Latency numbers every programmer should know

latency.txt

                                              ns
L1 cache reference .......................... 0.5
Branch mispredict ........................... 5
L2 cache reference .......................... 7
Mutex lock/unlock .......................... 25
Main memory reference ..................... 100
Compress 1K bytes with Zippy ............ 3,000
Send 2K bytes over 1 Gbps network ...... 20,000
Read 1 MB sequentially from memory .... 250,000
Round trip within same datacenter ..... 500,000
Disk seek .......................... 10,000,000
Read 1 MB sequentially from disk ... 20,000,000
Send packet CA->Netherlands->CA ... 150,000,000

:)