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

MohamedAlaa

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

itsderek23

# docker build -t="rails" .

FROM ubuntu:12.04

RUN apt-get update

## MYSQL
RUN apt-get install -y -q mysql-client libmysqlclient-dev

## RUBY

L422Y

I have spent quite a bit of time figuring out automounts of NFS shares in OS X...

Somewhere along the line, Apple decided allowing mounts directly into /Volumes should not be possible:

/etc/auto_master (see last line):

#
# Automounter master map
#

+auto_master # Use directory service

fbeeper

Usable accent marks on MacOS Lion and above (including Yosemite!)

Since Mac OS Lion, default "press and hold" of keyboard keys brings an easy access to accents and special characters:

However, who designed the order of elements in these lists is CLEARLY NOT using them with enough frequency*. Depending with what vowel you invoke this tool, the order of diacritical mark is different:

a à á â ä æ ã å ā