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Numbers everyone should knowThis is a discussion on Numbers everyone should know within the Open Source News and Opinion forums, part of the Open Source Analytics category; Jeffrey Dean recently gave a talk "Building Software Systems at Google and Lessons Learned" at Stanford ( video ). One of his slides was the following list of numbers: L1 ... |
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18th November 2010, 09:12 AM
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 |  Numbers everyone should know Jeffrey Dean recently gave a talk "Building Software Systems at Google and Lessons Learned" at Stanford (video). One of his slides was the following list of numbers: L1 cache reference0.5nsBranch mispredict 5 nsL2 cache reference 7 nsMutex lock/unlock 25 nsMain memory reference 100 nsCompress 1K bytes w/ cheap algorithm 3,000 nsSend 2K bytes over 1 Gbps network 20,000 nsRead 1 MB sequentially from memory 250,000 nsRound trip within same datacenter 500,000 nsDisk seek 10,000,000 nsRead 1 MB sequentially from disk 20,000,000 nsSend packet CA->Netherlands->CA150,000,000 ns Everyone who wants to design high-performance, scalable systems should memorize these numbers. There are many, many lessons to be learned.  More from Julian Hyde on Open Source OLAP Blog ... |
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