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bench_gc.js
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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(`${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.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());

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