RFR: 8342513: Autoboxing Overhead & Inefficient Parallel Processing

[xxDark]

On Thu, 17 Oct 2024 16:21:29 GMT, wasif kirmani <duke at openjdk.org> wrote:

> [JDK-8342513](https://bugs.openjdk.org/browse/JDK-8342513) : Autoboxing Overhead & Inefficient Parallel Processing

This seems like an AI-generated change... Also, turning a stream into a parallel one is a recipe for disaster.
Consider this case:

var smallNumbers = new ArrayList<>(1_000_000);
var count = new AtomicInteger();
for (int i = 0; i < 3; i++) {
	count.set(0);
	smallNumbers.clear();
	var _ = IntStream.generate(() -> {
				return ThreadLocalRandom.current().nextInt(Character.MAX_VALUE);
			})
			.limit(9_000_000)
			.parallel() // Your code calls parallel here
			.filter(value -> {
				// Collecting in-place to smallNumbers
				if (value < 32768) {
					smallNumbers.add(value);
					count.incrementAndGet();
					return false;
				}
				return true;
			})
			.count(); // Terminate
	if (smallNumbers.size() != count.get()) {
		throw new IllegalStateException();
	}
}

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PR Comment: https://git.openjdk.org/jdk/pull/21566#issuecomment-2420485311