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import json
import os
import sys
import time
import traceback
import unittest
from queue import Queue
from test import support
try:
import threading
except ImportError:
print("Multiprocess option requires thread support")
sys.exit(2)
from test.libregrtest.runtest import runtest, INTERRUPTED, CHILD_ERROR
# Minimum duration of a test to display its duration or to mention that
# the test is running in background
PROGRESS_MIN_TIME = 30.0 # seconds
def run_test_in_subprocess(testname, ns):
"""Run the given test in a subprocess with --slaveargs.
ns is the option Namespace parsed from command-line arguments. regrtest
is invoked in a subprocess with the --slaveargs argument; when the
subprocess exits, its return code, stdout and stderr are returned as a
3-tuple.
"""
from subprocess import Popen, PIPE
args = (testname, ns.verbose, ns.quiet)
kwargs = dict(huntrleaks=ns.huntrleaks,
use_resources=ns.use_resources,
output_on_failure=ns.verbose3,
timeout=ns.timeout,
failfast=ns.failfast,
match_tests=ns.match_tests)
slaveargs = (args, kwargs)
slaveargs = json.dumps(slaveargs)
cmd = [sys.executable, *support.args_from_interpreter_flags(),
'-X', 'faulthandler',
'-m', 'test.regrtest',
'--slaveargs', slaveargs]
# Running the child from the same working directory as regrtest's original
# invocation ensures that TEMPDIR for the child is the same when
# sysconfig.is_python_build() is true. See issue 15300.
popen = Popen(cmd,
stdout=PIPE, stderr=PIPE,
universal_newlines=True,
close_fds=(os.name != 'nt'),
cwd=support.SAVEDCWD)
with popen:
stdout, stderr = popen.communicate()
retcode = popen.wait()
return retcode, stdout, stderr
def run_tests_slave(slaveargs):
args, kwargs = json.loads(slaveargs)
if kwargs.get('huntrleaks'):
unittest.BaseTestSuite._cleanup = False
try:
result = runtest(*args, **kwargs)
except KeyboardInterrupt:
result = INTERRUPTED, ''
except BaseException as e:
traceback.print_exc()
result = CHILD_ERROR, str(e)
sys.stdout.flush()
print() # Force a newline (just in case)
print(json.dumps(result))
sys.exit(0)
# We do not use a generator so multiple threads can call next().
class MultiprocessIterator:
"""A thread-safe iterator over tests for multiprocess mode."""
def __init__(self, tests):
self.interrupted = False
self.lock = threading.Lock()
self.tests = tests
def __iter__(self):
return self
def __next__(self):
with self.lock:
if self.interrupted:
raise StopIteration('tests interrupted')
return next(self.tests)
class MultiprocessThread(threading.Thread):
def __init__(self, pending, output, ns):
super().__init__()
self.pending = pending
self.output = output
self.ns = ns
self.current_test = None
self.start_time = None
def _runtest(self):
try:
test = next(self.pending)
except StopIteration:
self.output.put((None, None, None, None))
return True
try:
self.start_time = time.monotonic()
self.current_test = test
retcode, stdout, stderr = run_test_in_subprocess(test, self.ns)
finally:
self.current_test = None
stdout, _, result = stdout.strip().rpartition("\n")
if retcode != 0:
result = (CHILD_ERROR, "Exit code %s" % retcode)
self.output.put((test, stdout.rstrip(), stderr.rstrip(),
result))
return True
if not result:
self.output.put((None, None, None, None))
return True
result = json.loads(result)
self.output.put((test, stdout.rstrip(), stderr.rstrip(),
result))
return False
def run(self):
try:
stop = False
while not stop:
stop = self._runtest()
except BaseException:
self.output.put((None, None, None, None))
raise
def run_tests_multiprocess(regrtest):
output = Queue()
pending = MultiprocessIterator(regrtest.tests)
workers = [MultiprocessThread(pending, output, regrtest.ns)
for i in range(regrtest.ns.use_mp)]
for worker in workers:
worker.start()
finished = 0
test_index = 1
try:
while finished < regrtest.ns.use_mp:
test, stdout, stderr, result = output.get()
if test is None:
finished += 1
continue
regrtest.accumulate_result(test, result)
# Display progress
text = test
ok, test_time = result
if (ok not in (CHILD_ERROR, INTERRUPTED)
and test_time >= PROGRESS_MIN_TIME):
text += ' (%.0f sec)' % test_time
running = []
for worker in workers:
current_test = worker.current_test
if not current_test:
continue
dt = time.monotonic() - worker.start_time
if dt >= PROGRESS_MIN_TIME:
running.append('%s (%.0f sec)' % (current_test, dt))
if running:
text += ' -- running: %s' % ', '.join(running)
regrtest.display_progress(test_index, text)
# Copy stdout and stderr from the child process
if stdout:
print(stdout)
if stderr:
print(stderr, file=sys.stderr)
sys.stdout.flush()
sys.stderr.flush()
if result[0] == INTERRUPTED:
raise KeyboardInterrupt
if result[0] == CHILD_ERROR:
msg = "Child error on {}: {}".format(test, result[1])
raise Exception(msg)
test_index += 1
except KeyboardInterrupt:
regrtest.interrupted = True
pending.interrupted = True
print()
running = [worker.current_test for worker in workers]
running = list(filter(bool, running))
if running:
print("Waiting for %s" % ', '.join(running))
for worker in workers:
worker.join()
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