Memory

A set of tools for profiling memory in Ruby.

Features

Fast memory capture for million+ allocations.
Persist results to disk for vast aggregations and comparisons over time.

Installation

Add this line to your application's Gemfile:

$ bundle add 'memory'

Usage

require 'memory'

report = Memory.report do
	# run your code here
end

report.print

Or, you can use the .start/.stop methods as well:

require 'memory'

sampler = Memory::Sampler.new

sampler.start
# run your code here
sampler.stop

report = sampler.report
report.print

RSpec Integration

memory_sampler = nil
config.before(:all) do |example_group|
	name = example_group.class.description.gsub(/[^\w]+/, '-')
	path = "#{name}.mprof"

	skip if File.exist?(path)

	memory_sampler = Memory::Sampler.new
	memory_sampler.start
end

config.after(:all) do |example_group|
	name = example_group.class.description.gsub(/[^\w]+/, '-')
	path = "#{name}.mprof"

	if memory_sampler
		memory_sampler.stop

		File.open(path, "w", encoding: Encoding::BINARY) do |io|
			memory_sampler.dump(io)
		end

		memory_sampler = nil
	end
end

config.after(:suite) do
	memory_sampler = Memory::Sampler.new

	Dir.glob('*.mprof') do |path|
		$stderr.puts "Loading #{path}..."
		memory_sampler.load(File.read(path, encoding: Encoding::BINARY))
	end

	$stderr.puts "Memory usage:"
	memory_sampler.report.print
end

Raw Object Allocations

before = nil

config.before(:suite) do |example|
	3.times{GC.start}
	GC.disable
	before = ObjectSpace.count_objects
end

config.after(:suite) do |example|
	after = ObjectSpace.count_objects
	GC.enable
	
	$stderr.puts
	$stderr.puts "Object Allocations:"
	
	after.each do |key, b|
		a = before.fetch(key, 0)
		$stderr.puts "#{key}: #{a} -> #{b} = #{b-a} allocations"
	end
end

Contributing

We welcome contributions to this project.

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.

Developer Certificate of Origin

This project uses the Developer Certificate of Origin. All contributors to this project must agree to this document to have their contributions accepted.

Contributor Covenant

This project is governed by the Contributor Covenant. All contributors and participants agree to abide by its terms.

memory

Runtime