最終更新:2010-09-06 (月) 04:17:21 (4974d)  

レイテンシ
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処理時間? 

CPU L1 cache reference                        0.5 ns
CPU Branch mispredict                           5 ns
CPU L2 cache reference                          7 ns
Mutex lock/unlock                              25 ns
Main memory reference                         100 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 (7200 rpm)                   10,000,000 ns
Read 1 MB sequentially from disk       20,000,000 ns
Send packet US->NL->US                150,000,000 ns
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