mirror of
https://github.com/python/cpython.git
synced 2025-11-03 23:21:29 +00:00
233 lines
8.8 KiB
Python
233 lines
8.8 KiB
Python
import os
|
|
import sys
|
|
import threading
|
|
import time
|
|
import unittest
|
|
from concurrent import futures
|
|
from concurrent.futures.process import BrokenProcessPool
|
|
|
|
from test import support
|
|
from test.support import hashlib_helper
|
|
|
|
from .executor import ExecutorTest, mul
|
|
from .util import (
|
|
ProcessPoolForkMixin, ProcessPoolForkserverMixin, ProcessPoolSpawnMixin,
|
|
create_executor_tests, setup_module)
|
|
|
|
|
|
class EventfulGCObj():
|
|
def __init__(self, mgr):
|
|
self.event = mgr.Event()
|
|
|
|
def __del__(self):
|
|
self.event.set()
|
|
|
|
|
|
class ProcessPoolExecutorTest(ExecutorTest):
|
|
|
|
@unittest.skipUnless(sys.platform=='win32', 'Windows-only process limit')
|
|
def test_max_workers_too_large(self):
|
|
with self.assertRaisesRegex(ValueError,
|
|
"max_workers must be <= 61"):
|
|
futures.ProcessPoolExecutor(max_workers=62)
|
|
|
|
def test_killed_child(self):
|
|
# When a child process is abruptly terminated, the whole pool gets
|
|
# "broken".
|
|
futures = [self.executor.submit(time.sleep, 3)]
|
|
# Get one of the processes, and terminate (kill) it
|
|
p = next(iter(self.executor._processes.values()))
|
|
p.terminate()
|
|
for fut in futures:
|
|
self.assertRaises(BrokenProcessPool, fut.result)
|
|
# Submitting other jobs fails as well.
|
|
self.assertRaises(BrokenProcessPool, self.executor.submit, pow, 2, 8)
|
|
|
|
def test_map_chunksize(self):
|
|
def bad_map():
|
|
list(self.executor.map(pow, range(40), range(40), chunksize=-1))
|
|
|
|
ref = list(map(pow, range(40), range(40)))
|
|
self.assertEqual(
|
|
list(self.executor.map(pow, range(40), range(40), chunksize=6)),
|
|
ref)
|
|
self.assertEqual(
|
|
list(self.executor.map(pow, range(40), range(40), chunksize=50)),
|
|
ref)
|
|
self.assertEqual(
|
|
list(self.executor.map(pow, range(40), range(40), chunksize=40)),
|
|
ref)
|
|
self.assertRaises(ValueError, bad_map)
|
|
|
|
@classmethod
|
|
def _test_traceback(cls):
|
|
raise RuntimeError(123) # some comment
|
|
|
|
def test_traceback(self):
|
|
# We want ensure that the traceback from the child process is
|
|
# contained in the traceback raised in the main process.
|
|
future = self.executor.submit(self._test_traceback)
|
|
with self.assertRaises(Exception) as cm:
|
|
future.result()
|
|
|
|
exc = cm.exception
|
|
self.assertIs(type(exc), RuntimeError)
|
|
self.assertEqual(exc.args, (123,))
|
|
cause = exc.__cause__
|
|
self.assertIs(type(cause), futures.process._RemoteTraceback)
|
|
self.assertIn('raise RuntimeError(123) # some comment', cause.tb)
|
|
|
|
with support.captured_stderr() as f1:
|
|
try:
|
|
raise exc
|
|
except RuntimeError:
|
|
sys.excepthook(*sys.exc_info())
|
|
self.assertIn('raise RuntimeError(123) # some comment',
|
|
f1.getvalue())
|
|
|
|
@hashlib_helper.requires_hashdigest('md5')
|
|
def test_ressources_gced_in_workers(self):
|
|
# Ensure that argument for a job are correctly gc-ed after the job
|
|
# is finished
|
|
mgr = self.get_context().Manager()
|
|
obj = EventfulGCObj(mgr)
|
|
future = self.executor.submit(id, obj)
|
|
future.result()
|
|
|
|
self.assertTrue(obj.event.wait(timeout=1))
|
|
|
|
# explicitly destroy the object to ensure that EventfulGCObj.__del__()
|
|
# is called while manager is still running.
|
|
support.gc_collect()
|
|
obj = None
|
|
support.gc_collect()
|
|
|
|
mgr.shutdown()
|
|
mgr.join()
|
|
|
|
def test_saturation(self):
|
|
executor = self.executor
|
|
mp_context = self.get_context()
|
|
sem = mp_context.Semaphore(0)
|
|
job_count = 15 * executor._max_workers
|
|
for _ in range(job_count):
|
|
executor.submit(sem.acquire)
|
|
self.assertEqual(len(executor._processes), executor._max_workers)
|
|
for _ in range(job_count):
|
|
sem.release()
|
|
|
|
@support.requires_gil_enabled("gh-117344: test is flaky without the GIL")
|
|
def test_idle_process_reuse_one(self):
|
|
executor = self.executor
|
|
assert executor._max_workers >= 4
|
|
if self.get_context().get_start_method(allow_none=False) == "fork":
|
|
raise unittest.SkipTest("Incompatible with the fork start method.")
