I was trying to run more than 8 Centos 5.3 virtual machines using VirtualBox 3 on Ubuntu 9.04 and I was running into high cpu load (80-90% cpu load when the virtual machines were idle).
Since this is a web site that discusses operating systems, I felt there should be an article explaining how an OS works. I am no expert in the field but only passionate about the subject, so I decided to do some research for the necessary information and present it in a general, easily comprehensible manner. As a result, I came up with an analogy. I hope it is an easily understandable one.
