does ruby-prof actually work?

I am running rails 2.1 and cannot get ruby-prof, or more acurately,
the script/performance/request to work.

Installing ruby-prof I get this:
sudo gem install ruby-prof
Building native extensions.  This could take a while...
Successfully installed ruby-prof-0.6.0
1 gem installed
Installing ri documentation for ruby-prof-0.6.0...

No definition for prof_get_cpu_frequency

No definition for prof_set_cpu_frequency
Installing RDoc documentation for ruby-prof-0.6.0...

No definition for prof_get_cpu_frequency

No definition for prof_set_cpu_frequency

Which looks like it is having problems in the docs, so ok.

If I run:
script/performance/request lib/prof_scripts/store_browse_profiler.rb

I get:
Warming up once
3.80 sec, 1 requests, 0 req/sec

Profiling 100x
`gem install ruby-prof` to use the profiler

but doing a gem list has:
ruby-prof (0.6.0)

I can run ruby-prof from the command line:
ruby-prof lib/prof_scripts/store_browse_profiler.rb

But it (obviously) doesn't understand the file as it has a 'get' in
it.

Help!
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