What's New on the Leopard Command Line? | MacResearch: "Here are some of the DTrace scripts you will find that may be of use in profiling your system:
* bitesize.d – Analyse disk I/O size by process.
* creatbyproc.d – File creates by process name.
* httpdstat.d – Realtime httpd statistics.
* hotspot.d – Plot disk event by location, look for hotspots.
* cpuwalk.d – Measure which CPUs a process runs on.
* weblatency.d – Measures web latency."