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#!/usr/bin/env python
"""Utility code for benchmark scripts."""
__author__ = "collinwinter@google.com (Collin Winter)"
import math
import operator
try:
reduce
except NameError:
from functools import reduce
def run_benchmark(options, num_runs, bench_func, *args):
"""Run the given benchmark, print results to stdout.
Args:
options: optparse.Values instance.
num_runs: number of times to run the benchmark
bench_func: benchmark function. `num_runs, *args` will be passed to this
function. This should return a list of floats (benchmark execution
times).
"""
if options.profile:
import cProfile
prof = cProfile.Profile()
prof.runcall(bench_func, num_runs, *args)
prof.print_stats(sort=options.profile_sort)
else:
data = bench_func(num_runs, *args)
if options.take_geo_mean:
product = reduce(operator.mul, data, 1)
print(math.pow(product, 1.0 / len(data)))
else:
for x in data:
print(x)
def add_standard_options_to(parser):
"""Add a bunch of common command-line flags to an existing OptionParser.
This function operates on `parser` in-place.
Args:
parser: optparse.OptionParser instance.
"""
parser.add_option("-n", action="store", type="int", default=100,
dest="num_runs", help="Number of times to run the test.")
parser.add_option("--profile", action="store_true",
help="Run the benchmark through cProfile.")
parser.add_option("--profile_sort", action="store", type="str",
default="time", help="Column to sort cProfile output by.")
parser.add_option("--take_geo_mean", action="store_true",
help="Return the geo mean, rather than individual data.")