Need help for performance tuning with Mysql

[Yu Watanabe]

Hello all.

I would like to ask for advice with performance tuning with MySQL.

Following are some data for my server.

CPU    : Xeon(TM) 2.8GHz (2CPUs - 8core total)
Memory : 8GB
OS     : RHEL 4.4 x86_64
MySQL  : MySQL 5.0.50sp1-enterprise

Attached file
# my.cnf.txt                  : my.cnf information
# mysqlext_20120522131034.log : variable and status information from mysqladmin

I have 2 database working with high load.

I wanted to speed up my select and update queries not by
optimizing the query itself but tuning the my.cnf. 

I have referred to following site,
http://dev.mysql.com/doc/refman/5.0/en/server-status-variables.html

and read "Hiperformance Mysql vol.2" ,
and increased the following values, 

table_cache
thread_cache_size
tmp_table_size
max_heap_table_size

but made not much difference.

According to the ps and sar result

*1 PS result
Date       Time      CPU%  RSS     VSZ       
2012/5/22  21:00:39  109   294752  540028

*2 SAR
Average CPU user 25%
            sys  5%
            io   3%

I assume that MySQL can work more but currently not.

I am considersing to off load 1 high load database to 
seperate process and make MySQL work in multiple process.

It would be a great help if people in this forum can give
us an adivice for the tuning.

Best Regards,
Yu Watanabe