title: How can I find a memory leak on Heroku?
body: <p>I have a Rails 3.2.8 app running on Heroku Cedar with Ruby 1.9.3. The app runs fine when it launches but after a day or so of continuous use, I start to see R14 errors on my logs. Once the memory errors start, they never go away, even if the app is idle for several hours.</p>
  
  <p>Shouldnt the garbage collector clean up unused objects after a while and reduce the memory load? It seems this is not happening on Heroku. Generally, memory usage starts to creep up after running some reports with several thousand rows of data, although results are paginated.</p>
  
  <p>How can I find the memory leak? Plugins like bleak_house are way out of date or dont run nicely in the Heroku environment. Can I adjust the GC settings to make it more aggressive?</p>