The Road to 60FPS (preview)

**This is a preview**
Interested in improving animation smoothness in your app? This talk goes over how to measure a skipped frame and how to choose a metric to measure animation smoothness. After explaining measurement, this talk goes into some tools we've built at Facebook to blame the cause of skipped frames in production and in test environments.

Transcript

1. The Road to 60 FPS Jason Sendros
2. How do you measure a skipped frame?
3. 60FPS is a lie
4. abd shell dumpsys gfxinfo
5. View.onDraw() VSync Input Animation Draw 18ms 15ms
6. Choreographer ▪  FrameCallback ▪  Delivered during the next frame’s animation callback ▪  Measure the difference between two inputs VSync Input Animation Draw 17ms 17ms 17ms
7. Choreographer VSync Input Animation Draw 17ms 33ms 17ms •  Lightweight •  3-frame buffer draw draw draw drop
8. An FPS measuring API ▪  enable() ▪  disable()
9. How do you choose a metric?
10. avg/p50/p75/p90 frame time
11. Max frame time VSync Input Animation Draw 84ms 34ms
12. Percent time spent in buckets VSync Input Animation Draw 0 0 dropped frames = 4/11 = 36% 1 dropped frame = 2/11 = 18% 2+ dropped frames = 5/11 = 45% 4 dropped 1 dropped 0 0 0
13. How can you assign blame?
14. Production ▪  Must be lightweight ▪  High level ▪  Will not blame every slow frame ▪  Not perfect VSync Input Animation Draw Expensive Work Marker
15. Automated Testing VSync Input Animation Draw Expensive Work
16. Local work ▪  Systrace ▪  Add your own marker ▪  Sample base profiling VSync Input Animation Draw Expensive Work Marker
17. Prevent regressions!
18. Questions?
19. (c) 2009 Facebook, Inc. or its licensors. "Facebook" is a registered trademark of Facebook, Inc.. All rights reserved. 1.0