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# Copyright 2010-present Basho Technologies, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import gc
import os
import sys
import traceback
__all__ = ["measure", "measure_with_rehearsal"]
def measure_with_rehearsal():
"""
Runs a benchmark when used as an iterator, injecting a garbage
collection between iterations. Example::
for b in riak.benchmark.measure_with_rehearsal():
with b.report("pow"):
for _ in range(10000):
math.pow(2,10000)
with b.report("factorial"):
for i in range(100):
math.factorial(i)
"""
return Benchmark(True)
def measure():
"""
Runs a benchmark once when used as a context manager. Example::
with riak.benchmark.measure() as b:
with b.report("pow"):
for _ in range(10000):
math.pow(2,10000)
with b.report("factorial"):
for i in range(100):
math.factorial(i)
"""
return Benchmark()
class Benchmark(object):
"""
A benchmarking run, which may consist of multiple steps. See
measure_with_rehearsal() and measure() for examples.
"""
def __init__(self, rehearse=False):
"""
Creates a new benchmark reporter.
:param rehearse: whether to run twice to take counter the effects
of garbage collection
:type rehearse: boolean
"""
self.rehearse = rehearse
if rehearse:
self.count = 2
else:
self.count = 1
self._report = None
def __enter__(self):
if self.rehearse:
raise ValueError("measure_with_rehearsal() cannot be used in with "
"statements, use measure() or the for..in "
"statement")
print_header()
self._report = BenchmarkReport()
self._report.__enter__()
return self
def __exit__(self, exc_type, exc_val, exc_tb):
if self._report:
return self._report.__exit__(exc_type, exc_val, exc_tb)
else:
print()
return True
def __iter__(self):
return self
def __next__(self):
"""
Runs the next iteration of the benchmark.
"""
if self.count == 0:
raise StopIteration
elif self.count > 1:
print_rehearsal_header()
else:
if self.rehearse:
gc.collect()
print("-" * 59)
print()
print_header()
self.count -= 1
return self
def report(self, name):
"""
Returns a report for the current step of the benchmark.
"""
self._report = None
return BenchmarkReport(name)
def print_rehearsal_header():
"""
Prints the header for the rehearsal phase of a benchmark.
"""
print()
print("Rehearsal -------------------------------------------------")
def print_report(label, user, system, real):
"""
Prints the report of one step of a benchmark.
"""
print("{:<12s} {:12f} {:12f} ( {:12f} )".format(label,
user,
system,
real))
def print_header():
"""
Prints the header for the normal phase of a benchmark.
"""
print("{:<12s} {:<12s} {:<12s} ( {:<12s} )"
.format("", "user", "system", "real"))
class BenchmarkReport(object):
"""
A labeled step in a benchmark. Acts as a context-manager, printing
its timing results when the context exits.
"""
def __init__(self, name="benchmark"):
self.name = name
self.start = None
def __enter__(self):
self.start = os.times()
return self
def __exit__(self, exc_type, exc_val, exc_tb):
if not exc_type:
user1, system1, _, _, real1 = self.start
user2, system2, _, _, real2 = os.times()
print_report(self.name, user2 - user1, system2 - system1,
real2 - real1)
elif exc_type is KeyboardInterrupt:
return False
else:
msg = f"EXCEPTION! type: {exc_type} val: {exc_val}"
print(msg, file=sys.stderr)
traceback.print_tb(exc_tb)
return True if exc_type is None else False