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Latency numbers every programmer should know
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| ### Latency numbers every programmer 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 = 3 µs | |
| Send 2K bytes over 1 Gbps network ....... 20,000 ns = 20 µs | |
| SSD random read ........................ 150,000 ns = 150 µs | |
| Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs | |
| Round trip within same datacenter ...... 500,000 ns = 0.5 ms | |
| Read 1 MB sequentially from SSD* ..... 1,000,000 ns = 1 ms | |
| Disk seek ........................... 10,000,000 ns = 10 ms | |
| Read 1 MB sequentially from disk .... 20,000,000 ns = 20 ms | |
| Send packet CA->Netherlands->CA .... 150,000,000 ns = 150 ms | |
| Assuming ~1GB/sec SSD | |
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