One Quickie

Timing stuff (DTrace->General)
To time stuff in DTrace, get the timestamp (wall-clock time) or vtimestamp (on-CPU time) in the entry. In the return, make sure you have a starting timestamp recorded (this avoids race conditions if the script is run if the function is currently in-flight). Then calculate the delta and do something with it (print it, aggregate it, whateva).
    self->start = timestamp;

/self->start != 0/
    this->delta = timestamp - self->start;
    trace (this->delta);
    self->start = 0;

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Advanced Mac OS X Programming book