hellerbarde

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

nateware

#
# Sample nginx.conf optimized for EC2 c1.medium to xlarge instances.
# Also look at the haproxy.conf file for how the backend is balanced.
#

user "nginx" "nginx";
worker_processes 10;

error_log  /var/log/nginx_error.log info;

reu

var redis = require("redis")
  , subscriber = redis.createClient()
  , publisher  = redis.createClient();

subscriber.on("message", function(channel, message) {
  console.log("Message '" + message + "' on channel '" + channel + "' arrived!")
});

subscriber.subscribe("test");

plentz

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

sseffa

#
# https://www.owasp.org/index.php/XSS_Filter_Evasion_Cheat_Sheet
# based on the RSnake original http://ha.ckers.org/xss.html
# Retrieved on 2013-11-20
# Much of this wildly obsolete
#

# XSS Locator 2
'';!--"<XSS>=&{()}

ykmm

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import urllib2
import pcap #requires the python-libpcap module

def libpcap_net_data(cap_file, net_iface, filter_expr=None):
    """A decorator that can be used to sniff network data for the duration of a function call
    if there is heavy traffic on the network interface the captured data will contain spurious packets
    not related to the function call

Aimeast

http://www-public.it-sudparis.eu/~maigron/RIR_Stats/index.html

RIR Delegations

These pages provide statistics on IP addresses and ASN numbers delegated by RIRs to each country in their geographic area. Delegation details for each country are also available.

These statistics are generated automatically from the RIRs delegation files available via FTP:

ftp://ftp.afrinic.net/pub/stats/afrinic/delegated-afrinic-extended-latest ftp://ftp.apnic.net/pub/stats/apnic/delegated-apnic-extended-latest

Vestride

Encoding Video

Installing

Install FFmpeg with homebrew. You'll need to install it with a couple flags for webm and the AAC audio codec.

brew install ffmpeg --with-libvpx --with-libvorbis --with-fdk-aac --with-opus

protrolium

ffmpeg

Converting Audio into Different Formats / Sample Rates

Minimal example: transcode from MP3 to WMA:
ffmpeg -i input.mp3 output.wma

You can get the list of supported formats with:
ffmpeg -formats

You can get the list of installed codecs with:

ericandrewlewis

Setting up a WordPress site on AWS

This tutorial walks through setting up AWS infrastructure for WordPress, starting at creating an AWS account. We'll manually provision a single EC2 instance (i.e an AWS virtual machine) to run WordPress using Nginx, PHP-FPM, and MySQL.

This tutorial assumes you're relatively comfortable on the command line and editing system configuration files. It is intended for folks who want a high-level of control and understanding of their infrastructure. It will take about half an hour if you don't Google away at some point.

If you experience any difficulties or have any feedback, leave a comment. 🐬

Coming soon: I'll write another tutorial on a high availability setup for WordPress on AWS, including load-balancing multiple application servers in an auto-scaling group and utilizing RDS.