最終更新:2010-09-06 (月) 04:17:21 (4979d)
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