On Tue, 2021-09-28 at 10:22 +0200, Marc-Andre Lemburg wrote: > On 27.09.2021 18:51, Eric Snow wrote: > > We've frozen most of the stdlib modules imported during "python -c > > pass" [1][2], to make startup a bit faster. Import of those modules > > is controlled by "-X frozen_modules=[on|off]". Currently it defaults > > to "off" but we'd like to default to "on". The blocker is the impact > > on contributors. I expect many will make changes to a stdlib module > > and then puzzle over why those changes aren't getting used. That's an > > annoyance we can avoid, which is the point of this thread. > > > > Possible solutions: > > > > 1. always default to "on" (the annoyance for contributors isn't big enough?) > > 2. default to "on" if it's a PGO build (and "off" otherwise) > > 3. default to "on" unless running from the source tree > > > > Thoughts? > > #3 sounds like a good solution, but how would you detect "running > from the source tree" ? This sounds like you need another stat call > somewhere, which is what the frozen modules try to avoid.
It does. FYI, here's the sysconfig implementation https://github.com/python/cpython/blob/main/Lib/sysconfig.py#L146-L181 But a more efficient way to do this could be added. > I'd like to suggest adding an environment variable to enable / > disable the setting instead. This makes it easy to customize the > behavior without introducing complicated logic. > From your followup reply, it seems like you are suggesting that it should be enabled by default, and use a env var to disable it. That would have the same problem regarding the annoyance of contributors. Is there any reason why you would prefer that over #2? That seems like the best option to me if #3 is not feasible. Cheers :) Filipe Laíns
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