This is a lightly modernized version of the classic Metering System. It is a fork of the version included with Slime, and it only works in Clozure Common Lisp.

The motivation for the fork is that the timestamps used by the Metering System are too coarse to give meaningful results on modern systems. Instead, we call out to the OS for nanosecond-resolution timestamps, and use double-floats for internal arithmetic to preserve the precision thus gained.

As with every version of the Metering System, extensive usage notes are provided by a very long comment in the source code. The only surprises are:

• monitor-all has been renamed to monitor-package, because that’s what it does;
• monitored has been renamed to monitoredp, because it’s a predicate;
• there is a reset function for more conveniently resetting monitoring info.