任何程序员应该记住的性能指标

任何程序员应该记住的性能指标
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            0.1 us
Compress 1K bytes with Zippy             3,000 ns            3   us     0.003 ms
Send 2K bytes over 1 Gbps network       20,000 ns           20   us     0.02  ms
Read 1 MB sequentially from memory     250,000 ns          250   us     0.25  ms
Round trip within same datacenter      500,000 ns          500   us     0.5   ms
Disk seek                           10,000,000 ns       10,000   us    10     ms
Read 1 MB sequentially from disk    20,000,000 ns       20,000   us    20     ms
Send packet CA->Netherlands->CA    150,000,000 ns      150,000   us   150     ms

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