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Re: FreeBSD MySQL still WAY slower than Linux



At 01:33 PM 29/06/2005 +0100, Robert Watson wrote this to All:

On Thu, 23 Jun 2005, Steve Roome wrote:

The different threading libraries are more for completeness. In my last test I saw <10% difference between them on amd64.

Well, I finally got some tests out for FreeBSD/i386 with -current, Here we go with a bunch of results of FreeBSD 6 with mysql and different threading libraries, as for you, there's sadly not enough in it so far. Maybe I need to tune a whole bunch of stuff I've missed ?

What version of MySQL are you using? I saw much better FreeBSD MySQL performance with 4.0.x than 4.1.x in terms of transactions per second, and am wondering what changed in MySQL -- did it start using different IPC primitives, threading primitives, etc? I realize it complicates testing, but if you have a chance to compare 4.0.x and 4.1.x across linux and freebsd, that would be quite helpful, so we can see if there's a change in relative performance. Most of my work to optimize MySQL performance with SMP has been using 4.0.x, FYI, so 4.1.x might require different optimization strategies.

I haven't got around to finishing all the benchmarks yet, but on 5.4-RELEASE-p2 amd64, I see about 5-7% better performance with 4.0.x versus 4.1.x for the select-key benchmark, and no improvement for update-select (both with InnoDB tables, using the "my-innodb-heavy-4G.cnf" file).




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