Numbers should knows

from google

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
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 network                      10,000,000 ns
Read 1 MB sequentially from disk                              30,000,000 ns
Send packet CA->Netherlands->CA                       150,000,000 ns