fs-leak.js

var fs = require('fs')
var stream = fs.createWriteStream('test_log.log', {flags: 'w+'})
var buf = new Buffer('im just a little string, log me out and watch mem grow\n', 'utf8')
var start = Date.now()

function log() {
  for(var i = 0; i < 1000; i++) {
    stream.write(buf)
  }
  console.log(process.memoryUsage())
  
  if(Date.now() - start < 10000) {
    return setImmediate(log) 
  }
  
  setInterval(function() {
    console.log(process.memoryUsage())
  }, 1000)
}

log()