def test_timer(self):
result = []
def handler(sig, frame):
result.append(None) # peano arithmetic ftw
signal.signal(signal.SIGPROF, handler)
platform.setitimer(platform.ITIMER_PROF, 0.01, 0.01)
start = time.time()
# must busy-wait because if we're sleeping python signal handlers
# don't run.
while time.time() < start + 0.5: pass
platform.setitimer(platform.ITIMER_PROF, 0, 0)
end = time.time()
elapsed = end - start
self.assertTrue(0.500 < elapsed < 0.501, elapsed)
count = len(result)
# We should have gotten ~50 timer ticks while we waited.
# in practice I see ~44 on my mac, and ~48 on a linux
# vm running on that same mac (?!)
self.assertTrue(37 < count < 55, count)
def handler(self, sig, current_frame):
start = time.time()
self.samples_remaining -= 1
if self.samples_remaining <= 0 or self.stopping:
platform.setitimer(Collector.MODES[self.mode][0], 0, 0)
self.stopped = True
return
current_tid = thread.get_ident()
for tid, frame in sys._current_frames().items():
if tid == current_tid:
frame = current_frame
frames = []
while frame is not None:
code = frame.f_code
frames.append((code.co_filename, code.co_firstlineno, code.co_name))
frame = frame.f_back
self.stack_counts[tuple(frames)] += 1
end = time.time()
self.samples_taken += 1
self.sample_time += (end - start)
def handler(self, sig, current_frame):
start = time.time()
self.samples_remaining -= 1
if self.samples_remaining <= 0 or self.stopping:
platform.setitimer(Collector.MODES[self.mode][0], 0, 0)
self.stopped = True
return
current_tid = thread.get_ident()
for tid, frame in sys._current_frames().items():
if tid == current_tid:
frame = current_frame
frames = []
while frame is not None:
code = frame.f_code
frames.append((code.co_filename, code.co_firstlineno, code.co_name))
frame = frame.f_back
self.stack_counts[tuple(frames)] += 1
end = time.time()
self.samples_taken += 1
self.sample_time += (end - start)
def test_timer(self):
result = []
def handler(sig, frame):
result.append(None) # peano arithmetic ftw
signal.signal(signal.SIGPROF, handler)
platform.setitimer(platform.ITIMER_PROF, 0.01, 0.01)
start = time.time()
# must busy-wait because if we're sleeping python signal handlers
# don't run.
while time.time() < start + 0.5:
pass
platform.setitimer(platform.ITIMER_PROF, 0, 0)
end = time.time()
elapsed = end - start
self.assertTrue(0.500 < elapsed < 0.501, elapsed)
count = len(result)
# We should have gotten ~50 timer ticks while we waited.
# in practice I see ~44 on my mac, and ~48 on a linux
# vm running on that same mac (?!)
self.assertTrue(37 < count < 55, count)
def start(self, duration = 30.0):
self.stopping = False
self.stopped = False
self.samples_remaining = int(duration / self.interval)
timer, sig = Collector.MODES[self.mode]
platform.setitimer(timer, self.interval, self.interval)
def start(self, duration=30.0):
self.stopping = False
self.stopped = False
self.samples_remaining = int(duration / self.interval)
timer, sig = Collector.MODES[self.mode]
platform.setitimer(timer, self.interval, self.interval)