웹페이지의 응답 속도를 빠르게 해주기 위해서 eAccelerator 모듈로 웹캐시를 사용하게 됐습니다.
머 개인 블로그라서.. 체감 속도는 못느끼지만 어느 정돈 성능 향상 있는 듯..?
(Zend Optimizer 가 기본으로 설치가 되어 있어야 합니다.)

공식홈페이지에서 자료를 다운 받아 설치합니다. http://sourceforge.net/projects/eaccelerator/

[root@ruo91 ~]# wget -P /usr/local/src \
http://jaist.dl.sourceforge.net/sourceforge/eaccelerator/eaccelerator-0.9.5.2.tar.bz2

[root@ruo91 ~]# cd /usr/local/src
[root@ruo91 ~]# tar xzvf eaccelerator-0.9.5.2.tar.bz2 && cd eaccelerator-0.9.5.2
[root@ruo91 ~]# /usr/local/php/bin/phpize
[root@ruo91 ~]# ./configure \
--enable-eaccelerator=shared \
--with-php-config=/usr/local/php/bin/php-config
[root@ruo91 ~]# make && make test && make install

[root@ruo91 ~]# cd /var/tmp
[root@ruo91 ~]# mkdir eaccelerator
[root@ruo91 ~]# chown www eaccelerator
[root@ruo91 ~]# chmod 700 eaccelerator

[root@ruo91 ~]# vi /usr/local/apache2/conf/php.ini

[Zend]
zend_extension_manager.optimizer=/usr/local/php/Zend/lib/Optimizer-3.3.3
zend_extension_manager.optimizer_ts=/usr/local/php/Zend/lib/Optimizer_TS-3.3.3
zend_optimizer.version=3.3.3
zend_extension=/usr/local/php/Zend/lib/ZendExtensionManager.so
zend_extension_ts=/usr/local/php/Zend/lib/ZendExtensionManager_TS.so
;

[eAccelerator]
extension_dir=/usr/local/php/lib/php/extensions/no-debug-non-zts-20060613
extension=eaccelerator.so
eaccelerator.shm_size="16"
eaccelerator.cache_dir="/var/tmp/eaccelerator"
eaccelerator.enable="1"
eaccelerator.optimizer="1"
eaccelerator.check_mtime="1"
eaccelerator.debug="0"
eaccelerator.filter=""
eaccelerator.shm_max="0"
eaccelerator.shm_ttl="0"
eaccelerator.shm_prune_period="0"
eaccelerator.shm_only="0"
eaccelerator.compress="1"
eaccelerator.compress_level="9"

추가한 내용을 적용하기 위해서 아파치를 재시작 합니다.

[root@ruo91 ~]# /usr/local/apache2/bin/apachectl restart

[root@ruo91 ~]# echo '<?php phpinfo(); ?>' > /usr/local/apache2/htdocs/phpinfo.php