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每个计算机工程师都应该知道的数字列表

2016-12-23 16:04 330 查看
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
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