nodejs_process.js

// The following piece of code produce steady usage of memory
// when one of the first two console.log are uncommented. However,
// when the last console.log is the only console.log uncommented,
// memory usage grows indefinitely.

setInterval( function(){
  var util = require('util')
  // Uncomment one of the following lines:
  // console.log('Ding! ', 'Dong' ) // 16.9MB
  // console.log('Ding! ', util.inspect('Dong') ) // 17.1MB
  // console.log('Ding! ', util.inspect(process.memoryUsage()) ) // LEAK?!
  var myarray = []
  for(var i=0;i<100;i+=1){
    myarray.push({})
  }
}, 10 )

Tested on 0.10.2 and 0.10.5

Also, sounds like I'm not alone http://stackoverflow.com/questions/15823874/setinterval-is-hogging-up-resources-alternatives-the-node-js-way