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<h1>Node.js v9.11.2 Documentation</h1>
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<li><span class="stability_undefined"><a href="#tracing_tracing">Tracing</a></span></li>
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<h1>Tracing<span><a class="mark" href="#tracing_tracing" id="tracing_tracing">#</a></span></h1>
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<p>Trace Event provides a mechanism to centralize tracing information generated by
V8, Node core, and userspace code.</p>
<p>Tracing can be enabled by passing the <code>--trace-events-enabled</code> flag when
starting a Node.js application.</p>
<p>The set of categories for which traces are recorded can be specified using the
<code>--trace-event-categories</code> flag followed by a list of comma separated category
names. By default the <code>node</code>, <code>node.async_hooks</code>, and <code>v8</code> categories are
enabled.</p>
<pre><code class="lang-txt">node --trace-events-enabled --trace-event-categories v8,node,node.async_hooks server.js
</code></pre>
<p>Running Node.js with tracing enabled will produce log files that can be opened
in the <a href="https://www.chromium.org/developers/how-tos/trace-event-profiling-tool"><code>chrome://tracing</code></a>
tab of Chrome.</p>
<p>The logging file is by default called <code>node_trace.${rotation}.log</code>, where
<code>${rotation}</code> is an incrementing log-rotation id. The filepath pattern can
be specified with <code>--trace-event-file-pattern</code> that accepts a template
string that supports <code>${rotation}</code> and <code>${pid}</code>. For example:</p>
<pre><code class="lang-txt">node --trace-events-enabled --trace-event-file-pattern '${pid}-${rotation}.log' server.js
</code></pre>
<p>Starting with Node 10.0.0, the tracing system uses the same time source as the
one used by <code>process.hrtime()</code> however the trace-event timestamps are expressed
in microseconds, unlike <code>process.hrtime()</code> which returns nanoseconds.</p>
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