1berry/ruby
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Add test for GC thrashing of young object creation

Browse Source 
This test will prevent performance regressions like [Bug #18929].
This commit is contained in:
Peter Zhu 2022-08-15 09:14:35 -04:00
parent 8d40ede2e0
commit 0264424d58
Notes: git 2022-08-15 23:00:37 +09:00 
Merged: https://github.com/ruby/ruby/pull/6243
1 changed files with 22 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
test/ruby/test_gc.rb
View File

@ -402,6 +402,28 @@ class TestGc < Test::Unit::TestCase
eom
end
def test_thrashing_for_young_objects
# This test prevents bugs like [Bug #18929]
assert_separately %w[--disable-gem], __FILE__, __LINE__, <<-RUBY
# Warmup to make sure heap stabilizes
1_000_000.times { Object.new }
before_stats = GC.stat
1_000_000.times { Object.new }
after_stats = GC.stat
# Should not be thrashing in page creation
assert_equal before_stats[:heap_allocated_pages], after_stats[:heap_allocated_pages]
assert_equal 0, after_stats[:heap_tomb_pages]
assert_equal 0, after_stats[:total_freed_pages]
# Only young objects, so should not trigger major GC
assert_equal before_stats[:major_gc_count], after_stats[:major_gc_count]
RUBY
end
def test_gc_internals
assert_not_nil GC::INTERNAL_CONSTANTS[:HEAP_PAGE_OBJ_LIMIT]
assert_not_nil GC::INTERNAL_CONSTANTS[:RVALUE_SIZE]