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<h4 class="subsection">4.3.1 Asynchronous writing</h4>
<p><a name="index-idleTime-211"></a><a name="index-maxObjectsWhenIdle-212"></a><a name="index-maxWriteoutWhenIdle-213"></a>
When Polipo runs out of memory (see <a href="Limiting-memory-usage.html#Limiting-memory-usage">Limiting memory usage</a>), it
will start discarding instances from its memory cache. If a disk
cache has been configured, it will write out any instance that it
discards. Any memory allocation that prompted the purge must then
wait for the write to complete.
<p>In order to avoid the latency hit that this causes, Polipo will
preemptively write out instances to the disk cache whenever it is
idle. The integer <code>idleTime</code> specifies the time during which
Polipo will remain idle before it starts writing out random objects to
the on-disk cache; this value defaults to 20<span class="dmn">s</span>. You may want to
decrease this value for a busy cache with little memory, or increase
it if your cache is often idle and has a lot of memory.
<p>The value <code>maxObjectsWhenIdle</code> (default 32) specifies the maximum
number of instances that an idle Polipo will write out without
checking whether there's any new work to do. The value
<code>maxWriteoutWhenIdle</code> specifies the maximum amount of data
(default 64<span class="dmn">kB</span>) that Polipo will write out without checking for
new activity. Increasing these values will make asynchronous
write-out slightly faster, at the cost of possibly increasing Polipo's
latency in some rare circumstances.
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