Implementation Testing

Review the following information to test graphics implementations.

For benchmarking, use the following flow by phase:

  • Specification. When initially specifying the device (such as when using immature drivers), use predefined (fixed) clocks and workloads to measure frames per second (fps) rendered. This gives a clear view of hardware capabilities.
  • Development. As drivers mature, use a fixed set of user actions to measure the number of visible stutters (janks) in animations.
  • Production. When a device is ready for comparison against competitors, increase the workload until stutters increase. Determine if the current clock settings can keep up with the load. This can help you identify where to slow the clocks and reduce power use.

For help deriving device capabilities during the specification phase, use the Flatland tool at platform/frameworks/native/cmds/flatland/. Flatland relies on fixed clocks and shows the throughput achievable with composition-based workloads. It uses gralloc buffers to simulate multiple window scenarios, filling in the window with GL then measuring the compositing.