bigrig

Node Big Rig

Node Big Rig comes in two flavors:

1. A module for doing trace analysis inline to other tasks.
2. A CLI tool.

Both the module and CLI perform the same analysis as the web app, just without a UI. This makes it a good fit for use in CI environments, or as part of bigger workflows.

Installation

CLI

npm install -g bigrig

Module

npm install bigrig

Usage

CLI

To use the CLI you call bigrig and pass it the path to a trace file:

bigrig --file /path/to/trace.json

This will, by default, simply return a JSON string that you can parse or manipulate as you see fit.

If you wish to see a pretty printed version, add the --pretty-print flag:

bigrig --file /path/to/trace.json --pretty-print

You should then see a pretty printed output of the time breakdown for the trace.

Module

You can also use Big Rig's module as part of a wider workflow.

var bigrig = require('bigrig');
var fs = require('fs');

// Read trace file contents.
fs.readFile('/path/to/trace.json', 'utf8', function(err, data) {
  if (err)
    throw err;

  results = bigrig.analyze(data);

  // Now do something with the results, like
  // post to a dashboard.
});

Getting a trace

You can get a trace from:

• WebPagetest. Run your test with Chrome, and check "Capture Dev Tools Timeline" under the Chrome options. Download the timeline file (which is a trace file) and pass it to Big Rig.
• Chrome DevTools. Take a timeline recording, and then right click on the timeline, save the file, and pass it to Big Rig.
• Big Rig's Test Runner. This uses Chrome Driver under the hood, and will allow you to run an automated test (including for Android) and get back a trace file.

License

See /LICENSE

Owner

Paul Lewis - @aerotwist

Thanks

The tracing code is a manipulated version of Chrome's Trace Viewer. A huge thanks to the Chromium engineers for making it possible to analyze traces.

Please note: this is not an official Google product.