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MIRROR: javascript for 🐜's, a tiny runtime with big ambitions ant.themackabu.dev
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123456789101112131415161718192021222324252627282930313233343536// array buffer backing stores live outside the GC heap but must still prompt collections;// promoted dead buffers used to wait for an unrelated major and grew without boundconst assert = require('node:assert');
const MB = 1048576;const ROUNDS = 128;const live = () => Ant.stats().external.buffers / MB;
function churn(n) { let junk = null; for (let i = 0; i < n; i++) junk = { i, next: junk && i % 64 ? junk : null }; return junk;}
const cases = { 'Buffer.alloc': () => Buffer.alloc(MB), 'ArrayBuffer': () => new ArrayBuffer(MB), 'DataView': () => new DataView(new ArrayBuffer(MB)),};
for (const [name, make] of Object.entries(cases)) { const start = live(); let kept = null;
for (let i = 0; i < ROUNDS; i++) { kept = make(); churn(50000); }
const grown = live() - start; assert.strictEqual(kept.byteLength, MB); assert.ok(grown < ROUNDS / 2, `${name} kept ${Math.round(grown)} MB live after ${ROUNDS} x 1 MB`);}
console.log('arraybuffer gc pressure OK');