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Friday
Nov122010

Stuff the Internet Says on Scalability For November 12th, 2010

Reader Comments (1)

From the first entry "Google – A Study In Scalability And A Little Systems Horse Sense",
I really like the chart:

http://doubleclix.files.wordpress.com/2010/11/numberseveryoneshouldknow.png?w=570&h=425

This is what I always have in mind when I am working on fast path code.

Random tangent:

The mutex lock/unlock measurement is deceptive. Repeatedly acquiring a mutex from the same thread without contention is very different from contending for the same mutex across multiple cores and NUMA nodes.

It also ignores the overhead of bouncing cache lines across cores and NUMA nodes over a shared bus with limited bandwidth. The mutex is not the only expensive part of sharing state between cores.

November 12, 2010 | Unregistered CommenterAriel Weisberg

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