Build is Fast in 3.2, But You Can Make it Faster

Overview of performance improvements in Android Studio 3.2, as well as generate build performance tips and tricks both for small and large scale projects.

Transcript

1. Build is Fast in 3.2 But You Can Make it Faster
2. What’s new in Android Studio 3.2? (I hope I won’t repeat the previous talk)
3. Gradle 4.10.2 • Incremental Java Compilation • Heap usage dropped from 350MB to 10MB • Kotlin DSL 1.0 RC (because devs refuse to learn Groovy) • Periodic cache cleanup (or 5.0)
4. Kotlin 1.2.71 • kapt improvements • other kool features
5. R8/D8 • D8 is more stable than ever • Integrated Desugaring is on • R8 is available Art by Kevin Kwok
6. Updating the flags android.enableD8 = false android.enableD8.desugaring = true org.gradle.configureondemand = true android.enableR8 = true kotlin.incremental.usePreciseJavaTracking = true kapt.use.worker.api = true org.gradle.parallel = true org.gradle.caching = true gradle.properties
8. Measuring the Build Time
9. --profile
10. Gradle Build Scan a.k.a. --scan
11. Build structure 1. Initialization & Configuration 2. Build task execution 3. Shrinking & obfuscation (optional)
12. Build structure 1. Initialization & Configuration 2. Build task execution 3. Shrinking & obfuscation (optional) ~ 2-60 sec ~0.5-6 min
13. Gradle Build Cache • Reuse build outputs of any previous execution • Reuse build outputs even if run with clean task • Uniquely identifies outputs of tasks by inputs
14. Gradle Remote Build Cache • Shared among different machines • Reuse build results among CI agents/jobs and individual developers • Set up for free on CI with Docker image • Or remotely with Gradle Enterprise
15. Setting up Remote Cache //settings.gradle //Check if build is ran locally or on CI def ciServer = gradle.properties.gradleUserHomeDir?.parentFile?.name == 'build' buildCache { local { enabled = !ciServer //CI shouldn't use local cache } remote(HttpBuildCache) { enabled = true url = 'http://nexus.mobitv.com/cache/' push = ciServer //push to cache from CI only credentials { username = 'admin' password = 'admin' } } }
16. Let the Magic Begin! LOL U MAD?
17. Why cache doesn’t get hit?! • CRLF vs LF • UTF-8 encoding • Annotations • You used timestamps • 3rd party library used timestamps • Variables in BuildConfig.java • Crashlytics’ unique ids I will write a blogposts on these, I promise!
18. Tips & Tricks
19. Repositories • Reorder and clean repos • Get rid of Maven Central • Use local Nexus Repository Manager
20. //this is very bad repositories { maven { url 'https://objectbox.net/beta-repo/' } maven { url 'https://maven.fabric.io/public' } maven { url 'https://maven.localytics.com/public' } google() mavenCentral() jcenter() }
21. //this is ok repositories { jcenter() google() }
22. //faster repositories { maven { url 'http://nexus.mobitv:8081/repository/' } }
23. Tame your dependencies! module:core +-- com.squareup.moshi:moshi:1.7.0 \-- com.squareup.okio:okio:1.15.0 +-- module:rest \-- com.squareup.okhttp3:okhttp:3.11.0 \-- com.squareup.okio:okio:1.14.0 Both versions are downloaded!
24. Tame your dependencies! module:core +-- com.squareup.moshi:moshi:1.7.0 \-- com.squareup.okio:okio:1.15.0 +-- module:rest \-- com.squareup.okhttp3:okhttp:3.11.0 \-- com.squareup.okio:okio:1.14.0 \-- com.squareup.okio:okio:1.15.0 Both versions are downloaded!
25. Minimizing amount of code • Remove unused libraries • Remove unused code and modules (use Lint and Proguard reports) • Disable unnecessary modules in settings.gradle //settings.gradle //Include easter egg module only when building EE app. if (startParameter?.taskNames?.count {name -> name.contains('easterEgg')} > 0) { include ':easterEgg' }
26. Multi-variant projects 40 Clients 3 Variants 2 Build types x x
27. Forcing single-variant environment 1. Generate build variant dynamically 2. Set current flavor in Gradle script ext.currentFlavor = 'cspire' 3. Add extra build parameter to enable all variants gradlew build –PBUILD_ALL 4. Pain 5. ??? 6. PROFIT
28. Multi-module projects • Use implementation instead of api • Modules should compile in parallel, not in sequence • Split modules into more submodules! • java lib compile faster than android lib • No Kotlin code in module? Don’t apply Kotlin plugin! • Build Scans and Build Cache FTW!
29. Cleaning up unit tests • Make tests flavor-independent • Keep tests only for one product variant android { def isUnitTestBuild = … //read from build arguments //product flavors: 'mobileonly', 'tv', 'firetv' variantFilter { variant -> def names = variant.flavors*.name if (isUnitTestBuild && (names.contains('mobileonly') || names.contains('tv'))) { setIgnore(true) } } }
30. Cleaning up unit tests • Use Build Scans to find slowest tests • Mockito is slow, Powermock is slower • Be careful with multithreading and delays
31. Android Studio 3.3 is coming • Lazy task configuration • Single-variant project sync • R8 is (probably not) enabled by default • Gradle 5.x
32. Q & A @armaxis Artem Chubaryan