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# Copyright 2017 The Emscripten Authors. All rights reserved.
# Emscripten is available under two separate licenses, the MIT license and the
# University of Illinois/NCSA Open Source License. Both these licenses can be
# found in the LICENSE file.
from __future__ import print_function
import multiprocessing
import os
import subprocess
import sys
import unittest
import tempfile
from tools.tempfiles import try_delete
import queue
except ImportError:
# Python 2 compatibility
import Queue as queue
def g_testing_thread(work_queue, result_queue, temp_dir):
for test in iter(lambda: get_from_queue(work_queue), None):
result = BufferedParallelTestResult()
except unittest.SkipTest as e:
result.addSkip(test, e)
except Exception as e:
result.addError(test, e)
class ParallelTestSuite(unittest.BaseTestSuite):
"""Runs a suite of tests in parallel.
Creates worker threads, manages the task queue, and combines the results.
def __init__(self):
super(ParallelTestSuite, self).__init__()
self.processes = None
self.result_queue = None
def run(self, result):
test_queue = self.create_test_queue()
results = self.collect_results()
return self.combine_results(result, results)
def create_test_queue(self):
test_queue = multiprocessing.Queue()
for test in self.reversed_tests():
return test_queue
def reversed_tests(self):
"""A list of this suite's tests in reverse order.
Many of the tests in test_core are intentionally named so that long tests
fall toward the end of the alphabet (e.g. test_the_bullet). Tests are
loaded in alphabetical order, so here we reverse that in order to start
running longer tasks earlier, which should lead to better core utilization.
Future work: measure slowness of tests and sort accordingly.
tests = []
for test in self:
return tests[::-1]
def init_processes(self, test_queue):
self.processes = []
self.result_queue = multiprocessing.Queue()
self.dedicated_temp_dirs = [tempfile.mkdtemp() for x in range(num_cores())]
for temp_dir in self.dedicated_temp_dirs:
p = multiprocessing.Process(target=g_testing_thread,
args=(test_queue, self.result_queue, temp_dir))
def collect_results(self):
buffered_results = []
while len(self.processes):
res = get_from_queue(self.result_queue)
if res is not None:
for temp_dir in self.dedicated_temp_dirs:
return buffered_results
def clear_finished_processes(self):
self.processes = [p for p in self.processes if p.is_alive()]
def combine_results(self, result, buffered_results):
print('DONE: combining results on main thread')
# Sort the results back into alphabetical order. Running the tests in
# parallel causes mis-orderings, this makes the results more readable.
results = sorted(buffered_results, key=lambda res: str(res.test))
for r in results:
return result
class BufferedParallelTestResult(object):
"""A picklable struct used to communicate test results across processes
Fulfills the interface for unittest.TestResult
def __init__(self):
self.buffered_result = None
def test(self):
return self.buffered_result.test
def updateResult(self, result):
def startTest(self, test):
def stopTest(self, test):
def addSuccess(self, test):
print(test, '... ok', file=sys.stderr)
self.buffered_result = BufferedTestSuccess(test)
def addSkip(self, test, reason):
print(test, "... skipped '%s'" % reason, file=sys.stderr)
self.buffered_result = BufferedTestSkip(test, reason)
def addFailure(self, test, err):
print(test, '... FAIL', file=sys.stderr)
self.buffered_result = BufferedTestFailure(test, err)
def addError(self, test, err):
print(test, '... ERROR', file=sys.stderr)
self.buffered_result = BufferedTestError(test, err)
class BufferedTestBase(object):
"""Abstract class that holds test result data, split by type of result."""
def __init__(self, test, err=None):
self.test = test
if err:
exctype, value, tb = err
if exctype == subprocess.CalledProcessError:
# multiprocess.Queue can't serialize a subprocess.CalledProcessError.
# This is a bug in python 2.7 (
exctype = Exception
value = Exception(str(value))
self.error = exctype, value, FakeTraceback(tb)
def updateResult(self, result):
assert False, 'Base class should not be used directly'
class BufferedTestSuccess(BufferedTestBase):
def updateResult(self, result):
class BufferedTestSkip(BufferedTestBase):
def __init__(self, test, reason):
self.test = test
self.reason = reason
def updateResult(self, result):
result.addSkip(self.test, self.reason)
class BufferedTestFailure(BufferedTestBase):
def updateResult(self, result):
result.addFailure(self.test, self.error)
class BufferedTestError(BufferedTestBase):
def updateResult(self, result):
result.addError(self.test, self.error)
class FakeTraceback(object):
"""A fake version of a traceback object that is picklable across processes.
Python's traceback objects contain hidden stack information that isn't able
to be pickled. Further, traceback objects aren't constructable from Python,
so we need a dummy object that fulfills its interface.
The fields we expose are exactly those which are used by
unittest.TextTestResult to show a text representation of a traceback. Any
other use is not intended.
def __init__(self, tb):
self.tb_frame = FakeFrame(tb.tb_frame)
self.tb_lineno = tb.tb_lineno
self.tb_next = FakeTraceback(tb.tb_next) if tb.tb_next is not None else None
class FakeFrame(object):
def __init__(self, f):
self.f_code = FakeCode(f.f_code)
# f.f_globals is not picklable, not used in stack traces, and needs to be iterable
self.f_globals = []
class FakeCode(object):
def __init__(self, co):
self.co_filename = co.co_filename
self.co_name = co.co_name
def num_cores():
emcc_cores = os.environ.get('PARALLEL_SUITE_EMCC_CORES') or os.environ.get('EMCC_CORES')
if emcc_cores:
return int(emcc_cores)
return multiprocessing.cpu_count()
def get_from_queue(q):
return q.get(True, 0.1)
except queue.Empty:
return None