#
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# The ASF licenses this file to You 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
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# http://www.apache.org/licenses/LICENSE-2.0
#
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#
"""Utility functions for all microbenchmarks."""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
import collections
import gc
import importlib
import os
import time
import numpy
[docs]def check_compiled(module):
"""Check whether given module has been compiled.
Args:
module: string, module name
"""
check_module = importlib.import_module(module)
ext = os.path.splitext(check_module.__file__)[-1]
if ext in ('.py', '.pyc'):
raise RuntimeError(
"Profiling uncompiled code.\n"
"To compile beam, run "
"'pip install Cython; python setup.py build_ext --inplace'")
[docs]class BenchmarkConfig(
collections.namedtuple(
"BenchmarkConfig", ["benchmark", "size", "num_runs"])):
"""
Attributes:
benchmark: a callable that takes an int argument - benchmark size,
and returns a callable. A returned callable must run the code being
benchmarked on an input of specified size.
For example, one can implement a benchmark as:
class MyBenchmark(object):
def __init__(self, size):
[do necessary initialization]
def __call__(self):
[run the code in question]
size: int, a size of the input. Aggregated per-element metrics
are counted based on the size of the input.
num_runs: int, number of times to run each benchmark.
"""
def __str__(self):
return "%s, %s element(s)" % (
getattr(self.benchmark, '__name__', str(self.benchmark)),
str(self.size))
[docs]def run_benchmarks(benchmark_suite, verbose=True):
"""Runs benchmarks, and collects execution times.
A simple instrumentation to run a callable several times, collect and print
its execution times.
Args:
benchmark_suite: A list of BenchmarkConfig.
verbose: bool, whether to print benchmark results to stdout.
Returns:
A dictionary of the form string -> list of floats. Keys of the dictionary
are benchmark names, values are execution times in seconds for each run.
"""
def run(benchmark_fn, size):
# Contain each run of a benchmark inside a function so that any temporary
# objects can be garbage-collected after the run.
benchmark_instance_callable = benchmark_fn(size)
start = time.time()
_ = benchmark_instance_callable()
return time.time() - start
cost_series = collections.defaultdict(list)
for benchmark_config in benchmark_suite:
name = str(benchmark_config)
num_runs = benchmark_config.num_runs
size = benchmark_config.size
for run_id in range(num_runs):
# Do a proactive GC before each run to minimize side-effects of different
# runs.
gc.collect()
time_cost = run(benchmark_config.benchmark, size)
cost_series[name].append(time_cost)
if verbose:
per_element_cost = time_cost / size
print("%s: run %d of %d, per element time cost: %g sec" % (
name, run_id + 1, num_runs, per_element_cost))
if verbose:
print("")
if verbose:
pad_length = max([len(str(bc)) for bc in benchmark_suite])
for benchmark_config in benchmark_suite:
name = str(benchmark_config)
per_element_median_cost = (
numpy.median(cost_series[name]) / benchmark_config.size)
std = numpy.std(cost_series[name]) / benchmark_config.size
print("%s: per element median time cost: %g sec, relative std: %.2f%%" % (
name.ljust(pad_length, " "), per_element_median_cost,
std * 100 / per_element_median_cost))
return cost_series