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Thread: 24.04 considerably slower than 20.04

  1. #21
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    Re: 24.04 considerably slower than 20.04

    For the program listed a couple of posts above, I used default compile options which includes dynamic libraries. Those would be different between 20.04 and 24.04. I compiled with 20.04 specifying static so as to eliminate that test variable (observe how much bigger the executable is, because it includes the needed libraries):

    Code:
    doug@s19:~/idle/self-contained-test$ cc -static pingpong.c -o pingpong
    doug@s19:~/idle/self-contained-test$ ls -l
    total 892
    -rwxrwxr-x 1 doug doug 876240 Jan 24 14:50 pingpong
    -rw-rw-r-- 1 doug doug   8874 Jan 23 08:03 pingpong.c
    -rwxrwxr-x 1 doug doug  17304 Jan 23 08:04 pingpong-dyn
    -rwxr-xr-x 1 doug doug    980 Jan 23 08:03 ping-pong-many-parallel
    EDIT: And, finally as earlier requested, kernel 6.6.0-14-generic. the average difference was 19.40%
    perfstatic66.png
    Attached Images Attached Images
    Last edited by Doug S; January 25th, 2024 at 04:49 PM.
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  2. #22
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    Re: 24.04 considerably slower than 20.04

    This thread is about differences between 20.04 and 24.04. So what about 22.04.3 LTS?
    perfstatic66-and-22-04.jpg
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  3. #23
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    Re: 24.04 considerably slower than 20.04

    Quote Originally Posted by jbicha View Post
    Generally, developers don't read this forum. If you want developers to see your post, a better place is https://discourse.ubuntu.com/

    But your tests would be more interesting if they used Ubuntu kernels. I don't know if the Ubuntu 24.04 LTS kernel would boot on 20.04 LTS; I don't have any need myself to be trying alternative kernels.
    Hi Jeremy, or anybody:

    What category and tag would you suggest I use for creating a topic on discourse? There doesn't seem to be something like a "development" category. I suppose "discussion" could be the tag. Maybe the "Uncategorized" category?
    Any follow-up information on your issue would be appreciated. Please have the courtesy to report back.

  4. #24
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    Re: 24.04 considerably slower than 20.04

    For this topic, I suggest the Kernel category.

  5. #25
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    Re: 24.04 considerably slower than 20.04

    Quote Originally Posted by Doug S View Post
    This thread is about differences between 20.04 and 24.04. So what about 22.04.3 LTS?
    The stats I gave you were from 22.04.3 with 6.5.0.and 6.7.0. But those were the early commands you had me run.

    Since then, I uninstalled 6.7.0 from Mainline, as it breaks ZFS, and when it updates, drops my ZFS-On-Root Install from the Grub Boot menus. LOL

    Still getting those other stat's for you between 22.04 and 24.04.

    Yes, I am a plus 1 to choose topic "Kernel"

    "Concurrent coexistence of Windows, Linux and UNIX..." || Ubuntu user # 33563, Linux user # 533637
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  6. #26
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    Re: 24.04 considerably slower than 20.04

    Quote Originally Posted by jbicha View Post
    For this topic, I suggest the Kernel category.
    Okay, thanks.

    Please see https://discourse.ubuntu.com/t/24-04...ge-cases/41987
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  7. #27
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    Re: 24.04 considerably slower than 20.04

    Quote Originally Posted by MAFoElffen View Post
    The stats I gave you were from 22.04.3 with 6.5.0.and 6.7.0. But those were the early commands you had me run.

    Since then, I uninstalled 6.7.0 from Mainline, as it breaks ZFS, and when it updates, drops my ZFS-On-Root Install from the Grub Boot menus. LOL

    Still getting those other stat's for you between 22.04 and 24.04.

    Yes, I am a plus 1 to choose topic "Kernel"
    Thanks. I am curious what you get. I now suggest 40 ping pong pairs:

    Code:
    ./ping-pong-many-parallel 0 30000000 40
    Any follow-up information on your issue would be appreciated. Please have the courtesy to report back.

  8. #28
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    Re: 24.04 considerably slower than 20.04

    Mike or anybody willing to do the test described in post #19 above: It can now be done on one 24.04 system only with the only variable between test runs being this addition to whatever is already on the grub command line:

    Code:
    systemd.unified_cgroup_hierarchy=0
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