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I'd like to profile the performance of tmux. In particular how fast starting up a session is (and maybe also attaching to a session). I'm especially interested in how the content of my .tmux.conf file affects startup times (I use plugins).

How could I measure that in an objective way?

As an example of what I'm interested in, I run this to profile the startup times of my zsh setup.

repeat 5 {/usr/bin/time zsh -i -c exit}

I've tried automating things with commands like the one below, but I can't figure out how to get timings. Also, this seems to execute asynchonously, the command finishes before the session is killed.

tmux new-session -d -s test && tmux send-keys "exit" Enter
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You could do something like this for startup time:

date +%T.%N; tmux -Ltest new -d 'date +%T.%N; sleep 10'
tmux -Ltest capturep -p|sed '/^$/d'
tmux -Ltest kill-server

You can also add -vv to tmux and you will get a log file with timestamps, but it will take some interpretation...

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  • I can't manage to capture anything. tmux -L test capturep -p doesn't output anything but empty lines Commented Nov 22, 2019 at 17:49
  • It works for me, maybe your date doesn't work or doesn't have %N. What if you do "new -d 'echo xyz; sleep 10'"? Commented Nov 22, 2019 at 18:12
  • Just empty lines Commented Nov 22, 2019 at 18:41
  • Strange, if you attach you don't see anything either? Even if you scroll into the history with C-b [? Commented Nov 22, 2019 at 18:54
  • If I attach I see the output in the pane. Commented Nov 22, 2019 at 19:20

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