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<div class="section" id="comm-style-command">
<span id="index-0"></span><h1>comm_style command</h1>
<div class="section" id="syntax">
<h2>Syntax</h2>
<pre class="literal-block">
comm_style style
</pre>
<ul class="simple">
<li>style = <em>brick</em> or <em>tiled</em></li>
</ul>
</div>
<div class="section" id="examples">
<h2>Examples</h2>
<pre class="literal-block">
comm_style brick
comm_style tiled
</pre>
</div>
<div class="section" id="description">
<h2>Description</h2>
<p>This command sets the style of inter-processor communication of atom
information that occurs each timestep as coordinates and other
properties are exchanged between neighboring processors and stored as
properties of ghost atoms.</p>
<p>For the default <em>brick</em> style, the domain decomposition used by LAMMPS
to partition the simulation box must be a regular 3d grid of bricks,
one per processor. Each processor communicates with its 6 Cartesian
neighbors in the grid to acquire information for nearby atoms.</p>
<p>For the <em>tiled</em> style, a more general domain decomposition can be
used, as triggered by the <a class="reference internal" href="balance.html"><span class="doc">balance</span></a> or <a class="reference internal" href="fix_balance.html"><span class="doc">fix balance</span></a> commands. The simulation box can be
partitioned into non-overlapping rectangular-shaped &#8220;tiles&#8221; or varying
sizes and shapes. Again there is one tile per processor. To acquire
information for nearby atoms, communication must now be done with a
more complex pattern of neighboring processors.</p>
<p>Note that this command does not actually define a partitoining of the
simulation box (a domain decomposition), rather it determines what
kinds of decompositions are allowed and the pattern of communication
used to enable the decomposition. A decomposition is created when the
simulation box is first created, via the <a class="reference internal" href="create_box.html"><span class="doc">create_box</span></a>
or <a class="reference internal" href="read_data.html"><span class="doc">read_data</span></a> or <a class="reference internal" href="read_restart.html"><span class="doc">read_restart</span></a>
commands. For both the <em>brick</em> and <em>tiled</em> styles, the initial
decomposition will be the same, as described by
<a class="reference internal" href="create_box.html"><span class="doc">create_box</span></a> and <a class="reference internal" href="processors.html"><span class="doc">processors</span></a>
commands. The decomposition can be changed via the
<a class="reference internal" href="balance.html"><span class="doc">balance</span></a> or <a class="reference internal" href="fix_balance.html"><span class="doc">fix balance</span></a> commands.</p>
</div>
<div class="section" id="restrictions">
<h2>Restrictions</h2>
<blockquote>
<div>none</div></blockquote>
</div>
<div class="section" id="related-commands">
<h2>Related commands</h2>
<p><a class="reference internal" href="comm_modify.html"><span class="doc">comm_modify</span></a>, <a class="reference internal" href="processors.html"><span class="doc">processors</span></a>,
<a class="reference internal" href="balance.html"><span class="doc">balance</span></a>, <a class="reference internal" href="fix_balance.html"><span class="doc">fix balance</span></a></p>
</div>
<div class="section" id="default">
<h2>Default</h2>
<p>The default style is brick.</p>
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