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  • Committer: Package Import Robot
  • Author(s): Stig Sandbeck Mathisen
  • Date: 2011-10-29 15:23:24 UTC
  • mfrom: (0.1.15)
  • Revision ID: package-import@ubuntu.com-20111029152324-tdtlsurrv22ysknj
Tags: 3.0.2-1
* New upstream release
* Build from upstream tarball instead of git tag
* debian/watch: more specific regular expression

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doc/sphinx/=build/html/tutorial/sizing_your_cache.html
 
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
 
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  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 
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<html xmlns="http://www.w3.org/1999/xhtml">
 
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  <head>
 
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    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 
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    <title>Sizing your cache &mdash; Varnish version 3.0.2 documentation</title>
 
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    <link rel="stylesheet" href="../_static/default.css" type="text/css" />
 
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    <link rel="stylesheet" href="../_static/pygments.css" type="text/css" />
 
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    <script type="text/javascript">
 
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      var DOCUMENTATION_OPTIONS = {
 
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        URL_ROOT:    '../',
 
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        VERSION:     '3.0.2',
 
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        COLLAPSE_INDEX: false,
 
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        FILE_SUFFIX: '.html',
 
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        HAS_SOURCE:  true
 
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      };
 
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    </script>
 
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    <script type="text/javascript" src="../_static/jquery.js"></script>
 
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    <script type="text/javascript" src="../_static/underscore.js"></script>
 
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    <script type="text/javascript" src="../_static/doctools.js"></script>
 
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    <link rel="top" title="Varnish version 3.0.2 documentation" href="../index.html" />
 
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    <link rel="up" title="Using Varnish" href="index.html" />
 
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    <link rel="next" title="Put Varnish on port 80" href="putting_varnish_on_port_80.html" />
 
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    <link rel="prev" title="Logging in Varnish" href="logging.html" /> 
 
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  </head>
 
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  <body>
 
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    <div class="related">
 
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      <h3>Navigation</h3>
 
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      <ul>
 
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        <li class="right" style="margin-right: 10px">
 
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          <a href="../genindex.html" title="General Index"
 
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             accesskey="I">index</a></li>
 
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        <li class="right" >
 
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          <a href="putting_varnish_on_port_80.html" title="Put Varnish on port 80"
 
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             accesskey="N">next</a> |</li>
 
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        <li class="right" >
 
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          <a href="logging.html" title="Logging in Varnish"
 
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             accesskey="P">previous</a> |</li>
 
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        <li><a href="../index.html">Varnish version 3.0.2 documentation</a> &raquo;</li>
 
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          <li><a href="index.html" accesskey="U">Using Varnish</a> &raquo;</li> 
 
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      </ul>
 
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    </div>  
 
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    <div class="document">
 
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      <div class="documentwrapper">
 
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        <div class="bodywrapper">
 
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          <div class="body">
 
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  <div class="section" id="sizing-your-cache">
 
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<h1>Sizing your cache<a class="headerlink" href="#sizing-your-cache" title="Permalink to this headline">¶</a></h1>
 
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<p>Picking how much memory you should give Varnish can be a tricky
 
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task. A few things to consider:</p>
 
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<blockquote>
 
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<div><ul class="simple">
 
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<li>How big is your <em>hot</em> data set. For a portal or news site that
 
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would be the size of the front page with all the stuff on it, and
 
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the size of all the pages and objects linked from the first page.</li>
 
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<li>How expensive is it to generate an object? Sometimes it makes sense
 
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to only cache images a little while or not to cache them at all if
 
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they are cheap to serve from the backend and you have a limited
 
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amount of memory.</li>
 
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<li>Watch the n_lru_nuked counter with <a class="reference internal" href="../reference/varnishstat.html#reference-varnishstat"><em>varnishstat</em></a> or some other
 
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tool. If you have a lot of LRU activity then your cache is evicting
 
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objects due to space constraints and you should consider increasing
 
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the size of the cache.</li>
 
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</ul>
 
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</div></blockquote>
 
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<p>Be aware that every object that is stored also carries overhead that
 
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is kept outside the actually storage area. So, even if you specify -s
 
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malloc,16G varnish might actually use <strong>double</strong> that. Varnish has a
 
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overhead of about 1k per object. So, if you have lots of small objects
 
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in your cache the overhead might be significant.</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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      <div class="sphinxsidebar">
 
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        <div class="sphinxsidebarwrapper">
 
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  <h4>Previous topic</h4>
 
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  <p class="topless"><a href="logging.html"
 
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                        title="previous chapter">Logging in Varnish</a></p>
 
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  <h4>Next topic</h4>
 
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  <p class="topless"><a href="putting_varnish_on_port_80.html"
 
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                        title="next chapter">Put Varnish on port 80</a></p>
 
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  <h3>This Page</h3>
 
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  <ul class="this-page-menu">
 
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    <li><a href="../_sources/tutorial/sizing_your_cache.txt"
 
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           rel="nofollow">Show Source</a></li>
 
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  </ul>
 
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<div id="searchbox" style="display: none">
 
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  <h3>Quick search</h3>
 
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    <form class="search" action="../search.html" method="get">
 
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      <input type="text" name="q" size="18" />
 
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      <input type="submit" value="Go" />
 
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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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    <p class="searchtip" style="font-size: 90%">
 
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    Enter search terms or a module, class or function name.
 
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    </p>
 
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</div>
 
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<script type="text/javascript">$('#searchbox').show(0);</script>
 
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        </div>
 
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      </div>
 
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      <div class="clearer"></div>
 
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    </div>
 
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    <div class="related">
 
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      <h3>Navigation</h3>
 
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      <ul>
 
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        <li class="right" style="margin-right: 10px">
 
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          <a href="../genindex.html" title="General Index"
 
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             >index</a></li>
 
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        <li class="right" >
 
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          <a href="putting_varnish_on_port_80.html" title="Put Varnish on port 80"
 
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             >next</a> |</li>
 
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        <li class="right" >
 
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          <a href="logging.html" title="Logging in Varnish"
 
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             >previous</a> |</li>
 
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        <li><a href="../index.html">Varnish version 3.0.2 documentation</a> &raquo;</li>
 
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          <li><a href="index.html" >Using Varnish</a> &raquo;</li> 
 
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      </ul>
 
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    </div>
 
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    <div class="footer">
 
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        &copy; Copyright 2010, Varnish Project.
 
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      Created using <a href="http://sphinx.pocoo.org/">Sphinx</a> 1.0.7.
 
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    </div>
 
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  </body>
 
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</html>
 
 
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