Numbers everyone should know.
I reproduce below Slide 24 from Jeff Dean's keynote (PDF) at LADIS 2009.
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 |