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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';
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}`);
const bench = common.createBenchmark(main, {
duration: [5],
encoding: ['', 'utf-8'],
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 writes = 0;
let benchEnded = false;
bench.start();
setTimeout(() => {
benchEnded = true;
bench.end(writes);
try {
fs.unlinkSync(filename);
} catch {
// Continue regardless of error.
}
process.exit(0);
}, duration * 1000);
function read() {
fs.promises.readFile(filename, encoding)
.then((res) => afterRead(undefined, res))
.catch((err) => afterRead(err));
}
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;
}
if (data.length !== len)
throw new Error('wrong number of bytes returned');
writes++;
if (!benchEnded)
read();
}
while (concurrent--) read();
}
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