Michael Prieß MPriess

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

	## Booting kernel from Legacy Image at 80000000 ...
	Image Name: Ubuntu Kernel
	Image Type: ARM Linux Kernel Image (uncompressed)
	Data Size: 3734736 Bytes = 3.6 MiB
	Load Address: 80008000
	Entry Point: 80008000
	Verifying Checksum ... OK
	## Loading init Ramdisk from Legacy Image at 81600000 ...
	Image Name: Ubuntu Initrd
	Image Type: ARM Linux RAMDisk Image (gzip compressed)

	Platte /dev/dm-0: 4082 MByte, 4082106368 Byte
	255 Köpfe, 63 Sektoren/Spur, 496 Zylinder
	Einheiten = Zylinder von 16065 × 512 = 8225280 Bytes
	Sector size (logical/physical): 512 bytes / 512 bytes
	I/O size (minimum/optimal): 512 bytes / 512 bytes
	Disk identifier: 0x00000000

	Gerät boot. Anfang Ende Blöcke Id System
	/dev/dm-0p1 * 1 9 72261 c W95 FAT32 (LBA)
	/dev/dm-0p2 10 496 3911827+ 83 Linux

	Bundle headers:
	Bnd-LastModified = 1324388798185
	Build-Jdk = 1.6.0_21
	Built-By = doe
	Bundle-Description = sqljdbc4-osgi
	Bundle-ManifestVersion = 2
	Bundle-Name = sqljdbc4-osgi
	Bundle-SymbolicName = com.microsoft.sqlserver.sqljdbc4-osgi
	Bundle-Version = 3.0.0
	Created-By = Apache Maven Bundle Plugin

	public class UnicodeSQLServerDialect extends SQLServerDialect {

	public UnicodeSQLServerDialect() {
	super();

	registerColumnType(Types.VARCHAR, 255, "nvarchar($l)");
	registerColumnType(Types.CHAR, "nchar(1)");
	registerColumnType(Types.CLOB, "nvarchar(max)");
	}
	}

	public class JUnitTest
	{
	private PGPoolingDataSource dataSource;

	@Before
	public void setup() {
	dataSource = new PGPoolingDataSource();
	dataSource.setServerName("localhost:5432/foo");
	dataSource.setUser("postgres");
	dataSource.setPassword("postgres");

	public FooWS getEndpoint() throws MalformedURLException {
	if (webservice == null) {

	FooWS client = new FooWSService(new URL(wsEndpoint)).getFooWSPort();

	if (timeout != -1)
	{
	Client cl = ClientProxy.getClient(client);

	HTTPConduit http = (HTTPConduit)cl.getConduit();

	function createFooLayer() {
	return new OpenLayers.Layer.Vector(" foo", {
	minZoomLevel: 7,
	maxZoomLevel: 10,
	styleMap: new OpenLayers.StyleMap(incidentStyle),
	strategies: [new OpenLayers.Strategy.BBOX()],
	protocol: new OpenLayers.Protocol.WFS({
	url: geoserverUrl,
	featureType: "foo",
	featureNS: "http://www.foo.com",

	<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
	"http://www.w3.org/TR/html4/loose.dtd">
	<html>
	<head>
	<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.1/jquery.min.js"></script>
	<script src="http://raw.github.com/jzaefferer/jquery-validation/1.11.1/jquery.validate.js"></script>
	<script src="http://raw.github.com/jzaefferer/jquery-validation/1.11.1/additional-methods.js"></script>
	</head>
	<body>

	input {
	log4j {
	port => 4712
	}
	}
	output {
	loggly {
	key => abcdef12-3456-7890-abcd-ef0123456789
	proxy_host => myproxy.com # string (optional)
	proxy_port => 8080 # number (optional)