Cash App & Gradle: A Journey in Android Developer Productivity

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A Journey in Android Developer Productivity Cash App & Gradle

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How Cash App Does Builds

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The Tools We Used

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./gradlew app:assembleDebug

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./gradlew app:assembleDebug --scan

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Biggest wins and findings

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What we discovered - Discovered negative savings from the remote cache     - After optimizations and applying the cache fix plugin, most instances of negative savings were eliminated, even in East Coast regions.     - Wire plugin cacheability issues     - The configuration for enabling the remote cache was not working properly     - Unnecessary VPN issues causing long build times

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After identifying and fixing cache misses avoidance savings from the remote cache started to increase

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AssembleDebug Build Time Down by ~50%

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Remote Cache Saving CI Builds an average ~8 min per build CI Compute Resource Savings from remote cache: 55 Days & 16 hours per week

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Optimizing for your expensive build tasks

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apply plugin: 'com.android.library ' apply plugin: 'org.jetbrains.kotlin.android ' apply plugin: 'org.jetbrains.kotlin.kapt ' apply plugin: 'org.jetbrains.kotlin.plugin.parcelize ' apply plugin: 'app.cash.paparazzi ' apply plugin: 'app.cash.treehouse'

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Section Title apply plugin: 'java-library'

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apply plugin: 'com.android.library '

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JavaCompile task

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JavaCompile task class files

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JavaCompile task class files source files

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JavaCompile task class files source files target sdk

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JavaCompile task class files source files target sdk max heap size

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task task outputs task inputs

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task task outputs task inputs UP-TO-DATE (aka incremental build)

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JavaCompile task class files source files target sdk max heap size

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JavaCompile task A.class A.java JDK 11 4 GB

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JavaCompile task A.class A.java JDK 11 4 GB EXECUTED

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JavaCompile task A.class, B.class A.java, B.java JDK 11 4 GB

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JavaCompile task A.class, B.class A.java, B.java JDK 11 4 GB EXECUTED

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JavaCompile task A.class, B.class A.java, B.java JDK 11 4 GB UP-TO-DATE x 2

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JavaCompile task A.class A.java JDK 11 4 GB

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JavaCompile task A.class A.java JDK 11 4 GB CACHED echo “org.gradle.caching=true” >> gradle.properties

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Speeding Up Local Builds with the Remote Build Cache

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Average AssembleDebug savings from the remote cache were low: 20 sec wall clock time

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private void addOsXMetadata() { buildScan.background { def json = new JsonSlurper( ) def ip = exec('curl', '-s', 'https://ipinfo.io/ip' ) def ge o if (ip) { geo = json.parseText ( exec('curl', '-s', “https://json.geoiplookup.io/$ip” ) ) } if (ip && geo) { value 'OS: Location', "${geo.city}, ${geo.region}, ${geo.country} " value 'OS: Coordinates', "${geo.latitude}, ${geo.longitude} " } else { value 'OS: Location', 'Unknown ' } } }

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NYC Developers Saving 1 min 12 sec of build execution time per build from the remote build cache   Wall Clock Time: 38 sec of eng time savings

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SF Developers Saving 3 min 41 sec of build execution time per build from the remote build cache Wall Clock Time: 3 min 10 sec eng time savings

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SF vs NYC difference in remote cache avoidance savings: 2 min 12 sec East Coast Local AssembleDebug builds: ~709 per week Remote Cache Node in the East Coast would result in... 709 * 2 min 12 sec = 1559.8 min of saved eng time per week * 48 work weeks per year = 1247.84 hours of saved eng time per year

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$ grep "include '" settings.gradle | wc -l 590

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$ 590 grep "include '" settings.gradle | wc -l

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$ grep "include '" settings.gradle | wc -l 590

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Tracking down bottlenecks in 3rd-party plugins

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Time to run task Time loading from cache Avoidance Savings!

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Best practices for build performance

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@Overrid e T create ( String name, Class type, Action configuratio n ) throws InvalidUserDataException;

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@Overrid e T create ( String name, Class type, Action configuratio n ) throws InvalidUserDataException;

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@Overrid e T create ( String name, Class type, Action configuratio n ) throws InvalidUserDataException; @Overrid e TaskProvider register ( String name, Action configurationActio n ) throws InvalidUserDataException ;

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Upgrade!

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$ grep "include '" settings.gradle | wc -l 590

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buildCache { remote(HttpBuildCache) { if (!isCi) { def pingCache = 'ping -c1 -W1 -q gradle-enterprise.aws.square.com'.execute( ) def isCacheUnreachable = !pingCache.waitFor(2, TimeUnit.SECONDS) | | pingCache.exitValue() == 6 8 if (isCacheUnreachable) { throw new GradleException(... ) } url = 'https://gradle-build-cache.aws.square.com/cache/ ' }

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boolean isVpnCheckEnabled = hasProperty('com.squareup.cash.vpn.check.enabled') ? getProperty('com.squareup.cash.vpn.check.enabled').toBoolean() : true buildCache { remote(HttpBuildCache) { if (!isCi) { def pingCache = 'ping -c1 -W1 -q gradle-enterprise.aws.square.com'.execute( ) def isCacheUnreachable = !pingCache.waitFor(2, TimeUnit.SECONDS) | | pingCache.exitValue() == 6 8 if (isCacheUnreachable && isVpnCheckEnabled) { throw new GradleException(... ) } url = 'https://gradle-build-cache.aws.square.com/cache/ ' }

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void addGradleBuildMetadata() { def filteredProperties = project.propertie s .findAll { def key = it.ke y key.startsWith('android.') | | key.startsWith('org.gradle.') | | key.startsWith('com.squareup.') | | key.startsWith('app.cash.') | | key.startsWith('kotlin.') | | key.startsWith('kapt.' ) } filteredProperties.sort()*.ke y .forEach { key - > println("$key = ${filteredProperties[key]}" ) buildScan.value("Property: $key", "${filteredProperties[key]}" ) } }

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http://bit.ly/34ZN5UQ

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https://github.com/JetBrains/kotlin/blob/master/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/ jetbrains/kotlin/gradle/tasks/Tasks.kt#L223

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Recap of Build Performance Essentials Build Scans = your best friend Daemon Parallel Max Workers Configuration On Demand