Bug#1114896: xgboost: flaky autopkgtest on amd64: sometimes quick, sometimes times out

[Shengqi Chen <harry@debian.org>]

Hi,

> 2025年9月11日 18:50，Paul Gevers <elbrus@debian.org> 写道：
> 
> I looked at the results of the autopkgtest of your package. I noticed
> that it regularly times out after 2:47h on amd64 while some runs are
> quick and everything in between. On other architectures the tests seem
> to only take minutes. I'm wondering if the test is extremely sensitive
> to the load of the system and/or the available memory and cores. Our
> amd64 worker has 64 cores and 256 GB RAM.

Thank you for raising this to attention. I tried autopkgtest on some of
my machines, and they all finished really fast (~1min), including:

- Intel Core i9 14900K
- Intel Xeon E5-2680v4
- Intel Xeon Platinum 8358
- AMD EPYC 7742 / 7763

I’m not quite sure why it would be ridiculously slow on debci machines.
Is it possible there are major ISA differences (e.g. AVX disabled), or
something like cpu / memory over-subscription?

Thanks,
Shengqi Chen