Delay on start session

[lervag]

Step 1: Provide a summary of your problem

After starting a session with tmuxp load <session-name>, there is a delay of some seconds before the panes accept input.

Step 2: Provide tmuxp details

• Python version: 3.7.4

• tmux version: 2.9a

• tmuxp version: 1.5.3

• tmux path: /usr/bin/tmux

• tmuxp path: /usr/bin/tmuxp

• libtmux version: 0.8.2

• shell: zsh 5.7.1

• output of tmux show-options -g:

  activity-action other
  assume-paste-time 1
  base-index 1
  bell-action any
  default-command ""
  default-shell "/usr/bin/zsh"
  default-size "80x24"
  destroy-unattached off
  detach-on-destroy on
  display-panes-active-colour red
  display-panes-colour blue
  display-panes-time 1000
  display-time 750
  history-limit 20480
  key-table "root"
  lock-after-time 0
  lock-command "lock -np"
  message-command-style fg=yellow,bg=black
  message-style fg=colour15,bg=colour0
  mouse on
  prefix C-q
  prefix2 None
  renumber-windows off
  repeat-time 500
  set-titles off
  set-titles-string "#S:#I:#W - \"#T\" #{session_alerts}"
  silence-action other
  status on
  status-bg colour0
  status-fg colour14
  status-format[0] "#[align=left range=left #{status-left-style}]#{T;=/#{status-left-length}:status-left}#[norange default]#[list=on align=#{status-justify}]#[list=left-marker]<#[list=right-marker]>#[list=on]#{W:#[range=window|#{window_index} #{window-status-style}#{?#{&&:#{window_last_flag},#{!=:#{window-status-last-style},default}}, #{window-status-last-style},}#{?#{&&:#{window_bell_flag},#{!=:#{window-status-bell-style},default}}, #{window-status-bell-style},#{?#{&&:#{||:#{window_activity_flag},#{window_silence_flag}},#{!=:#{window-status-activity-style},default}}, #{window-status-activity-style},}}]#{T:window-status-format}#[norange default]#{?window_end_flag,,#{window-status-separator}},#[range=window|#{window_index} list=focus #{?#{!=:#{window-status-current-style},default},#{window-status-current-style},#{window-status-style}}#{?#{&&:#{window_last_flag},#{!=:#{window-status-last-style},default}}, #{window-status-last-style},}#{?#{&&:#{window_bell_flag},#{!=:#{window-status-bell-style},default}}, #{window-status-bell-style},#{?#{&&:#{||:#{window_activity_flag},#{window_silence_flag}},#{!=:#{window-status-activity-style},default}}, #{window-status-activity-style},}}]#{T:window-status-current-format}#[norange list=on default]#{?window_end_flag,,#{window-status-separator}}}#[nolist align=right range=right #{status-right-style}]#{T;=/#{status-right-length}:status-right}#[norange default]"
  status-format[1] "#[align=centre]#{P:#{?pane_active,#[reverse],}#{pane_index}[#{pane_width}x#{pane_height}]#[default] }"
  status-interval 15
  status-justify left
  status-keys vi
  status-left " "
  status-left-length 10
  status-left-style default
  status-position bottom
  status-right "#[fg=colour15] #S "
  status-right-length 40
  status-right-style default
  status-style fg=colour14,bg=colour0
  update-environment[0] "DISPLAY"
  update-environment[1] "KRB5CCNAME"
  update-environment[2] "SSH_ASKPASS"
  update-environment[3] "SSH_AUTH_SOCK"
  update-environment[4] "SSH_AGENT_PID"
  update-environment[5] "SSH_CONNECTION"
  update-environment[6] "WINDOWID"
  update-environment[7] "XAUTHORITY"
  visual-activity off
  visual-bell off
  visual-silence off
  word-separators " -_@"
  

• output of tmux show-window-options -g:

  aggressive-resize off
  allow-rename off
  alternate-screen on
  automatic-rename on
  automatic-rename-format "#{?pane_in_mode,[tmux],#{pane_current_command}}#{?pane_dead,[dead],}"
  clock-mode-colour blue
  clock-mode-style 24
  main-pane-height 24
  main-pane-width 80
  mode-keys vi
  mode-style fg=black,bg=yellow
  monitor-activity off
  monitor-bell on
  monitor-silence 0
  other-pane-height 0
  other-pane-width 0
  pane-active-border-style fg=colour12
  pane-base-index 1
  pane-border-format "#{?pane_active,#[reverse],}#{pane_index}#[default] \"#{pane_title}\""
  pane-border-status off
  pane-border-style fg=colour12
  remain-on-exit off
  synchronize-panes off
  window-active-style default
  window-size smallest
  window-status-activity-style reverse
  window-status-bell-style reverse
  window-status-current-format "#I:#W#{?window_flags,#{window_flags}, }"
  window-status-current-style fg=colour15
  window-status-format "#I:#W#{?window_flags,#{window_flags}, }"
  window-status-last-style default
  window-status-separator " "
  window-status-style default
  window-style default
  wrap-search on
  xterm-keys on
  

• output of tmuxp freeze <SESSION_NAME>:

  session_name: NAME
  windows:
  - focus: 'true'
    layout: 088f,213x53,0,0{106x53,0,0,1,106x53,107,0,2}
    options:
      automatic-rename: 'off'
    panes:
    - shell_command:
      - cd ~/test
      - nvim
    - focus: 'true'
      shell_command: cd ~/test/src
    window_name: dev
  

Step 3: Describe your environment

• OS version: Arch Linux

Step 4: Describe the problem:

Steps to reproduce:

1. Create following yaml session file (e.g. ~/.tmuxp/test.yaml):

   session_name: test
   windows:
   - panes:
       - exit

2. Start session with time tmuxp load test.

Observed Results:

Loading and exiting session takes ~10 seconds.

Expected Results:

Loading and exiting session should be near immediate.

Comment

With some help I might be able to debug this myself. At least I am willing to try. But I would be interested to know if this is immediately reproducable by any of the more experienced devs first.

[lervag]

Additional input: The problem seems to have partly been reported by @oblitum already in November 2017, see #316 (comment):

The message "no previous window" always shows up when switching to tmuxp created sessions. Not only it shows up, I've noticed there's now quite a delay for the layout to load up when running tmuxp load -y ./foo.yaml. It spends some seconds in a blank state before the layout loads.

This seems to summarize my issue almost perfectly. The issue has existed for me for a long time, probably since before November 2017.

[lervag]

It seems the delay is caused by my shell (zsh), which for some reason gives large delays when starting in a seemingly random way. The issue was related to compinit, and I solved it by ensuring that the zcompdump file is only generated once a day, i.e. with

# Load completion modules
autoload -Uz compinit

# Flush cached completion configuration once every day
if [[ -n ~/.zcompdump(#qN.mh+24) ]]; then
  compinit
else
  compinit -C
fi

[oblitum]

@lervag I have that same setting as that in my .zshrc but it doesn't help fixing the problem, still same "no previous window" message (which shows up not only when starting the session, but anytime I switch back to it), still same delay. Was just giving it a try again, sadly, time to go back to tmuxp 1.3.2/libtmux 0.7.4...

[luc-vocab]

Hi, i'm also having this issue with "no previous window" displayed when switching sessions with a keybinding, in my case it seems to happen when sessions are created with tmuxp when another session previously exists, and only if the session has a single window.