Nikolai Zujev jaymecd

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

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

Benchmarking Nginx with Go

There are a lot of ways to serve a Go HTTP application. The best choices depend on each use case. Currently nginx looks to be the standard web server for every new project even though there are other great web servers as well. However, how much is the overhead of serving a Go application behind an nginx server? Do we need some nginx features (vhosts, load balancing, cache, etc) or can you serve directly from Go? If you need nginx, what is the fastest connection mechanism? This are the kind of questions I'm intended to answer here. The purpose of this benchmark is not to tell that Go is faster or slower than nginx. That would be stupid.

So, these are the different settings we are going to compare:

Go HTTP standalone (as the control group)
Nginx proxy to Go HTTP
Nginx fastcgi to Go TCP FastCGI
Nginx fastcgi to Go Unix Socket FastCGI

About this article will do the following things:

Install & Setup
Write a simple Router
Zephir rewritten version
Extension installation and testing

Installation

Create PDF files from Markdown sources in OSX

When [Markdown][markdown] appeared more than 10 years ago, it aimed to make it easier to express ideas in an easy-to-write plain text format. It offers a simple syntax that takes the writer focus away from the formatting, thus giving her time to focus on the actual content.

The market abunds of editors to be used for help with markdown. After a few attempts, I settled to Sublime and its browser preview plugin, which work great for me and have a small memory footprint to accomplish that. To pass the results around to other people, less technical, a markdown file and a bunch of images is not the best approach, so converting it to a more robust format like PDF seems like a much better choice.

[Pandoc][pandoc] is the swiss-army knife of converting documents between various formats. While being able to deal with heavy-weight formats like docx and epub, we will need it for the more lightweight markdown. To be able to generate PDF files, we need LaTeX. On OSX, the s

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

	<?php

	class VersioningHook
	{
	public function beforeSendingResponse(Req $request, Res $response)
	{
	$version = $request->headers->get('version');
	$eventName = "api-v$version.response"

	$this->eventDispatcher->dispatch($eventName, array(

	# this config needs haproxy-1.1.28 or haproxy-1.2.1

	global
	log 127.0.0.1 local0
	maxconn 10000
	uid 99
	gid 99
	daemon

	defaults

	global
	maxconn 300
	log 192.168.0.40 local0 debug
	stats socket /tmp/haproxy.socket level admin
	gid 80
	nbproc 1
	chroot /var/empty
	daemon
	#
	# Example configuration for HAProxy 1.5-dev19 for using SNI

	radon# cat /etc/systemd/system/mongodb.service
	[Unit]
	Description=MongoDB Server
	Wants=network.target
	After=network.target

	[Service]
	Type=simple
	ExecStart=/usr/bin/mongod --config /etc/mongodb.conf
	User=mongodb