Latency numbers every programmer should know

Latency numbers every programmer should know : Latency Scale

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1		Latency (ns)	Scale	Scale (time)		Numbers from Jeff Dean
2	L1 cache reference	0.5	1	1	second	http://research.google.com/people/jeff/
3	Branch mispredict	5	10	10	seconds	at
4	L2 cache reference	7	14	14	seconds	https://gist.github.com/2841832
5	Mutex lock/unlock	25	50	50	seconds
6	Main memory reference	100	200	3.3	minutes	Graph and scale by Thomas Lee
7	Compress 1K bytes with Zippy	3,000	6,000	1.7	hours	google.com/profiles/tleehoc
8	Send 2K bytes over 1 Gbps network	20,000	40,000	11.1	hours
9	Read 1 MB sequentially from memory	250,000	500,000	5.8	days
10	Round trip within same datacenter	500,000	1,000,000	1.7	weeks
11	Disk seek	10,000,000	20,000,000	7.7	months
12	Read 1 MB sequentially from disk	20,000,000	40,000,000	1.3	years
13	Send packet CA->Netherlands->CA	150,000,000	300,000,000	9.5	years
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