Introduction Benchmarking is the practice of comparing business processes and performance metrics to industry bests and best practices from other companies. Dimensions typically measured are quality, time and cost.
Introduction Benchmarking is a way to test the performance of your application. You can regularly run benchmarks to help analyze and debug performance problems and ensure that you don't introduce regressions in recent changes.
Introduction In software engineering, pro fi ling ("program pro fi ling", "software pro fi ling") is a form of dynamic program analysis that measures, for example, the space (memory) or time complexity of a program, the usage of particular instructions, or the frequency and duration of function calls.
JankStats class JankLoggingActivity : AppCompatActivity() { private lateinit var jankStats: JankStats override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) // metrics state holder can be retrieved regardless of JankStats initialization val metricsStateHolder = PerformanceMetricsState.getForHierarchy(binding.root) // initialize JankStats for current window jankStats = JankStats.createAndTrack( window, Dispatchers.Default.asExecutor(), jankFrameListener, ) // add activity name as state metricsStateHolder.state?.addState("Activity", javaClass.simpleName) // ... }
JankStats class JankLoggingActivity : AppCompatActivity() { private lateinit var jankStats: JankStats override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) // metrics state holder can be retrieved regardless of JankStats initialization val metricsStateHolder = PerformanceMetricsState.getForHierarchy(binding.root) // initialize JankStats for current window jankStats = JankStats.createAndTrack( window, Dispatchers.Default.asExecutor(), jankFrameListener, ) // add activity name as state metricsStateHolder.state?.addState("Activity", javaClass.simpleName) // ... }
JankStats Reporting private val jankFrameListener = JankStats.OnFrameListener { frameData -> // A real app could do something more interesting, like writing the info to local storage and later on report it. Log.v("JankStatsSample", frameData.toString()) }
JankStats Aggregating class FrameData( /** * The time at which this frame began (in nanoseconds) */ val frameStartNanos: Long, /** * The duration of this frame (in nanoseconds) */ val frameDurationNanos: Long, /** * Whether this frame was determined to be janky, meaning that its * duration exceeds the duration determined by the system to indicate jank (@see * [JankStats.jankHeuristicMultiplier]) */ val isJank: Boolean, /** * The UI/app state during this frame. This is the information set by the app, or by * other library code, that can be used later, during analysis, to determine what * UI state was current when jank occurred. * * @see PerformanceMetricsState.addState */ val states: List )
- Main objective: increase confidence in detecting regressions - The sliding window helps you make context-aware decisions - Use width size and threshold to fine-tune the confidence of regression Detecting Regressions in CI
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