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Key Rails Memory Leak Factors

I am trying to solve a memory leak problem using Rails. I can see through New Relic that memory usage is increasing, not decreasing.

This is a spinoff question from a large topic ( Memory is constantly growing in the Rails application ), where I find it difficult to solve the problem. Now I need to know:

What are the main causes / factors associated with memory leaks in Rails?

As far as I understand:

  • Global variables (such as @@ variable) - I don't have any of these

  • Symbols (I didn’t specifically create)

  • Sessions - What should I avoid here? Let me say that I have a session that tracks the last request, which is used by a specific user in a text search on the site. How do I kill him?

  • Leaving Links - What Does It Mean? Could you give an example?

  • Any other examples of bad coding that you can give tend to create memory leaks?

I want to use this information to view my code, so please include examples!

Finally, will it be a "memory leak code"?

ProductController
...
@last_products << Product.order("ASC").limit(5)
end

will this make @last_products bloat?

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Below applications will be destroyed.

Foo.each do |bar|
  #Whatever
end

Foos, . , "Foos", rake, foos, rake , Y , X , X < Y. , , Foos , , .

-, , .

Foo.find_each do |bar|
  #Whatever
end

.

, , ... ...

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