Re: SMP system threading performance question

[Ivan Voras]

Frank Altpeter wrote:

 It might be a complete trivial problem, but i don't see the point (yet)
 ...  but it never gets over the 50.0% idle mark and i never see cpu1
 doing anything, no matter how many parallel processes are running

It's a common question, you should have searched the lists and the web
for it.
http://security.freebsd.org/advisories/FreeBSD-SA-05:09.htt.asc

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Re: SMP system threading performance question

[Abdullah Ibn Hamad Al-Marri]

On 2/13/07, Frank Altpeter [EMAIL PROTECTED] wrote:

snip

The problem is quite disturbing, since that machine hosts a mysql database
which is performing low because half of the cpu power is not used at all.
I recompiled it with WITH_PROC_SCOPE_PTH=YES and with
WITH_LINUXTHREADS=YES but both didn't help, so i assume some OS related
reason for this to happen.


Happy for any hints,


Frank Altpeter


You better use libthr with the MySQL instead of linuxthreads, and
don't use HTT with FreeBSD since it hurts the performance.

For more info about it check http://wiki.freebsd.org/MySQL

Also check how to use it with libmap.conf to make mysql uses libthr as well.

Good luck with it ;)

--
Regards,

-Abdullah Ibn Hamad Al-Marri
Arab Portal
http://www.WeArab.Net/
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