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class="sidebar-search-container" method="get" action="search.html" role="search"> <input class="sidebar-search" placeholder="Search" name="q" aria-label="Search"> <input type="hidden" name="check_keywords" value="yes"> <input type="hidden" name="area" value="default"> </form> <div id="searchbox"></div><div class="sidebar-scroll"><div class="sidebar-tree"> <ul class="current"> <li class="toctree-l1"><a class="reference internal" href="install.html">Installation and Requirements</a></li> <li class="toctree-l1 has-children"><a class="reference internal" href="changelog.html">Changelog</a><input class="toctree-checkbox" id="toctree-checkbox-1" name="toctree-checkbox-1" role="switch" type="checkbox"/><label for="toctree-checkbox-1"><div class="visually-hidden">Toggle navigation of Changelog</div><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></label><ul> <li class="toctree-l2"><a class="reference internal" href="changelog_1_5.html">Changes for 1.5</a></li> <li class="toctree-l2"><a class="reference internal" href="changelog_1_4.html">Changes for 1.4</a></li> <li class="toctree-l2"><a class="reference internal" href="changelog_1_3.html">Changes for 1.3</a></li> <li class="toctree-l2"><a class="reference internal" href="changelog_1_2.html">Changes for 1.2</a></li> <li class="toctree-l2"><a class="reference internal" href="changelog_1_1.html">Changes for 1.1</a></li> <li class="toctree-l2"><a class="reference internal" href="changelog_1_0.html">Changes for 1.0</a></li> <li class="toctree-l2"><a class="reference internal" href="changelog_pre.html">Changes before gevent 1.0</a></li> </ul> </li> <li class="toctree-l1"><a class="reference internal" href="intro.html">Introduction</a></li> <li class="toctree-l1"><a class="reference internal" href="api/gevent.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent</span></code> – common functions</a></li> <li class="toctree-l1"><a class="reference internal" href="api/gevent.greenlet.html">Greenlet Objects</a></li> <li class="toctree-l1"><a class="reference internal" href="servers.html">Implementing servers</a></li> <li class="toctree-l1 has-children"><a class="reference internal" href="dns.html">Name Resolution (DNS)</a><input class="toctree-checkbox" id="toctree-checkbox-2" name="toctree-checkbox-2" role="switch" type="checkbox"/><label for="toctree-checkbox-2"><div class="visually-hidden">Toggle navigation of Name Resolution (DNS)</div><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></label><ul> <li class="toctree-l2"><a class="reference internal" href="api/gevent.resolver.thread.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.resolver.thread</span></code> – thread based hostname resolver</a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.resolver.ares.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.resolver.ares</span></code> – c-ares based hostname resolver</a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.resolver.dnspython.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.resolver.dnspython</span></code> – Pure Python hostname resolver</a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.resolver.blocking.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.resolver.blocking</span></code> – Non-cooperative resolver</a></li> </ul> </li> <li class="toctree-l1 current current-page"><a class="current reference internal" href="#">Monitoring and Debugging gevent Applications</a></li> <li class="toctree-l1"><a class="reference internal" href="loop_impls.html">Event Loop Implementations: libuv and libev</a></li> <li class="toctree-l1"><a class="reference internal" href="configuration.html">Configuring gevent</a></li> </ul> <ul> <li class="toctree-l1 has-children"><a class="reference internal" href="api/index.html">API reference</a><input class="toctree-checkbox" id="toctree-checkbox-3" name="toctree-checkbox-3" role="switch" type="checkbox"/><label for="toctree-checkbox-3"><div class="visually-hidden">Toggle navigation of API reference</div><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></label><ul> <li class="toctree-l2"><a class="reference internal" href="api/gevent.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent</span></code> – common functions</a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.timeout.html">Cooperative Timeouts Using <code class="docutils literal notranslate"><span class="pre">gevent.Timeout</span></code></a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.greenlet.html">Greenlet Objects</a></li> <li class="toctree-l2 has-children"><a class="reference internal" href="api/gevent.socket.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.socket</span></code> – Cooperative low-level networking interface</a><input class="toctree-checkbox" id="toctree-checkbox-4" name="toctree-checkbox-4" role="switch" type="checkbox"/><label for="toctree-checkbox-4"><div class="visually-hidden">Toggle navigation of gevent.socket – Cooperative low-level networking interface</div><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></label><ul> <li class="toctree-l3"><a class="reference internal" href="api/gevent._socket3.html">Python 3 interface</a></li> </ul> </li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.ssl.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.ssl</span></code> – Secure Sockets Layer (SSL/TLS) module</a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.select.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.select</span></code> – Waiting for I/O completion</a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.selectors.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.selectors</span></code> – High-level IO Multiplexing</a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.event.