Anh Tran anhtran

On Tue Oct 27, 2015, history.state.gov began buckling under load, intermittently issuing 500 errors. Nginx's error log was sprinkled with the following errors:

2015/10/27 21:48:36 [crit] 2475#0: accept4() failed (24: Too many open files)

2015/10/27 21:48:36 [alert] 2475#0: *7163915 socket() failed (24: Too many open files) while connecting to upstream...

An article at http://www.cyberciti.biz/faq/linux-unix-nginx-too-many-open-files/ provided directions that mostly worked. Below are the steps we followed. The steps that diverged from the article's directions are marked with an *.

* Instead of using su to run ulimit on the nginx account, use ps aux | grep nginx to locate nginx's process IDs. Then query each process's file handle limits using cat /proc/pid/limits (where pid is the process id retrieved from ps). (Note: sudo may be necessary on your system for the cat command here, depending on your system.)
Added fs.file-max = 70000 to /etc/sysctl.conf

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

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.

Prolog

Google Chrome Developers says:

The new WOFF 2.0 Web Font compression format offers a 30% average gain over WOFF 1.0 (up to 50%+ in some cases). WOFF 2.0 is available since Chrome 36 and Opera 23.

Some examples of file size differences: WOFF vs. WOFF2

TTF to WOFF2 converting

http://www.fontsquirrel.com/tools/webfont-generator

Moved to git repository: https://github.com/denji/nginx-tuning

NGINX Tuning For Best Performance

For this configuration you can use web server you like, i decided, because i work mostly with it to use nginx.

Generally, properly configured nginx can handle up to 400K to 500K requests per second (clustered), most what i saw is 50K to 80K (non-clustered) requests per second and 30% CPU load, course, this was 2 x Intel Xeon with HyperThreading enabled, but it can work without problem on slower machines.

You must understand that this config is used in testing environment and not in production so you will need to find a way to implement most of those features best possible for your servers.

	#!/bin/bash

	PARAMS=('-m 6 -q 70 -mt -af -progress')

	if [ $# -ne 0 ]; then
	PARAMS=$@;
	fi

	cd $(pwd)

	var gulp = require('gulp');
	var babel = require("gulp-babel");
	var sourcemaps = require('gulp-sourcemaps');
	var concat = require('gulp-concat');
	var uglify = require('gulp-uglify');

	gulp.task('default', () => {
	return gulp.src('js/main.js')
	.pipe(sourcemaps.init())
	.pipe(babel({

	#!/usr/bin/env python
	# encoding: utf-8

	import lxml.etree
	import lxml.html
	import requests

	xml_sample = """<?xml version="1.0" encoding="UTF-8"?>
	<foo:Results xmlns:foo="http://www.foo.com" xmlns="http://www.bah.com">
	<foo:Recordset setCount="2">

	/**
	* Changes value to past tense.
	* Simple filter does not support irregular verbs such as eat-ate, fly-flew, etc.
	* http://jsfiddle.net/bryan_k/0xczme2r/
	*
	* @param {String} value The value string.
	*/
	Vue.filter('past-tense', function(value) {
	// Slightly follows http://www.oxforddictionaries.com/us/words/verb-tenses-adding-ed-and-ing
	var vowels = ['a', 'e', 'i', 'o', 'u'];

	$ cd /usr/local/src
	$ wget http://www.python.org/ftp/python/3.4.0/Python-3.4.0b2.tgz
	$ tar -xzf Python-3.4.0b2.tgz Python-3.4.0b2
	$ cd Python-3.4.0b2
	$ ./configure --enable-shared --prefix=/usr/local
	$ make
	$ make altinstall


	$ python3.4