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@rafaelp
Created January 15, 2013 13:54
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Speed up Rspec suite
# 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
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