Add ccbench to the Tools directory
This commit is contained in:
Antoine Pitrou
parent
c9d6238b34
commit
9a386826fb
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# -*- coding: utf-8 -*-
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# This file should be kept compatible with both Python 2.6 and Python >= 3.0.
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from __future__ import division
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from __future__ import print_function
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"""
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ccbench, a Python concurrency benchmark.
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"""
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import time
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import os
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import sys
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import functools
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import itertools
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import threading
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import subprocess
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import socket
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from optparse import OptionParser, SUPPRESS_HELP
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import platform
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# Compatibility
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try:
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xrange
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except NameError:
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xrange = range
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try:
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map = itertools.imap
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except AttributeError:
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pass
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THROUGHPUT_DURATION = 2.0
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LATENCY_PING_INTERVAL = 0.1
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LATENCY_DURATION = 2.0
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def task_pidigits():
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"""Pi calculation (Python)"""
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_map = map
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_count = itertools.count
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_islice = itertools.islice
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def calc_ndigits(n):
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# From http://shootout.alioth.debian.org/
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def gen_x():
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return _map(lambda k: (k, 4*k + 2, 0, 2*k + 1), _count(1))
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def compose(a, b):
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aq, ar, as_, at = a
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bq, br, bs, bt = b
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return (aq * bq,
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aq * br + ar * bt,
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as_ * bq + at * bs,
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as_ * br + at * bt)
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def extract(z, j):
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q, r, s, t = z
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return (q*j + r) // (s*j + t)
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def pi_digits():
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z = (1, 0, 0, 1)
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x = gen_x()
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while 1:
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y = extract(z, 3)
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while y != extract(z, 4):
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z = compose(z, next(x))
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y = extract(z, 3)
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z = compose((10, -10*y, 0, 1), z)
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yield y
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return list(_islice(pi_digits(), n))
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return calc_ndigits, (50, )
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def task_regex():
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"""regular expression (C)"""
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# XXX this task gives horrendous latency results.
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import re
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# Taken from the `inspect` module
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pat = re.compile(r'^(\s*def\s)|(.*(?<!\w)lambda(:|\s))|^(\s*@)', re.MULTILINE)
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with open(__file__, "r") as f:
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arg = f.read(2000)
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def findall(s):
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t = time.time()
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try:
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return pat.findall(s)
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finally:
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print(time.time() - t)
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return pat.findall, (arg, )
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def task_sort():
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"""list sorting (C)"""
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def list_sort(l):
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l = l[::-1]
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l.sort()
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return list_sort, (list(range(1000)), )
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def task_compress_zlib():
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"""zlib compression (C)"""
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import zlib
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with open(__file__, "rb") as f:
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arg = f.read(5000) * 3
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def compress(s):
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zlib.decompress(zlib.compress(s, 5))
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return compress, (arg, )
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def task_compress_bz2():
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"""bz2 compression (C)"""
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import bz2
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with open(__file__, "rb") as f:
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arg = f.read(3000) * 2
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def compress(s):
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bz2.compress(s)
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return compress, (arg, )
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def task_hashing():
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"""SHA1 hashing (C)"""
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import hashlib
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with open(__file__, "rb") as f:
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arg = f.read(5000) * 30
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def compute(s):
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hashlib.sha1(s).digest()
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return compute, (arg, )
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throughput_tasks = [task_pidigits, task_regex]
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for mod in 'bz2', 'hashlib':
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try:
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globals()[mod] = __import__(mod)
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except ImportError:
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globals()[mod] = None
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# For whatever reasons, zlib gives irregular results, so we prefer bz2 or
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# hashlib if available.
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# (NOTE: hashlib releases the GIL from 2.7 and 3.1 onwards)
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if bz2 is not None:
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throughput_tasks.append(task_compress_bz2)
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elif hashlib is not None:
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throughput_tasks.append(task_hashing)
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else:
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throughput_tasks.append(task_compress_zlib)
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latency_tasks = throughput_tasks
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class TimedLoop:
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def __init__(self, func, args):
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self.func = func
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self.args = args
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def __call__(self, start_time, min_duration, end_event, do_yield=False):
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step = 20
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niters = 0
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duration = 0.0
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_time = time.time
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_sleep = time.sleep
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_func = self.func
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_args = self.args
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t1 = start_time
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while True:
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for i in range(step):
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_func(*_args)
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t2 = _time()
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# If another thread terminated, the current measurement is invalid
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# => return the previous one.