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.event</span></code> – Notifications of multiple listeners</a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.queue.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.queue</span></code> – Synchronized queues</a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.local.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.local</span></code> – Greenlet-local objects</a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.lock.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.lock</span></code> – Locking primitives</a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.hub.html"><code class="docutils literal notranslate"><span class="pre">gevent.hub</span></code> - The Event Loop and the Hub</a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.core.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.core</span></code> - (deprecated) event loop abstraction</a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent</span></code> – common functions</a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.backdoor.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.backdoor</span></code> – Interactive greenlet-based network console that can be used in any process</a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.baseserver.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.baseserver</span></code> – Base class for implementing servers</a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.builtins.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.builtins</span></code> – gevent friendly implementations of builtin functions</a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.contextvars.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.contextvars</span></code> – Cooperative <code class="docutils literal notranslate"><span class="pre">contextvars</span></code></a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.core.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.core</span></code> - (deprecated) event loop abstraction</a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.event.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.event</span></code> – Notifications of multiple listeners</a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.events.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.events</span></code> – Publish/subscribe event infrastructure</a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.exceptions.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.exceptions</span></code> – Exceptions</a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.fileobject.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.fileobject</span></code> – Wrappers to make file-like objects cooperative</a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.hub.html"><code class="docutils literal notranslate"><span class="pre">gevent.hub</span></code> - The Event Loop and the Hub</a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.local.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.local</span></code> – Greenlet-local objects</a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.lock.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.lock</span></code> – Locking primitives</a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.monkey.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.monkey</span></code> – Make the standard library cooperative</a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.os.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.os</span></code> – Low-level operating system functions from <code class="xref py py-mod docutils literal notranslate"><span class="pre">os</span></code></a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.pool.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.pool</span></code> – Managing greenlets in a group</a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.pywsgi.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.pywsgi</span></code> – A pure-Python, gevent-friendly WSGI server</a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.queue.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.queue</span></code> – Synchronized queues</a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.resolver.ares.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.resolver.ares</span></code> – c-ares based hostname resolver</a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.resolver.blocking.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.resolver.blocking</span></code> – Non-cooperative resolver</a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.resolver.dnspython.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.resolver.dnspython</span></code> – Pure Python hostname resolver</a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.resolver.thread.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.resolver.thread</span></code> – thread based hostname resolver</a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.select.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.select</span></code> – Waiting for I/O completion</a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.selectors.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.selectors</span></code> – High-level IO Multiplexing</a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.server.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.server</span></code> – TCP/SSL server</a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.signal.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.signal</span></code> – Cooperative implementation of special cases of <code class="xref py py-func docutils literal notranslate"><span class="pre">signal.signal()</span></code></a></li> <li class="toctree-l2 has-children"><a class="reference internal" href="api/gevent.socket.