1. ReCapture A Pattern-aware Benchmark Tool for Smartphones

2. Motivation How can we know the performance of Android OS, 3G/4G network, energy on the phone? Experiment (Benchmark) Data trace of metrics Analysis

3. Benchmark PC Unlimited energy Interested in performance under heavy tasks: super pi, matrix, primary test, etc. SPEC Smartphone No heavy tasks, except graphics. People use it daily, not for HPC. Usage patterns matter. SPEC does not reflect the true scenario.

4. Benchmark Solution #1: Write an app, run it on volunteers’ phone Hire a volunteer: IRB approval, ethnic, legal issues. Guarantee exact activity under different patterns. How long? What if people forget to run it? How many phones do we need? …

5. Recapture We already have some data set of how people use smartphones. Rice University: Livelab data set. App trace, web trace, phone status trace, etc. Use existing data set as benchmark input. Emulate smartphone usage on the physical phone. Collect the data automatically. WiFi, 3G/4G, CPU, memory, I/O.

6. ReCapture facebookphoneyoutubesms App trace: CPU: Memory: Network:

7. Benefits For researchers Experiment on mobile system performance. Discover the relationship between mobile networks and phone usage. For consumers Choose the right phone for you by yourself. No privacy issues.

8. Timeline 2 – 3 weeks: software architecture. 4 – 5 weeks: development. 1 – 2 weeks: testing and data analysis. April 23 – 25: Demo.