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https://github.com/nmasur/dotfiles
synced 2026-09-08 21:46:07 +00:00
Noah Masur
d4e56dd190
A/B in a live lagging shell: disabling fish_autosuggestion_enabled cures the lag instantly, and re-enabling does NOT bring it back — the toggle resets the wedged reader state. __autosuggestion_unwedge (fish_postexec) now applies that reset after every command, at the moment TUIs exit. Builtins only, invisible, respects a deliberate manual disable. Flight recorder stays armed until the hook is proven in real use. Also from this investigation: wedged-thread evidence (sampler attach cures), lag-sample tool, flight recorder in the zellij fish wrapper.
54 lines
2.2 KiB
Fish
54 lines
2.2 KiB
Fish
# Capture stack samples of this fish process, the zellij server, and the
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# zellij client WHILE the typing lag is happening. This names the guilty
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# component directly: if fish's main thread is busy/blocked per keystroke the
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# stacks show exactly where; if fish is idle while typing feels laggy, the
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# delay is in zellij's render path instead.
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#
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# CAUTION (learned 2026-08-30): attaching the sampler to a lagging fish CURES
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# the lag (thread suspend/resume unwedges it), so run this from a DIFFERENT
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# pane with the lagging shell's pid: `lag-sample <pid>` (get it in the lagging
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# shell with the builtin-only `echo $fish_pid`). Have someone type in the
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# lagging pane while sampling runs — the first samples may catch the wedge.
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# With no argument it samples the current shell.
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set -l target $fish_pid
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if test (count $argv) -ge 1; and test -n "$argv[1]"
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set target $argv[1]
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end
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set -l outdir ~/.local/state/lag-triage
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mkdir -p $outdir
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set -l ts (date +%Y%m%d-%H%M%S)
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set -l dur 8
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set -l fishfile $outdir/sample-$ts-fish-$target.txt
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/usr/bin/sample $target $dur 1 -file $fishfile &>/dev/null &
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disown
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# this session's zellij server (socket path ends in the session name)
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set -l serverpid (pgrep -f "zellij --server.*/$ZELLIJ_SESSION_NAME\$")
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test -z "$serverpid"; and set serverpid (pgrep -f "zellij --server" | head -3)
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for pid in $serverpid
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/usr/bin/sample $pid $dur 1 -file $outdir/sample-$ts-zellij-server-$pid.txt &>/dev/null &
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disown
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end
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# zellij clients (attached to ghostty): named zellij but without --server args
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set -l allserver (pgrep -f "zellij --server")
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set -l clientpid
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for pid in (pgrep -x zellij)
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contains $pid $allserver; or set -a clientpid $pid
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end
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for pid in $clientpid[1..3]
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/usr/bin/sample $pid $dur 1 -file $outdir/sample-$ts-zellij-client-$pid.txt &>/dev/null &
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disown
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end
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# notify when done, without occupying the commandline
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fish -c "sleep (math $dur + 2); echo; echo '== lag-sample done: '$outdir'/sample-$ts-*.txt =='" &
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disown
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echo "Sampling fish (pid $target), zellij server(s) [$serverpid], client(s) [$clientpid] for $dur s."
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echo ">>> TYPE CONTINUOUSLY IN THE LAGGING PANE NOW (junk text is fine) <<<"
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echo "Files: $outdir/sample-$ts-*.txt"
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