dtrace profiling in 11.0

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Feb 23, 2012, 4:06:22 PM2/23/12

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I'm having some troubles getting scripts that use the profile::
stuff to work in 11.0. They seem to do exactly nothing:

<1:02pm>macpro03/gallatin:darwin>sudo /usr/bin/cpuwalk.d
Sampling... Hit Ctrl-C to end.

<wait 60 seconds>
^C
<1:03pm>macpro03/gallatin:darwin>

Whereas on a different mac running 10.x, it works:

<DING!>macpro02/gallatin:~> sudo /usr/bin/cpuwalk.d
Sampling... Hit Ctrl-C to end.
^C

PID: 18 CMD: notifyd

value ------------- Distribution ------------- count
< 0 | 0
0 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 3
1 | 0
<....>

Is there some trick to getting dtrace profiling to work in Lion?

Thanks,

Drew
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