Nafis Khan nafisk

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

Semantic Commit Messages

See how a minor change to your commit message style can make you a better programmer.

Format: <type>(<scope>): <subject>

<scope> is optional

	# Be nice to your computer
	alias please='sudo'
	alias plz='sudo'

	# file managing stuff
	alias r="PYTHONOPTIMIZE=1 /usr/bin/ranger"
	alias l='ls'
	alias perm='stat -c %a'

	# Dogit

Nafis Khan nafisk

Latency numbers every programmer should know

Semantic Commit Messages

Example