Date: Thu, 11 Apr 2019 16:04:31 +0200 From: Konstantin Schukraft <konstantin@schukraft.org> To: Alexander Zagrebin <alex@zagrebin.ru> Cc: ports@freebsd.org Subject: Re: python 3 subprocess performance Message-ID: <20190411140431.b3s2yt4bvmrusqsc@laparbeit> In-Reply-To: <20190411161649.1b740d21@vm2.home.zagrebin.ru> References: <20190411161649.1b740d21@vm2.home.zagrebin.ru>
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Hi,
>I've noticed the subprocess performance issue with python 3.
>For example, this simple script takes just 0,15 second to complete
>with python 2.7, but more than 5 sec with python 3.6:
>
>import subprocess
>
>for i in range(100):
> p = subprocess.Popen(['uname', '-a'], stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
> (stdoutdata, stderrdata) = p.communicate()
>
>Profiling with the cProfile shows, that this excessive 5 seconds was
>wasted in the "{built-in method posix.read}"
>
>Could anybody confirm this issue?
I see this on HardenedBSD 12 with python2.7 (fast) and python3.6 and 3.7
(both slow) installed from packages.
Interestingly, I don't see this on my FreeNAS 11.3, where python2.7 and
3.6 are both installed by default and run fast.
Hope that helps,
Konstantin
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