Diffusion Ant (feature/nursery) Code

ant/tests/bench_gc.js
ddfe6237cab5feature/nursery

bench_gc.js
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			function fmt(bytes) {
			if (bytes < 1024) return bytes + ' B';
			if (bytes < 1024 * 1024) return (bytes / 1024).toFixed(2) + ' KB';
			return (bytes / 1024 / 1024).toFixed(2) + ' MB';
			}

			function bench(name, fn, iterations = 1) {
			fn();

			const before = Ant.stats().arenaUsed;
			for (let iter = 0; iter < iterations; iter++) fn();
			const afterAlloc = Ant.stats().arenaUsed;

			console.log(' Waiting 5s before GC...');
			Ant.sleep(5);
			Ant.gc();

			console.log(`${name}:`);
			console.log(` Before: ${fmt(before)}, After alloc: ${fmt(afterAlloc)}`);
			console.log(` Allocated: ${fmt(afterAlloc - before)} (${iterations} iterations)`);
			console.log('');
			}

			function manySmallObjects() {
			const objects = [];
			for (let i = 0; i < 1000; i++) {
			objects.push({ id: i, value: i * 2 });
			}
			objects.length = 500;
			}

			function deepObjectGraph() {
			let obj = { value: 0 };
			for (let i = 1; i < 1000; i++) {
			obj = { value: i, child: obj };
			}
			return obj;
			}

			function wideObject() {
			const obj = {};
			for (let i = 0; i < 1000; i++) {
			obj['prop' + i] = i;
			}
			return obj;
			}

			function stringArray() {
			const arr = [];
			for (let i = 0; i < 5000; i++) {
			arr.push('string_value_' + i + '_with_some_extra_content');
			}
			arr.length = 2500;
			}

			function mixedWorkload() {
			const data = {
			objects: [],
			strings: [],
			nested: null
			};

			for (let i = 0; i < 2000; i++) {
			data.objects.push({ x: i, y: i * 2, name: 'obj' + i });
			data.strings.push('item_' + i);
			}

			let nested = { level: 0 };
			for (let i = 1; i < 100; i++) {
			nested = { level: i, prev: nested, data: { a: i, b: i * 2 } };
			}
			data.nested = nested;

			data.objects.length = 1000;
			data.strings.length = 1000;
			}

			console.log('=== GC Benchmark ===\n');

			function showStats(label, s) {
			console.log(`${label}:`);
			console.log(` arenaUsed: ${fmt(s.arenaUsed)}`);
			console.log(` arenaSize: ${fmt(s.arenaSize)}`);
			console.log(` external.buffers: ${fmt(s.external.buffers)}`);
			console.log(` external.code: ${fmt(s.external.code)}`);
			console.log(` external.collections: ${fmt(s.external.collections)}`);
			console.log(` external.total: ${fmt(s.external.total)}`);
			console.log(` cstack: ${fmt(s.cstack)}`);
			console.log(` rss: ${fmt(s.rss)}`);
			console.log('');
			}

			showStats('Initial state', Ant.stats());

			bench('Many small objects (1k objects)', manySmallObjects, 5);
			bench('Deep object graph (1000 levels)', deepObjectGraph, 5);
			bench('Wide object (1000 properties)', wideObject, 5);
			bench('String array (5000 strings)', stringArray, 5);
			bench('Mixed workload', mixedWorkload, 5);

			showStats('Final state', Ant.stats());

			console.log('Note: GC runs automatically at safe points.');
			console.log('Use Ant.gc() as a hint to request collection.');

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