awnumar

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

awnumar

#!/usr/bin/python2

import requests

def fix_host(host):
    if ((not host.startswith("http://")) and (not host.startswith("https://"))):
        host = "http://" + host
    if (host.endswith("/")):
        host = host[:-1]
    return host