Can I use ruby-prof to track down a memory leak?

[John Gallagher]

Question

I'm debugging a memory leak in a rake task. I want to see a call stack of:

* Living objects

* What object or line originally allocated those objects

Is this possible with ruby-prof?

Setup

Gems

rails 3.2.16

event_bus 1.0.0 (https://github.com/kevinrutherford/event_bus)

activerecord-fast-import (https://github.com/jsuchal/activerecord-fast-import)

Rake task

Imports a CSV file directly into a MySql database using DATA LOAD INFILE and Active Record objects.

What I've Tried

I've tried the modes:

RubyProf::ALLOCATIONS

RubyProf::MEMORY

The documentation says:

RubyProf::ALLOCATIONS Object allocation reports show how many objects each method in a program allocates.

RubyProf::MEMORY Memory usage reports show how much memory each method in a program uses.

This implies that ruby-prof just reports on the total allocation of objects, not just the ones that are living.

That means I can't use it for memory leak tracking... is that right?

[Roger Pack]

So you basically want something like

20.times {

  run_my_program
}

ObjectSpace.each_object{|o| p o.where_allocated }

?

I've seen some patches from tmm1 in the regard, this one and another somewhere else?

https://www.ruby-forum.com/topic/4412059

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