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

Antoine Pitrou solipsis at pitrou.net
Fri May 11 11:34:26 EDT 2018

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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