It's color-coded so you can focus on the most saturated orange bars first. Now open the flame graph file in your favorite browser and watch it burn.
GRAPH BUILDER JAVASCRIPT INSTALL
Install stackvis if not yet installed npm i -g stackvis It's useful to apply some cleanup for a more readable graph Run perf script > perfs.out to generate the data file you'll visualize in a moment.
Run node with perf enabled (see perf output issues for tips specific to Node.js versions) perf record -e cycles:u -g - node -perf-basic-prof app.jsĭisregard warnings unless they're saying you can't run perf due to missing packages you may get some warnings about not being able to access kernel module samples which you're not after anyway. Try running perf - it might complain about missing kernel modules, install them too Install perf (usually available through the linux-tools-common package if not already installed) If you want to understand each step better, take a look at the sections that follow where we go into more detail. The purpose of this guide is to show steps involved in creating a flame graph and keep you in control of each step. Create a flame graph with system perf tools If you want a single step that produces a flame graph locally, try 0xįor diagnosing production deployments, read these notes: 0x production servers. While it's the most powerful way to visualize CPU time spent, it may have issues with how JavaScript code is optimized in Node.js 8 and above. Solaris vms are no longer needed for flame graphs!įlame graphs are generated from perf output, which is not a node-specific tool. You might have heard creating a flame graph for Node.js is difficult, but that's not true (anymore). They can help you pin down where you spend too much time doing synchronous operations. Flame Graphs What's a flame graph useful for?įlame graphs are a way of visualizing CPU time spent in functions.
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