我有一个网站，从几个月以来每天大约有5000名访问者。
pc配置为： 16G Core i5-750 1x2 To 在 Ubuntu Server 12.04 即使我用 service mysql restart ，当我做一个 top ，我可以看过去 200% CPU 在 mysqld .
我试着看看那里是否有任何被阻止的请求 show processlist; 而且没有被封锁的人。
以下是 /etc/mysql/my.cnf :

# 

# The MySQL database server configuration file.

# 

# You can copy this to one of:

# - "/etc/mysql/my.cnf" to set global options,

# - "~/.my.cnf" to set user-specific options.

# 

# One can use all long options that the program supports.

# Run program with --help to get a list of available options and with

# --print-defaults to see which it would actually understand and use.

# 

# For explanations see

# http://dev.mysql.com/doc/mysql/en/server-system-variables.html

# This will be passed to all mysql clients

# It has been reported that passwords should be enclosed with ticks/quotes

# escpecially if they contain "#" chars...

# Remember to edit /etc/mysql/debian.cnf when changing the socket location.

[client]
port            = 3306
socket          = /var/run/mysqld/mysqld.sock

# Here is entries for some specific programs

# The following values assume you have at least 32M ram

# This was formally known as [safe_mysqld]. Both versions are currently parsed.

[mysqld_safe]
socket          = /var/run/mysqld/mysqld.sock
nice            = 0

[mysqld]

# 

# * Basic Settings

# 

user            = mysql
pid-file        = /var/run/mysqld/mysqld.pid
socket          = /var/run/mysqld/mysqld.sock
port            = 3306
basedir         = /usr
datadir         = /var/lib/mysql
tmpdir          = /tmp
lc-messages-dir = /usr/share/mysql
skip-external-locking

# 

# Instead of skip-networking the default is now to listen only on

# localhost which is more compatible and is not less secure.

# bind-address           = 127.0.0.1

# 

# * Fine Tuning

# 

key_buffer              = 16M
max_allowed_packet      = 16M
thread_stack            = 192K
thread_cache_size       = 8

# This replaces the startup script and checks MyISAM tables if needed

# the first time they are touched

myisam-recover         = BACKUP

# max_connections        = 100

# table_cache            = 64

# thread_concurrency     = 10

# 

# * Query Cache Configuration

# 

query_cache_limit       = 1M
query_cache_size        = 16M

# 

# * Logging and Replication

# 

# Both location gets rotated by the cronjob.

# Be aware that this log type is a performance killer.

# As of 5.1 you can enable the log at runtime!

# general_log_file        = /var/log/mysql/mysql.log

# general_log             = 1

# 

# Error log - should be very few entries.

# 

log_error = /var/log/mysql/error.log

# 

# Here you can see queries with especially long duration

# log_slow_queries       = /var/log/mysql/mysql-slow.log

# long_query_time = 2

# log-queries-not-using-indexes

# 

# The following can be used as easy to replay backup logs or for replication.

# note: if you are setting up a replication slave, see README.Debian about

# other settings you may need to change.

# server-id              = 1

# log_bin                        = /var/log/mysql/mysql-bin.log

expire_logs_days        = 10
max_binlog_size         = 100M

# binlog_do_db           = include_database_name

# binlog_ignore_db       = include_database_name

# 

# * InnoDB

# 

# InnoDB is enabled by default with a 10MB datafile in /var/lib/mysql/.

# Read the manual for more InnoDB related options. There are many!

# 

# * Security Features

# 

# Read the manual, too, if you want chroot!

# chroot = /var/lib/mysql/

# 

# For generating SSL certificates I recommend the OpenSSL GUI "tinyca".

# 

# ssl-ca=/etc/mysql/cacert.pem

# ssl-cert=/etc/mysql/server-cert.pem

# ssl-key=/etc/mysql/server-key.pem

[mysqldump]
quick
quote-names
max_allowed_packet      = 16M

[mysql]

# no-auto-rehash # faster start of mysql but no tab completition

[isamchk]
key_buffer              = 16M

# 

# * IMPORTANT: Additional settings that can override those from this file!

# The files must end with '.cnf', otherwise they'll be ignored.

# 

!includedir /etc/mysql/conf.d/

有什么想法吗？