[Python-Dev] Python startup time - daemon

[Guido van Rossum]

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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-- 
--Guido van Rossum (python.org/~guido)
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