Memory constantly increasing in Rails app

Question

I recently launched a new Ruby on Rails application that worked well in development mode. After the launch I have been experiencing the memory being used is constantly increasin

Answer 1

Assuming category_from_feed returns a string (or a symbol perhaps), a magnitude of 300MB increase is quite unlikely. You can roughly arrive at this by profiling this:

4_000_000.times {related_feed_categories << "Loooooooooooooong string" }

This snippet would shoot the memory usage up by about 110MB.

I'd look at DB connections or methods that read a file and then don't close it. I can see that it's related to feeds which probably means you might be using XML. That can be a starting point too.

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Posting this as answer because this looks bad in comments :/