Date: Fri, 16 Dec 2005 14:37:22 +1030 From: Greg 'groggy' Lehey <grog@FreeBSD.org> To: huang leo <leo.huang.gd@gmail.com> Cc: freebsd-performance@freebsd.org Subject: Re: Benchmark MySQL Performance On FreeBSD And Linux Message-ID: <20051216040722.GA503@wantadilla.lemis.com> In-Reply-To: <a0cd7c070512151920s67ca6cd6h@mail.gmail.com> References: <a0cd7c070512151920s67ca6cd6h@mail.gmail.com>
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--oyUTqETQ0mS9luUI Content-Type: text/plain; charset=us-ascii Content-Disposition: inline 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 -- See complete headers for address and phone numbers. --oyUTqETQ0mS9luUI Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (FreeBSD) iD8DBQFDoj16IubykFB6QiMRAo+4AKCTe8j9jTkxBG4IzkkovWWmGqUwWQCdHgNu R3fSoeS76/nH4lDIi14u4LQ= =02Md -----END PGP SIGNATURE----- --oyUTqETQ0mS9luUI--
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