I/O : Numbers everyone should know

[Feris Thia]

Hi All,

Sepi banget neh.... ada yang sudah buat artikel Hadoop ? Kita roadmapnya mulai full di Q-1 Tahun Depan. Tapi meanwhile, sekedar intermezzo ini angka menarik mengenai I/O di Google.

Semoga bermanfaat...

Regards,

Feris

 

 

Sent to you by Feris Thia via Google Reader:

 

 

Numbers everyone should know

via Julian Hyde on Streaming Data, Open Source OLAP. And stuff. by nor...@blogger.com (Julian Hyde) on 11/17/10

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 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 w/ cheap algorithm	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

Everyone who wants to design high-performance, scalable systems should memorize these numbers. There are many, many lessons to be learned.

 

 

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