Matt Kline mrkline

## summary
Original text here: https://whydavewhy.com/2013/08/16/loyalty-and-layoffs/

## latency.markdown

      
        
          
            
              
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                mrkline
                / latency.markdown
            
            
              Created
              May 23, 2014 13:46
                — forked from hellerbarde/latency.markdown
            
          
        
      
        
  
      
    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