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<title>timer command — LAMMPS 15 May 2015 version documentation</title>
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<li>timer command</li>
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<div class="section" id="timer-command">
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<span id="index-0"></span><h1>timer command<a class="headerlink" href="#timer-command" title="Permalink to this headline">¶</a></h1>
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<div class="section" id="syntax">
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<h2>Syntax<a class="headerlink" href="#syntax" title="Permalink to this headline">¶</a></h2>
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<div class="highlight-python"><div class="highlight"><pre>timer args
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</pre></div>
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</div>
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<ul class="simple">
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<li><em>args</em> = one or more of <em>off</em> or <em>loop</em> or <em>normal</em> or <em>full</em> or <em>sync</em> or <em>nosync</em></li>
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</ul>
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<pre class="literal-block">
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<em>off</em> = do not collect or print any timing information
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<em>loop</em> = collect only the total time for the simulation loop
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<em>normal</em> = collect timer information broken down by sections (default)
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<em>full</em> = like <em>normal</em> but also include CPU and thread utilzation
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<em>sync</em> = explicitly synchronize MPI tasks between sections
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<em>nosync</em> = do not synchronize MPI tasks between sections (default)
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</pre>
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</div>
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<div class="section" id="examples">
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<h2>Examples<a class="headerlink" href="#examples" title="Permalink to this headline">¶</a></h2>
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<div class="highlight-python"><div class="highlight"><pre>timer full sync
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timer loop
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</pre></div>
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</div>
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</div>
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<div class="section" id="description">
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<h2>Description<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
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<p>Select the level of detail LAMMPS performs its CPU timings.</p>
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<p>During a simulation run LAMMPS collects information about how much
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time is spent in different sections of the code and thus can provide
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valuable information for determining performance and load imbalance
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problems. This can be done at different levels of detail and
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accuracy. For more information about the timing output, see this
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<a class="reference internal" href="Section_start.html#start-8"><span>discussion of screen output</span></a>.</p>
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<p>The <em>off</em> setting will turn all time measurements off. The <em>loop</em>
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setting will only measure the total time for a run and not collect any
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detailed per section information. With the <em>normal</em> setting, timing
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information for portions of the timestep (pairwise calculations,
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neighbor list construction, output, etc) are collected as well as
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information about load imbalances for those sections across
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procsessors. The <em>full</em> setting adds information about CPU
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utilization and thread utilization, when multi-threading is enabled.</p>
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<p>With the <em>sync</em> setting, all MPI tasks are synchronized at each timer
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call which meaures load imbalance more accuractly, though it can also
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slow down the simulation. Using the <em>nosync</em> setting (which is the
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default) turns off this synchronization.</p>
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<p>Multiple keywords can be specified. For keywords that are mutually
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exclusive, the last one specified takes effect.</p>
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<div class="admonition warning">
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<p class="first admonition-title">Warning</p>
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<p class="last">Using the <em>full</em> and <em>sync</em> options provides the most
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detailed and accurate timing information, but can also have a negative
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performance impact due to the overhead of the many required system
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calls. It is thus recommended to use these settings only when testing
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tests to identify performance bottlenecks. For calculations with few
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atoms or a very large number of processors, even the <em>normal</em> setting
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can have a measurable negative performance impact. In those cases you
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can just use the <em>loop</em> or <em>off</em> setting.</p>
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</div>
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</div>
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<div class="section" id="restrictions">
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<h2>Restrictions<a class="headerlink" href="#restrictions" title="Permalink to this headline">¶</a></h2>
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<blockquote>
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<div>none</div></blockquote>
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</div>
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<div class="section" id="related-commands">
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<h2>Related commands<a class="headerlink" href="#related-commands" title="Permalink to this headline">¶</a></h2>
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<p><a class="reference internal" href="run.html"><em>run post no</em></a>, <a class="reference internal" href="kspace_modify.html"><em>kspace_modify fftbench</em></a></p>
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</div>
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<div class="section" id="default">
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<h2>Default<a class="headerlink" href="#default" title="Permalink to this headline">¶</a></h2>
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<p>timer normal nosync</p>
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