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Overview
The article discusses the development and scaling of a mobile device lab at Facebook's Prineville data center, aimed at ensuring optimal app performance across various devices and operating systems. It highlights the challenges faced in building the lab, including hardware and software solutions, and the future plans for enhancing testing capabilities.
What You'll Learn
1
How to implement on-device testing for mobile applications
2
Why electromagnetic isolation is crucial for mobile device testing environments
3
How to use Chef for configuration management in mobile device labs
Prerequisites & Requirements
- Understanding of mobile application performance metrics
- Familiarity with Chef for configuration management(optional)
Key Questions Answered
What is the purpose of the mobile device lab at Facebook's Prineville data center?
The mobile device lab is designed to test the performance of the Facebook app across a wide range of devices and operating systems, ensuring that code changes do not introduce regressions in data usage, memory, or battery consumption.
How does Facebook ensure consistent testing environments in the mobile device lab?
Facebook custom-built racks that function as electromagnetic isolation chambers to prevent Wi-Fi interference between devices. Each rack is designed to hold multiple devices while maintaining a consistent testing environment.
What challenges did Facebook face when scaling the mobile device lab?
Challenges included ensuring consistent throughput within racks, minimizing interference across racks, and managing software configurations effectively. These issues were addressed through custom hardware designs and the use of Chef for configuration management.
What future improvements are planned for the mobile device lab?
Future plans include densifying the rack design to hold more devices, improving Chef's support for iOS devices, and creating a more generic platform for various teams to conduct on-device testing.
Key Statistics & Figures
Number of devices tested in the lab
2,000
This number reflects the target for comprehensive testing across various hardware and software combinations.
Signal attenuation achieved between racks
122 dB
This level of attenuation ensures minimal interference between testing environments, allowing for reliable performance testing.
Number of racks currently in use
60
This indicates the scale of the mobile device testing infrastructure at the Prineville data center.
Technologies & Tools
Configuration Management
Chef
Used for managing software packages and configurations across mobile devices in the lab.
Hardware
Mac Mini
Serves as the control unit for testing, managing multiple connected mobile devices.
Hardware
Ocp Leopard Servers
Used for Android testing within the mobile device lab.
Key Actionable Insights
1Implementing on-device testing is essential for identifying performance regressions that simulators cannot detect.This approach allows for more accurate performance assessments, especially for subtle issues that may arise on actual devices, enhancing the overall user experience.
2Custom hardware solutions can significantly improve the reliability of testing environments.By addressing electromagnetic interference and ensuring consistent Wi-Fi connectivity, teams can achieve more reproducible results in their testing processes.
3Utilizing configuration management tools like Chef can streamline the setup and maintenance of testing environments.This leads to uniformity across devices, reducing the chances of configuration-related failures and allowing teams to focus on resolving actual device issues.
Common Pitfalls
1
Relying solely on simulators for performance testing can lead to undetected regressions.
Simulators may not accurately replicate real-world conditions, resulting in performance issues that only manifest on actual devices.
2
Inconsistent configurations across testing devices can lead to unreliable results.
Without a configuration management system, variations in device setups can obscure the root causes of performance issues, making troubleshooting difficult.
Related Concepts
Mobile Application Performance Testing
Configuration Management Best Practices
Electromagnetic Interference In Hardware Design