test-paralllel.js

// @ts-check
const crypto = require('crypto')
const start = Date.now()

const captureHash = i => {
  crypto.pbkdf2("test", "test", 100000, 512, "sha512", () => {
    console.log(`capture ${i} at ${Date.now() - start}`)
  })
}

for (let i = 0; i < 12; i++) {
  captureHash(i);
}