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Thread benchmarks

Subject: Thread benchmarks
From: Andrew Doran
Date: Fri, 28 Sep 2007 17:51:21 UTC
Newsgroups: fa.netbsd.tech.kern
Back in March I posted some MySQL benchmarks after we switched to a 1:1
threading model in -current *. I've spent a lot of time tuning the pthread
library so I thought I'd post a followup. The original benchmark that I used
(supersmack) now performs much better on -current that it did a few months
ago, so I picked something else this time: MySQL sysbench.

Most of the sysbench runs that I've seen to date have sysbench running on
the same machine as the database. That's a good test but with the exception
of small installations and out-of-band activity, production setups rarely
look like that. So I ran sysbench itself on a seperate dual core system.

Here are the results, comparing NetBSD 3 with NetBSD-current:


And NetBSD-current compared to other systems:


Note this is stock NetBSD-current with FreeBSD's malloc() (jemalloc) in
libc. I'll be merging that some time soon.

With the vmlocking CVS branch and Mindaugas' new scheduler NetBSD peaks
around 500 TPS. There is a very gradual fall off in the number of TPS
achieved as the number of connections begins to ramp up. I suspect that
could be due to a weakness somewhere in the network stack, so I'm hopeful
that a bit of time spent profiling with large numbers of connections could
yield good results.


* http://mail-index.netbsd.org/tech-kern/2007/03/02/0005.html

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