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<div class="section" id="environment-variables">
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<span id="env-vars"></span><h1>Environment Variables<a class="headerlink" href="#environment-variables" title="Permalink to this headline">¶</a></h1>
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<p>Eventlet’s behavior can be controlled by a few environment variables.
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These are only for the advanced user.</p>
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<p>EVENTLET_HUB</p>
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<blockquote>
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<div>Used to force Eventlet to use the specified hub instead of the
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optimal one. See <a class="reference internal" href="hubs.html#understanding-hubs"><span class="std std-ref">Understanding Eventlet Hubs</span></a> for the list of
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acceptable hubs and what they mean (note that picking a hub not on
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the list will silently fail). Equivalent to calling
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<a class="reference internal" href="hubs.html#eventlet.hubs.use_hub" title="eventlet.hubs.use_hub"><code class="xref py py-meth docutils literal"><span class="pre">eventlet.hubs.use_hub()</span></code></a> at the beginning of the program.</div></blockquote>
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<p>EVENTLET_THREADPOOL_SIZE</p>
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<div>The size of the threadpool in <a class="reference internal" href="threading.html#module-eventlet.tpool" title="eventlet.tpool"><code class="xref py py-mod docutils literal"><span class="pre">tpool</span></code></a>. This is an
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environment variable because tpool constructs its pool on first
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use, so any control of the pool size needs to happen before then.</div></blockquote>
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