Artigo de 22/10/09/

Números que todos deveriam conhecer ;)

Copiando de uma palestra do google sobre sistemas largamente distribídos ;)

” Numbers Everyone 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
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