forkedProjects = new ArrayList<>(forkedExecutions.size());

            try {
                for (Map.Entry<String, List<MojoExecution>> fork : forkedExecutions.entrySet()) {
                    String projectId = fork.getKey();

                    ProjectIndex projectIndex = session.getSession()
                            .getData()

[source.multi-language-sample,groovy]
----
<task>.options.fork = true
----
====

To apply the configuration to _all_ Java compilation tasks, you can `configureEach` java compilation task:

====
include::sample[dir="snippets/performance/parallelTestExecution/kotlin",files="build.gradle.kts[tags=fork-java]"]
include::sample[dir="snippets/performance/parallelTestExecution/groovy",files="build.gradle[tags=fork-java]"]
====

                        <version>3.8.0</version>
                        <configuration>
                            <source>1.8</source>
                            <target>1.8</target>
                            <fork>true</fork>
                            <meminitial>${config.compilerMemory}</meminitial>
                            <maxmem>${config.compilerMemory}</maxmem>
                        </configuration>
                    </plugin>

        buildFile << """
            apply plugin: 'java'
            ${mavenCentralRepository()}
            dependencies { ${testImplementationConfiguration} 'junit:junit:4.13' }
            compileTestJava.options.fork = true  // forked as 'Gradle Test Executor 1'
        """

        file("src/test/java/MyTest.java") << """
            package example;
            public class MyTest {

        outputContains("Appending implementation to build cache key:")
        outputContains("Appending additional implementation to build cache key:")
        outputContains("Appending input value fingerprint for 'options.fork'")
        outputContains("Appending input file fingerprints for 'classpath'")
        def sourcesDebugLogging = "Appending input file fingerprints for 'stableSources' to build cache key: "

		// that delegated go command may think that it is itself a telemetry
		// child.
		//
		// On the other hand, if telemetryChildVar were simply unset, then the
		// delegated go commands would fork themselves recursively. Short-circuit
		// this recursion.
		os.Setenv(telemetryChildVar, "2")
		upload := os.Getenv(telemetryUploadVar) == "1"
		child(reportCrashes, upload, config.UploadStartTime, config.UploadURL)

}

// signalDuringFork is called if we receive a signal while doing a fork.
// We do not want signals at that time, as a signal sent to the process
// group may be delivered to the child process, causing confusion.
// This should never be called, because we block signals across the fork;
// this function is just a safety check. See issue 18600 for background.
func signalDuringFork(sig uint32) {

}

packageCycles {
    excludePatterns.add("org/gradle/**")
}

tasks.test {
    setForkEvery(200)
}

tasks.compileTestGroovy {
    groovyOptions.fork("memoryInitialSize" to "128M", "memoryMaximumSize" to "1G")
}

tasks.isolatedProjectsIntegTest {
    enabled = true
}

integTest.usesJavadocCodeSnippets = true

        assertToolchainUsages(events1, jdkMetadata1, "JavaLauncher")
        assertToolchainUsages(events2, jdkMetadata2, "JavaLauncher")
    }

    def "emits toolchain usages for compilation that configures #option via fork options"() {
        JvmInstallationMetadata curJdk = AvailableJavaHomes.getJvmInstallationMetadata(Jvm.current())

* [git](https://git-scm.com/) and a [GitHub account](https://github.com/join).

Gradle uses pull requests for contributions. Fork [gradle/gradle](https://github.com/gradle/gradle) and clone your fork. Configure your Git username and email with:

    git config user.name 'First Last'
    git config user.email ******@****.***

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