def test_card_marking_words_for_length():
gc = MiniMarkGC(None, card_page_indices=128)
assert gc.card_page_shift == 7
P = 128 * LONG_BIT
assert gc.card_marking_words_for_length(1) == 1
assert gc.card_marking_words_for_length(P) == 1
assert gc.card_marking_words_for_length(P + 1) == 2
assert gc.card_marking_words_for_length(P + P) == 2
assert gc.card_marking_words_for_length(P + P + 1) == 3
assert gc.card_marking_words_for_length(P + P + P + P + P + P + P + P) == 8
assert gc.card_marking_words_for_length(P + P + P + P + P + P + P + P +
1) == 9
def test_card_marking_words_for_length():
gc = MiniMarkGC(None, card_page_indices=128)
assert gc.card_page_shift == 7
P = 128 * LONG_BIT
assert gc.card_marking_words_for_length(1) == 1
assert gc.card_marking_words_for_length(P) == 1
assert gc.card_marking_words_for_length(P+1) == 2
assert gc.card_marking_words_for_length(P+P) == 2
assert gc.card_marking_words_for_length(P+P+1) == 3
assert gc.card_marking_words_for_length(P+P+P+P+P+P+P+P) == 8
assert gc.card_marking_words_for_length(P+P+P+P+P+P+P+P+1) == 9
def test_set_major_threshold():
gc = MiniMarkGC(None, major_collection_threshold=2.0,
growth_rate_max=1.5)
gc.min_heap_size = 100.0
gc.max_heap_size = 300.0
gc.next_major_collection_initial = 0.0
gc.next_major_collection_threshold = 0.0
# first, we don't grow past min_heap_size
for i in range(5):
gc.set_major_threshold_from(100.0)
assert gc.next_major_collection_threshold == 100.0
# then we grow a lot
b = gc.set_major_threshold_from(100 * 2.0)
assert b is False
assert gc.next_major_collection_threshold == 150.0
b = gc.set_major_threshold_from(150 * 2.0)
assert b is False
assert gc.next_major_collection_threshold == 225.0
b = gc.set_major_threshold_from(225 * 2.0)
assert b is True
assert gc.next_major_collection_threshold == 300.0 # max reached
b = gc.set_major_threshold_from(300 * 2.0)
assert b is True
assert gc.next_major_collection_threshold == 300.0
# then we shrink instantly
b = gc.set_major_threshold_from(100.0)
assert b is False
assert gc.next_major_collection_threshold == 100.0
# then we grow a bit
b = gc.set_major_threshold_from(100 * 1.25)
assert b is False
assert gc.next_major_collection_threshold == 125.0
b = gc.set_major_threshold_from(125 * 1.25)
assert b is False
assert gc.next_major_collection_threshold == 156.25
# check that we cannot shrink below min_heap_size
b = gc.set_major_threshold_from(42.7)
assert b is False
assert gc.next_major_collection_threshold == 100.0
def test_set_major_threshold():
gc = MiniMarkGC(None, major_collection_threshold=2.0, growth_rate_max=1.5)
gc.min_heap_size = 100.0
gc.max_heap_size = 300.0
gc.next_major_collection_initial = 0.0
gc.next_major_collection_threshold = 0.0
# first, we don't grow past min_heap_size
for i in range(5):
gc.set_major_threshold_from(100.0)
assert gc.next_major_collection_threshold == 100.0
# then we grow a lot
b = gc.set_major_threshold_from(100 * 2.0)
assert b is False
assert gc.next_major_collection_threshold == 150.0
b = gc.set_major_threshold_from(150 * 2.0)
assert b is False
assert gc.next_major_collection_threshold == 225.0
b = gc.set_major_threshold_from(225 * 2.0)
assert b is True
assert gc.next_major_collection_threshold == 300.0 # max reached
b = gc.set_major_threshold_from(300 * 2.0)
assert b is True
assert gc.next_major_collection_threshold == 300.0
# then we shrink instantly
b = gc.set_major_threshold_from(100.0)
assert b is False
assert gc.next_major_collection_threshold == 100.0
# then we grow a bit
b = gc.set_major_threshold_from(100 * 1.25)
assert b is False
assert gc.next_major_collection_threshold == 125.0
b = gc.set_major_threshold_from(125 * 1.25)
assert b is False
assert gc.next_major_collection_threshold == 156.25
# check that we cannot shrink below min_heap_size
b = gc.set_major_threshold_from(42.7)
assert b is False
assert gc.next_major_collection_threshold == 100.0
