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#!/usr/bin/env python
# $Id$
"""
A simle benchmark script which compares plain send() and sendfile()
performances in terms of CPU time spent and bytes transmitted in
one second.
This is what I get on my Linux 2.6.38 box, AMD dual core 1.6 GHz:
send()
cpu: 28.41 usec/pass
rate: 362.13 MB/sec
sendfile()
cpu: 11.25 usec/pass
rate: 848.56 MB/sec
Works with both python 2.X and 3.X.
"""
from __future__ import with_statement
import socket
import os
import errno
import timeit
import time
import atexit
import sys
import optparse
import threading
import itertools
import signal
import contextlib
from multiprocessing import Process
from sendfile import sendfile
# overridable defaults
HOST = "127.0.0.1"
PORT = 8022
BIGFILE = "$testfile1"
BIGFILE_SIZE = 1024 * 1024 * 1024 # 1 GB
BUFFER_SIZE = 65536
def print_(s, hilite=False):
if hilite:
bold = '1'
s = '\x1b[%sm%s\x1b[0m' % (';'.join([bold]), s)
sys.stdout.write(s + "\n")
sys.stdout.flush()
# python 3 compatibility layer
def b(s):
return bytes(s, 'ascii') if sys.version_info >= (3,) else s
def create_file(filename, size):
with open(filename, 'wb') as f:
bytes = 0
chunk = b("x") * BUFFER_SIZE
while 1:
f.write(chunk)
bytes += len(chunk)
if bytes >= size:
break
def safe_remove(file):
try:
os.remove(file)
except OSError:
pass
class Spinner(threading.Thread):
def run(self):
self._exit = False
self._spinner = itertools.cycle('-\|/')
while not self._exit:
sys.stdout.write(next(self._spinner) + "\b")
sys.stdout.flush()
time.sleep(.1)
def stop(self):
self._exit = True
self.join()
class Client:
def __init__(self):
self.sock = socket.socket()
self.sock.connect((HOST, PORT))
self.sock.settimeout(1)
def retr(self):
with contextlib.closing(self.sock):
while 1:
data = self.sock.recv(BUFFER_SIZE)
if not data:
break
def retr_for_1_sec(self):
with contextlib.closing(self.sock):
stop_at = time.time() + 1
bytes_recv = 0
while stop_at > time.time():
chunk = self.sock.recv(BUFFER_SIZE)
if not chunk:
assert 0
bytes_recv += len(chunk)
return bytes_recv
def start_server(use_sendfile, keep_sending=False):
"""A simple test server which sends a file once a client connects.
use_sendfile decides whether using sendfile() or plain send().
If keep_sending is True restart sending file when EOF is reached.
"""
sock = socket.socket()
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
sock.bind((HOST, PORT))
sock.listen(1)
conn, addr = sock.accept()
sock.close()
file = open(BIGFILE, 'rb')
def on_exit(signum, fram):
file.close();
conn.close()
sys.exit(0)
signal.signal(signal.SIGTERM, on_exit)
signal.signal(signal.SIGINT, on_exit)
if not use_sendfile:
while 1:
chunk = file.read(BUFFER_SIZE)
if not chunk:
# EOF
if keep_sending:
file.seek(0)
continue
else:
break
conn.sendall(chunk)
else:
offset = 0
sockno = conn.fileno()
fileno = file.fileno()
while 1:
try:
sent = sendfile(sockno, fileno, offset, BUFFER_SIZE)
except OSError:
err = sys.exc_info()[1]
if err.errno in (errno.EAGAIN, errno.EBUSY):
continue
raise
else:
if not sent:
# EOF
if keep_sending:
offset = 0
continue
else:
break
else:
offset += sent
def main():
parser = optparse.OptionParser()
parser.add_option('-k', '--keepfile', action="store_true", default=False,
help="do not remove test file on exit")
options, args = parser.parse_args()
if not options.keepfile:
atexit.register(lambda: safe_remove(BIGFILE))
if not os.path.exists(BIGFILE) or os.path.getsize(BIGFILE) < BIGFILE_SIZE:
print_("creating big file...")
create_file(BIGFILE, BIGFILE_SIZE)
print_("starting benchmark...")
# CPU time: use sendfile()
server = Process(target=start_server, kwargs={"use_sendfile":True})
server.start()
time.sleep(0.1)
t1 = timeit.Timer(setup="from __main__ import Client; client = Client()",
stmt="client.retr()").timeit(number=1)
server.terminate()
server.join()
# CPU time: use send()
server = Process(target=start_server, kwargs={"use_sendfile":False})
server.start()
time.sleep(0.1)
t2 = timeit.Timer(setup="from __main__ import Client; client = Client()",
stmt="client.retr()").timeit(number=1)
server.terminate()
server.join()
# MB/sec: use sendfile()
server = Process(target=start_server, kwargs={"use_sendfile":True,
"keep_sending":True})
server.start()
time.sleep(0.1)
client = Client()
bytes1 = client.retr_for_1_sec()
server.terminate()
server.join()
# MB/sec: use sendfile()
server = Process(target=start_server, kwargs={"use_sendfile":False,
"keep_sending":True})
server.start()
time.sleep(0.1)
client = Client()
bytes2 = client.retr_for_1_sec()
server.terminate()
server.join()
print_(" ")
print_("send()", hilite=True)
print_(" cpu: %7.2f usec/pass" % (1000000 * t2 / 100000))
print_(" rate: %7.2f MB/sec" % round(bytes2 / 1024.0 / 1024.0, 2))
print_("")
print_("sendfile()", hilite=True)
print_(" cpu: %7.2f usec/pass" % (1000000 * t1 / 100000))
print_(" rate: %7.2f MB/sec" % round(bytes1 / 1024.0 / 1024.0, 2))
if __name__ == '__main__':
s = Spinner()
s.start()
try:
main()
finally:
s.stop()
|
