Current File : /home/vacivi36/vittasync.vacivitta.com.br/vittasync/node/benchmark/fs/readfile-partitioned.js
// Submit a mix of short and long jobs to the threadpool.
// Report total job throughput.
// If we partition the long job, overall job throughput goes up significantly.
// However, this comes at the cost of the long job throughput.
//
// Short jobs: small zip jobs.
// Long jobs: fs.readFile on a large file.
'use strict';
const path = require('path');
const common = require('../common.js');
const filename = path.resolve(__dirname,
`.removeme-benchmark-garbage-${process.pid}`);
const fs = require('fs');
const zlib = require('zlib');
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;
const zipData = Buffer.alloc(1024, 'a');
let waitConcurrent = 0;
// Plus one because of zip
const targetConcurrency = concurrent + 1;
const startedAt = Date.now();
const endAt = startedAt + (duration * 1000);
let reads = 0;
let zips = 0;
bench.start();
function stop() {
const totalOps = reads + zips;
bench.end(totalOps);
try {
fs.unlinkSync(filename);
} catch {
// Continue regardless of error.
}
}
function read() {
fs.readFile(filename, encoding, afterRead);
}
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) === targetConcurrency) {
stop();
} else if (!benchEnded) {
read();
}
}
function zip() {
zlib.deflate(zipData, afterZip);
}
function afterZip(er, data) {
if (er)
throw er;
zips++;
const benchEnded = Date.now() >= endAt;
if (benchEnded && (++waitConcurrent) === targetConcurrency) {
stop();
} else if (!benchEnded) {
zip();
}
}
// Start reads
for (let i = 0; i < concurrent; i++) read();
// Start a competing zip
zip();
}
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