It also looks like it already happened on 5.14, so I would be looking at
commits between 5.13 and 5.14:
Linux-5.13.0-40-generic-x86_64-with-glibc2.29
c++ g++ (Ubuntu 9.4.0-1ubuntu1~20.04.1) 9.4.0 1.524 1.507
8.431 2.278
Linux-5.14.10-300.fc35.x86_64-x86_64-with-glibc2.34
c++ g
Hi Matthias,
it seems like the "bug" (performance slow down) is not dependent on gcc version
(it happens with both gcc9 and gcc11):
https://www.frisky.world/2022/04/testing-ubuntu-2204-lts-jammy-jellyfish.html
but rather dependent on kernel version (5.13 linux kernel was faster than 5.15
linux
And if you really need repro steps, which I think are quite obvious
A.1. Install Ubuntu 20
A.2. git clone https://github.com/pepe78/python-performance
A.3. cd python-performance
A.4. ./run.sh
B.1. Install Ubuntu 21
B.2. git clone https://github.com/pepe78/python-performance
B.3. cd python-perform
That's a bummer! I think it's not too challenging to download Ubuntu 20
and Ubuntu 21 and test it out. :) (I really don't care that much that
C++ gets slow... while it's a bummer, it's not a show stopper).
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is sub
Public bug reported:
This is not a bug, more of a degradation of performance report.
Going from Ubuntu 20 to Ubuntu 21 (and same on Ubuntu 22 pre-release), I
noticed that C++ performance got worse, while it stayed the same for
pypy:
Ubuntu 21:
pypy1.419s 1.387s 8.527% 2.469%
c++ 1.843
