There are very good dedicated solutions for that purpose. Why do you need Liferay to enhance your operating system performance? If you are running Linux or Unix you have tools like vmstat, netstat, top, ntop, uptime, to mention the best known and used. Then you get Nagios, opennms, Monitorix and a lot more, which allow you to graph your system status and then you may tune it depending on the metrics collected.
