93 lines
3.1 KiB
Python
93 lines
3.1 KiB
Python
"""#516: the browser test server pins glibc's mmap threshold.
|
|
|
|
Large frees then go back to the OS instead of fragmenting per-thread arenas.
|
|
"""
|
|
|
|
import ctypes
|
|
import sys
|
|
import unittest
|
|
import unittest.mock as mock
|
|
|
|
from tests.browser import malloc_tuning
|
|
|
|
|
|
class FakeLibc:
|
|
def __init__(self, result=1):
|
|
self.calls = []
|
|
self.result = result
|
|
|
|
def mallopt(self, option, value):
|
|
self.calls.append((option, value))
|
|
return self.result
|
|
|
|
|
|
class PinMmapThresholdTests(unittest.TestCase):
|
|
def test_sets_a_fixed_threshold_through_mallopt(self):
|
|
libc = FakeLibc()
|
|
with mock.patch.object(sys, "platform", "linux"):
|
|
self.assertTrue(malloc_tuning.pin_mmap_threshold(libc))
|
|
# M_MMAP_THRESHOLD is -3; setting it also turns off glibc's dynamic
|
|
# raising of the threshold.
|
|
self.assertEqual(libc.calls, [(-3, 128 * 1024)])
|
|
|
|
def test_reports_a_refused_setting(self):
|
|
with mock.patch.object(sys, "platform", "linux"):
|
|
self.assertFalse(malloc_tuning.pin_mmap_threshold(FakeLibc(result=0)))
|
|
|
|
def test_skips_a_libc_without_mallopt(self):
|
|
with mock.patch.object(sys, "platform", "linux"):
|
|
self.assertFalse(malloc_tuning.pin_mmap_threshold(object()))
|
|
|
|
def test_skips_other_platforms_without_loading_a_libc(self):
|
|
for name in ("win32", "darwin"):
|
|
with (
|
|
self.subTest(name),
|
|
mock.patch.object(sys, "platform", name),
|
|
mock.patch.object(
|
|
ctypes, "CDLL", side_effect=AssertionError("no libc load")
|
|
),
|
|
):
|
|
self.assertFalse(malloc_tuning.pin_mmap_threshold())
|
|
|
|
def test_skips_when_the_process_libc_cannot_be_loaded(self):
|
|
with (
|
|
mock.patch.object(sys, "platform", "linux"),
|
|
mock.patch.object(ctypes, "CDLL", side_effect=OSError("no libc")),
|
|
):
|
|
self.assertFalse(malloc_tuning.pin_mmap_threshold())
|
|
|
|
@unittest.skipUnless(
|
|
sys.platform.startswith("linux")
|
|
and hasattr(ctypes.CDLL(None), "gnu_get_libc_version"),
|
|
"glibc only",
|
|
)
|
|
def test_glibc_accepts_the_setting(self):
|
|
# This pins the threshold for the rest of this test process too; the
|
|
# test server does the same at start, so nothing here depends on it.
|
|
self.assertTrue(malloc_tuning.pin_mmap_threshold())
|
|
|
|
|
|
class ServerMainTests(unittest.TestCase):
|
|
def test_main_pins_the_threshold_before_it_starts_serving(self):
|
|
from tests.browser import server
|
|
|
|
order = []
|
|
|
|
def bind(port):
|
|
order.append("bind")
|
|
raise RuntimeError("stop before serving")
|
|
|
|
with (
|
|
mock.patch.object(
|
|
server, "pin_mmap_threshold", side_effect=lambda: order.append("pin")
|
|
),
|
|
mock.patch.object(server, "bind_listener", side_effect=bind),
|
|
):
|
|
with self.assertRaises(RuntimeError):
|
|
server.main(["--port", "0"])
|
|
self.assertEqual(order, ["pin", "bind"])
|
|
|
|
|
|
if __name__ == "__main__":
|
|
unittest.main()
|