rocket.chat.mqtt/node_modules/hashlru/bench.js

It's a MQTT Server, using redis to scale horizontally.

var Stats = require('statistics/mutate')
var LRU = require('./')

//simple benchmarks, and measure standard deviation

function run (N, op, init) {
  var stats = null, value
  for(var j = 0; j < 100; j++) {
    if(init) value = init(j)
    var start = Date.now()
    for(var i = 0; i < N; i++) op(value, i)
    stats = Stats(stats, N/((Date.now() - start)))
  }
  return stats
}

//set 1000 random items, then read 10000 items.
//since they are random, there will be misses as well as hits
console.log('GET', run(100000, function (lru, n) {
  lru.get(~~(Math.random()*1000))
//  lru.set(n, Math.random())
}, function () {
  var lru = LRU(1000)
  for(var i = 0; i ++ ; i < 1000)
    lru.set(~~(Math.random()*1000), Math.random())
  return lru
}))

//set 100000 random values into LRU for 1000 values.
//this means 99/100 should be evictions
console.log('SET', run(100000, function (lru, n) {
  lru.set(~~(Math.random()*100000), Math.random())
}, function () {
  return LRU(1000)
}))