Yaniv Kessler kessler

Hidden classes in JavaScript and Inline Caching

Knowing how internals work is always a good. Pretty much for everything. Cars, trains, computers, you name it. It gives you an insight on what happens under the hood. You also act/react differently based on this knowledge.

As you might have guessed, it’s also true for web development. Knowledge of CSS transitions allows you to achieve better performance and not to use JavaScript in most cases. Knowledge of V8 internals allows you to write more performant JavaScript code. So let’s talk about V8 a little.

A little about V8

V8 is a JavaScript engine built by Google. Firefox built SpiderMonkey, Opera built Carakan and Microsoft built Chakra. One very important difference between V8 and other JavaScript engines is that V8 doesn’t generate any intermediate code. It compiles JavaScr

Better local require() paths for Node.js

Problem

When the directory structure of your Node.js application (not library!) has some depth, you end up with a lot of annoying relative paths in your require calls like:

const Article = require('../../../../app/models/article');

Those suck for maintenance and they're ugly.

Possible solutions

Backend Architectures

Twitter

ror, scala, jetty, erlang, thrift, mongrel, comet server, my-sql, memchached, varnish, kestrel(mq), starling, gizzard, cassandra, hadoop, vertica, munin, nagios, awstats

Introduce Gizzard of Twitter - 트위터의 새로운 분산 관리 라이브러리 Gizzard를 소개합니다.
The Architecture Twitter Uses to Deal with 150M Active Users, 300K QPS, a 22 MB/S Firehose, and Send Tweets in Under 5 Seconds
Scaling Twitter: Making Twitter 10000 Percent Faster

	setTimeout(function() {
	console.log('queue a print AFTER a second')
	}, 1000)

	setInterval(function() {
	console.log('queue a print EVERY second')
	}, 1000)

	setImmediate(function() {
	console.log('queue a print in the next event loop tick but after IO tasks are done')

	#!/bin/sh
	sudo /etc/init.d/iptables save
	sudo /etc/init.d/iptables stop
	sudo chkconfig iptables off

	sudo /etc/init.d/ip6tables save
	sudo /etc/init.d/ip6tables stop
	sudo chkconfig ip6tables off

	#!/bin/sh

	sub="/Applications/Sublime Text.app/Contents/SharedSupport/bin/subl"

	target=$1

	if [[ -z $target ]]
	then
	target=$(pwd)
	fi

	/**
	* Created by andy hulstkamp
	*/

	var webpage = require("webpage"),
	fs = require("fs");

	var debug = false,
	pageIndex = 0,
	allLinks = [],

	echo ec2-user soft nofile 999999 >> /etc/security/limits.conf
	echo ec2-user hard nofile 999999 >> /etc/security/limits.conf
	echo root soft nofile 999999 >> /etc/security/limits.conf
	echo root hard nofile 999999 >> /etc/security/limits.conf

	echo net.core.rmem_max = 33554432 >> /etc/sysctl.conf
	echo net.core.wmem_max = 33554432 >> /etc/sysctl.conf
	echo net.ipv4.tcp_rmem = 4096 16384 33554432 >> /etc/sysctl.conf
	echo net.ipv4.tcp_wmem = 4096 16384 33554432 >> /etc/sysctl.conf
	echo net.ipv4.tcp_mem = 786432 1048576 26777216 >> /etc/sysctl.conf

	#!/bin/sh
	NODE_BRANCH=v0.10.38-release

	sudo yum install -y make git gcc-c++
	echo 'sleeping for 2 seconds now...'
	sleep 2

	git clone https://github.com/joyent/node.git

	cd node

	sudo yum install gcc
	wget http://download.redis.io/redis-stable.tar.gz
	tar xvzf redis-stable.tar.gz
	cd redis-stable
	make
	sudo make install
	sudo mkdir /etc/redis
	sudo mkdir /var/redis

	sudo cp redis.conf /etc/redis/6379.conf