Help with improving mysql performance on 6.2PRE

[Nick Evans]

On Wed, 4 Oct 2006 20:52:51 -0400 (EDT)
"Jerry Bell" <jbell at stelesys.com> wrote:

> I have a Dell PE2950 with 2 dual core 3.73Ghz processors and 4G of ram. 
> I've looked through some of the lists here and have seen super-smack
> results in the 42k qps range on a 2 dual core opteron system.  I'm able to
> get up to about 34k with the wide at the back of my server whilest rubbing
> the side of it.
> 
> Here's what I've done:
> built both mysql 5.0 and 5.1 from ports with build_static and
> optimazations on.
> changed the clock to TSC
> 
> added the following to my /etc/libmap.conf file:
> [mysqld]
> libc_r.so.5             libthr.so.2
> libc_r.so.6             libthr.so.2
> libthr.so.2             libthr.so.2
> libpthread.so.1         libthr.so.2
> libpthread.so.2         libthr.so.2
> 
> And this is about the best result I get:
> 2950# super-smack -d mysql select-key-mysql.smack 10 10000
> Query Barrel Report for client smacker1
> connect: max=200ms  min=0ms avg= 20ms from 10 clients
> Query_type      num_queries     max_time        min_time        q_per_s
> select_index    200000  0       0       34440.88
> 
> 
> Are there any other optimizations I need to do to mysql or freebsd?  I'm
> still not 100% convinced that I've done everything I need to use libthr
> instead of libpthread.
> 
> I expected the 2950 to be a bit closer to the 1.8Ghz opteron discussed
> here:
> http://article.gmane.org/gmane.os.freebsd.performance/1137/match=mysql
> Realistically, there's probably a bit of a performance advantage in the
> opteron, but I wouldn't expect it to be that large.
> 
> Thanks!
> 
> Jerry
> 
> 
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If you build static you might not be using libthr and libmap AFAIK doesn't
work with static binaries. Build it with only the extra optimizations and try
again. You can check what threading lib it's using with
ldd /usr/local/libexec/mysqld

Nick