Srigi srigi

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

Open Conference Expectations

This document lays out some baseline expectations between conference speakers and conference presenters. The general goal is to maximize the value the conference provides to its attendees and community and to let speakers know what they might reasonably expect from a conference.

We believe that all speakers should reasonably expect these things, not just speakers who are known to draw large crowds, because no one is a rockstar but more people should have the chance to be one. We believe that conferences are better -- and, dare we say, more diverse -- when the people speaking are not just the people who can afford to get themselves there, either because their company paid or they foot the bill themselves. Basically, this isn't a rock show rider, it's some ideas that should help get the voices of lesser known folks heard.

These expectations should serve as a starting point for discussion between speaker and organizer. They are not a list of demands; they are a list of rea

Ruby, RVM and Mountain Lion

Key problems

Mountain Lion (10.8) has three main difference compared to Lion (10.7):

XCode 4.4 does not install Command Line Tools by default
X11 isn't available anymore
The installed version of OpenSSL has some bugs

How to work around

Locate the section for your github remote in the .git/config file. It looks like this:

[remote "origin"]
	fetch = +refs/heads/*:refs/remotes/origin/*
	url = [email protected]:joyent/node.git

Now add the line fetch = +refs/pull/*/head:refs/remotes/origin/pr/* to this section. Obviously, change the github url to match your project's URL. It ends up looking like this:

	<?php

	abstract class BaseModel extends Nette\Object
	{
	/** @var NotORM */
	protected $connection;



	/**

	#!/usr/bin/env python
	# -- coding: utf-8 --
	import datetime
	from pyquery import PyQuery as pq

	doc = pq(url='http://www.jinakrajina.cz/cz/poledni-menu')
	noms = doc.find('td > p')
	print '\n%s'%noms[0].text_content()[2:]
	for i,nom in enumerate(noms[1:-1:2],1):
	print '[%d] %s'%(i,nom.text_content().strip())

	export PS1="\u:\W $ "

	#GIT bash by HABR (modified by Dundee)
	export PSORIG="$PS1"

	function GITBRANCH() {
	BRANCH="$(git branch 2>/dev/null \| grep '*' \| cut -d" " -f2-)"
	if [ -n "$BRANCH" ] ; then
	export PS1="\u:\W "
	export PS1=$PS1$(echo -en "\[\033[00;37m\]$BRANCH \[\033[00m\]")

	# inconsistent

	# behavior in a class
	class A
	foo: ->
	el.addEventListener 'click', @bar
	bar: =>
	# the class instance, ideal but a special case for the fat arrow
	console.log(@)

	<?php

	/**
	* @author Filip Procházka <[email protected]>
	*/
	abstract class BasePresenter extends Nette\Application\UI\Presenter
	{

	/**
	* @var \Img\ImagePipe

	# used by Git (commit messages, rebase, ...)
	export EDITOR=vim