NodeJS write speed test

write.js

const fs = require('fs')
const crypto = require('crypto')

// Create 4MB buffer
const buf = crypto.randomBytes(4 * 1024 * 1024)

const drives = [
	'/dev/sda',
	'/dev/sdb',
	'/dev/sdc',
	'/dev/sdd',
	'/dev/sde',
	'/dev/sdf',
	'/dev/sdg',
	'/dev/sdh',
	'/dev/sdi',
	'/dev/sdj',
	'/dev/sdk',
	'/dev/sdl',
	'/dev/sdm',
	'/dev/sdn',
	'/dev/sdo',
	'/dev/sdp'
]

const fds = []

for (let i = 0; i < drives.length; i++) {
	fds.push(fs.openSync(drives[i], fs.constants.O_SYNC | fs.constants.O_WRONLY))
}

let data = 0

const hammer = (fd) => {
	data += buf.length / 1024 / 1024
	fs.write(fd, buf, (err) => {
		if (err) {
			console.log(err)
			process.exit(1)
		}
		hammer(fd)
	})
}

const start = Date.now()
setInterval(() => {
	console.log(data / (Date.now() - start) * 1000, 'MB/s')
}, 1000)

for (let i = 0; i < 8; i++) {
	hammer(fds[i])
}