How would you use Perfetto and Trace.beginSection to find a non-obvious bottleneck?
Tests correlation beyond CPU sampling. Covers coarse Trace.beginSection to limit 1-10us overhead, recording app ATrace with CPU/scheduling tracks, and correlating slices against scheduler latency. Red flag: omitting overhead or ignoring Perfetto SQL queries.
Tests whether you can move beyond Android Studio CPU sampling to system-wide causal analysis. A great answer outlines four steps: instrument hot paths with Trace.beginSection but keep granularity coarse because each event costs 1-10us from JNI and a kernel roundtrip; record via Perfetto enabling ATRACE_TAG_APP plus system tracks like CPU scheduling and binder; visualize slice durations and scheduling gaps in the Perfetto UI; use SQL to quantify total time in specific slices across threads.
Read the original → perfetto.dev
- #android
- #perfetto
- #performance
- #tracing
- #debugging
Get five bites like this every day.
Tezvyn delivers a daily feed of 60-second tech bites with quizzes to lock in what you learn.