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rein in GC during tests by making them run (at most) once per second

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this can provide a significant performance boost during testing, by
preventing the GC from running too frequently.
This commit is contained in:
Jamis Buck 2011-01-19 10:27:53 -07:00
parent 79a06225ef
commit 16a23a184e
2 changed files with 28 additions and 4 deletions
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24
activesupport/lib/active_support/testing/garbage_collection.rb
View File

@ -3,6 +3,9 @@ module Testing
module GarbageCollection
def self.included(base)
base.teardown :scrub_leftover_instance_variables
base.setup :begin_gc_deferment
base.teardown :reconsider_gc_deferment
end
private
@ -14,6 +17,27 @@ def scrub_leftover_instance_variables
remove_instance_variable(var)
end
end
# Minimum interval, in seconds, at which to run GC. Might be less
# frequently than this, if a single test takes longer than this to
# run.
DEFERRED_GC_THRESHOLD = (ENV['DEFERRED_GC_THRESHOLD'] || 1.0).to_f
@@last_gc_run = Time.now
def begin_gc_deferment
GC.disable if DEFERRED_GC_THRESHOLD > 0
end
def reconsider_gc_deferment
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
end
end

8
activesupport/test/test_test.rb
View File

@ -135,9 +135,9 @@ class SetupAndTeardownTest < ActiveSupport::TestCase
teardown :foo, :sentinel, :foo
def test_inherited_setup_callbacks
assert_equal [:reset_callback_record, :foo], self.class._setup_callbacks.map(&:raw_filter)
assert_equal [:begin_gc_deferment, :reset_callback_record, :foo], self.class._setup_callbacks.map(&:raw_filter)
assert_equal [:foo], @called_back
assert_equal [:scrub_leftover_instance_variables, :foo, :sentinel, :foo], self.class._teardown_callbacks.map(&:raw_filter)
assert_equal [:scrub_leftover_instance_variables, :reconsider_gc_deferment, :foo, :sentinel, :foo], self.class._teardown_callbacks.map(&:raw_filter)
end
def setup
@ -167,9 +167,9 @@ class SubclassSetupAndTeardownTest < SetupAndTeardownTest
teardown :bar
def test_inherited_setup_callbacks
assert_equal [:reset_callback_record, :foo, :bar], self.class._setup_callbacks.map(&:raw_filter)
assert_equal [:begin_gc_deferment, :reset_callback_record, :foo, :bar], self.class._setup_callbacks.map(&:raw_filter)
assert_equal [:foo, :bar], @called_back
assert_equal [:scrub_leftover_instance_variables, :foo, :sentinel, :foo, :bar], self.class._teardown_callbacks.map(&:raw_filter)
assert_equal [:scrub_leftover_instance_variables, :reconsider_gc_deferment, :foo, :sentinel, :foo, :bar], self.class._teardown_callbacks.map(&:raw_filter)
end
protected