CODEWITHSUNDEEP
pythonsubprocessgevent
lz96
lz96

Reputation: 2998

python: gevent's monkey.patch_all makes subprocess.check_all much slower

Here is the test script:

from gevent.monkey import patch_all; patch_all()
import subprocess
from subprocess import STDOUT                                                                        
from tempfile import NamedTemporaryFile
import datetime

with NamedTemporaryFile() as f:
    print('Subprocess call at {}'.format(datetime.datetime.now()))
    ret = subprocess.check_call(['iptables', '-t', 'mangle', '-L', '-vx'], stdout = f, stderr = STDOUT)
    print('Subprocess call end at {}'.format(datetime.datetime.now()))

With patch_all, the execution time is usually about 600ms, and that without patch_all is only ~30ms. Therefore, I was wondering what makes this happen, and what can I do to reduce the latency?

Upvotes: 0

Views: 390

Answers (1)

lz96
lz96

Reputation: 2998

Well, it seems that this is a known issue of gevent itself. Maybe the only thing I can do is to either rollback it to 1.1a1 or wait for 1.3b2. Another solution could be passing subprocess=False to patch_all()

Upvotes: 1

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