目前Nginx的worker_processes设置为4，php-fpm设置为dynamic模式，max_children=32，start_servers=8，min_spare_servers=4，max_spare_servers=16，max_request=512的环境下，540MB内存剩余380MB，相比之前用Zend Server CE搭建的LAMP内存开销，优化效果还是十分明显的，而且网站速度也很理想，给我最大的感受就是页面请求的响应速度比以前大大提升了。
鉴于MySQL5.5.8这个新产品发布不久，网上的相关资料匮乏，补充一些自己在编译上的内容（注意，我因为自己对innodb无需求，因此屏蔽了innodb引擎，如果需要可以开启参数-DWITH_INNOBASE_STORAGE_ENGINE=1。
#download software package
wget http://www.cmake.org/files/v2.8/cmake-2.8.3.tar.gz
wget http://ftp.gnu.org/gnu/bison/bison-2.4.3.tar.gz
tar zxvf cmake-2.8.3.tar.gz
cd cmake-2.8.3/
./configure --prefix=/usr
gmake
gmake install
cd ../
tar zxvf bison-2.4.3.tar.gz
cd cd bison-2.4.3
./configure
make
make install
#install mysql5.5.8
/usr/sbin/groupadd mysql
/usr/sbin/useradd -g mysql mysql
mkdir -p /data/mysql
chown -R mysql:mysql /data/mysql
tar zxvf mysql-5.5.8.tar.gz
cd mysql-5.5.8
cmake . -DCMAKE_INSTALL_PREFIX=/usr/local/mysql -DMYSQL_DATADIR=/data/mysql -DWITHOUT_INNOBASE_STORAGE_ENGINE=1 -DWITH_MEMORY_STORAGE_ENGINE=1 -DWITH_MYISAM_STORAGE_ENGINE=1 -DSYSCONFDIR=/etc/ -DWITH_SSL=yes -DDEFAULT_CHARSET=utf8 -DDEFAULT_COLLATION=utf8_general_ci -DWITH_READLINE=on
make
make install
/usr/local/mysql/scripts/mysql_install_db --basedir=/usr/local/mysql/ --datadir=/data/mysql --user=mysql
#modify mysql config
vim /etc/my.cnf
[client]
port = 3306
socket = /tmp/mysql.sock
[mysqld]
port = 3306
socket = /tmp/mysql.sock
skip-external-locking
key_buffer_size = 256M
max_allowed_packet = 1M
table_open_cache = 256
sort_buffer_size = 1M
read_buffer_size = 1M
read_rnd_buffer_size = 4M
myisam_sort_buffer_size = 64M
thread_cache_size = 8
query_cache_size= 16M
thread_concurrency = 1
basedir = /usr/local/mysql
datadir = /data/mysql
default-storage-engine = myisam
log-bin=mysql-bin
binlog_format=mixed
server-id = 1
[mysqldump]
quick
max_allowed_packet = 16M
[mysql]
no-auto-rehash
[myisamchk]
key_buffer_size = 128M
sort_buffer_size = 128M
read_buffer = 2M
write_buffer = 2M
[mysqlhotcopy]
interactive-timeout
#add to boot config
cp /usr/local/mysql/support-files/mysql.server /etc/rc.d/init.d/mysqld
chkconfig --add mysqld
/etc/rc.d/init.d/mysqld start
/usr/local/mysql/bin/mysql -u root -p -S /tmp/mysql.sock
PS:如果在编译PHP的时候报错error while loading shared libraries: libmysqlclient.so.16: cannot open shared object file: No such file or directory，可以通过以下方法解决：
ln -s /usr/local/mysql/lib/mysql/libmysqlclient.so.16 /usr/lib/libmysqlclient.so.16
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