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if end_event:
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return niters, duration
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niters += step
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duration = t2 - start_time
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if duration >= min_duration:
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end_event.append(None)
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return niters, duration
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if t2 - t1 < 0.01:
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# Minimize interference of measurement on overall runtime
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step = step * 3 // 2
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elif do_yield:
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# OS scheduling of Python threads is sometimes so bad that we
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# have to force thread switching ourselves, otherwise we get
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# completely useless results.
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_sleep(0.0001)
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t1 = t2
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def run_throughput_test(func, args, nthreads):
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assert nthreads >= 1
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# Warm up
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func(*args)
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results = []
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loop = TimedLoop(func, args)
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end_event = []
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if nthreads == 1:
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# Pure single-threaded performance, without any switching or
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# synchronization overhead.
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start_time = time.time()
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results.append(loop(start_time, THROUGHPUT_DURATION,
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end_event, do_yield=False))
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return results
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started = False
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ready_cond = threading.Condition()
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start_cond = threading.Condition()
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ready = []
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def run():
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with ready_cond:
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ready.append(None)
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ready_cond.notify()
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with start_cond:
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while not started:
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start_cond.wait()
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results.append(loop(start_time, THROUGHPUT_DURATION,
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end_event, do_yield=True))
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threads = []
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for i in range(nthreads):
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threads.append(threading.Thread(target=run))
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for t in threads:
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t.setDaemon(True)
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t.start()
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# We don't want measurements to include thread startup overhead,
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# so we arrange for timing to start after all threads are ready.
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with ready_cond:
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while len(ready) < nthreads:
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ready_cond.wait()
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with start_cond:
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start_time = time.time()
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started = True
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start_cond.notify(nthreads)
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for t in threads:
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t.join()
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return results
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def run_throughput_tests(max_threads):
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for task in throughput_tasks:
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print(task.__doc__)
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print()
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func, args = task()
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nthreads = 1
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baseline_speed = None
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while nthreads <= max_threads:
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results = run_throughput_test(func, args, nthreads)
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# Taking the max duration rather than average gives pessimistic
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# results rather than optimistic.
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speed = sum(r[0] for r in results) / max(r[1] for r in results)
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print("threads=%d: %d" % (nthreads, speed), end="")
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if baseline_speed is None:
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print(" iterations/s.")
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baseline_speed = speed
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else:
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print(" ( %d %%)" % (speed / baseline_speed * 100))
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nthreads += 1
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print()
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LAT_END = "END"
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def _sendto(sock, s, addr):
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sock.sendto(s.encode('ascii'), addr)
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def _recv(sock, n):
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return sock.recv(n).decode('ascii')
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def latency_client(addr, nb_pings, interval):
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sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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_time = time.time
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_sleep = time.sleep
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def _ping():
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_sendto(sock, "%r\n" % _time(), addr)
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# The first ping signals the parent process that we are ready.
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_ping()
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# We give the parent a bit of time to notice.
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_sleep(1.0)
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for i in range(nb_pings):
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_sleep(interval)
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_ping()
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_sendto(sock, LAT_END + "\n", addr)
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def run_latency_client(**kwargs):
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cmd_line = [sys.executable, '-E', os.path.abspath(__file__)]
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cmd_line.extend(['--latclient', repr(kwargs)])
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return subprocess.Popen(cmd_line) #, stdin=subprocess.PIPE,
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#stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
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def run_latency_test(func, args, nthreads):
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# Create a listening socket to receive the pings. We use UDP which should
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# be painlessly cross-platform.
