Operation latency

From:
https://fusiontables.google.com/DataSource?snapid=S523155yioc
Latency numbers every programmer should knowJeff Dean (http://research.google.com/people/jeff/)

operation   latency (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