def data_event(self, executor):
self.logger.debug("Event received")
if executor.terminated:
self._push_to_db(executor)
else:
workload = '.'.join(executor.current_workload.split('.')[1:6])
if 'metrics' not in executor.metadata:
executor.metadata['metrics'] = {}
steady_state = True
metrics = {}
for metric in ('lat_ns.mean', 'iops', 'bw'):
metrics[metric] = {}
for io_type in ('read', 'write'):
metrics[metric][io_type] = {}
series = self._lookup_prior_data(executor, metric, io_type)
series = self._convert_timestamps_to_samples(
executor, series)
steady = self._evaluate_prior_data(
series, executor.steady_state_samples)
self.logger.debug("Steady state for %s %s: %s" %
(io_type, metric, steady))
metrics[metric][io_type]['series'] = series
metrics[metric][io_type]['steady_state'] = steady
treated_data = DataTreatment.data_treatment(series)
metrics[metric][io_type]['slope'] = \
math.slope(treated_data['slope_data'])
metrics[metric][io_type]['range'] = \
math.range_value(treated_data['range_data'])
average = math.average(treated_data['average_data'])
metrics[metric][io_type]['average'] = average
metrics_key = '%s.%s.%s' % (workload, io_type, metric)
executor.metadata['metrics'][metrics_key] = average
if not steady:
steady_state = False
if 'report_data' not in executor.metadata:
executor.metadata['report_data'] = {}
if 'steady_state' not in executor.metadata:
executor.metadata['steady_state'] = {}
executor.metadata['report_data'][workload] = metrics
executor.metadata['steady_state'][workload] = steady_state
workload_name = executor.current_workload.split('.')[1]
if steady_state and not workload_name.startswith('_'):
executor.terminate_current_run()
def steady_state(data_series):
"""
This function seeks to detect steady state given on a measurement
window given the data series of that measurement window following
the pattern : [[x1,y1], [x2,y2], ..., [xm,ym]]. m represents the number
of points recorded in the measurement window, x which represents the
time, and y which represents the Volume performance variable being
tested e.g. IOPS, latency...
The function returns a boolean describing wether or not steady state
has been reached with the data that is passed to it.
"""
logger = logging.getLogger('storperf.utilities.steady_state')
# Pre conditioning the data to match the algorithms
treated_data = DataTreatment.data_treatment(data_series)
# Calculating useful values invoking dedicated functions
slope_value = math.slope(treated_data['slope_data'])
range_value = math.range_value(treated_data['range_data'])
average_value = math.average(treated_data['average_data'])
if (slope_value is not None and range_value is not None
and average_value is not None):
# Verification of the Steady State conditions following the SNIA
# definition
range_condition = abs(range_value) <= 0.20 * abs(average_value)
slope_condition = abs(slope_value) <= 0.10 * abs(average_value)
steady_state = range_condition and slope_condition
logger.debug("Range %s <= %s?" % (abs(range_value),
(0.20 * abs(average_value))))
logger.debug("Slope %s <= %s?" % (abs(slope_value),
(0.10 * abs(average_value))))
logger.debug("Steady State? %s" % steady_state)
else:
steady_state = False
return steady_state
def test_slope_0_in_x_and_y(self):
expected = 1.5
actual = Slope.slope([[0.0, 0], [1, 1], [2, 3]])
self.assertEqual(expected, actual)
def test_infinte_slope(self):
expected = None
actual = Slope.slope([[1480623510, 1295.87], [1480623520, 1380.79]])
self.assertEqual(expected, actual)
def test_slope_0_in_y(self):
expected = -0.5
actual = Slope.slope([[15.5, 1], [16.5, 0], [17.5, 0]])
self.assertEqual(expected, actual)
def test_slope_0_in_x(self):
expected = 1.4
actual = Slope.slope([[0, 6.0], [1, 5], [2, 7], [3, 10]])
self.assertEqual(expected, actual)
def test_slope_negative_x_series(self):
expected = 1.4
actual = Slope.slope([[-24, 6.0], [-23, 5], [-22, 7.0], [-21, 10]])
self.assertEqual(expected, actual)
def test_slope_out_of_order_series(self):
expected = 1.4
actual = Slope.slope([[2, 5.0], [4, 10], [3.0, 7], [1, 6]])
self.assertEqual(expected, actual)
def test_slope_negative_y_series(self):
expected = 2
actual = Slope.slope([[1.0, -2], [2, 2], [3, 2]])
self.assertEqual(expected, actual)
def test_slope_decimal_integer_mix(self):
expected = 1.4
actual = Slope.slope([[1.0, 6], [2, 5.0], [3, 7], [4.0, 10]])
self.assertEqual(expected, actual)
def test_slope_decimal_series(self):
expected = 1.4
actual = Slope.slope([[1.0, 6.0], [2.0, 5.0], [3.0, 7.0], [4.0, 10.0]])
self.assertEqual(expected, actual)
def test_slope_integer_series(self):
expected = 1.4
actual = Slope.slope([[1, 6], [2, 5], [3, 7], [4, 10]])
self.assertEqual(expected, actual)
def test_slope_empty_series(self):
expected = None
actual = Slope.slope([])
self.assertEqual(expected, actual)
