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// Call fs.promises.writeFile 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 path = require('path');
const common = require('../common.js');
const fs = require('fs');
const assert = require('assert');
const tmpdir = require('../../test/common/tmpdir');
tmpdir.refresh();
const filename = path.resolve(tmpdir.path,
`.removeme-benchmark-garbage-${process.pid}`);
let filesWritten = 0;
const bench = common.createBenchmark(main, {
duration: [5],
encodingType: ['buf', 'asc', 'utf'],
size: [2, 1024, 65535, 1024 * 1024],
concurrent: [1, 10]
});
function main({ encodingType, duration, concurrent, size }) {
let encoding;
let chunk;
switch (encodingType) {
case 'buf':
chunk = Buffer.alloc(size, 'b');
break;
case 'asc':
chunk = 'a'.repeat(size);
encoding = 'ascii';
break;
case 'utf':
chunk = 'ü'.repeat(Math.ceil(size / 2));
encoding = 'utf8';
break;
default:
throw new Error(`invalid encodingType: ${encodingType}`);
}
let writes = 0;
let benchEnded = false;
bench.start();
setTimeout(() => {
benchEnded = true;
bench.end(writes);
for (let i = 0; i < filesWritten; i++) {
try {
fs.unlinkSync(`${filename}-${i}`);
} catch {
// Continue regardless of error.
}
}
process.exit(0);
}, duration * 1000);
function write() {
fs.promises.writeFile(`${filename}-${filesWritten++}`, chunk, encoding)
.then(() => afterWrite())
.catch((err) => afterWrite(err));
}
function afterWrite(er) {
if (er) {
if (er.code === 'ENOENT') {
// Only OK if unlinked by the timer from main.
assert.ok(benchEnded);
return;
}
throw er;
}
writes++;
if (!benchEnded)
write();
}
while (concurrent--) write();
}
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