NewRelic recently released dPerf – A Distributed Low Impact CPU Profiler for iOS.
dPerf is a small on-device profiling framework. Metrics collected by the profiler are pushed to a Node.js service with JSON over REST and are stored in a MongoDB collection.
The Node service then provides a view that renders the profile data with Google Charts. And here’s the best part: New Relic is releasing dPerf as an open source project!
You should be using NewRelic by now... and as always, your free account is waiting for you at newrelic.com