Numbers Everyone Should Know

Numbers.txt

- 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
 
From http://www.cs.cornell.edu/projects/ladis2009/talks/dean-keynote-ladis2009.pdf