jboner

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

ktheory

#!/usr/bin/env ruby

require 'rubygems'
require 'nokogiri'
require 'net/http'

# check_aws_status.rb
# A nagios plugin for fetching RSS feeds from http://status.aws.amazon.com.
# Source: https://gist.github.com/1604786
# Written by Aaron Suggs: https://github.com/ktheory