Blixt blixt

Testing RNGs with Dieharder

This guide is specifically for pseudo-random number generators (PRNGs) written in JavaScript, and tested in Mac OS X.

Homebrew

	var pocket = require('pocket');

	// Traits just need to implement an interface and can be instances or singletons (see anonymous trait below for
	// interface).
	var controller = require('./traits/controller');
	var health = require('./traits/health');
	var score = require('./traits/score');
	var verlet = require('./traits/verlet');

	var player = pocket.entity({name: 'Blixt'});

	var procedural = require('procedural');

	var avatar = procedural('avatar')
	// The block size is just visual, so it shouldn't affect randomization.
	.doNotHash('blockSize')
	// The username is needed to create a unique avatar for every user.
	.takes('username')
	// Size, in blocks. Different sizes will create different avatars.
	.takes('size', function validate(avatar, blocks) {
	// Ensure that size is a positive integer divisible by 2.

	./randout.js --prng Procedural --count 500000000 > proc-alea2.txt && dieharder -g 202 -f proc-alea2.txt -a
	#=============================================================================#
	# dieharder version 3.31.1 Copyright 2003 Robert G. Brown #
	#=============================================================================#
	rng_name \| filename \|rands/second\|
	file_input\| proc-alea2.txt\| 3.77e+06 \|
	#=============================================================================#
	test_name \|ntup\| tsamples \|psamples\| p-value \|Assessment
	#=============================================================================#
	diehard_birthdays\| 0\| 100\| 100\|0.09460678\| PASSED

	<!DOCTYPE html>
	<html>
	<head><meta charset="utf-8"><title>asm.js</title></head>
	<body>
	<script>
	function murmurhash3(stdlib, foreign, heap) {
	"use asm";

	var int32 = new stdlib.Int32Array(heap);

	#=============================================================================#
	# dieharder version 3.31.1 Copyright 2003 Robert G. Brown #
	#=============================================================================#
	rng_name \| filename \|rands/second\|
	file_input\| alea.txt\| 3.72e+06 \|
	#=============================================================================#
	test_name \|ntup\| tsamples \|psamples\| p-value \|Assessment
	#=============================================================================#
	# The file file_input was rewound 1 times
	diehard_birthdays\| 0\| 100\| 100\|0.91201959\| PASSED

	var avatar = procedural('avatar')
	.takes('username')
	// Size, in blocks.
	.takes('size', function validate(avatar, blocks) {
	return typeof blocks == 'number' && blocks > 0;
	})
	// The pixel size of a single (square) block.
	.takes('blockSize', function validate(avatar, px) {
	return typeof px == 'number' && px > 0;
	})

	// NOTICE 2020-04-18
	// Please see the comments below about why this is not a great PRNG.

	// Read summary by @bryc here:
	// https://github.com/bryc/code/blob/master/jshash/PRNGs.md

	// Have a look at js-arbit which uses Alea:
	// https://github.com/blixt/js-arbit

	/**

	var fnv = require('fnv-plus');
	for (var i = 0; i < 100; i++)
	console.log(fnv.hash(i.toString(), 32).value);