero or more keyword/value pairs may be appended
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<LI>keyword = <I>group</I>
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<PRE> <I>group</I> value = group-ID = only communicate atoms in the group
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</PRE>
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</UL>
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<P><B>Examples:</B>
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</P>
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<PRE>communicate multi
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communicate multi group solvent
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</PRE>
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<P><B>Description:</B>
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</P>
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<P>This command sets the style of inter-processor communication that
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occurs each timestep as atom coordinates and other properties are
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exchanged between neighboring processors and stored as properties of
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ghost atoms.
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</P>
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<P>The default style is <I>single</I> which means each processor acquires
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information for ghost atoms that are within a single distance from its
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sub-domain. The distance is the maximum of the neighbor cutoff for
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all atom type pairs.
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</P>
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<P>For many systems this is an efficient algorithm, but for systems with
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widely varying cutoffs for different type pairs, the <I>multi</I> style can
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be faster. In this case, each atom type is assigned its own distance
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cutoff for communication purposes, and fewer atoms will be
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communicated. See the <A HREF = "neighbor.html">neighbor multi</A> command for a
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neighbor list construction option that may also be beneficial for
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simulations of this kind.
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</P>
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<P>The <I>group</I> option will limit communication to atoms in the specified
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group. This can be useful for models where no ghost atoms are needed
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for some kinds of particles. All atoms (not just those in the
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specified group) will still migrate to new processors as they move.
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The group specified with this option must also be specified via the
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"atom_modify first" command.
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</P>
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<P><B>Restrictions:</B> none
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</P>
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<P><B>Related commands:</B>
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</P>
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<P><A HREF = "neighbor.html">neighbor</A>
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</P>
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<P><B>Default:</B>
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</P>
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<P>The default settings are style = single and group = all.
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</P>
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