|
|
executor.submit(mul, 21, 2).result()
|
|
executor.submit(mul, 6, 7).result()
|
|
executor.submit(mul, 3, 14).result()
|
|
self.assertEqual(len(executor._processes), 1)
|
|
|
|
def test_idle_process_reuse_multiple(self):
|
|
executor = self.executor
|
|
assert executor._max_workers <= 5
|
|
if self.get_context().get_start_method(allow_none=False) == "fork":
|
|
raise unittest.SkipTest("Incompatible with the fork start method.")
|
|
executor.submit(mul, 12, 7).result()
|
|
executor.submit(mul, 33, 25)
|
|
executor.submit(mul, 25, 26).result()
|
|
executor.submit(mul, 18, 29)
|
|
executor.submit(mul, 1, 2).result()
|
|
executor.submit(mul, 0, 9)
|
|
self.assertLessEqual(len(executor._processes), 3)
|
|
executor.shutdown()
|
|
|
|
def test_max_tasks_per_child(self):
|
|
context = self.get_context()
|
|
if context.get_start_method(allow_none=False) == "fork":
|
|
with self.assertRaises(ValueError):
|
|
self.executor_type(1, mp_context=context, max_tasks_per_child=3)
|
|
return
|
|
# not using self.executor as we need to control construction.
|
|
# arguably this could go in another class w/o that mixin.
|
|
executor = self.executor_type(
|
|
1, mp_context=context, max_tasks_per_child=3)
|
|
f1 = executor.submit(os.getpid)
|
|
original_pid = f1.result()
|
|
# The worker pid remains the same as the worker could be reused
|
|
f2 = executor.submit(os.getpid)
|
|
self.assertEqual(f2.result(), original_pid)
|
|
self.assertEqual(len(executor._processes), 1)
|
|
f3 = executor.submit(os.getpid)
|
|
self.assertEqual(f3.result(), original_pid)
|
|
|
|
# A new worker is spawned, with a statistically different pid,
|
|
# while the previous was reaped.
|
|
f4 = executor.submit(os.getpid)
|
|
new_pid = f4.result()
|
|
self.assertNotEqual(original_pid, new_pid)
|
|
self.assertEqual(len(executor._processes), 1)
|
|
|
|
executor.shutdown()
|
|
|
|
def test_max_tasks_per_child_defaults_to_spawn_context(self):
|
|
# not using self.executor as we need to control construction.
|
|
# arguably this could go in another class w/o that mixin.
|
|
executor = self.executor_type(1, max_tasks_per_child=3)
|
|
self.assertEqual(executor._mp_context.get_start_method(), "spawn")
|
|
|
|
def test_max_tasks_early_shutdown(self):
|
|
context = self.get_context()
|
|
if context.get_start_method(allow_none=False) == "fork":
|
|
raise unittest.SkipTest("Incompatible with the fork start method.")
|
|
# not using self.executor as we need to control construction.
|
|
# arguably this could go in another class w/o that mixin.
|
|
executor = self.executor_type(
|
|
3, mp_context=context, max_tasks_per_child=1)
|
|
futures = []
|
|
for i in range(6):
|
|
futures.append(executor.submit(mul, i, i))
|
|
executor.shutdown()
|
|
for i, future in enumerate(futures):
|
|
self.assertEqual(future.result(), mul(i, i))
|
|
|
|
def test_python_finalization_error(self):
|
|
# gh-109047: Catch RuntimeError on thread creation
|
|
# during Python finalization.
|
|
|
|
context = self.get_context()
|
|
|
|
# gh-109047: Mock the threading.start_joinable_thread() function to inject
|
|
# RuntimeError: simulate the error raised during Python finalization.
|
|
# Block the second creation: create _ExecutorManagerThread, but block
|
|
# QueueFeederThread.
|
|
orig_start_new_thread = threading._start_joinable_thread
|
|
nthread = 0
|
|
def mock_start_new_thread(func, *args, **kwargs):
|
|
nonlocal nthread
|
|
if nthread >= 1:
|
|
raise RuntimeError("can't create new thread at "
|
|
"interpreter shutdown")
|
|
nthread += 1
|
|
return orig_start_new_thread(func, *args, **kwargs)
|
|
|
|
with support.swap_attr(threading, '_start_joinable_thread',
|
|
mock_start_new_thread):
|
|
executor = self.executor_type(max_workers=2, mp_context=context)
|
|
with executor:
|
|
with self.assertRaises(BrokenProcessPool):
|
|
list(executor.map(mul, [(2, 3)] * 10))
|
|
executor.shutdown()
|
|
|
|
|
|
create_executor_tests(globals(), ProcessPoolExecutorTest,
|
|
executor_mixins=(ProcessPoolForkMixin,
|
|
ProcessPoolForkserverMixin,
|
|
ProcessPoolSpawnMixin))
|
|
|
|
|
|
def setUpModule():
|
|
setup_module()
|
|
|
|
|
|
if __name__ == "__main__":
|
|
unittest.main()
|