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<span id="plano-overview-threading"></span><h1>Threading Model<a @click.prevent="window.navigator.clipboard.writeText($el.href); $el.setAttribute('data-tooltip', 'Copied!'); setTimeout(() =&gt; $el.setAttribute('data-tooltip', 'Copy link to this element'), 2000)" aria-label="Copy link to this element" class="headerlink" data-tooltip="Copy link to this element" href="#threading-model"><svg height="1em" viewbox="0 0 24 24" width="1em" xmlns="http://www.w3.org/2000/svg"><path d="M3.9 12c0-1.71 1.39-3.1 3.1-3.1h4V7H7c-2.76 0-5 2.24-5 5s2.24 5 5 5h4v-1.9H7c-1.71 0-3.1-1.39-3.1-3.1zM8 13h8v-2H8v2zm9-6h-4v1.9h4c1.71 0 3.1 1.39 3.1 3.1s-1.39 3.1-3.1 3.1h-4V17h4c2.76 0 5-2.24 5-5s-2.24-5-5-5z"></path></svg></a></h1>
<p>Plano builds on top of Envoys single process with multiple threads architecture.</p>
<p>A single <em>primary</em> thread controls various sporadic coordination tasks while some number of <em>worker</em>
threads perform filtering, and forwarding.</p>
<p>Once a connection is accepted, the connection spends the rest of its lifetime bound to a single worker
thread. All the functionality around prompt handling from a downstream client is handled in a separate worker thread.
This allows the majority of Plano to be largely single threaded (embarrassingly parallel) with a small amount
of more complex code handling coordination between the worker threads.</p>
<p>Generally, Plano is written to be 100% non-blocking.</p>
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<p>For most workloads we recommend configuring the number of worker threads to be equal to the number of
hardware threads on the machine.</p>
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