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<h4 class="subsection">5.3.2 Limiting object usage</h4>
<p><a name="index-objectHighMark-238"></a><a name="index-publicObjectLowMark-239"></a><a name="index-objectHashTableSize-240"></a>
Besides limiting chunk usage, it is possible to limit Polipo's memory
usage by bounding the number of objects it keeps in memory at any given
time. This is done with <code>objectHighMark</code> and
<code>publicObjectLowMark</code>.
<p>The value <code>objectHighMark</code> is the absolute maximum of objects
held in memory (including resources and server addresses). When the
number of in-memory objects that haven't been superseded yet falls
below <code>publicObjectLowMark</code>, Polipo will stop writing out objects
to disk (superseded objects are discarded as soon as possible).
<p>On 32-bit architectures, every object costs 108 bytes of memory, plus
storage for every globally unique header that is not handled specially
(hopefully negligible), plus an overhead of one word (4 bytes) for
every chunk of data in the object.
<p>You may also want to change <code>objectHashTableSize</code>. This is the
size of the hash table used for holding objects; it should be a power
of two and defaults to eight times <code>objectHighMark</code>. Increasing
this value will reduce the number of objects being written out to disk
due to hash table collisions. Every hash table entry costs one word.
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