AndroidPerformanceSandbox

Various scenarios to explore with Android performance profiling tools

Purpose

This repository can be used to learn and teach Android performance optimization. For example:

Observe the effect various performance issues can have on the end user
Practice using profiling tools (systrace, perfetto, Android Profiler, etc) to observe issues in various scenarios
Tinker with parameters or logic to gain a better understanding of Android
Benchmark to compare various optimization strategies
Compare how different devices react to performance issues

Scenarios

More will be added soon. For now there are several different concurrency related scenarios.

Concurrency

Examples are provided of Activities executing the same work in parallel in various ways.

Threads - X threads are created and executed. In the default case these are interrupted in onDestroy
Thread Pool - X callables are executed on a Thread Pool of size Y. In the default case the pool is shut down in onDestroy
Coroutines - X coroutines are launched using the default dispatcher. In the default case they are canceled in onDestory

Scenarios marked as Looping will execute threads/coroutines that loop forever with a delay between work. These will still be cleaned up when the Activity is destroyed. Scenarios marked as Leaky will loop and will not be torn down in onDestroy

Memory

Leaked Activity will instantiate a new activity and added a reference to the Application subclass, thus creating a memory leak.

Object Churn is a scenario that allows you to create a large number of churned objects to trigger garbage collection. An indeterminate progress bar is rendered to help visualize UI thread choppiness from GC.

TODO