1/* eslint-disable no-console */ 2 3import { readFile } from 'node:fs/promises'; 4import format from 'human-format'; 5import memwatch from '@airbnb/node-memwatch'; 6import { SAXParser } from '../../packages/parse5-sax-parser/dist/index.js'; 7import { finished } from 'parse5-test-utils/dist/common.js'; 8 9const heapDiffMeasurement = new memwatch.HeapDiff(); 10 11let maxMemUsage = 0; 12 13memwatch.on('stats', (stats) => { 14 maxMemUsage = Math.max(maxMemUsage, stats.used_heap_size); 15}); 16 17const statsPromise = new Promise((resolve) => memwatch.once('stats', resolve)); 18 19const startDate = new Date(); 20 21const parsedDataSize = await parse(); 22const endDate = new Date(); 23const heapDiff = heapDiffMeasurement.end(); 24 25// NOTE: we need at least one `stats` result to get maxMemUsage 26await statsPromise; 27 28async function parse() { 29 const data = await readFile(new URL('../../test/data/huge-page/huge-page.html', import.meta.url), 'utf8'); 30 let parsedDataSize = 0; 31 const stream = new SAXParser(); 32 33 for (let i = 0; i < 200; i++) { 34 parsedDataSize += data.length; 35 stream.write(data); 36 } 37 38 stream.end(); 39 40 await finished(stream); 41 42 return parsedDataSize; 43} 44 45console.log('Input data size:', format(parsedDataSize, { unit: 'B' })); 46 47const scale = new format.Scale({ 48 seconds: 1, 49 minutes: 60, 50 hours: 3600, 51}); 52 53console.log('Duration:', format((endDate - startDate) / 1000, { scale })); 54console.log('Memory before:', heapDiff.before.size); 55console.log('Memory after:', heapDiff.after.size); 56console.log('Memory max:', format(maxMemUsage, { unit: 'B' })); 57