Worse performance of python v3.13.2 than v3.9.21

[komh]

Bug description:

Hi/2.

I've updated python to v3.13.2 with yum. BTW, its performance is much worse than before. For example, meson setup process in dav1d repo took about 10 minutes with python v3.13.2, but about 20 seconds with python v3.9.21.

• How to reproduce

1. Clone meson from https://github.com/komh/meson-os2.git
2. Clone dav1d from https://github.com/komh/dav1d-os2.git
3. cd into dav1d repo and make a build dir and cd into it like md build && cd build
4. In build dir, launch meson like python3 x:/path/to/meson.py setup ..

CPython versions tested on:

3.13

Operating systems tested on:

Other

[TeLLie]

Hi Ko
I have also Meson installed as you know.
I cloned the dav1d from youre site
But i see no performance issue you mention
The meson setup takes about 20 sec
and compile it takes about 80 sec.
This machine only have rpm installed.

So with gcc 9.20 and youre meson build.
and the python 3.13.2

Kind regards, Tellie

[komh]

Did you test with v3.9.21, too ? I think, it will be faster.

[TeLLie]

Hi Ko No dint test that. Greetz, Tellie Op di 12 aug 2025, 04:52 schreef KO Myung-Hun ***@***.***>:

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*komh* left a comment (bitwiseworks/python-os2#34) <#34 (comment)> Did you test with v3.9.21, too ? I think, it will be faster. — Reply to this email directly, view it on GitHub <#34 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAIYTRGFKUZR2WSVOLFEPEL3NFJGFAVCNFSM6AAAAACDPO6JKSVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZTCNZXGUYTQMBXGU> . You are receiving this because you commented.Message ID: ***@***.***>

[komh]

I've found the cause. It 's the Requester service. When I stopped it, the performance problem does not occur any more.

I think, UNC path check causes this problem. Any paln to fix this ?

[SilvanScherrer]

Not really any plan, as I never see that and I don't use the Requester at all. I assume you mean the OS/2 Network Requester. If you can spot to the code at least, I will look at it.