The CS Education Library project at Stanford is an online library which collects and organizes computer science education materials, and gives them away for free.
From my last post about the disapointing performance from Ubuntu 9.04 jaunty Jackalope, now it's fixed. But not really fix, but much better in performance
When system performance on Linux is affected by using too many file descriptors, usually an error can be seen in the log file '(Too many open files)'. Although this affects the entire system, it is a fairly common problem.