Albin Kerouanton akerouanton

The introduction to Reactive Programming you've been missing

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

Nginx FastCGI response buffer sizes

By default when Nginx starts receiving a response from a FastCGI backend (such as PHP-FPM) it will buffer the response in memory before delivering it to the client. Any response larger than the set buffer size is saved to a temporary file on disk.

This process is outlined at the Nginx ngx_http_fastcgi_module page manual page.

Introduction
Determine actual FastCGI response sizes
Setting the buffer size
Verifying results

I was tired of Chrome eating all my laptop resources so I decided to put some limit to it with cgroup.

As I was using Ubuntu 12.04 with support for cgroup, I installed the package cgroup-bin and add the following group to the file /etc/cgconfig.conf:

group browsers {
    cpu {
#       Set the relative share of CPU resources equal to 25%
        cpu.shares = "256";
 }

Sass/Less Comparison

In this document I am using Sass's SCSS syntax. You can choose to use the indented syntax in sass, if you prefer it, it has no functional differences from the SCSS syntax.

For Less, I'm using the JavaScript version because this is what they suggest on the website. The ruby version may be different.

	#!/bin/bash

	# Put this file at: .git/hooks/post-checkout
	# and make it executable
	# You can install it system wide too, see http://stackoverflow.com/a/2293578/685587

	PREV_COMMIT=$1
	POST_COMMIT=$2

	NOCOLOR='\e[0m'

	<?php
	/*
	OCP - Opcache Control Panel (aka Zend Optimizer+ Control Panel for PHP)
	Author: _ck_ (with contributions by GK, stasilok)
	Version: 0.1.7
	Free for any kind of use or modification, I am not responsible for anything, please share your improvements

	* revision history
	0.1.7 2015-09-01 regex fix for PHP7 phpinfo
	0.1.6 2013-04-12 moved meta to footer so graphs can be higher and reduce clutter

	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

	# to generate your dhparam.pem file, run in the terminal
	openssl dhparam -out /etc/nginx/ssl/dhparam.pem 2048

Albin Kerouanton akerouanton

The introduction to Reactive Programming you've been missing

This tutorial as a series of videos

Nginx FastCGI response buffer sizes

Sass/Less Comparison

Variables