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import multiprocessing
import os
import time
import lit.Test
import lit.util
import lit.worker
# No-operation semaphore for supporting `None` for parallelism_groups.
# lit_config.parallelism_groups['my_group'] = None
class NopSemaphore(object):
def acquire(self): pass
def release(self): pass
def create_run(tests, lit_config, workers, progress_callback, max_failures,
timeout):
assert workers > 0
if workers == 1:
return SerialRun(tests, lit_config, progress_callback, max_failures, timeout)
return ParallelRun(tests, lit_config, progress_callback, max_failures, timeout, workers)
class Run(object):
"""A concrete, configured testing run."""
def __init__(self, tests, lit_config, progress_callback, max_failures, timeout):
self.tests = tests
self.lit_config = lit_config
self.progress_callback = progress_callback
self.max_failures = max_failures
self.timeout = timeout
def execute(self):
"""
Execute the tests in the run using up to the specified number of
parallel tasks, and inform the caller of each individual result. The
provided tests should be a subset of the tests available in this run
object.
The progress_callback will be invoked for each completed test.
If timeout is non-None, it should be a time in seconds after which to
stop executing tests.
Returns the elapsed testing time.
Upon completion, each test in the run will have its result
computed. Tests which were not actually executed (for any reason) will
be given an UNRESOLVED result.
"""
self.failure_count = 0
self.hit_max_failures = False
# Larger timeouts (one year, positive infinity) don't work on Windows.
one_week = 7 * 24 * 60 * 60 # days * hours * minutes * seconds
timeout = self.timeout or one_week
deadline = time.time() + timeout
self._execute(deadline)
# Mark any tests that weren't run as UNRESOLVED.
for test in self.tests:
if test.result is None:
test.setResult(lit.Test.Result(lit.Test.UNRESOLVED, '', 0.0))
# TODO(yln): as the comment says.. this is racing with the main thread waiting
# for results
def _process_result(self, test, result):
# Don't add any more test results after we've hit the maximum failure
# count. Otherwise we're racing with the main thread, which is going
# to terminate the process pool soon.
if self.hit_max_failures:
return
test.setResult(result)
# Use test.isFailure() for correct XFAIL and XPASS handling
if test.isFailure():
self.failure_count += 1
if self.failure_count == self.max_failures:
self.hit_max_failures = True
self.progress_callback(test)
class SerialRun(Run):
def __init__(self, tests, lit_config, progress_callback, max_failures, timeout):
super(SerialRun, self).__init__(tests, lit_config, progress_callback, max_failures, timeout)
def _execute(self, deadline):
# TODO(yln): ignores deadline
for test in self.tests:
result = lit.worker._execute(test, self.lit_config)
self._process_result(test, result)
if self.hit_max_failures:
break
class ParallelRun(Run):
def __init__(self, tests, lit_config, progress_callback, max_failures, timeout, workers):
super(ParallelRun, self).__init__(tests, lit_config, progress_callback, max_failures, timeout)
self.workers = workers
def _execute(self, deadline):
semaphores = {
k: NopSemaphore() if v is None else
multiprocessing.BoundedSemaphore(v) for k, v in
self.lit_config.parallelism_groups.items()}
self._increase_process_limit()
# Start a process pool. Copy over the data shared between all test runs.
# FIXME: Find a way to capture the worker process stderr. If the user
# interrupts the workers before we make it into our task callback, they
# will each raise a KeyboardInterrupt exception and print to stderr at
# the same time.
pool = multiprocessing.Pool(self.workers, lit.worker.initialize,
(self.lit_config, semaphores))
self._install_win32_signal_handler(pool)
async_results = [
pool.apply_async(lit.worker.execute, args=[test],
callback=lambda r, t=test: self._process_result(t, r))
for test in self.tests]
pool.close()
for ar in async_results:
timeout = deadline - time.time()
try:
ar.get(timeout)
except multiprocessing.TimeoutError:
# TODO(yln): print timeout error
pool.terminate()
break
if self.hit_max_failures:
pool.terminate()
break
pool.join()
# TODO(yln): interferes with progress bar
# Some tests use threads internally, and at least on Linux each of these
# threads counts toward the current process limit. Try to raise the (soft)
# process limit so that tests don't fail due to resource exhaustion.
def _increase_process_limit(self):
ncpus = lit.util.detectCPUs()
desired_limit = self.workers * ncpus * 2 # the 2 is a safety factor
# Importing the resource module will likely fail on Windows.
try:
import resource
NPROC = resource.RLIMIT_NPROC
soft_limit, hard_limit = resource.getrlimit(NPROC)
desired_limit = min(desired_limit, hard_limit)
if soft_limit < desired_limit:
resource.setrlimit(NPROC, (desired_limit, hard_limit))
self.lit_config.note('Raised process limit from %d to %d' % \
(soft_limit, desired_limit))
except Exception as ex:
# Warn, unless this is Windows, in which case this is expected.
if os.name != 'nt':
self.lit_config.warning('Failed to raise process limit: %s' % ex)
def _install_win32_signal_handler(self, pool):
if lit.util.win32api is not None:
def console_ctrl_handler(type):
print('\nCtrl-C detected, terminating.')
pool.terminate()
pool.join()
lit.util.abort_now()
return True
lit.util.win32api.SetConsoleCtrlHandler(console_ctrl_handler, True)
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