sync: 2591.664ms
async: 9187.473ms
callback: 9790.185ms
nextTick: 452.656ms
readStraightForward: 8755.447ms
sync: 151.101ms
async: 1480.068ms
callback: 1268.984ms
nextTick: 103.432ms
Last active
March 23, 2019 00:10
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readFileSync vs readFile benchmark
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| const fs = require('fs'); | |
| const util = require('util'); | |
| const readFile = util.promisify(fs.readFile); | |
| fs.writeFileSync('a', 'a'); | |
| const attempts = 100000; | |
| function runInCallback(left, cb) { | |
| fs.readFile('a', () => { | |
| if (left > 0) { | |
| runInCallback(left - 1, cb); | |
| } else { | |
| cb(); | |
| } | |
| }); | |
| } | |
| function readStraightForward(callback) { | |
| // Implementation like in: https://github.com/nodejs/node/blob/v10.x/lib/fs.js | |
| fs.open('a', 'r', 0o666, (err, fd) => { | |
| if (err) { | |
| callback(err); | |
| return; | |
| } | |
| fs.fstat(fd, (err, stat) => { | |
| if (err) { | |
| callback(err); | |
| return; | |
| } | |
| const buffer = Buffer.allocUnsafe(stat.size); | |
| fs.read(fd, buffer, 0, stat.size, null, (err) => { | |
| if (err) { | |
| callback(err); | |
| return; | |
| } | |
| fs.close(fd, () => { | |
| callback(null, buffer); | |
| }); | |
| }); | |
| }); | |
| }); | |
| } | |
| const readStraightForwardPromisified = util.promisify(readStraightForward); | |
| (async () => { | |
| console.time('sync'); | |
| for (let i = 0; i < attempts; i++) { | |
| fs.readFileSync('a'); | |
| } | |
| console.timeEnd('sync'); | |
| console.time('async'); | |
| for (let i = 0; i < attempts; i++) { | |
| await readFile('a'); | |
| } | |
| console.timeEnd('async'); | |
| console.time('callback'); | |
| await new Promise(r => runInCallback(attempts, r)); | |
| console.timeEnd('callback'); | |
| console.time('nextTick'); | |
| for (let i = 0; i < attempts; i++) { | |
| await new Promise(r => setImmediate(r)); | |
| } | |
| console.timeEnd('nextTick'); | |
| console.time('readStraightForward'); | |
| for (let i = 0; i < attempts; i++) { | |
| await readStraightForwardPromisified(); | |
| } | |
| console.timeEnd('readStraightForward'); | |
| })().catch(e => console.log(e)); |
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