[Python-Dev] importlib

[Brett Cannon]

On Wed, Jul 14, 2010 at 13:01, Antoine Pitrou <solipsis at pitrou.net> wrote:
> On Wed, 14 Jul 2010 12:33:55 -0700
> Brett Cannon <brett at python.org> wrote:
>>
>> So I started writing benchmark code in anticipation of needing to prove a
>> minimal performance difference to justify bootstrapping importlib. Right now
>> it only compares importing from sys.modules and built-in modules. You can
>> run it with ``./python.exe -m importlib.test.benchmark``. If you add a `-b`
>> option that will use the built-in __import__ implementation.
>
> In what unit are the numbers?

Imports/second. I'll fix the code to state that.

>
> In any case, here my results under a Linux system:
>
> $ ./python -m importlib.test.benchmark
> sys.modules [ 323782 326183 326667 ] best is 326667
> Built-in module [ 33600 33693 33610 ] best is 33693
>
> $ ./python -m importlib.test.benchmark -b
> sys.modules [ 1297640 1315366 1292283 ] best is 1315366
> Built-in module [ 58180 57708 58057 ] best is 58180

And this is what might make evaluating importlib tough; while the
performance is 25% of what it is for import.c, being able to import
over 300,000 times/second is still damn fast.