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benchmark/fs/readfile.js
73 строки
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Rafael Gonzaga
benchmark: include ascii to fs/readfile
19 сен 2024, 23:15
Не верифицирован
19 сен 2024, 23:15
29357cb
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// Call fs.readFile over and over again really fast. // Then see how many times it got called. // Yes, this is a silly benchmark. Most benchmarks are silly. 'use strict'; const common = require('../common.js'); const fs = require('fs'); const tmpdir = require('../../test/common/tmpdir'); tmpdir.refresh(); const filename = tmpdir.resolve(`.removeme-benchmark-garbage-${process.pid}`); const bench = common.createBenchmark(main, { duration: [5], encoding: ['', 'utf-8', 'ascii'], len: [1024, 16 * 1024 * 1024], concurrent: [1, 10], }); function main({ len, duration, concurrent, encoding }) { try { fs.unlinkSync(filename); } catch { // Continue regardless of error. } let data = Buffer.alloc(len, 'x'); fs.writeFileSync(filename, data); data = null; let reads = 0; let waitConcurrent = 0; const startedAt = Date.now(); const endAt = startedAt + (duration * 1000); bench.start(); function read() { fs.readFile(filename, encoding, afterRead); } function stop() { bench.end(reads); try { fs.unlinkSync(filename); } catch { // Continue regardless of error. } process.exit(0); } function afterRead(er, data) { if (er) { throw er; } if (data.length !== len) throw new Error('wrong number of bytes returned'); reads++; const benchEnded = Date.now() >= endAt; if (benchEnded && (++waitConcurrent) === concurrent) { stop(); } else if (!benchEnded) { read(); } } for (let i = 0; i < concurrent; i++) read(); }