When I saw the CPU usage of our website host, Dreamhost, I was surprised to see the graph going back in time. I suspected something to have gone wrong in their system (See the graph, midway between 8:00 to 12:00). It was only when I realized that it was due to the daylight saving, I felt a relief.

(As you can see, we need to purchase some more memory to keep up with the demand of server…)