| 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 |
| |
| |
| class MaxFailuresError(Exception): |
| pass |
| class TimeoutError(Exception): |
| pass |
| |
| |
| class Run(object): |
| """A concrete, configured testing run.""" |
| |
| def __init__(self, tests, lit_config, workers, progress_callback, |
| max_failures, timeout): |
| self.tests = tests |
| self.lit_config = lit_config |
| self.workers = workers |
| self.progress_callback = progress_callback |
| self.max_failures = max_failures |
| self.timeout = timeout |
| assert workers > 0 |
| |
| 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.failures = 0 |
| |
| # 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)) |
| |
| 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=self.progress_callback) |
| for test in self.tests] |
| pool.close() |
| |
| try: |
| self._wait_for(async_results, deadline) |
| except: |
| pool.terminate() |
| raise |
| finally: |
| pool.join() |
| |
| def _wait_for(self, async_results, deadline): |
| timeout = deadline - time.time() |
| for idx, ar in enumerate(async_results): |
| try: |
| test = ar.get(timeout) |
| except multiprocessing.TimeoutError: |
| raise TimeoutError() |
| else: |
| self.tests[idx] = test |
| if test.isFailure(): |
| self.failures += 1 |
| if self.failures == self.max_failures: |
| raise MaxFailuresError() |
| |
| # 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) |