Run(fn func(t TestContext))
	// RunParallel runs this test in parallel with other children of the same parent test/suite. Under the hood,
	// this relies on Go's t.Parallel() and will, therefore, have the same behavior.
	//
	// A parallel test will run in parallel with siblings that share the same parent test. The parent test function
	// will exit before the parallel children are executed. It should be noted that if the parent test is prevented

        models.projects.path == [':', ':a', ':b']

        where:
        args << [
            ["--no-parallel"],
            ["--parallel", "-Dorg.gradle.internal.tooling.parallel=false"]
        ]
    }

    @TargetGradleVersion(">=3.4 <6.8")
    def "nested actions do not run in parallel when target Gradle version does not support it"() {
        given:
        setupBuildWithDependencyResolution()

	return frame.Function
}

// Parallel signals that this test is to be run in parallel with (and only with)
// other parallel tests. When a test is run multiple times due to use of
// -test.count or -test.cpu, multiple instances of a single test never run in
// parallel with each other.
func (t *T) Parallel() {
	if t.isParallel {
		panic("testing: t.Parallel called multiple times")
	}
	if t.isEnvSet {

                                                bool is_fetch_op) const;

  // Returns the parallel ids of the op.
  ParallelIdsMap GetParallelIdsMap(Operation* op);

  // Converts from read/write state that relates ops with the same parallel id
  // to a set of last accesses for use with other parallel ids. Reads/writes
  // between parallel ids are conservatively approximated as writes.

=== Visualize parallelism with build scans

Build scans give you a visual timeline of task execution. In the following
example build, you can see long-running tasks at the beginning and end of the build:

image::performance/parallel-task-slow.png[title="Bottleneck in parallel execution"]

Tweaking the build configuration to run the two slow tasks early on and in parallel

            status, TF_INVALID_ARGUMENT,
            absl::StrCat(
                "Got a non-parallel tensor ",
                tensorflow::unwrap(absl::get<TFE_TensorHandle*>(input))
                    ->DebugString(),
                " as input to a parallel operation. First pack non-parallel "
                "tensors for each device into a parallel tensor explicitly.")
                .c_str());
        return absl::nullopt;
      }

	return syscallIsNotSupported(err)
}

// ParallelOn64Bit calls t.Parallel() unless there is a case that cannot be parallel.
// This function should be used when it is necessary to avoid t.Parallel on
// 32-bit machines, typically because the test uses lots of memory.
func ParallelOn64Bit(t *testing.T) {
	if goarch.PtrSize == 4 {
		return
	}
	t.Parallel()

    def "parallel #parallel execution with #threadCount threads, #maxWorkers workers fails fast"() {
        given:
        buildFile.text = generator.initBuildFile(maxWorkers)
        buildFile << """
            test {
                useTestNG() {
                    parallel = '$parallel'
                    threadCount = $threadCount
                }
            }

        msgs.add("*****************************************************************");
        msgs.add("* Your build is requesting parallel execution, but project      *");
        msgs.add("* contains the following plugin(s) that have goals not marked   *");
        msgs.add("* as @threadSafe to support parallel building.                  *");
        msgs.add("* While this /may/ work fine, please look for plugin updates    *");

        }

        when:
        executer.withArguments("--parallel", "--max-workers=2")
        run('test')

        then:
        noExceptionThrown()
    }

    // TODO:configuration-cache test currently flaky since cc might run tests in parallel
    @Requires(value = IntegTestPreconditions.NotConfigCached, reason = "cc might cause tests to run in parallel")