Re: Benchmark MySQL Performance On FreeBSD And Linux

[Greg 'groggy' Lehey <grog@xxxxxxxxxxx>]

On Friday, 16 December 2005 at 11:20:12 +0800, huang leo wrote:
>
> We had evaluated MySQL performance on FreeBSD and Linux. The result is
> attached.

Thank you!

This is some of the most plausible information I've seen in a while.
I'm forwarding it to a MySQL internal list, and I expect we'll discuss
it in much detail.

A few comments:

- You refer to bug http://bugs.mysql.com/bug.php?12251.  Did you
  experience these crashes yourself?  If you look through that bug
  report, you'll find that we (MySQL) have had great difficulty
  reproducing the problem.  Many people have reported that they have
  no trouble under the same conditions, and we were half thinking it
  might be related to (but not the fault of) the hardware in
  question.  Your hardware is very different, so it would help us a
  lot if you're also able to reproduce it.

- There's been a lot of discussion on the FreeBSD lists recently
  suggesting that the performance problems are related to the choice
  of timer.  I've never been convinced, and your results suggest to me
  that this isn't the real problem.  Still, it would be nice to
  compare the results using various timer options.

  If you haven't been following the discussion, it's in the archives
  for the FreeBSD-current mailing list.  Let me know (in private mail)
  if you'd like me to forward them to you.

- I'd be very interested in the deadlocks you've been experiencing.
  If you have any additional information, please let me know.

Do you have scripts for these tests?  I appreciate that the
information is mainly there, but it would be easier for us if the
scripts are available.

Thanks again for the report
Greg
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