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  <section id="statistics">
<span id="users-guide-statistics"></span><h1>Statistics<a class="headerlink" href="#statistics" title="Link to this heading">¶</a></h1>
<p>Varnish comes with a couple of nifty and very useful statistics generating tools that generates statistics in real time by constantly updating and presenting a specific dataset by aggregating and analyzing logdata from the shared memory logs.</p>
<section id="varnishtop">
<h2>varnishtop<a class="headerlink" href="#varnishtop" title="Link to this heading">¶</a></h2>
<p>The <a class="reference internal" href="../reference/varnishtop.html#varnishtop-1"><span class="std std-ref">varnishtop</span></a> utility reads the shared memory logs and presents a
continuously updated list of the most commonly occurring log entries.</p>
<p>With suitable filtering using the -I, -i, -X and -x options, it can be
used to display a ranking of requested documents, clients, user
agents, or any other information which is recorded in the log.</p>
<p><code class="docutils literal notranslate"><span class="pre">varnishtop</span> <span class="pre">-i</span> <span class="pre">ReqURL</span></code> will show you what URLs are being asked for by
the client. <code class="docutils literal notranslate"><span class="pre">varnishtop</span> <span class="pre">-i</span> <span class="pre">BereqURL</span></code> will show you what your backend
is being asked the most. <code class="docutils literal notranslate"><span class="pre">varnishtop</span> <span class="pre">-I</span> <span class="pre">ReqHeader:Accept-Encoding</span></code> will
show the most popular Accept-Encoding header the client are sending you.</p>
</section>
<section id="varnishhist">
<h2>varnishhist<a class="headerlink" href="#varnishhist" title="Link to this heading">¶</a></h2>
<p>The <a class="reference internal" href="../reference/varnishhist.html#varnishhist-1"><span class="std std-ref">varnishhist</span></a> utility reads <a class="reference internal" href="../reference/varnishd.html#varnishd-1"><span class="std std-ref">varnishd</span></a> shared
memory logs and presents a continuously updated histogram showing the
distribution of the last N requests by their processing.
The value of N and the vertical scale are displayed in the top left
corner.  The horizontal scale is logarithmic.  Hits are marked with a
pipe character (“|”), and misses are marked with a hash character (“#”).</p>
</section>
<section id="varnishstat">
<h2>varnishstat<a class="headerlink" href="#varnishstat" title="Link to this heading">¶</a></h2>
<p>Varnish has lots of counters. We count misses, hits, information about
the storage, threads created, deleted objects. Just about
everything. <a class="reference internal" href="../reference/varnishstat.html#varnishstat-1"><span class="std std-ref">varnishstat</span></a> will dump these counters. This is useful when
tuning Varnish.</p>
<p>There are programs that can poll <a class="reference internal" href="../reference/varnishstat.html#varnishstat-1"><span class="std std-ref">varnishstat</span></a> regularly and
make nice graphs of these counters. One such program is Munin. Munin
can be found at <a class="reference external" href="http://munin-monitoring.org/">http://munin-monitoring.org/</a> . There is a plugin for
munin in the Varnish source code.</p>
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<li><a class="reference internal" href="#">Statistics</a><ul>
<li><a class="reference internal" href="#varnishtop">varnishtop</a></li>
<li><a class="reference internal" href="#varnishhist">varnishhist</a></li>
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