11 марта 2010 г.

Numbers everyone should know

Numbers everyone (developer) should know (от разработчиков google)

* 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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