2a6eab04b1
bring the debugger to the desired state. This patch makes BenchBase inherit from TestBase, instead of Base (which is a parent class of TestBase). This is so that we can also enjoy the Pythonic way of bringing the lldb debugger to a desired state before running the benchmark and collect statistics. llvm-svn: 142562
102 lines
3.0 KiB
Python
102 lines
3.0 KiB
Python
import time
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from lldbtest import *
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class Stopwatch(object):
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"""Stopwatch provides a simple utility to start/stop your stopwatch multiple
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times. Each start/stop is equal to a lap, with its elapsed time accumulated
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while measurment is in progress.
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When you're ready to start from scratch for another round of measurements,
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be sure to call the reset() method.
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For example,
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sw = Stopwatch()
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for i in range(1000):
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with sw:
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# Do some length operations...
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...
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# Get the average time.
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avg_time = sw.avg()
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# Reset the stopwatch as we are about to perform other kind of operations.
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sw.reset()
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...
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"""
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#############################################################
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#
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# Context manager interfaces to support the 'with' statement.
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#
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#############################################################
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def __enter__(self):
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"""
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Context management protocol on entry to the body of the with statement.
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"""
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return self.start()
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def __exit__(self, type, value, tb):
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"""
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Context management protocol on exit from the body of the with statement.
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"""
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self.stop()
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def reset(self):
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self.__laps__ = 0
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self.__total_elapsed__ = 0.0
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self.__start__ = None
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self.__stop__ = None
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self.__elapsed__ = 0.0
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def __init__(self):
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self.reset()
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def start(self):
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if self.__start__ is None:
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self.__start__ = time.time()
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else:
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raise Exception("start() already called, did you forget to stop() first?")
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# Return self to facilitate the context manager __enter__ protocol.
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return self
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def stop(self):
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if self.__start__ is not None:
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self.__stop__ = time.time()
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elapsed = self.__stop__ - self.__start__
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self.__total_elapsed__ += elapsed
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self.__laps__ += 1
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self.__start__ = None # Reset __start__ to be None again.
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else:
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raise Exception("stop() called without first start()?")
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def laps(self):
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"""Gets the number of laps. One lap is equal to a start/stop action."""
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return self.__laps__
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def avg(self):
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"""Equal to total elapsed time divided by the number of laps."""
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return self.__total_elapsed__ / self.__laps__
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def __str__(self):
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return "Avg: %f (Laps: %d, Total Elapsed Time: %f)" % (self.avg(),
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self.__laps__,
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self.__total_elapsed__)
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class BenchBase(TestBase):
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"""
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Abstract base class for benchmark tests.
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"""
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def setUp(self):
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"""Fixture for unittest test case setup."""
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super(BenchBase, self).setUp()
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#TestBase.setUp(self)
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self.stopwatch = Stopwatch()
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def tearDown(self):
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"""Fixture for unittest test case teardown."""
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super(BenchBase, self).setUp()
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#TestBase.tearDown(self)
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del self.stopwatch
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