memprof2

Memprof2 is a Ruby memory profiler for >= Ruby 2.1.0.

Installation

Execute

$ gem install memprof2

or ddd the following to your Gemfile:

gem 'memprof2'

And then execute:

$ bundle

API

Memprof2.report

Memprof2.start
12.times{ "abc" }
Memprof2.report(out: "/path/to/file")
Memprof2.stop

Start tracking file/line memory size (bytes) information for objects created after calling Memprof2.start, and print out a summary of file:line:class pairs created.

480 file.rb:2:String

Note: Call Memprof2.report again after GC.start to see which objects are cleaned up by the garbage collector:

Memprof2.start
10.times{ $last_str = "abc" }

puts '=== Before GC'
Memprof2.report

puts '=== After GC'
GC.start
Memprof2.report

Memprof2.stop

After GC.start, only the very last instance of "abc" will still exist:

=== Before GC
400 file.rb:2:String
=== After GC
40 file.rb:2:String

Note: Use Memprof2.report! to clear out tracking data after printing out results.

Memprof2.run

Simple wrapper for Memprof2.start/stop that will start/stop memprof around a given block of ruby code.

Memprof2.run do
  100.times{ "abc" }
  100.times{ 1.23 + 1 }
  100.times{ Module.new }
  Memprof2.report(out: "/path/to/file")
end

For the block of ruby code, print out file:line:class pairs for ruby objects created.

4000  file.rb:2:String
4000  file.rb:3:Float
4000  file.rb:4:Module

Note: You can call GC.start at the end of the block to print out only objects that are 'leaking' (i.e. objects that still have inbound references).

ChangeLog

See CHANGELOG.md for details.

Contributing

Fork it
Create your feature branch (git checkout -b my-new-feature)
Commit your changes (git commit -am 'Add some feature')
Push to the branch (git push origin my-new-feature)
Create new Pull Request