test_gc_async.js
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test_gc_async.js
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	// Async GC stress: coroutine-heavy allocation without timers

	function stripAnsi(str) {
	return str.replace(/\x1b\[[0-9;]*m/g, '');
	}

	function pad(str, len) {
	const visible = stripAnsi(str).length;
	const diff = len - visible;
	if (diff <= 0) return str;
	return str + ' '.repeat(diff);
	}

	function render() {
	const width = 120;
	const height = 40;
	const lines = [];

	for (let y = 0; y < height; y++) {
	lines.push(' '.repeat(width));
	}

	for (let y = 0; y < height; y++) {
	let text = `\x1b[38;5;196mRow ${y}\x1b[0m: `;
	text += `\x1b[38;5;82m${'█'.repeat(20)}\x1b[0m`;
	text += `\x1b[2m${'░'.repeat(20)}\x1b[0m`;
	text = pad(text, width);
	lines[y] = text;
	}

	return lines.join('\n');
	}

	async function handleEvent(n) {
	for (let i = 0; i < 10; i++) {
	render();
	}
	}

	for (let count = 1; count <= 500; count++) {
	handleEvent(count);
	const stats = Ant.stats();
	console.log(
	`tick ${count}: arena ${(stats.arenaUsed / 1024 / 1024).toFixed(1)}MB / ` +
	`${(stats.arenaSize / 1024 / 1024).toFixed(1)}MB, ` +
	`rss ${(stats.rss / 1024 / 1024).toFixed(1)}MB`
	);
	}

	console.log('Done - forcing GC...');
	Ant.gc();
	const after = Ant.stats();
	console.log(`after GC: arena ${(after.arenaUsed / 1024 / 1024).toFixed(1)}MB`);