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Latency numbers every programmer should know
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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 | |
Compress 1K bytes with Zippy 3,000 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 disk 20,000,000 ns | |
Send packet CA->Netherlands->CA 150,000,000 ns | |
By Jeff Dean (http://research.google.com/people/jeff/): |
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