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Next: <a rel="next" accesskey="n" href="Disk-cache.html#Disk-cache">Disk cache</a>,
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<h3 class="section">4.2 The in-memory cache</h3>
<p>The in-memory cache consists of a list of HTTP and DNS objects
maintained in least-recently used order. An index to the in-memory
cache is maintained as a (closed) hash table.
<p>When the in-memory cache grows beyond a certain size (controlled by a
number of variables, see <a href="Memory-usage.html#Memory-usage">Memory usage</a>), or when a hash table
collision occurs, resources are written out to disk.
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