def test__a_sample_of_100_from_1000(self):
hist = Histogram(100, 0.99)
for i in range(1000):
hist.add(i)
self.assertEqual(1000, hist.get_count())
self.assertEqual(100, hist.sample.get_size())
snapshot = hist.get_snapshot()
self.assertEqual(100, snapshot.get_size())
for i in snapshot.values:
self.assertTrue(0 <= i and i <= 1000)
self.assertEqual(999, hist.get_max())
self.assertEqual(0, hist.get_min())
self.assertEqual(499.5, hist.get_mean())
self.assertAlmostEqual(83416.6666, hist.get_var(), delta=0.0001)
def test__a_sample_of_100_from_1000(self):
hist = Histogram(100, 0.99)
for i in range(1000):
hist.add(i)
self.assertEqual(1000, hist.get_count())
self.assertEqual(100, hist.sample.get_size())
snapshot = hist.get_snapshot()
self.assertEqual(100, snapshot.get_size())
for i in snapshot.values:
self.assertTrue(0 <= i and i <= 1000)
self.assertEqual(999, hist.get_max())
self.assertEqual(0, hist.get_min())
self.assertEqual(499.5, hist.get_mean())
self.assertAlmostEqual(83416.6666, hist.get_var(), delta=0.0001)
def test__a_long_wait_should_not_corrupt_sample(self):
hist = Histogram(10, 0.015, clock=self.clock)
for i in range(1000):
hist.add(1000 + i)
self.clock.add(0.1)
self.assertEqual(hist.get_snapshot().get_size(), 10)
for i in hist.sample.get_snapshot().values:
self.assertTrue(1000 <= i and i <= 2000)
self.clock.add(15 * 3600) # 15 hours, should trigger rescale
hist.add(2000)
self.assertEqual(hist.get_snapshot().get_size(), 2)
for i in hist.sample.get_snapshot().values:
self.assertTrue(1000 <= i and i <= 3000)
for i in range(1000):
hist.add(3000 + i)
self.clock.add(0.1)
self.assertEqual(hist.get_snapshot().get_size(), 10)
for i in hist.sample.get_snapshot().values:
self.assertTrue(3000 <= i and i <= 4000)
def histogram(name, value, dimensions=None):
histogram = get_metric('histogram', name, dimensions, Histogram())
histogram.add(value)
def test__a_long_wait_should_not_corrupt_sample(self):
hist = Histogram(10, 0.015, self.clock)
for i in range(1000):
hist.add(1000 + i)
self.clock.add(0.1)
self.assertEqual(hist.get_snapshot().get_size(), 10)
for i in hist.sample.get_snapshot().values:
self.assertTrue(1000 <= i and i <= 2000)
self.clock.add(15 * 3600) # 15 hours, should trigger rescale
hist.add(2000)
self.assertEqual(hist.get_snapshot().get_size(), 2)
for i in hist.sample.get_snapshot().values:
self.assertTrue(1000 <= i and i <= 3000)
for i in range(1000):
hist.add(3000 + i)
self.clock.add(0.1)
self.assertEqual(hist.get_snapshot().get_size(), 10)
for i in hist.sample.get_snapshot().values:
self.assertTrue(3000 <= i and i <= 4000)