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

robcowie

Create a Postgis timezone DB

See https://gist.github.com/3449216

Create a timezone db from shapefiles

$ curl -O http://efele.net/maps/tz/world/tz_world.zip
$ open tz_world.zip
$ cd world

allada

*M-UNKNOWN MEXICAN TRUCKING COMPANY
8CON	CONTSHIP CONTAINER LINE
99M	UNKNOWN MEXICAN OVERLAND CARRIER
AAAB	AAA MOTORS
AAAC	AAACTION TRANSPORTATION INC
AAAD	A A A DELIVERY INC
AAAG	ATC LOGISTICS INC
AAAO	AAMODT INC
AAAU	ASIA CONTAINER LEASING CO LTD
AAAW	AAA WALKER TRANSPORTATION SERVICES

taylor224

# -*- coding: utf-8 -*-

import wifi


def Search():
    wifilist = []

    cells = wifi.Cell.all('wlan0')