The mobile device lab at Facebook


Insightful post by the folks at Facebook on how they transitioned from testing their apps on a single device to a mobile device lab (holding 1000+ devices) at their Prineville data center.

Having tried out several things, they eventually built their own custom racks which not only hold the devices, but also function as an electromagnetic isolation (EMI) chamber.

Each rack holds eight Mac Minis (or four OCP Leopard servers for Android testing) that drive the phones to install, test, and uninstall the application we’re testing. Each Mac Mini is connected to four iPhones, and each OCP Leopard server is connected to eight Android devices, for a total of 32 phones per rack. The phones connect to Wi-Fi via a wireless access point in each rack. These phones lie on a slightly tilted pegboard so mounted cameras can record their screens. Engineers can access these cameras remotely to learn more about how each phone reacts to a code change.

Right now they have about 60 of these racks, and they are planning on doubling the capacity of each rack from 32 to 64 devices.

UPDATE: Here’s a better picture of such a rack. Note the Mac Minis at the bottom:


The mobile device lab at the Prineville data center →
TechCrunch: Facebook lifts the veil on its mobile device testing lab →

Building a Device Lab

Collection of slidedecks to building your own device lab (only the first one in the series embedded, click through below to see all others):

We cover how to build a device lab as a product for your coworkers to test their work on a spectrum of operating systems and versions. We also cover how to choose devices, organization and cabling, power supply troubleshooting, and tips for getting your users to use the lab considerately.

Videos also available

Building a Device Lab →