How to get higher precision of “CPU%” than that from TOP command?

Question

When I use TOP command, I could get the following info:

shell@android:/ $ top -n 1                                                     

User 31%, System 10%, IO         


        

Answer 1

Use DDMS and method profiling to get a TraceView.

Basically:

1. Launch your app in debug mode
2. In DDMS, in the Devices tab, click "Start method profiling"
3. Do stuff on your device to recreate the conditions you want to monitor
4. Click "Stop method profiling"
5. You'll get a fairly detailed graph with each thread's execution that you can drill down into

More details here: http://developer.android.com/tools/debugging/debugging-tracing.html

Disclaimer: I've only done this with a simple test app so I don't know how much mileage you'll get out of it. It does seem to give a bit more precision than what has been described so far, and does not require root.