Track execution time per task in gradle script?

Question

What is the most elegant way to track the execution times on how long a task took in a gradle build script? In an optimal case log the time directly same or next line to the tas

Answer 1

I created a plugin since passy/build-time-tracker-plugin is no longer actively maintained. Mine prints ASCII bar charts too, and comes with customization options.

https://github.com/asarkar/build-time-tracker

== Build time summary ==
 :commons:extractIncludeProto | 4.000s | 14% | ████
       :commons:compileKotlin | 2.000s |  7% | ██
         :commons:compileJava | 6.000s | 21% | ██████
:service-client:compileKotlin | 1.000s |  4% | █
        :webapp:compileKotlin | 1.000s |  4% | █
     :webapp:dockerBuildImage | 4.000s | 14% | ████
      :webapp:dockerPushImage | 4.000s | 14% | ████

Answer 2

Simple sorting would make @jlevy's solution even better.
Also, for a typical production apps, I think the threshold of 50ms is too low.
We usually care about tasks that take more than X second.
project/build.gradle

import java.util.concurrent.TimeUnit

// Log timings per task.
class TimingsListener implements TaskExecutionListener, BuildListener {
    private long startTime
    private timings = []

    @Override
    void beforeExecute(Task task) {
        startTime = System.nanoTime()
    }

    @Override
    void afterExecute(Task task, TaskState taskState) {
        def ms = TimeUnit.MILLISECONDS.convert(System.nanoTime() - startTime, TimeUnit.NANOSECONDS)
        timings.add(new Tuple2<Integer, String>(ms, task.path))
        task.project.logger.warn "${task.path} took ${ms}ms"
    }

    @Override
    void buildFinished(BuildResult result) {
        println "Task timings:"
        def tmp = timings.toSorted(new Comparator<Tuple2<Integer, String>>() {
            @Override
            int compare(Tuple2<Integer, String> o, Tuple2<Integer, String> t1) {
                return o.first - t1.first
            }
        })
        for (timing in tmp) {
            if (timing.first >= 1000) {
                printf "%ss  %s\n", timing.first / 1000, timing.second
            }
        }
    }

    @Override
    void buildStarted(Gradle gradle) {}

    @Override
    void projectsEvaluated(Gradle gradle) {}

    @Override
    void projectsLoaded(Gradle gradle) {}

    @Override
    void settingsEvaluated(Settings settings) {}
}

gradle.addListener new TimingsListener()

Terminal output:

BUILD SUCCESSFUL in 14m 33s
948 actionable tasks: 419 executed, 476 from cache, 53 up-to-date
Task timings:
1.036s  :cbl-config:mergeMyAppDebugResources
1.187s  :express:bundleMyAppDebug
1.199s  :country:testMyAppDebugUnitTest
1.214s  :core-for-test:extractMyAppDebugAnnotations
1.242s  :analytics:testMyAppDebugUnitTest
1.308s  :express:extractMyAppDebugAnnotations
1.33s  :availability:dataBindingExportBuildInfoMyAppDebug
1.357s  :app:transformNativeLibsWithStripDebugSymbolForMyAppDebug
1.405s  :hermes:generateMyAppDebugBuildConfig
1.56s  :availability:testMyAppDebugUnitTest
1.65s  :app:javaPreCompileMyAppDebugUnitTest
1.749s  :chat:compileMyAppDebugJavaWithJavac
1.858s  :cbl-config-for-test:compileMyAppDebugJavaWithJavac
2.027s  :cbl-config:compileMyAppDebugJavaWithJavac
2.056s  :analytics-for-test:compileMyAppDebugJavaWithJavac
2.447s  :crypto:compileMyAppDebugJavaWithJavac
2.45s  :crypto:testMyAppDebugUnitTest
2.47s  :chat:javaPreCompileMyAppDebugUnitTest
2.639s  :crypto-for-test:dataBindingExportBuildInfoMyAppDebug
2.683s  :test-utils:compileMyAppDebugJavaWithJavac
3.056s  :crypto:lintMyAppDebug
3.227s  :app:transformNativeLibsWithMergeJniLibsForMyAppDebug
3.272s  :express:testMyAppDebugUnitTest
3.394s  :crypto:mergeMyAppDebugResources
3.426s  :core:testMyAppDebugUnitTest
4.299s  :multicity:testMyAppDebugUnitTest
4.333s  :app:packageMyAppDebug
4.584s  :availability-for-test:compileMyAppDebugJavaWithJavac
4.672s  :app:transformResourcesWithMergeJavaResForMyAppDebug
4.786s  :map:lintMyAppDebug
5.309s  :country:lintMyAppDebug
5.332s  :job:lintMyAppDebug
5.389s  :map:testMyAppDebugUnitTest
6.04s  :express:lintMyAppDebug
6.584s  :hermes:lintMyAppDebug
6.707s  :app:transformClassesWithMultidexlistForMyAppDebug
7.052s  :multicity:lintMyAppDebug
8.044s  :multicity:compileMyAppDebugJavaWithJavac
8.87s  :app:transformDexArchiveWithDexMergerForMyAppDebug
9.371s  :uikit:testMyAppDebugUnitTest
9.429s  :availability:lintMyAppDebug
13.12s  :app:compileMyAppDebugUnitTestKotlin
16.276s  :hermes:testMyAppDebugUnitTest
16.898s  :chat:testMyAppDebugUnitTest
17.174s  :job:testMyAppDebugUnitTest
36.008s  :aaefawef:testMyAppDebugUnitTest
96.88s  :app:compileMyAppDebugJavaWithJavac
125.693s  :app:lintMyAppDebug
145.538s  :app:transformClassesWithDexBuilderForMyAppDebug
182.752s  :app:testMyAppDebugUnitTest