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.socket</span></code> – Cooperative low-level networking interface</a><input class="toctree-checkbox" id="toctree-checkbox-5" name="toctree-checkbox-5" role="switch" type="checkbox"/><label for="toctree-checkbox-5"><div class="visually-hidden">Toggle navigation of gevent.socket – Cooperative low-level networking interface</div><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></label><ul> <li class="toctree-l3"><a class="reference internal" href="api/gevent._socket3.html">Python 3 interface</a></li> </ul> </li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.ssl.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.ssl</span></code> – Secure Sockets Layer (SSL/TLS) module</a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.subprocess.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.subprocess</span></code> – Cooperative <code class="docutils literal notranslate"><span class="pre">subprocess</span></code> module</a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.thread.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.thread</span></code> – Implementation of the standard <code class="xref py py-mod docutils literal notranslate"><span class="pre">thread</span></code> module that spawns greenlets</a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.threading.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.threading</span></code> – Implementation of the standard <code class="xref py py-mod docutils literal notranslate"><span class="pre">threading</span></code> using greenlets</a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.threadpool.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.threadpool</span></code> - A pool of native threads</a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.time.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.time</span></code> – Makes <em>sleep</em> gevent aware</a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.util.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.util</span></code> – Low-level utilities</a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.ares.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.ares</span></code> – Backwards compatibility alias for <code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.resolver.cares</span></code></a></li> <li class="toctree-l2"><a class="reference internal" href="api/gevent.wsgi.html"><code class="docutils literal notranslate"><span class="pre">gevent.wsgi</span></code> – Historical note only; does not exist</a></li> <li class="toctree-l2 has-children"><a class="reference internal" href="examples/index.html">Examples</a><input class="toctree-checkbox" id="toctree-checkbox-6" name="toctree-checkbox-6" role="switch" type="checkbox"/><label for="toctree-checkbox-6"><div class="visually-hidden">Toggle navigation of Examples</div><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></label><ul> <li class="toctree-l3"><a class="reference internal" href="examples/concurrent_download.html">Example concurrent_download.py</a></li> <li class="toctree-l3"><a class="reference internal" href="examples/dns_mass_resolve.html">Example dns_mass_resolve.py</a></li> <li class="toctree-l3"><a class="reference internal" href="examples/echoserver.html">Example echoserver.py</a></li> <li class="toctree-l3"><a class="reference internal" href="examples/geventsendfile.html">Example geventsendfile.py</a></li> <li class="toctree-l3"><a class="reference internal" href="examples/portforwarder.html">Example portforwarder.py</a></li> <li class="toctree-l3"><a class="reference internal" href="examples/processes.html">Example processes.py</a></li> <li class="toctree-l3"><a class="reference internal" href="examples/psycopg2_pool.html">Example psycopg2_pool.py</a></li> <li class="toctree-l3"><a class="reference internal" href="examples/threadpool.html">Example threadpool.py</a></li> <li class="toctree-l3"><a class="reference internal" href="examples/udp_client.html">Example udp_client.py</a></li> <li class="toctree-l3"><a class="reference internal" href="examples/udp_server.html">Example udp_server.py</a></li> <li class="toctree-l3"><a class="reference internal" href="examples/unixsocket_client.html">Example unixsocket_client.py</a></li> <li class="toctree-l3"><a class="reference internal" href="examples/unixsocket_server.html">Example unixsocket_server.py</a></li> <li class="toctree-l3"><a class="reference internal" href="examples/webproxy.html">Example webproxy.py</a></li> <li class="toctree-l3"><a class="reference internal" href="examples/webpy.html">Example webpy.py</a></li> <li class="toctree-l3"><a class="reference internal" href="examples/wsgiserver.html">Example wsgiserver.py</a></li> <li class="toctree-l3"><a class="reference internal" href="examples/wsgiserver_ssl.html">Example wsgiserver_ssl.py</a></li> </ul> </li> </ul> </li> </ul> <ul> <li class="toctree-l1 has-children"><a class="reference internal" href="development/index.html">Development</a><input class="toctree-checkbox" id="toctree-checkbox-7" name="toctree-checkbox-7" role="switch" type="checkbox"/><label for="toctree-checkbox-7"><div class="visually-hidden">Toggle navigation of Development</div><i 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Beginning with version 1.3, gevent has special support for monitoring such applications and getting visibility into them.</p> <div class="admonition tip"> <p class="admonition-title">Tip</p> <p>For some additional tools, see the comments on <a class="reference external" href="https://github.com/gevent/gevent/issues/1021">issue 1021</a>.