wez
Wezterm using 22 GB of RAM?
What Operating System(s) are you seeing this problem on?
Linux X11
Which Wayland compositor or X11 Window manager(s) are you using?
I am just using almalinux9 with X11
WezTerm version
wezterm 20251025-070338-b6e75fd7
Did you try the latest nightly build to see if the issue is better (or worse!) than your current version?
Yes, and I updated the version box above to show the version of the nightly that I tried
Describe the bug
For some reason, when using wezterm with workspaces, I seem to use 11 Gb per window and eventually I have to kill the process because it makes my machine irresponsive. When I reopen the wezterm, all the workspaces are gone, which is pretty annoying, given that I work with 5-10 workspaces and I have to reopen them all over again.
To Reproduce
No response
Configuration
local wezterm = require("wezterm")
local mux = wezterm.mux
wezterm.on("gui-startup", function(cmd)
local tab, pane, window = mux.spawn_window(cmd or {})
window:gui_window():maximize()
end)
local config = wezterm.config_builder()
config.font = wezterm.font("MesloLGS Nerd Font Mono")
config.term = "xterm-256color"
config.font_size = 19
config.color_scheme = "TokyoNight"
config.scrollback_lines = 10000
config.enable_tab_bar = false
config.window_decorations = "RESIZE"
config.window_background_opacity = 0.9
config.macos_window_background_blur = 10
config.window_padding = {
top = 10,
bottom = 10,
left = 10,
right = 10,
}
config.leader = { key = "a", mods = "CTRL" , timeout_milliseconds = 2000 }
config.unix_domains = {
{
name = "unix",
},
}
config.front_end = 'Software'
config.default_domain = "unix"
local action = wezterm.action
config.keys = {
-- Copy mode
{ key = "[", mods = "LEADER", action = action.ActivateCopyMode },
-- Split into panes
{
key = "v",
mods = "LEADER",
action = action.SplitHorizontal({ domain = "CurrentPaneDomain" }),
},
{
key = "h",
mods = "LEADER",
action = action.SplitVertical({ domain = "CurrentPaneDomain" }),
},
-- Adjust size, META is ALT
{
key = "LeftArrow",
mods = "META",
action = action.AdjustPaneSize({ "Left", 5 }),
},
{
key = "RightArrow",
mods = "META",
action = action.AdjustPaneSize({ "Right", 5 }),
},
{
key = "DownArrow",
mods = "META",
action = action.AdjustPaneSize({ "Down", 5 }),
},
{
key = "UpArrow",
mods = "META",
action = action.AdjustPaneSize({ "Up", 5 }),
},
-- Zoom to pane
{
key = "z",
mods = "LEADER",
action = action.TogglePaneZoomState,
},
-- Move to other windows
{
key = "c",
mods = "LEADER",
action = action.SpawnTab("CurrentPaneDomain"),
},
{
key = "p",
mods = "LEADER",
action = action.ActivateTabRelative(-1),
},
{
key = "n",
mods = "LEADER",
action = action.ActivateTabRelative(1),
},
-- Move to other panes
{
key = "DownArrow",
mods = "CTRL",
action = action.ActivatePaneDirection "Down",
},
{
key = "UpArrow",
mods = "CTRL",
action = action.ActivatePaneDirection "Up",
},
{
key = "LeftArrow",
mods = "CTRL",
action = action.ActivatePaneDirection "Left",
},
{
key = "RightArrow",
mods = "CTRL",
action = action.ActivatePaneDirection "Right",
},
-- Move panes
{
key = "Space",
mods = "LEADER",
action = wezterm.action.RotatePanes "Clockwise"
},
{
key = '0',
mods = 'LEADER',
action = wezterm.action.PaneSelect { mode = 'SwapWithActive', },
},
{
key = "x",
mods = "LEADER",
action = action.CloseCurrentPane { confirm = true }
},
-- New workspace
{
key = "w",
mods = "LEADER",
action = wezterm.action.PromptInputLine {
description = "Enter workspace name",
action = wezterm.action_callback(function(window, pane, line)
if line then
window:perform_action(
wezterm.action.SwitchToWorkspace {
name = line,
},
pane
)
end
end),
},
},
-- List workspaces
{
key = "s",
mods = "LEADER",
action = wezterm.action.ShowLauncherArgs { flags = "FUZZY|WORKSPACES" },
},
-- Rename workspaces
{
key = 'R',
mods = 'CTRL|SHIFT',
action = wezterm.action.PromptInputLine {
description = 'Rename workspace',
action = wezterm.action_callback(function(window, pane, line)
if line then
wezterm.mux.rename_workspace(
wezterm.mux.get_active_workspace(),
line
)
end
end),
},
},
-- TMUX type of server behavior
{
key = "a",
mods = "LEADER", -- Leader + Shift + A to attach
action = action.AttachDomain("unix"),
},
{
key = "d",
mods = "LEADER",
action = action.DetachDomain({ DomainName = "unix" }),
},
-- Check domains information
{
key = "i",
mods = "LEADER",
action = wezterm.action_callback(function(window, pane)
local domain = pane:get_domain_name()
window:perform_action(wezterm.action.EmitEvent "show-domain", pane)
wezterm.log_info("Current domain: " .. domain)
end),
},
-- Debugging
{
key = "D",
mods = "CTRL|SHIFT",
action = wezterm.action.ShowDebugOverlay,
},
}
for i = 1, 9 do
table.insert(config.keys, {
key = tostring(i),
mods = "LEADER",
action = action.ActivateTab(i - 1),
})
end
return config
Expected Behavior
No response
Logs
No response
Anything else?
No response
Hi,
It seems that this mux server that I am trying to use as a replacement of TMUX is the problem.
I will disable it and keep using tmux. But there is for sure a memory leak there.
Cheers.
Further update, I see that It is not possible to dissable this mux server. I also see that others have raised this issue for instance here but I do not see any constructive discussion there.
Just in case there is still any doubt about the existence of a leak, I know that the terminal is using 12 Gb of memory because my laptop suddently freezes and slows down. I am not tracking constantly the memory usage of any program, but I will start digging if my expensive laptop with 42 GB of memory suddenly cannot cope.
In any case, I do not have time to keep digging into this, I have an actual job and I will just install a different terminal emulator
Cheers.
I’ve experienced this with it before as well, not sure what causes it. I didn’t even have a config, it was barebones and would jump to 18gb on my 16gb MacBook Air, so I’d be 10gb into swap.
