[Python-Dev] [Core-mentorship] C version of weakrefset.py.

Brett Cannon brett at python.org
Fri Jun 23 12:19:46 EDT 2017

On Thu, 22 Jun 2017 at 16:26 Bhavishya <bhavishyagopesh at gmail.com> wrote:

> Also I saw your conversation with "Brett Cannon" on lazy-loading some
> modules at  startup, and also doing so using ModuleProxy(also several
> implementations that exist like importlib's Lazyloader
> <https://docs.python.org/3/library/importlib.html?highlight=lazy%20import#importlib.util.LazyLoader.factory>,
> PEAK <http://peak.telecommunity.com/DevCenter/Importing> ).
> So your suggestion's on this too?

As stated earlier, if you wish to discuss seeing if lazy loading will help
in Python's startup performance then please start a thread over at
speed at python.org and we can discuss it there.


> Thank You
> regards,
> Bhavishya
> On Thu, Jun 22, 2017 at 7:24 PM, Bhavishya <bhavishyagopesh at gmail.com>
> wrote:
>> Hello,
>> 1)I might be totally wrong here, but even if we go with stripping
>> annotation(in .pyc)...still the "lag" that comes from ABCs needs to be
>> addressed.
>> 2) I been reading for past few days about your fat-optimizer project and
>> the corresponding TO-DO list, if you think that PEP-0511 should be
>> improved, I can work on that.
>> 3)Also I was seeing to existing repos which implement some-kind of
>> optimizaton, like
>> numpy,snake-oil....
>> Finally I wanted to decide upon a roadmap, so that I could put more
>> specific efforts.(fat optimizer?)
>> Thank You
>> Regards,
>> Bhavishya
>> On Wed, Jun 21, 2017 at 8:05 PM, Victor Stinner <victor.stinner at gmail.com
>> > wrote:
>>> 2017-06-21 15:21 GMT+02:00 INADA Naoki <songofacandy at gmail.com>:
>>> > ABC slowdown Python startup only 2ms.  But importing typing module
>>> take 11ms.
>>> > While typing is not imported from site.py, many new Python application
>>> > will import it.
>>> > It may take over 100ms for applications or libraries heavily depending
>>> on ABCs.
>>> When typing is not used in the application, only used for static
>>> checks, you can try to "strip" annotations to avoid any overhead on
>>> the application startup. It's not only a matter of "import typing",
>>> it's also the cost of instanciating types like "List[int]" (or even
>>> more complex ones).
>>> I discussed with Jukka Lehtosalo at Pycon US about stripping
>>> completely annotations. He told me that my PEP 511 may be a good
>>> solution to keep annotation in the .py code, but strip them for
>>> "production code", in the cached .pyc files:
>>> "PEP 511 -- API for code transformers"
>>> https://www.python.org/dev/peps/pep-0511/
>>> This PEP is somehow controversal. Some people fear that it would allow
>>> people to hack the Python language to write their own incompatible
>>> variant of Python. I don't think that my PEP adds anything new, it's
>>> already possible to do that, importlib made it even more easy. I used
>>> my FAT Python optimizer project to sell this PEP. Since FAT Python is
>>> also controversal (it hasn't been proved to be actually faster), the
>>> PEP didn't go far at my last attempt.
>>> Note: Is core-menthorship the best place for such performance
>>> discussion? :-) Maybe we should open a thread on python-dev@ or speed@
>>> mailing list.
>>> Victor
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