Last active
November 17, 2016 14:23
-
-
Save robertobarreda/bd86be5fbd22a362f416 to your computer and use it in GitHub Desktop.
Latency numbers every programmer should know
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| ### 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 | |
|  |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment