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@tonyseek
tonyseek / login-szu-ipv6.py
Last active December 14, 2015 17:49
The network setup script for Shenzhen University.
#!/usr/bin/env python
#-*- coding:utf-8 -*-
"""The login CLI for Shenzhen University IPv6.
"""
import argparse
import urllib
import getpass
import sys
@jakeonrails
jakeonrails / Ruby Notepad Bookmarklet
Created January 29, 2013 18:08
This bookmarklet gives you a code editor in your browser with a single click.
data:text/html, <style type="text/css">#e{position:absolute;top:0;right:0;bottom:0;left:0;}</style><div id="e"></div><script src="http://d1n0x3qji82z53.cloudfront.net/src-min-noconflict/ace.js" type="text/javascript" charset="utf-8"></script><script>var e=ace.edit("e");e.setTheme("ace/theme/monokai");e.getSession().setMode("ace/mode/ruby");</script>
@jboner
jboner / latency.txt
Last active April 12, 2025 08:42
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
:+1:
:-1:
:airplane:
:art:
:bear:
:beer:
:bike:
:bomb:
:book:
:bulb: