[Python-Dev] Python startup time - daemon (original) (raw)

Guido van Rossum guido at python.org
Fri May 11 12:23:31 EDT 2018

Indeed, we have an implementation of this specific to mypy.

On Fri, May 11, 2018 at 11:34 AM, Antoine Pitrou <solipsis at pitrou.net> wrote:

Yes, you don't want this to be a generic utility, rather a helper library that people can integrate into their command-line applications to enable such startup caching. Regards Antoine.

On Fri, 11 May 2018 17:27:35 +0200 Oleg Broytman <phd at phdru.name> wrote: > On Fri, May 11, 2018 at 07:38:05AM -0700, Chris Barker - NOAA Federal via Python-Dev <python-dev at python.org> wrote: > > Could one make a little startup utility that, when invoked the first > > time, starts up a raw python interpreter, keeps it running somewhere, > > and then forks it to run the actual python code. > > > > Then every invocation after that would make a new fork. > > Used to be implemented (and discussed in this list) many times. Just > a few examples: > > http://readyexec.sourceforge.net/ > https://blogs.gnome.org/johan/2007/01/18/introducing-python-launcher/ > > Proven to be hard and never gain any traction. > > a) you don't want the daemon to import all possible modules so you need > to run a separate copy of the daemon for every Python version, every > user and every client program; > b) you need to find "your" daemon - using TCP? unix sockets? named pipes? > b) need to redirect stdio to/from the daemon; > c) need to redirect signals and exceptions; > d) have problems with elevated privileges (how do you elevate the daemon > if the client was started with sudo -H?); > e) not portable (there is a popular GUI that cannot fork). > > > -CHB > > Sent from my iPhone > > Oleg.

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