FreeBSD mysql Benchmark on 4BSD/ULE scheduler and i386/amd64

Alban Hertroys dalroi at
Wed Mar 14 08:31:28 UTC 2007

On Mar 14, 2007, at 1:55, Kris Kennaway wrote:

>> This being mysql, the number of processors isn't going to matter
>> much, no matter how many connections you have. Mysql doesn't scale
>> very well to multiple cpu's.
> This might be standard dogma, but it also appears not to be true:

Interesting. Results I have seen using a 16 CPU SGI Altex(?) showed  
an almost linear rise for postgres while mysql topped off after about  
4 threads. Sorry, don't have the URL at hand (I probably still have  
it in my work mail).

Now this may well have been a version before 5.0.33. I'm not sure  
what OS was used either, I suppose it was either Irix or Linux.

Now I am curious whether the same performance drop on Linux would  
occur with a postgres benchmark. It probably will, but if not it  
seems like there's a problem in the way that mysql and linux interact.

Alban Hertroys

		"If you can't see the forest through the trees,
		 cut the trees and you'll see there is no forest"


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