Backport Ruby 3.1's GC.stat(:time) and GC.total_time. This gem is a noop on Ruby 3.1+.


Add this line to your application's Gemfile:

gem 'gctime'

And then execute:

$ bundle install

Or install it yourself as:

$ gem install gctime


>> GC.measure_total_time
=> true
>> 4.times { GC.start }
=> 4
>> GC.stat(:time)
=> 123 # milliseconds
>> GC.stat[:time]
=> 123 # milliseconds
>> GC.total_time
=> 123909999 # nanoseconds
>> GC.measure_total_time = false # Disable instrumentation
=> false

GC.stat(:time) and GC.stat[:time] returns the total number of milliseconds spent in GC as Integer on MRI and as Float on JRuby and TruffleRuby.

GC.total_time returns the total number of nanoseconds spent in GC as Integer.


After checking out the repo, run bin/setup to install dependencies. Then, run rake test to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and the created tag, and push the .gem file to rubygems.org.


Bug reports and pull requests are welcome on GitHub at https://github.com/Shopify/gctime.


The gem is available as open source under the terms of the MIT License.