Monorails

Monkey patch Rails to make it faster in non thread safe applications

CAUTION: Use this gem at your own risk.

If your application is not doing any threading, then monorails can bring you a few performance improvements at the cost of losing thread safety.

First monorails includes thread_hazardous that bring a substential performance improvement. See it's readme for explanation.

monorails also patches ActiveSupport::PerThreadRegistry that is used in a couple Rails hotspots. PerThreadRegistry stores an instance in Thread.current which is way slower than a regular instance variable:

Calculating -------------------------------------
         thread-safe    25.176k i/100ms
       thread-unsafe    30.069k i/100ms
-------------------------------------------------
         thread-safe      1.480M (± 6.5%) i/s -      7.377M
       thread-unsafe      2.480M (± 7.2%) i/s -     12.328M

For full details see the benchmark implementation

monorails also backport a performance patch from Rails 4.2 for older versions.

These operations themselves are not that costly, but they are often used in heavy hotspots, especially in Rails, so in the end it adds up. Here's a profiling real life application under real life load:

==================================
  Mode: wall(1000)
  Samples: 15836 (0.35% miss rate)
  GC: 696 (4.40%)
==================================
TOTAL (pct)   SAMPLES (pct)   FRAME
429   (2.5%)    429   (2.5%)  ActiveSupport::PerThreadRegistry#per_thread_registry_instance
419   (2.6%)    419   (2.6%)  ThreadSafe::NonConcurrentCacheBackend#[]
208   (1.3%)    208   (1.3%)  ThreadSafe::NonConcurrentCacheBackend#dupped_backend
 75   (0.5%)     75   (0.5%)  block in ThreadSafe::Cache#values
151   (0.9%)    147   (0.9%)  block in ActiveRecord::AttributeMethods::ClassMethods#define_attribute_methods

Add this line to your application's Gemfile:

gem 'monorails'

And then execute:

$ bundle

Or install it yourself as:

$ gem install monorails

Nothing more to do, it's all automatic.

1. Fork it ( https://github.com/byroot/monorails/fork )
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request