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fs: add promisified readFile benchmark
add a benchmark for fs.promises.readFile PR-URL: #37608 Reviewed-By: Benjamin Gruenbaum <[email protected]> Reviewed-By: James M Snell <[email protected]> Reviewed-By: Anna Henningsen <[email protected]>
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// Call fs.promises.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'; | ||
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const path = require('path'); | ||
const common = require('../common.js'); | ||
const fs = require('fs'); | ||
const assert = require('assert'); | ||
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const tmpdir = require('../../test/common/tmpdir'); | ||
tmpdir.refresh(); | ||
const filename = path.resolve(tmpdir.path, | ||
`.removeme-benchmark-garbage-${process.pid}`); | ||
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const bench = common.createBenchmark(main, { | ||
duration: [5], | ||
len: [1024, 16 * 1024 * 1024], | ||
concurrent: [1, 10] | ||
}); | ||
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function main({ len, duration, concurrent }) { | ||
try { fs.unlinkSync(filename); } catch { } | ||
let data = Buffer.alloc(len, 'x'); | ||
fs.writeFileSync(filename, data); | ||
data = null; | ||
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let writes = 0; | ||
let benchEnded = false; | ||
bench.start(); | ||
setTimeout(() => { | ||
benchEnded = true; | ||
bench.end(writes); | ||
try { fs.unlinkSync(filename); } catch { } | ||
process.exit(0); | ||
}, duration * 1000); | ||
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function read() { | ||
fs.promises.readFile(filename) | ||
.then((res) => afterRead(undefined, res)) | ||
.catch((err) => afterRead(err)); | ||
} | ||
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function afterRead(er, data) { | ||
if (er) { | ||
if (er.code === 'ENOENT') { | ||
// Only OK if unlinked by the timer from main. | ||
assert.ok(benchEnded); | ||
return; | ||
} | ||
throw er; | ||
} | ||
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if (data.length !== len) | ||
throw new Error('wrong number of bytes returned'); | ||
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writes++; | ||
if (!benchEnded) | ||
read(); | ||
} | ||
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while (concurrent--) read(); | ||
} |