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When we’ve completed our review, we delete the trace data.
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With the user’s permission, the trace is securely uploaded to Slack’s servers, where engineers can inspect the trace and hopefully track down the underlying problem. When Slack receives a report of a performance issue in its desktop app, we ask the user to trigger a special command that collects a performance trace through the Chrome Tracing system (using the contentTracing API in Electron). It’s often impossible to exactly replicate a user’s environment to reproduce an issue they might be seeing. When you take into account all the factors that can have an effect on your app’s performance - OS version, CPU, GPU, memory, disk speed, network conditions, other currently running software, and so on- it turns out every desktop environment is as unique as a snowflake. For example, here’s the source for the LayerTreeHost::DoUpdateLayers annotation.
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In fact, if you click on the magnifying glass to the right of the event title in the info panel, you’ll be taken to the point in Chromium’s source code where that annotation is defined. These aren’t exactly stack traces - they’re performance-relevant events that Chromium developers have identified and annotated by hand. But by far the most common kind of data in here is produced by specifically annotated TRACE_EVENT code in Chromium. Chrome Tracing can fill this file with all sorts of useful information, from sampled stack traces of JavaScript code to network logging data and even screenshots of your page as it’s being (re-)rendered. If you click the ‘Save’ button in the top-left, you’ll get a file that you can open up in your favorite text editor - since it’s just JSON. Once your recording is complete and the data is loaded, you’ll be greeted by the delightfully candy-colored analysis interface. chrome://tracing can record a bewildering array of different kinds of data. Go ahead and click ‘Record’, select a category (or leave the default ‘Web Developer’ option selected), do something in Chrome, then come back to the tracing tab and click ‘Stop’. You can try it out for yourself right now by opening chrome://tracing in Chrome. At Slack, we use Chrome Tracing to diagnose complex performance issues, and hopefully after reading this, you’ll be able to as well.Ĭhrome Tracing consists of two important parts: first, a system for collecting performance-relevant information from the browser itself and second, a tool for inspecting and analyzing that information. Enter Chrome Tracing: a tool that’s built into Chrome (and Electron) that can collect a huge variety of detailed performance data.
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DevTools is fantastic, but there’s a lot of potentially useful information that the performance panel doesn’t capture. You might have used Chrome’s Developer Tools to profile your JavaScript to improve performance or find bottlenecks.