The site recently crashed due to out of memory from one of my applications, damn you `tomcat` = `lesson = schedule a restart for your web server or buy more memory`. Good thing eatj my web hosting has an incredible response time and was able to resolved the issue immediately. As a note I created a simple from job notifying me if it already exceeded my available memory. Below are the method to check you memory usage.
# free -m# top# vmstat