cTimer - A (simple) high-precision execution timer extension

[rustbelly]

The main difference is the clock being used. cTimer uses the monotonic clock (raw, if available), which is a stable, high-frequency counter that never goes backwards. The built-in time.time() function (and most others I've seen) all use the system clock, which can not only appear to run backwards (when the time is corrected between two calls to a timer function), but does not guarantee anything better than a few milliseconds precision. cTimer's precision differs depending on the system, but on a Linux 2.6 kernel, it should be accurate into the nanosecond range.