Yabeda::GC

Built in metrics for monitoring the Ruby garbage collector. Part of the yabeda suite.

Installation

Add this line to your application's Gemfile:

gem 'yabeda-gc'

And then execute:

$ bundle install

Or install it yourself as:

$ gem install yabeda-gc

Metrics

Metric	Description
`count`	Count of all GCs
`time`	The total time spent in garbage collections (ruby 3+)
`minor_gc_count`	Count of minor GCs
`major_gc_count`	Count of major GCs
`heap_allocated_pages`	Total number of pages allocated for the heap
`heap_sorted_length`	Length of the sorted heap
`heap_allocatable_pages`	Total number of allocatable heap pages
`heap_available_slots`	Total number of slots in heap pages
`heap_live_slots`	Number of live objects slots
`heap_free_slots`	Number of free object slots
`heap_final_slots`	Number of object slots with finalizers attached to them
`heap_marked_slots`	Count of old objects which survived more than 3 GC cycles and number of write-barrier unprotected objects
`heap_eden_pages`	Number of pages allocated for the eden heap
`heap_tomb_pages`	Number of pages allocated for the tomb heap
`total_allocated_pages`	Total number of allocated pages over the lifetime of this process
`total_freed_pages`	Total number of freed pages over the lifetime of this process
`total_allocated_objects`	Total number of allocated objects over the lifetime of this process
`total_freed_objects`	Total number of freed objects over the lifetime of this process
`malloc_increase_bytes`	Total bytes allocated to objects
`malloc_increase_bytes_limit`	Bytes limit that will trigger garbage collection of objects
`remembered_wb_unprotected_objects`	Number of write-barrier unprotected objects in the remembered set
`remembered_wb_unprotected_objects_limit`	Limit on write-barrier unprotected objects allowed in the remembered set
`old_objects`	Number of old objects
`old_objects_limit`	Limit of old objects
`oldmalloc_increase_bytes`	Total bytes allocated to old objects
`oldmalloc_increase_bytes_limit`	Bytes limit that will trigger garbage collection of old objects
`compact_count`	Count of all GC compactions
`read_barrier_faults`	The total number of times the read barrier was triggered during compaction (ruby 3+)
`total_moved_objects`	The total number of objects compaction has moved (ruby 3+)
`marking_time`	The total time spent in marking phase (ruby 3.3+)
`sweeping_time`	The total time spent in sweeping phase (ruby 3.3+)

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec 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.

Releasing

Bump version number in lib/yabeda/gc/version.rb

In case of pre-releases keep in mind rubygems/rubygems#3086 and check version with command like Gem::Version.new(Yabeda::gc::VERSION).to_s
Fill CHANGELOG.md with missing changes, add header with version and date.

Make a commit:

bundle # to update Gemfile.lock
git add lib/yabeda/gc/version.rb CHANGELOG.md Gemfile.lock
version=$(ruby -r ./lib/yabeda/gc/version.rb -e "puts Gem::Version.new(Yabeda::GC::VERSION)")
git commit --message="${version}: " --edit

Create annotated tag:

git tag v${version} --annotate --message="${version}: " --edit --sign

Fill version name into subject line and (optionally) some description (list of changes will be taken from changelog and appended automatically)
Push it:
```
git push --follow-tags
```
GitHub Actions will create a new release, build and push gem into RubyGems! You're done!

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/ianks/yabeda-gc. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the code of conduct.

License

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

Code of Conduct

Everyone interacting in the Yabeda::GC project's codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.

yabeda-gc

Runtime