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
would you be able to track that down to some specific gcc-11 package
version?
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https://bugs.launchpad.net/bugs/1965451
Title:
C++ performance got worse going from Ubuntu 20 to Ubuntu 21
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).
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