我怎么才能找到Heroku上的内存泄漏?

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.I have a Rails 3.2.8 app running on Heroku Ceda