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sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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sock.bind(("127.0.0.1", 0))
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addr = sock.getsockname()
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interval = LATENCY_PING_INTERVAL
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duration = LATENCY_DURATION
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nb_pings = int(duration / interval)
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results = []
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threads = []
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end_event = []
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start_cond = threading.Condition()
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started = False
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if nthreads > 0:
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# Warm up
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func(*args)
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results = []
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loop = TimedLoop(func, args)
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ready = []
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ready_cond = threading.Condition()
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def run():
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with ready_cond:
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ready.append(None)
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ready_cond.notify()
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with start_cond:
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while not started:
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start_cond.wait()
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loop(start_time, duration * 1.5, end_event, do_yield=False)
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for i in range(nthreads):
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threads.append(threading.Thread(target=run))
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for t in threads:
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t.setDaemon(True)
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t.start()
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# Wait for threads to be ready
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with ready_cond:
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while len(ready) < nthreads:
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ready_cond.wait()
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# Run the client and wait for the first ping(s) to arrive before
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# unblocking the background threads.
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chunks = []
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process = run_latency_client(addr=sock.getsockname(),
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nb_pings=nb_pings, interval=interval)
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s = _recv(sock, 4096)
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_time = time.time
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with start_cond:
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start_time = _time()
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started = True
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start_cond.notify(nthreads)
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while LAT_END not in s:
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s = _recv(sock, 4096)
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t = _time()
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chunks.append((t, s))
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# Tell the background threads to stop.
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end_event.append(None)
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for t in threads:
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t.join()
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process.wait()
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for recv_time, chunk in chunks:
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# NOTE: it is assumed that a line sent by a client wasn't received
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# in two chunks because the lines are very small.
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for line in chunk.splitlines():
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line = line.strip()
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if line and line != LAT_END:
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send_time = eval(line)
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assert isinstance(send_time, float)
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results.append((send_time, recv_time))
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return results
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def run_latency_tests(max_threads):
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for task in latency_tasks:
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print("Background CPU task:", task.__doc__)
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print()
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func, args = task()
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nthreads = 0
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while nthreads <= max_threads:
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results = run_latency_test(func, args, nthreads)
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n = len(results)
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# We print out milliseconds
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lats = [1000 * (t2 - t1) for (t1, t2) in results]
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#print(list(map(int, lats)))
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avg = sum(lats) / n
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dev = (sum((x - avg) ** 2 for x in lats) / n) ** 0.5
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print("CPU threads=%d: %d ms. (std dev: %d ms.)" % (nthreads, avg, dev), end="")
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print()
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#print(" [... from %d samples]" % n)
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nthreads += 1
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print()
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def main():
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usage = "usage: %prog [-h|--help] [options]"
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parser = OptionParser(usage=usage)
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parser.add_option("-t", "--throughput",
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action="store_true", dest="throughput", default=False,
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help="run throughput tests")
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parser.add_option("-l", "--latency",
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action="store_true", dest="latency", default=False,
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help="run latency tests")
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parser.add_option("-i", "--interval",
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action="store", type="int", dest="check_interval", default=None,
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help="sys.setcheckinterval() value")
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parser.add_option("-I", "--switch-interval",
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action="store", type="float", dest="switch_interval", default=None,
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help="sys.setswitchinterval() value")
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parser.add_option("-n", "--num-threads",
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action="store", type="int", dest="nthreads", default=4,
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help="max number of threads in tests")
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# Hidden option to run the pinging client
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parser.add_option("", "--latclient",
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action="store", dest="latclient", default=None,
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help=SUPPRESS_HELP)
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options, args = parser.parse_args()
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if args:
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parser.error("unexpected arguments")
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if options.latclient:
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kwargs = eval(options.latclient)
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latency_client(**kwargs)
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return
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if not options.throughput and not options.latency:
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options.throughput = options.latency = True
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if options.check_interval:
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sys.setcheckinterval(options.check_interval)
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if options.switch_interval:
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sys.setswitchinterval(options.switch_interval)
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print("== %s %s (%s) ==" % (
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platform.python_implementation(),
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platform.python_version(),
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platform.python_build()[0],
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))
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# Processor identification often has repeated spaces
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cpu = ' '.join(platform.processor().split())
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print("== %s %s on '%s' ==" % (
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platform.machine(),
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platform.system(),
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cpu,
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))
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print()
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if options.throughput:
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print("--- Throughput ---")
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print()
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run_throughput_tests(options.nthreads)
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if options.latency:
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print("--- Latency ---")
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print()
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run_latency_tests(options.nthreads)
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if __name__ == "__main__":
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main()
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