Robin Howlett robinhowlett

Thread Pools

Thread pools on the JVM should usually be divided into the following three categories:

Each of these categories has a different optimal configuration and usage pattern.

	/*

	To use:
	* save this script as migrate.js
	* fill in the user/pass variables at the top
	* save the block of json below as package.json right next to it
	* install node.js from nodejs.org
	* run 'npm install' from the directory where you saved the files
	* run 'node migrate.js'
	* profit

	Latency Comparison Numbers (~2012)
	----------------------------------
	L1 cache reference 0.5 ns
	Branch mispredict 5 ns
	L2 cache reference 7 ns 14x L1 cache
	Mutex lock/unlock 25 ns
	Main memory reference 100 ns 20x L2 cache, 200x L1 cache
	Compress 1K bytes with Zippy 3,000 ns 3 us
	Send 1K bytes over 1 Gbps network 10,000 ns 10 us
	Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD

	window.HAL = {}

	class HAL.Model extends Backbone.Model
	constructor: (attrs) ->
	super @parse(_.clone attrs)

	parse: (attrs = {}) ->
	@links = attrs._links \|\| {}
	delete attrs._links
	@embedded = attrs._embedded \|\| {}