Comparing the performance of generating 32-bit and 53-bit random numbers using the hat package vs the node.js built-in crypto module

crypto_vs_hat.coffee

crypto = require 'crypto'
hat = require 'hat'

hatRandom32 = -> +hat(32, 10)
cryptoRandom32 = ->
  buffer = crypto.randomBytes(4)
  buffer.readUInt32LE(0)

hatRandom53 = -> +hat(53, 10)
cryptoRandom53 = ->
  buffer = crypto.randomBytes(8)
  lower = buffer.readUInt32LE(0)
  upper = buffer.readUInt32LE(4)
  lower + (upper & 0x1FFFFF) * 4294967296

randomBufferSize = 512
randomBuffer = null
randomBufferOffset = randomBufferSize

bufferredCryptoRandom32 = ->
  if randomBufferOffset is randomBufferSize
    randomBufferOffset = 0
    randomBuffer = crypto.randomBytes randomBufferSize
  returnValue = randomBuffer.readUInt32LE randomBufferOffset
  randomBufferOffset += 4
  returnValue

bufferredCryptoRandom53 = ->
  lower = bufferredCryptoRandom32()
  upper = bufferredCryptoRandom32()
  lower + (upper & 0x1FFFFF) * 4294967296

benchmark = (iterations, code)->
  t0 = process.hrtime()
  for i in [1..iterations]
    code()
  t1 = process.hrtime()

  (t1[0] - t0[0]) * 1e9 + t1[1] - t1[0]

iterations = 10000000

console.log ['version    ', process.versions.node]
console.log ['hat32      ', benchmark(iterations, hatRandom32) / iterations]
console.log ['crypto32   ', benchmark(iterations, cryptoRandom32) / iterations]
console.log ['bufferred32', benchmark(iterations, bufferredCryptoRandom32) / iterations]

console.log ['hat53      ', benchmark(iterations, hatRandom53) / iterations]
console.log ['crypto53   ', benchmark(iterations, cryptoRandom53) / iterations]
console.log ['bufferred53', benchmark(iterations, bufferredCryptoRandom53) / iterations]

results_node424.txt

[ 'version    ', '4.2.4' ]
[ 'hat32      ',  694.3685562 ]
[ 'crypto32   ', 2040.4403699 ]
[ 'bufferred32',  131.2481266 ]
[ 'hat53      ',  982.3463352 ]
[ 'crypto53   ', 2034.880742 ]
[ 'bufferred53',  215.1741097 ]

results_node432.txt

[ 'version    ', '4.3.2' ]
[ 'hat32      ',  662.5748487 ]
[ 'crypto32   ', 2164.7982519 ]
[ 'bufferred32',  155.8228151 ]
[ 'hat53      ', 1036.7472657 ]
[ 'crypto53   ', 2123.8128307 ]
[ 'bufferred53',  199.8784631 ]

results_node441.txt

[ 'version    ', '4.4.1' ]
[ 'hat32      ',  715.8293629 ]
[ 'crypto32   ', 2030.0373721 ]
[ 'bufferred32',  126.3828921 ]
[ 'hat53      ',  975.0403035 ]
[ 'crypto53   ', 2104.9618644 ]
[ 'bufferred53',  190.0091236 ]

results_node591.txt

[ 'version    ', '5.9.1' ]
[ 'hat32      ',  670.3050681 ]
[ 'crypto32   ', 1934.4135479 ]
[ 'bufferred32',  122.491949 ]
[ 'hat53      ',  969.8403003 ]
[ 'crypto53   ', 1947.8109037 ]
[ 'bufferred53',  223.7892894 ]