Howard 1a57danc3

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

tmux cheatsheet

As configured in my dotfiles.

start new:

tmux

start new with session name:

	# coding: utf-8
	import os
	import bottle
	import requests
	import PyRSS2Gen as gen
	from datetime import timedelta, datetime
	from multiprocessing.dummy import Pool
	import urllib
	import json

	# /etc/nginx/sites-available/fanfou.shellex.info
	# 这儿假设的域名是 fanfou.shellex.info
	# 请替换为实际的域名

	server {
	resolver 8.8.8.8;
	listen 443;
	server_name fanfou.shellex.info;

	ssl on;

	html::-webkit-scrollbar {
	background-color:#d6d6d6;
	}
	html::-webkit-scrollbar {
	width:13px;
	height:13px;
	}
	html::-webkit-scrollbar-button {
	display:none;
	}