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Remove MIN_PRE_ALLOC_SIZE from Strings.

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This optimisation is no longer helpful now that we use VWA to allocate
strings in larger size pools where they can be embedded.
This commit is contained in:
Matt Valentine-House 2023-01-10 17:58:45 +00:00 • committed by Peter Zhu
parent fc7f852033
commit bb5fddd070
Notes: git 2023-01-13 15:32:06 +00:00
2 changed files with 25 additions and 13 deletions
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21
test/ruby/test_string.rb
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@ -661,6 +661,27 @@ CODE
assert_equal(Encoding::UTF_8, "#{s}x".encoding)
end
def test_string_interpolations_across_size_pools_get_embedded
omit if GC::INTERNAL_CONSTANTS[:SIZE_POOL_COUNT] == 1
require 'objspace'
base_slot_size = GC::INTERNAL_CONSTANTS[:BASE_SLOT_SIZE]
small_obj_size = (base_slot_size / 2)
large_obj_size = base_slot_size * 2
a = "a" * small_obj_size
b = "a" * large_obj_size
res = "#{a}, #{b}"
dump_res = ObjectSpace.dump(res)
dump_orig = ObjectSpace.dump(a)
new_slot_size = Integer(dump_res.match(/"slot_size":(\d+)/)[1])
orig_slot_size = Integer(dump_orig.match(/"slot_size":(\d+)/)[1])
assert_match(/"embedded":true/, dump_res)
assert_operator(new_slot_size, :>, orig_slot_size)
end
def test_count
a = S("hello world")
assert_equal(5, a.count(S("lo")))