EventEmitter benchmarks

ee-emit-multi-args.js

var common = require('../common.js');
var EventEmitter = require('events').EventEmitter;

var bench = common.createBenchmark(main, {n: [25e5]});

function main(conf) {
  var n = conf.n | 0;

  var ee = new EventEmitter();
  var listeners = [];

  for (var k = 0; k < 10; k += 1)
    ee.on('dummy', function() {});

  bench.start();
  for (var i = 0; i < n; i += 1) {
    ee.emit('dummy', 5, true);
  }
  bench.end(n);
}

ee-emit.js

var common = require('../common.js');
var EventEmitter = require('events').EventEmitter;

var bench = common.createBenchmark(main, {n: [25e4]});

function main(conf) {
  var n = conf.n | 0;

  var ee = new EventEmitter();

  for (var k = 0; k < 10; k += 1)
    ee.on('dummy', function() {});

  bench.start();
  for (var i = 0; i < n; i += 1) {
    ee.emit('dummy');
  }
  bench.end(n);
}

ee-listener-count.js

var common = require('../common.js');
var EventEmitter = require('events').EventEmitter;

var bench = common.createBenchmark(main, {n: [25e4]});

function main(conf) {
  var n = conf.n | 0;

  var ee = new EventEmitter();
  var listenerCount = EventEmitter.listenerCount;

  for (var k = 0; k < 10; k += 1)
    ee.on('dummy', function() {});

  bench.start();
  for (var i = 0; i < n; i += 1) {
    var r = listenerCount(ee, 'dummy');
  }
  bench.end(n);
}

ee-listeners-many.js

var common = require('../common.js');
var EventEmitter = require('events').EventEmitter;

var bench = common.createBenchmark(main, {n: [25e4]});

function main(conf) {
  var n = conf.n | 0;

  var ee = new EventEmitter();
  ee.setMaxListeners(101);

  for (var k = 0; k < 100; k += 1)
    ee.on('dummy', function() {});

  bench.start();
  for (var i = 0; i < n; i += 1) {
    var r = ee.listeners('dummy');
  }
  bench.end(n);
}

ee-listeners.js

var common = require('../common.js');
var EventEmitter = require('events').EventEmitter;

var bench = common.createBenchmark(main, {n: [25e4]});

function main(conf) {
  var n = conf.n | 0;

  var ee = new EventEmitter();

  for (var k = 0; k < 10; k += 1)
    ee.on('dummy', function() {});

  bench.start();
  for (var i = 0; i < n; i += 1) {
    var r = ee.listeners('dummy');
  }
  bench.end(n);
}