Diffusion Ant (master) Code

ant/tests/bench_prototype_chain.js
8755416ca476master

bench_prototype_chain.js
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			function nowMs() {
			return Date.now();
			}

			function makeChain(depth) {
			function C() {}
			const root = { marker: 1 };
			C.prototype = root;

			let obj = Object.create(root);
			for (let i = 0; i < depth; i++) obj = Object.create(obj);
			return { C, obj, root };
			}

			function bench(label, fn, iters) {
			const t0 = nowMs();
			const result = fn(iters);
			const dt = nowMs() - t0;
			const opsPerMs = dt > 0 ? (iters / dt).toFixed(2) : 'inf';
			console.log(label + ': ' + dt + 'ms (' + opsPerMs + ' ops/ms) result=' + result);
			}

			function runDepth(depth) {
			const iters = 2_000_000;
			const { C, obj, root } = makeChain(depth);

			console.log('\n=== depth=' + depth + ' ===');
			console.log('sanity instanceof=' + (obj instanceof C));
			console.log('sanity isPrototypeOf=' + root.isPrototypeOf(obj));
			console.log('sanity marker=' + obj.marker);

			bench(
			'instanceof',
			n => {
			let c = 0;
			for (let i = 0; i < n; i++) if (obj instanceof C) c++;
			return c;
			},
			iters
			);

			bench(
			'isPrototypeOf',
			n => {
			let c = 0;
			for (let i = 0; i < n; i++) if (root.isPrototypeOf(obj)) c++;
			return c;
			},
			iters
			);

			bench(
			'prop_lookup',
			n => {
			let c = 0;
			for (let i = 0; i < n; i++) c += obj.marker;
			return c;
			},
			iters
			);
			}

			console.log('prototype-chain benchmark');
			runDepth(8);
			runDepth(24);
			runDepth(40);

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