</p> </div> <section id="the-monitor-thread"> <h2>The Monitor Thread<a class="headerlink" href="#the-monitor-thread" title="Link to this heading">¶</a></h2> <p>gevent can be <a class="reference internal" href="configuration.html#gevent._config.Config.monitor_thread" title="gevent._config.Config.monitor_thread"><code class="xref py py-attr docutils literal notranslate"><span class="pre">configured</span></code></a> to start a native thread to watch over each hub it creates. Out of the box, that thread has support to watch two things, but you can <a class="reference internal" href="api/gevent.events.html#gevent.events.IPeriodicMonitorThread.add_monitoring_function" title="gevent.events.IPeriodicMonitorThread.add_monitoring_function"><code class="xref py py-func docutils literal notranslate"><span class="pre">add</span> <span class="pre">your</span> <span class="pre">own</span> <span class="pre">functions</span></code></a> to be called periodically in this thread.</p> <section id="blocking"> <h3>Blocking<a class="headerlink" href="#blocking" title="Link to this heading">¶</a></h3> <p>When the monitor thread is enabled, by default it will watch for greenlets that block the event loop for longer than a <a class="reference internal" href="configuration.html#gevent._config.Config.max_blocking_time" title="gevent._config.Config.max_blocking_time"><code class="xref py py-attr docutils literal notranslate"><span class="pre">configurable</span></code></a> time interval. When such a blocking greenlet is detected, it will print <a class="reference internal" href="api/gevent.util.html#gevent.util.format_run_info" title="gevent.util.format_run_info"><code class="xref py py-func docutils literal notranslate"><span class="pre">a</span> <span class="pre">report</span></code></a> to the hub’s <a class="reference internal" href="api/gevent.hub.html#gevent.hub.Hub.exception_stream" title="gevent.hub.Hub.exception_stream"><code class="xref py py-attr docutils literal notranslate"><span class="pre">exception_stream</span></code></a>. It will also emit the <a class="reference internal" href="api/gevent.events.html#gevent.events.EventLoopBlocked" title="gevent.events.EventLoopBlocked"><code class="xref py py-class docutils literal notranslate"><span class="pre">gevent.events.EventLoopBlocked</span></code></a> event.</p> <div class="admonition seealso"> <p class="admonition-title">See also</p> <p><a class="reference internal" href="api/gevent.util.html#gevent.util.assert_switches" title="gevent.util.assert_switches"><code class="xref py py-func docutils literal notranslate"><span class="pre">gevent.util.assert_switches()</span></code></a></p> <p>For a scoped version of this.</p> </div> </section> <section id="memory-usage"> <h3>Memory Usage<a class="headerlink" href="#memory-usage" title="Link to this heading">¶</a></h3> <p>Optionally, you can set a <a class="reference internal" href="configuration.html#gevent._config.Config.max_memory_usage" title="gevent._config.Config.max_memory_usage"><code class="xref py py-attr docutils literal notranslate"><span class="pre">memory</span> <span class="pre">limit</span></code></a>. The monitor thread will check the process’s memory usage every <a class="reference internal" href="configuration.html#gevent._config.Config.memory_monitor_period" title="gevent._config.Config.memory_monitor_period"><code class="xref py py-attr docutils literal notranslate"><span class="pre">memory_monitor_period</span></code></a> seconds, and if it is found to exceed this value, the <a class="reference internal" href="api/gevent.events.html#gevent.events.MemoryUsageThresholdExceeded" title="gevent.events.MemoryUsageThresholdExceeded"><code class="xref py py-class docutils literal notranslate"><span class="pre">gevent.events.MemoryUsageThresholdExceeded</span></code></a> event will be emitted. If in the future memory usage declines below the configured value, the <a class="reference internal" href="api/gevent.events.html#gevent.events.MemoryUsageUnderThreshold" title="gevent.events.MemoryUsageUnderThreshold"><code class="xref py py-class docutils literal notranslate"><span class="pre">gevent.events.MemoryUsageUnderThreshold</span></code></a> event will be emitted.</p> <div class="admonition important"> <p class="admonition-title">Important</p> <p><a class="reference external" href="https://pypi.org/project/psutil">psutil</a> must be installed to monitor memory usage.</p> </div> </section> </section> <section id="visibility"> <h2>Visibility<a class="headerlink" href="#visibility" title="Link to this heading">¶</a></h2> <div class="admonition tip"> <p class="admonition-title">Tip</p> <p>Insight into the monkey-patching process can be obtained by observing the events <a class="reference internal" href="api/gevent.monkey.html#module-gevent.monkey" title="gevent.monkey"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.monkey</span></code></a> emits.</p> </div> <p>It is sometimes useful to get an overview of all existing greenlets and their stack traces. The function <a class="reference internal" href="api/gevent.util.html#gevent.util.print_run_info" title="gevent.util.print_run_info"><code class="xref py py-func docutils literal notranslate"><span class="pre">gevent.util.print_run_info()</span></code></a> will collect this info and print it (<a class="reference internal" href="api/gevent.util.html#gevent.util.format_run_info" title="gevent.util.format_run_info"><code class="xref py py-func docutils literal notranslate"><span class="pre">gevent.util.format_run_info()</span></code></a> only collects and returns this information). The greenlets are organized into a tree based on the greenlet that spawned them.