Numbers Everyone Should Know
2019-12-18 本文已影响0人
王劲凯
| type | numbers |
|---|---|
| L1 cache reference | 0.5 ns |
| Branch mispredict | 5 ns |
| L2 cache reference | 7 ns |
| Mutex lock/unlock | 25ns |
| Main memory reference | 100ns |
| Compress 1K bytes with Zippy | 3000 ns |
| Send 2K bytes over 1Gbps network | 20000 ns |
| Read 1 MB sequentially from memory | 250000 ns |
| Round trip within same datacenter | 500000 ns |
| Disk seek | 10000000 ns |
| Read 1 MB sequentially from disk | 20000000 ns |
| Send packet CA->Netherlands->CA | 150000000 ns |
