MySQL super-smack is a great little benchmarking tool. Using it, you can generate a load on your MySQL server to highlight bottlenecks in your configuration or MySQL itself. Heck, one of these days maybe I'll provide a little tutorial about how I've used it.
The trouble is that it doesn't build out-of-the-box on FreeBSD (minor library conflicts). It works great on Linux. I managed to make it work about 1.5 years ago but never bothered with a patch. So, it is with much delay that I present super-smack-bsd.patch.gz
The usual disclaimers apply. It seems to work for me and may or may not work for you. I'm sending it to MySQL AB so they can better include it in the standard super-smack release.