</p> <p>The <code class="docutils literal notranslate"><span class="pre">print_run_info</span></code> function is commonly hooked up to a signal handler to get the application state at any given time.</p> <p>For each greenlet the following information is printed:</p> <ul class="simple"> <li><p>Its current execution stack</p></li> <li><p>If it is not running, its termination status and <a class="reference internal" href="api/gevent.greenlet.html#gevent.Greenlet.value" title="gevent.Greenlet.value"><code class="xref py py-attr docutils literal notranslate"><span class="pre">gevent.Greenlet.value</span></code></a> or <a class="reference internal" href="api/gevent.greenlet.html#gevent.Greenlet.exception" title="gevent.Greenlet.exception"><code class="xref py py-attr docutils literal notranslate"><span class="pre">gevent.Greenlet.exception</span></code></a></p></li> <li><p>The <a class="reference internal" href="api/gevent.greenlet.html#gevent.Greenlet.spawning_stack" title="gevent.Greenlet.spawning_stack"><code class="xref py py-attr docutils literal notranslate"><span class="pre">stack</span> <span class="pre">at</span> <span class="pre">which</span> <span class="pre">it</span> <span class="pre">was</span> <span class="pre">spawned</span></code></a></p></li> <li><p>Its parent (usually the hub)</p></li> <li><p>Its <a class="reference internal" href="api/gevent.greenlet.html#gevent.Greenlet.minimal_ident" title="gevent.Greenlet.minimal_ident"><code class="xref py py-attr docutils literal notranslate"><span class="pre">minimal_ident</span></code></a></p></li> <li><p>Its <a class="reference internal" href="api/gevent.greenlet.html#gevent.Greenlet.name" title="gevent.Greenlet.name"><code class="xref py py-attr docutils literal notranslate"><span class="pre">name</span></code></a></p></li> <li><p>The <a class="reference internal" href="api/gevent.greenlet.html#gevent.Greenlet.spawn_tree_locals" title="gevent.Greenlet.spawn_tree_locals"><code class="xref py py-attr docutils literal notranslate"><span class="pre">spawn</span> <span class="pre">tree</span> <span class="pre">locals</span></code></a> (only for the root of the spawn tree).</p></li> <li><p>The dicts of all <a class="reference internal" href="api/gevent.local.html#gevent.local.local" title="gevent.local.local"><code class="xref py py-class docutils literal notranslate"><span class="pre">gevent.local.local</span></code></a> objects that are used in the greenlet.</p></li> </ul> <p>The greenlet tree itself is represented as an object that you can also use for your own purposes: <a class="reference internal" href="api/gevent.util.html#gevent.util.GreenletTree" title="gevent.util.GreenletTree"><code class="xref py py-class docutils literal notranslate"><span class="pre">gevent.util.GreenletTree</span></code></a>.</p> </section> <section id="profiling"> <h2>Profiling<a class="headerlink" href="#profiling" title="Link to this heading">¶</a></h2> <p>The github repository <a class="reference external" href="https://github.com/nylas/nylas-perftools">nylas/nylas-perftools</a> has some gevent-compatible profilers.</p> <ul class="simple"> <li><p><code class="docutils literal notranslate"><span class="pre">stacksampler</span></code> is a sampling profiler meant to be run in a greenlet in your server process and exposes data through an HTTP server; it is designed to be suitable for production usage.</p></li> <li><p><code class="docutils literal notranslate"><span class="pre">py2devtools</span></code> is a greenlet-aware tracing profiler that outputs data that can be used by the Chrome dev tools; it is intended for developer usage.</p></li> </ul> </section> </section> </article> </div> <footer> <div class="related-pages"> <a class="next-page" href="loop_impls.html"> <div class="page-info"> <div class="context"> <span>Next</span> </div> <div class="title">Event Loop Implementations: libuv and libev</div> </div> <svg class="furo-related-icon"><use href="#svg-arrow-right"></use></svg> </a> <a class="prev-page" href="api/gevent.resolver.blocking.html"> <svg class="furo-related-icon"><use href="#svg-arrow-right"></use></svg> <div class="page-info"> <div class="context"> <span>Previous</span> </div> <div class="title"><code class="xref py py-mod docutils literal notranslate"><span class="pre">gevent.resolver.blocking</span></code> – Non-cooperative resolver</div> </div> </a> </div> <div class="bottom-of-page"> <div class="left-details"> <div class="copyright"> Copyright © 2009-2023, gevent contributors </div> Made with <a href="https://www.sphinx-doc.org/">Sphinx</a> and <a class="muted-link" href="https://pradyunsg.me">@pradyunsg</a>'s <a href="https://github.com/pradyunsg/furo">Furo</a> </div> <div class="right-details"> </div> </div> </footer> </div> <aside class="toc-drawer"> <div class="toc-sticky toc-scroll"> <div class="toc-title-container"> <span class="toc-title"> On this page </span> </div> <div class="toc-tree-container"> <div class="toc-tree"> <ul> <li><a class="reference internal" href="#">Monitoring and Debugging gevent Applications</a><ul> <li><a class="reference internal" href="#the-monitor-thread">The Monitor Thread</a><ul> <li><a class="reference internal" href="#blocking">Blocking</a></li> <li><a class="reference internal" href="#memory-usage">Memory Usage</a></li> </ul> </li> <li><a class="reference internal" href="#visibility">Visibility</a></li> <li><a class="reference internal" href="#profiling">Profiling</a></li> </ul> </li> </ul> </div> </div> </div> </aside> </div> </div><script src="_static/documentation_options.js?v=32fdf4fc"></script> <script src="_static/doctools.js?v=9bcbadda"></script> <script src="_static/sphinx_highlight.js?v=dc90522c"></script> <script src="_static/scripts/furo.js?v=5fa4622c"></script> </body> </html>