Memcache is a php module to speed up websites. Follow the steps below to do this,
# cd /usr/src
#wget http://pecl.php.net/get/memcache/memcache-3.0.8.tgz
#tar -xvzf memcache-3.0.8.tgz
#cd memcache-3.0.8
#phpize
#./configure
#make
#make install
# echo "extension=memcache.so" >> /usr/local/lib/php.ini
#php -m | grep memcache
# cd /usr/src
#wget http://pecl.php.net/get/memcache/memcache-3.0.8.tgz
#tar -xvzf memcache-3.0.8.tgz
#cd memcache-3.0.8
#phpize
#./configure
#make
#make install
# echo "extension=memcache.so" >> /usr/local/lib/php.ini
#php -m | grep memcache