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git-svn-id: svn://svn.icms.temple.edu/lammps-ro/trunk@14009 f3b2605a-c512-4ea7-a41b-209d697bcdaa
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@ -85,7 +85,7 @@ it gives quick access to documentation for all LAMMPS commands.
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.. toctree::
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:maxdepth: 2
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:numbered: // comment
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:numbered:
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Section_intro
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Section_start
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@ -105,8 +105,8 @@ it gives quick access to documentation for all LAMMPS commands.
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Indices and tables
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==================
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* :ref:`genindex` // comment
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* :ref:`search` // comment
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* :ref:`genindex`
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* :ref:`search`
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END_RST -->
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@ -0,0 +1,263 @@
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<!DOCTYPE html>
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<!--[if IE 8]><html class="no-js lt-ie9" lang="en" > <![endif]-->
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<!--[if gt IE 8]><!--> <html class="no-js" lang="en" > <!--<![endif]-->
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>timestep command — LAMMPS 15 May 2015 version documentation</title>
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<link rel="stylesheet" href="_static/css/theme.css" type="text/css" />
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<link rel="top" title="LAMMPS 15 May 2015 version documentation" href="index.html"/>
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<script src="_static/js/modernizr.min.js"></script>
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</head>
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<body class="wy-body-for-nav" role="document">
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<div class="wy-grid-for-nav">
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<nav data-toggle="wy-nav-shift" class="wy-nav-side">
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<div class="wy-side-nav-search">
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<a href="Manual.html" class="icon icon-home"> LAMMPS
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</a>
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<div role="search">
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<form id="rtd-search-form" class="wy-form" action="search.html" method="get">
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<input type="text" name="q" placeholder="Search docs" />
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<input type="hidden" name="check_keywords" value="yes" />
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<input type="hidden" name="area" value="default" />
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</form>
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</div>
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</div>
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<div class="wy-menu wy-menu-vertical" data-spy="affix" role="navigation" aria-label="main navigation">
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="Section_intro.html">1. Introduction</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Section_start.html">2. Getting Started</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Section_commands.html">3. Commands</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Section_packages.html">4. Packages</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Section_accelerate.html">5. Accelerating LAMMPS performance</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Section_howto.html">6. How-to discussions</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Section_example.html">7. Example problems</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Section_perf.html">8. Performance & scalability</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Section_tools.html">9. Additional tools</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Section_modify.html">10. Modifying & extending LAMMPS</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Section_python.html">11. Python interface to LAMMPS</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Section_errors.html">12. Errors</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Section_history.html">13. Future and history</a></li>
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</ul>
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</div>
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</nav>
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<section data-toggle="wy-nav-shift" class="wy-nav-content-wrap">
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<nav class="wy-nav-top" role="navigation" aria-label="top navigation">
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<i data-toggle="wy-nav-top" class="fa fa-bars"></i>
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<a href="Manual.html">LAMMPS</a>
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</nav>
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<div class="wy-nav-content">
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<div class="rst-content">
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<div role="navigation" aria-label="breadcrumbs navigation">
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<ul class="wy-breadcrumbs">
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<li><a href="Manual.html">Docs</a> »</li>
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<li>timestep command</li>
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<li class="wy-breadcrumbs-aside">
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<a href="http://lammps.sandia.gov">Website</a>
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<a href="Section_commands.html#comm">Commands</a>
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</li>
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</ul>
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<hr/>
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</div>
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<div role="main" class="document" itemscope="itemscope" itemtype="http://schema.org/Article">
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<div itemprop="articleBody">
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<div class="section" id="timestep-command">
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<span id="index-0"></span><h1>timestep command<a class="headerlink" href="#timestep-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>timers 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 and print 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 in 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 when collecting timer info (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>timers full sync
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timers 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 to which level of detail LAMMPS is performing internal profiling.</p>
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<p>During regular runs LAMMPS will collect information about how much time is
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spent in different sections of the code and thus can provide valuable
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information for determining performance and load imbalance problems. This
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can be done at different levels of detail and accuracy. For more
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information about the timing output, please have a look at the <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> setting
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will only measure the total time of run loop and not collect any detailed
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per section information. With the <em>normal</em> setting, timing information for
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individual sections of the code are collected and also information about
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load imbalances inside those sections presented. The <em>full</em> setting adds
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information about CPU utilization and thread utilization, when multi-threading
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is enabled.</p>
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<p>With the <em>sync</em> setting, all MPI tasks are synchronized at each timer call
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and thus allowing to study load imbalance more accuractly, but this usually
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has some performance impact. Using the <em>nosync</em> setting this can be turned
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off (which is the default).</p>
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<p>Multiple keywords can be provided and for keywords that are mutually
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exclusive, the last one in that group is taking 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 also can have a significant
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negative 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 making tests
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to identify the performance. For calculations with few atoms or a very
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large number of performance, even using the <em>normal</em> setting can have
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a measurable performance impact. It is recommended in those cases to use
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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>timers normal nosync</p>
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</div>
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</div>
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</div>
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</div>
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<footer>
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<hr/>
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<div role="contentinfo">
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<p>
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© Copyright .
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</p>
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