출처: http://brenocon.com/dean_perf.html
| action | ns | ms |
|---|---|---|
| L1 cache reference | 0.5 ns | |
| Branch mispredict | 5 ns | |
| L2 cache reference | 7 ns | |
| Mutex lock/unlock | 100 ns | |
| Main memory reference | 100 ns | |
| Compress 1K bytes with Zippy | 10,000 ns | 0.1 ms |
| Send 1K bytes over 1 Gbps network | 10,000 ns | 0.1 ms |
| Read 1 MB sequentially from memory | 250,000 ns | 0.25 ms |
| Round trip within same datacenter | 500,000 ns | 0.5 ms |
| Disk seek | 10,000,000 ns | 10 ms |
| Read 1 MB sequentially from network | 10,000,000 ns | 10 ms |
| Read 1 MB sequentially from disk | 30,000,000 ns | 30 ms |
| Send packet CA->Netherlands->CA | 150,000,000 ns | 150 ms |
Where
- 1 ns = 10-9 seconds
- 1 ms = 10-3 seconds
