[PJP]: Google Developers - Numbers Everyone Should Know

From "Google: Designs, Lessons and Advice from Building Large Distributed Systems":
Numbers Everyone 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
Send 2K bytes over 1 Gbps network ---- 20,000 ns
Read 1 MB sequentially from memory --- 250,000 ns
Round trip within same datacenter ------ 500,000 ns
Disk seek ------------------------------------- 10,000,000 ns
Read 1 MB sequentially from disk -------- 20,000,000 ns
Send packet CA->Netherlands->CA ----- 150,000,000 ns