It is worth noting that the profiler is fully open-source: <a href="https://github.com/plasma-umass/coz" rel="nofollow">https://github.com/plasma-umass/coz</a>. There is even a package for Arch Linux!
Man, I love the idea, even though a lot of the code I want to test is tied to hardware that can't be just slowed down.<p>They show several examples where speeding up a line is predicted to slow down execution, but ~actually optimizing it had the opposite effect, so kudos to them for including bizarre results too. I hope they take this farther; seems promising.