parallel-task-fast.png...

parallel-task-slow.png...

                message1: {
                    parallel.syncAt(1)
                    parallel.syncAt(2)
                },
                message3: { parallel.syncAt(3) })
        Dispatch<String> target2 = new DispatchStub(
                message2: {
                    parallel.syncAt(2)
                    parallel.syncAt(3)
                })

        when:
        parallel.run {
            dispatch.dispatchTo(target1)

plugins {
    id('java-library')
}

// tag::parallel-4[]
// tag::parallel-calculated[]
// tag::fork-every[]
// tag::disable-reports[]
tasks.withType(Test).configureEach {
// end::parallel-4[]
// end::parallel-calculated[]
// end::fork-every[]
// end::disable-reports[]

// tag::parallel-4[]
    maxParallelForks = 4
// end::parallel-4[]

// tag::parallel-calculated[]

    private SmokeTestGradleRunner newKotlinRunner(boolean parallel, VersionNumber kotlinVersion, List<String> tasks) {
        List<String> args = []

        // Parallel workers in Kotlin is enabled by Gradle's --parallel flag. See https://youtrack.jetbrains.com/issue/KT-46401/
        // For context on why we test with parallel workers see https://github.com/gradle/gradle/pull/10404
        if (parallel) {
            args = ["--parallel"]
        }

    }

    @Requires(value = IntegTestPreconditions.NotParallelExecutor, reason = """
Don't run in parallel mode, as the expectation for the setup build are incorrect
It could potentially be worth running this in parallel mode to demonstrate the difference between
parallel and configuration cache
""")
    def "runs tasks in same project in parallel by default"() {
        server.start()

        given:
        buildFile << """

            run ":aPing", ":bPing", ":cPing", ":dPing"
        }
    }

    def "tasks are run in parallel if there are tasks without async work running in a different project using --parallel"() {
        given:
        executer.beforeExecute {
            withArgument("--parallel")
        }
        withParallelThreads(3)

        expect:
        2.times {

plugins {
    id("java-library")
}

// tag::parallel-4[]
// tag::parallel-calculated[]
// tag::fork-every[]
// tag::disable-reports[]
tasks.withType<Test>().configureEach {
// end::parallel-4[]
// end::parallel-calculated[]
// end::fork-every[]
// end::disable-reports[]

// tag::parallel-4[]
    maxParallelForks = 4
// end::parallel-4[]

// tag::parallel-calculated[]

        @Scenario(type = PER_COMMIT, operatingSystems = LINUX, testProjects = ["largeJavaMultiProject", "largeMonolithicJavaProject"], iterationMatcher = '.*parallel false.*'),
    ])
    def "up-to-date assemble (parallel #parallel)"() {
        given:
        runner.tasksToRun = ['assemble']
        runner.args += ["-Dorg.gradle.parallel=$parallel"]

        when:

)
class ParallelBuildPerformanceTest extends AbstractCrossBuildPerformanceTest {

    def "clean assemble with 4 parallel workers"() {
        given:
        runner.testGroup = "parallel builds"
        runner.buildSpec {
            displayName("parallel")
            invocation {
                args("-Dorg.gradle.parallel=true", "--max-workers=4")
            }
        }
        runner.baseline {
            displayName("serial")