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@kamaljoshi
kamaljoshi / check_cloudflare.rb
Last active May 27, 2017 21:57
This script collects domains from your Chrome history for the default profile and checks to see if they are being proxied through Cloudflare by checking presence of a header.
# Except sqlite3 all the libraries are standard that should be present with a Ruby installation.
# If you don't have sqlite3 installed. Use `gem install sqlite3`
require 'fileutils'
require 'sqlite3'
require 'uri'
require 'net/http'
require 'set'
require 'thread'
@piscisaureus
piscisaureus / pr.md
Created August 13, 2012 16:12
Checkout github pull requests locally

Locate the section for your github remote in the .git/config file. It looks like this:

[remote "origin"]
	fetch = +refs/heads/*:refs/remotes/origin/*
	url = git@github.com:joyent/node.git

Now add the line fetch = +refs/pull/*/head:refs/remotes/origin/pr/* to this section. Obviously, change the github url to match your project's URL. It ends up looking like this:

@jboner
jboner / latency.txt
Last active May 28, 2024 15:01
Latency Numbers Every Programmer Should Know
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