memory usage

memory.js

const toMB = require('./toMB')
console.log(`[0]\t${takeMem()}`)

const MB = 1024 * 1024;
const MAX = MB * 200;
let s = '', i = -1;
const buff = Buffer.alloc(MAX);

const start = Date.now();


while (++i < MAX) {
  // s += 'a';
  buff.write('a', i)
  // if (s.length === 1000000) console.log(s.length)
  if (!(i % MB)) {
    console.log(`[${toMB(i)}]\t${takeMem()}`)
  }
}
const end = Date.now()

console.log(`${(end - start) / 1000} ms, ${toMB(buff.toString().length)}`);

function takeMem() {
  const used = process.memoryUsage();
  return Object.keys(used).map(key => `${key} ${toMB(used[key])}`).join('\n\t')
}