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tomhostyn / latency.markdown
Last active October 29, 2022 13:21 — forked from hellerbarde/latency.markdown
Google NALSD prep

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 (-40%)....... 3,000 ns  =   3 µs
Send 1K bytes over 1 Gbps network ....... 10,000 ns  =  10 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs