I've just discovered MON$CALL_STACK, and it seems possible that one
could use this to produce a Monte Carlo type profiler - query it once
every so many seconds, and built up a tree of how often each path
through nested procedures has been hit, thus pointing at which paths
through the code are taking the time.

Do any of the available tools have this feature? - the output I'm after
is a graphical drill-down calling tree like the ones you get from
profilers for conventional languages.

--
Tim Ward