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-# Copyright 2020 Google Inc. All rights reserved.
-#
-# 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.
-"""Example of Python using C++ benchmark framework.
-
-To run this example, you must first install the `google_benchmark` Python package.
-
-To install using `setup.py`, download and extract the `google_benchmark` source.
-In the extracted directory, execute:
- python setup.py install
-"""
-
-import random
-import time
-
-import google_benchmark as benchmark
-from google_benchmark import Counter
-
-
-@benchmark.register
-def empty(state):
- while state:
- pass
-
-
-@benchmark.register
-def sum_million(state):
- while state:
- sum(range(1_000_000))
-
-@benchmark.register
-def pause_timing(state):
- """Pause timing every iteration."""
- while state:
- # Construct a list of random ints every iteration without timing it
- state.pause_timing()
- random_list = [random.randint(0, 100) for _ in range(100)]
- state.resume_timing()
- # Time the in place sorting algorithm
- random_list.sort()
-
-
-@benchmark.register
-def skipped(state):
- if True: # Test some predicate here.
- state.skip_with_error("some error")
- return # NOTE: You must explicitly return, or benchmark will continue.
-
- ... # Benchmark code would be here.
-
-
-@benchmark.register
-def manual_timing(state):
- while state:
- # Manually count Python CPU time
- start = time.perf_counter() # perf_counter_ns() in Python 3.7+
- # Something to benchmark
- time.sleep(0.01)
- end = time.perf_counter()
- state.set_iteration_time(end - start)
-
-
-@benchmark.register
-def custom_counters(state):
- """Collect cutom metric using benchmark.Counter."""
- num_foo = 0.0
- while state:
- # Benchmark some code here
- pass
- # Collect some custom metric named foo
- num_foo += 0.13
-
- # Automatic Counter from numbers.
- state.counters["foo"] = num_foo
- # Set a counter as a rate.
- state.counters["foo_rate"] = Counter(num_foo, Counter.kIsRate)
- # Set a counter as an inverse of rate.
- state.counters["foo_inv_rate"] = Counter(num_foo, Counter.kIsRate | Counter.kInvert)
- # Set a counter as a thread-average quantity.
- state.counters["foo_avg"] = Counter(num_foo, Counter.kAvgThreads)
- # There's also a combined flag:
- state.counters["foo_avg_rate"] = Counter(num_foo, Counter.kAvgThreadsRate)
-
-
-@benchmark.register
-@benchmark.option.measure_process_cpu_time()
-@benchmark.option.use_real_time()
-def with_options(state):
- while state:
- sum(range(1_000_000))
-
-
-@benchmark.register(name="sum_million_microseconds")
-@benchmark.option.unit(benchmark.kMicrosecond)
-def with_options(state):
- while state:
- sum(range(1_000_000))
-
-
-@benchmark.register
-@benchmark.option.arg(100)
-@benchmark.option.arg(1000)
-def passing_argument(state):
- while state:
- sum(range(state.range(0)))
-
-
-@benchmark.register
-@benchmark.option.range(8, limit=8 << 10)
-def using_range(state):
- while state:
- sum(range(state.range(0)))
-
-
-@benchmark.register
-@benchmark.option.range_multiplier(2)
-@benchmark.option.range(1 << 10, 1 << 18)
-@benchmark.option.complexity(benchmark.oN)
-def computing_complexity(state):
- while state:
- sum(range(state.range(0)))
- state.complexity_n = state.range(0)
-
-
-if __name__ == "__main__":
- benchmark.main()