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rafaelp/deferred_garbage_collection.rb

Created January 15, 2013 13:54
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  1. rafaelp created this gist Jan 15, 2013.
    35 changes: 35 additions & 0 deletions deferred_garbage_collection.rb
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,35 @@
    # Joe Van Dyk discovered that running the Ruby garbage collector only every X seconds can speed up your tests.
    # I found that deferring garbage collection would speed up my RSpec examples by about 15%,
    # but it probably depends on the nature of your tests.
    # https://makandracards.com/makandra/950-speed-up-rspec-by-deferring-garbage-collection

    class DeferredGarbageCollection
    RESERVED_IVARS = %w(@loaded_fixtures)
    DEFERRED_GC_THRESHOLD = (ENV['DEFER_GC'] || 10.0).to_f
    @@last_gc_run = Time.now
    def self.start
    GC.disable if DEFERRED_GC_THRESHOLD > 0
    end
    def self.reconsider
    if DEFERRED_GC_THRESHOLD > 0 && Time.now - @@last_gc_run >= DEFERRED_GC_THRESHOLD
    GC.enable
    GC.start
    GC.disable
    @@last_gc_run = Time.now
    end
    end
    end

    RSpec.configure do |config|
    config.before(:all) do
    DeferredGarbageCollection.start
    end
    config.after(:each) do
    (instance_variables - DeferredGarbageCollection::RESERVED_IVARS).each do |ivar|
    instance_variable_set(ivar, nil)
    end
    end
    config.after(:all) do
    DeferredGarbageCollection.reconsider
    end
    end