Liu HellMagic

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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

#Linux Cheat Sheet

##File Commands:

ls – directory listing
ls -al – formatted listing with hidden files
cd dir - change directory to dir
cd – change to home
pwd – show current directory
mkdir dir – create a directory dir
rm file – delete file

Node.js - npm Cheat Sheet

(Full description and list of commands at - https://npmjs.org/doc/index.html)

List of less common (however useful) NPM commands

Prepand ./bin to your $PATH

Make sure to export your local $PATH and prepand relative ./node_modules/.bin/:

mkdir -p /usr/local/etc/nginx/sites-{enabled,available}
cd /usr/local/etc/nginx/sites-enabled
ln -s ../sites-available/default.conf
ln -s ../sites-available/default-ssl.conf

File locations:

nginx.conf to /usr/local/etc/nginx/
default.conf and default-ssl.conf to /usr/local/etc/nginx/sites-available
homebrew.mxcl.nginx.plist to /Library/LaunchDaemons/

People

`:bowtie:`	😄 `:smile:`	😆 `:laughing:`
😊 `:blush:`	😃 `:smiley:`	☺️ `:relaxed:`
😏 `:smirk:`	😍 `:heart_eyes:`	😘 `:kissing_heart:`
😚 `:kissing_closed_eyes:`	😳 `:flushed:`	😌 `:relieved:`
😆 `:satisfied:`	😁 `:grin:`	😉 `:wink:`
😜 `:stuck_out_tongue_winking_eye:`	😝 `:stuck_out_tongue_closed_eyes:`	😀 `:grinning:`
😗 `:kissing:`	😙 `:kissing_smiling_eyes:`	😛 `:stuck_out_tongue:`

	# First install tmux
	brew install tmux

	# For mouse support (for switching panes and windows)
	# Only needed if you are using Terminal.app (iTerm has mouse support)
	Install http://www.culater.net/software/SIMBL/SIMBL.php
	Then install https://bitheap.org/mouseterm/

	# More on mouse support http://floriancrouzat.net/2010/07/run-tmux-with-mouse-support-in-mac-os-x-terminal-app/

	### INSTALLATION NOTES ###
	# 1. Install Homebrew (https://github.com/mxcl/homebrew)
	# 2. brew install zsh
	# 3. Install OhMyZsh (https://github.com/robbyrussell/oh-my-zsh)
	# 4. brew install reattach-to-user-namespace --wrap-pbcopy-pbpaste && brew link reattach-to-user-namespace
	# 5. Install iTerm2
	# 6. In iTerm2 preferences for your profile set:
	# Character Encoding: Unicode (UTF-8)
	# Report Terminal Type: xterm-256color
	# 7. Put itunesartist and itunestrack into PATH

	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

	// String utils
	//
	// resources:
	// -- mout, https://github.com/mout/mout/tree/master/src/string

	/**
	* "Safer" String.toLowerCase()
	*/
	function lowerCase(str) {
	return str.toLowerCase();