Benchmark.js helper for node

What it does

It is a very simple wrapper around benchmark.js and more specifically the Benchmark.Suite with the following additional functionality.

• Adds support for pre run setup for each iteration of a test
• Uses beautify-benchmark to produce nicer output and status updates
• Throws on error halting the benchmark

Installation

npm install --save-dev benchmarkjs-helper

Usage

Pass an object containing the test functions you wish to benchmarkjs-helper and it will handle passing them to benchmark.js and creating useful console output of the results. The keys are used as the name for the test in the report that is created.

const benchIt = require('benchmarkjs-helper')

benchIt({
	add: () => {
		return 1 + 1
	},
	subtract: () => {
		return 1 - 1
	},
	multiply: () => {
		return 1 * 1
	},
	divide: () => {
		return 1 / 1
	},
})

Run it from the command line/terminal:

node examples/simple.js

Outputting something like the following except it is colourised (colorized) for easier reading by beautify-benchmark.

  4 tests completed.

  add      x 717,864,803 ops/sec ±1.87% (83 runs sampled)
  subtract x 721,117,181 ops/sec ±1.81% (82 runs sampled)
  multiply x 791,720,133 ops/sec ±0.65% (97 runs sampled)
  divide   x 757,457,709 ops/sec ±1.66% (85 runs sampled)

In this case multiply is the winner and would be highlighted in green.

setupEach()

You can do some up front work to seed each function with its own data set without affecting the benchmark. This is useful for tests like the one in examples/setupEach/setupEach.js where you only want to test one aspect of a data structure (deletion) and not the initial creation. Your application could be delete heavy.

To use this feature you would define the object passed to benchmarkjs-helper slightly differently (it is important that setupEach is given a full JavaScript function and not an arrow function as this is used internally):

benchIt({
	add: {
		setupEach: () => {
			return [1, 1] // becomes x in `fn` below
		},
		fn: x => {
			return x[0] + x[1] // evaluates to 1 + 1
		},
	},
	multiply: {
		setupEach: () => {
			return [1, 1] // becomes x in `fn` below
		},
		fn: x => {
			return x[0] * x[1] // evaluates to 1 * 1
		},
	},
})

Credits

Mostly this project does nothing and all the real work is done by:

• benchmark.js
• beautify-benchmark

Licence

Apache 2.0