[Python-Dev] To reduce Python "application" startup time

Nathaniel Smith njs at pobox.com
Tue Sep 5 16:11:50 EDT 2017

On Tue, Sep 5, 2017 at 11:13 AM, Jelle Zijlstra
<jelle.zijlstra at gmail.com> wrote:
> 2017-09-05 6:02 GMT-07:00 INADA Naoki <songofacandy at gmail.com>:
>> With this profile, I tried optimize `python -c 'import asyncio'`, logging
>> and http.client.
>> https://gist.github.com/methane/1ab97181e74a33592314c7619bf34233#file-0-optimize-import-patch
> This patch moves a few imports inside functions. I wonder whether that kind
> of change actually helps with real applications—doesn't any real application
> end up importing the socket module anyway at some point?

I don't know if this particular change is worthwhile, but one place
where startup slowness is particularly noticed is with commands like
'foo.py --help' or 'foo.py --generate-completions' (the latter called
implicitly by hitting <tab> in some shell), which typically do lots of
imports that end up not being used.


Nathaniel J. Smith -- https://vorpus.org

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