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

yogthos

(ns tetris
  (:import
    (javax.swing JFrame)
    (java.awt Canvas Graphics Color Toolkit)    
    (java.awt.event ActionListener KeyListener KeyEvent))
  (:gen-class))

(def *cols* 10)
(def *rows* 20)
(def *width* 300)