Replies: 11 comments 41 replies
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Discussion until we can debug and extract some actionable info. We have a lot of arch users. |
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This solution is not working for me. Ubuntu 24.04 6.8.0-51-generic. Rebuilt as above, and am still seeing high wa in top Ghostty 1.0.0 Version
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chiming in to confirm that building against epoll worked for me on kernel 6.8: |
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@alslater there are two users for whom the solution worked well on Ubuntu 24.04 with kernel version 6.8.0-51. You can try grep -R 'const xev = @import("xev"' .
./src/cli/version.zig:const xev = @import("xev").Epoll;
./src/os/cf_release_thread.zig:const xev = @import("xev").Epoll;
./src/renderer/Metal.zig:const xev = @import("xev").Epoll;
./src/renderer/Thread.zig:const xev = @import("xev").Epoll;
./src/termio/backend.zig:const xev = @import("xev").Epoll;
./src/termio/Exec.zig:const xev = @import("xev").Epoll;
./src/termio/mailbox.zig:const xev = @import("xev").Epoll;
./src/termio/Options.zig:const xev = @import("xev").Epoll;
./src/termio/stream_handler.zig:const xev = @import("xev").Epoll;
./src/termio/Termio.zig:const xev = @import("xev").Epoll;
./src/termio/Thread.zig:const xev = @import("xev").Epoll;
./src/global.zig:const xev = @import("xev").Epoll;
./src/main_ghostty.zig:const xev = @import("xev").Epoll;All those files must have the content as shown, using Epoll. After that you must compile. |
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@plinkr Hmm. OK, my bad. It seems that I must have still had a ghostty window opened somewhere when I recompiled/reinstalled, I use gtk-single-instance = true. After actually killing all windows and restarting, the issue is fixed. |
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Arch user here (Cinnamon desktop, 6.12.7 kernel), can confirm that the epoll fix here works. I can also confirm that without it, |
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I'm also on Arch (Plasma 6.2.4, Linux-LTS 6.6.67, Intel Kabylake GPU) and seeing high iowait. It goes up by about 23 at first launch and then an extra 13 for every tab launched. Curiously, I was first alerted because Plasma's System Monitor was showing 100% Total Usage on two cores, increasing by an extra two cores for roughly every two tabs. Turns out that figure includes iowait. |
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Quick update - I've just tested on the following:
All have the same issue (I used |
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I'm experiencing the same cpu hogging on Ubuntu 24.04, using kernel 6.8.0-51-generic CPU: 11th Gen Intel(R) Core(TM) i7-1185G7 |
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I can also report this issue on amd64 Gentoo CPU: 12th Gen Intel(R) Core(TM) i7-1260P |
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Most of the time I only use one instance of Ghostty since I use tmux, but I just checked for that exact problem after seeing that discussion and it looks like it is here. Though I don't think I would have seen that problem if I hadn't known before... |
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I can also report the same issue on Manjaro under Plasma 6.2.4-1, with kernel 6.6.65-1-MANJARO |
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@plinkr's solution above works for me too. |
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Add me as well. I didn't find this thread because it seemed to be labelled as Arch and Intel, and here I am on Ubuntu with a Ryzen 7840u system... Kernel 6.8.0, custom ghostty build > 1.0.1 build to test a fix for #4605. Noticed the high wait times the last week on my system, but no slowdowns, or fan noise, or battery issues. But changing this code brings my CPU idle right back to 99% with 0% waits, and it reassures my head a bit 😉. |
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The PR in libxev has waitid feature, but not merged, you can try it, the PR you mention doesnot relate this issue |
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I did not say it was... |
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Same on Arch with hardened kernel |
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related: axboe/liburing#943 |
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Great find |
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I have this issue on nixos how can I implement @plinkr 's solution? |
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I'm having some trouble getting this to work. I'm using the official flake as an input: {
...
inputs.ghostty.url = "github:ghostty-org/ghostty";
...
}I'm trying to work out how to apply the overlay to the flake input rather than nixpkgs, since the above will not work. |
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For the flake, remove the previous overlay and add the following to home.packages or environment.systemPackages (inputs.ghostty.packages.${pkgs.system}.default.overrideAttrs (old: {
preBuild =
(old.preBuild or [ ])
+ ''
# use Epoll due to io_uring spamming iowait
shopt -s globstar
sed -i 's/^const xev = @import("xev");$/const xev = @import("xev").Epoll;/' **/*.zig
shopt -u globstar
'';
})) |
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This has solved it. Thank you very much @qubitnano |
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love it! but how can I make it an overlay and not a package? or is that impossible? |
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Yes you can also set ghostty to that override in an overlay as well to just set ghostty in your packages. |
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same problem :-( |
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Same here on NixOS using the official flake. Rev:
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I read source code libxev, Epoll uses single thread, io_uring uses multi threads. When ghostty starts, it holds io_exec - shell. and when io_uring is coming, per tab will handle per io_exec per thread while EPoll only triggers event for specific thread's event. Then it's not kernel issue. |
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Seeing the same behavior on Arch using latest ghostty build via AUR. |
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and others
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Package is installed from
extrarepo.It's basically unusable. Each new tab and new line of output adds iowait. There is a plenty of RAM available. No disk usage. strace also shows no any weird behaviour.
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