v8-profiler-sunburst

V8 Profiler Sunburst

Here one can find example usage on using v8-profiler module for Node.js and generating sunburst charts.

Quickstart

Install v8-profiler:

npm install v8-profiler

Include profilev8.js as part of your program:

require('./profilev8.js')()

Now run your program.

This will start profiling and do process.exit when it is done. By default it runs after 5 seconds and stops after 15 seconds. Profile file will be written to the same place your main script is being located (__dirname).

Example

index.js

const http = require('http')

const server = http.createServer((req, res) => {
  res.end('hello\n')
})

server.listen(3000, 'localhost', () => {
  console.log('Server running')
})

require('./profilev8.js')()

Now run it as:

PROFILE_TIMEOUT=60000 node index.js

After 60 seconds you can find a json profile file in the same directory like 1528548297831.profile.

Now you can use an http server to serve the profile.html or open it directly depending on how your browser is configured:

To open locally enter this as url:

file:///path/to/file/profile.html?1528534695870.profile

Profile file has to be at the same location where profile.html is.

If using http-server:

npm install -g http-server
http-server -p 3333 .

Then you can find it at http://localhost:3333/profile.html?1528534695870.profile.

You can hover over elements and click on them to zoom in/out and get more details.