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<div class="section" id="comm-style-command">
<span id="index-0"></span><h1>comm_style command<a class="headerlink" href="#comm-style-command" title="Permalink to this headline"></a></h1>
<div class="section" id="syntax">
<h2>Syntax<a class="headerlink" href="#syntax" title="Permalink to this headline"></a></h2>
<div class="highlight-python"><div class="highlight"><pre>comm_style style
</pre></div>
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<ul class="simple">
<li>style = <em>brick</em> or <em>tiled</em></li>
</ul>
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<div class="section" id="examples">
<h2>Examples<a class="headerlink" href="#examples" title="Permalink to this headline"></a></h2>
<div class="highlight-python"><div class="highlight"><pre>comm_style brick
comm_style tiled
</pre></div>
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<div class="section" id="description">
<h2>Description<a class="headerlink" href="#description" title="Permalink to this headline"></a></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"><em>balance</em></a> or <a class="reference internal" href="fix_balance.html"><em>fix balance</em></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"><em>create_box</em></a>
or <a class="reference internal" href="read_data.html"><em>read_data</em></a> or <a class="reference internal" href="read_restart.html"><em>read_restart</em></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"><em>create_box</em></a> and <a class="reference internal" href="processors.html"><em>processors</em></a>
commands. The decomposition can be changed via the
<a class="reference internal" href="balance.html"><em>balance</em></a> or <a class="reference internal" href="fix_balance.html"><em>fix_balance</em></a> commands.</p>
</div>
<div class="section" id="restrictions">
<h2>Restrictions<a class="headerlink" href="#restrictions" title="Permalink to this headline"></a></h2>
<blockquote>
<div>none</div></blockquote>
</div>
<div class="section" id="related-commands">
<h2>Related commands<a class="headerlink" href="#related-commands" title="Permalink to this headline"></a></h2>
<p><a class="reference internal" href="comm_modify.html"><em>comm_modify</em></a>, <a class="reference internal" href="processors.html"><em>processors</em></a>,
<a class="reference internal" href="balance.html"><em>balance</em></a>, <a class="reference internal" href="fix_balance.html"><em>fix balance</em></a></p>
</div>
<div class="section" id="default">
<h2>Default<a class="headerlink" href="#default" title="Permalink to this headline"></a></h2>
<p>The default style is brick.</p>
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