Reduce shell integration prompt latency (#2109)
* Reduce shell integration prompt latency Three changes to cut ~10-15ms from every precmd/preexec cycle: 1. Use zsh/net/unix (zsocket) for socket sends when available. Eliminates fork+exec of ncat/socat/nc for every telemetry send (~3ms per send, 3-4 sends per prompt cycle). Falls back to external tools if the module is unavailable. 2. Replace _cmux_kill_process_tree (synchronous /bin/ps -ax | awk) with direct kill in _cmux_stop_pr_poll_loop. The tree-kill enumerated all system processes on every command (~5-13ms). Orphaned children (gh, sleep) finish on their own within seconds. 3. Minor savings: guard _cmux_patch_ghostty_semantic_redraw after first success, make _cmux_clear_pr_for_panel async, cache bash send tool. * Address review: process-group kill, fix clear_pr race, reorder bash init 1. Use kill -KILL -- -$PID (process-group kill) instead of plain kill. Background jobs are process-group leaders, so this kills all descendants (gh, sleep) without /bin/ps overhead. 2. Keep bash _cmux_clear_pr_for_panel synchronous to prevent race with the next report_pr from the poll loop. Zsh version uses _cmux_send_bg which is synchronous when zsocket is available. 3. Move _cmux_detect_send_tool after _cmux_fix_path in bash so the cached tool lookup runs with the final PATH. --------- Co-authored-by: Lawrence Chen <lawrencecchen@users.noreply.github.com>
This commit is contained in:
Lawrence Chen
GitHub
parent
23253e6ddf
commit
71828fe86e
2 changed files with 72 additions and 49 deletions
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@ -1,26 +1,35 @@
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# cmux shell integration for bash
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# Cache which send tool is available to avoid repeated PATH lookups.
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_CMUX_SEND_TOOL=""
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_cmux_detect_send_tool() {
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if command -v ncat >/dev/null 2>&1; then
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_CMUX_SEND_TOOL=ncat
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elif command -v socat >/dev/null 2>&1; then
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_CMUX_SEND_TOOL=socat
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elif command -v nc >/dev/null 2>&1; then
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_CMUX_SEND_TOOL=nc
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fi
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}
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# Detection deferred to after _cmux_fix_path (end of file).
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_cmux_send() {
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local payload="$1"
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if command -v ncat >/dev/null 2>&1; then
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printf '%s\n' "$payload" | ncat -w 1 -U "$CMUX_SOCKET_PATH" --send-only
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elif command -v socat >/dev/null 2>&1; then
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printf '%s\n' "$payload" | socat -T 1 - "UNIX-CONNECT:$CMUX_SOCKET_PATH" >/dev/null 2>&1
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elif command -v nc >/dev/null 2>&1; then
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# Some nc builds don't support unix sockets, but keep as a last-ditch fallback.
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#
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# Important: macOS/BSD nc will often wait for the peer to close the socket
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# after it has finished writing. cmux keeps the connection open, so
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# a plain `nc -U` can hang indefinitely and leak background processes.
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#
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# Prefer flags that guarantee we exit after sending, and fall back to a
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# short timeout so we never block sidebar updates.
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if printf '%s\n' "$payload" | nc -N -U "$CMUX_SOCKET_PATH" >/dev/null 2>&1; then
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:
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else
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printf '%s\n' "$payload" | nc -w 1 -U "$CMUX_SOCKET_PATH" >/dev/null 2>&1 || true
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fi
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fi
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case "$_CMUX_SEND_TOOL" in
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ncat)
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printf '%s\n' "$payload" | ncat -w 1 -U "$CMUX_SOCKET_PATH" --send-only
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;;
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socat)
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printf '%s\n' "$payload" | socat -T 1 - "UNIX-CONNECT:$CMUX_SOCKET_PATH" >/dev/null 2>&1
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;;
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nc)
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if printf '%s\n' "$payload" | nc -N -U "$CMUX_SOCKET_PATH" >/dev/null 2>&1; then
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:
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else
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printf '%s\n' "$payload" | nc -w 1 -U "$CMUX_SOCKET_PATH" >/dev/null 2>&1 || true
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fi
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;;
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esac
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}
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_cmux_restore_scrollback_once() {
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@ -271,6 +280,7 @@ _cmux_clear_pr_for_panel() {
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[[ -S "$CMUX_SOCKET_PATH" ]] || return 0
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[[ -n "$CMUX_TAB_ID" ]] || return 0
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[[ -n "$CMUX_PANEL_ID" ]] || return 0
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# Synchronous: must arrive before the next report_pr from the poll loop.
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_cmux_send "clear_pr --tab=$CMUX_TAB_ID --panel=$CMUX_PANEL_ID"
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}
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@ -445,9 +455,10 @@ _cmux_run_pr_probe_with_timeout() {
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_cmux_stop_pr_poll_loop() {
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if [[ -n "$_CMUX_PR_POLL_PID" ]]; then
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# Use SIGKILL directly to avoid blocking sleep in preexec.
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# The poll loop is lightweight and safe to kill abruptly.
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_cmux_kill_process_tree "$_CMUX_PR_POLL_PID" KILL
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# Process-group kill: background jobs are process-group leaders, so
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# negative PID kills the loop + all descendants (gh, sleep) without
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# the synchronous /bin/ps + awk of tree-kill (~5-13ms).
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kill -KILL -- -"$_CMUX_PR_POLL_PID" 2>/dev/null || true
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_CMUX_PR_POLL_PID=""
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fi
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}
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@ -702,4 +713,6 @@ _cmux_fix_path() {
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_cmux_fix_path
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unset -f _cmux_fix_path
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_cmux_detect_send_tool
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_cmux_install_prompt_command
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@ -1,21 +1,29 @@
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# cmux shell integration for zsh
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# Injected automatically — do not source manually
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# Prefer zsh/net/unix for socket sends (no fork, ~0.2ms per send vs ~3ms
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# for fork+exec of ncat/socat/nc). Falls back to external tools if the
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# module is unavailable.
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typeset -g _CMUX_HAS_ZSOCKET=0
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if zmodload zsh/net/unix 2>/dev/null; then
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_CMUX_HAS_ZSOCKET=1
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fi
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_cmux_send() {
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local payload="$1"
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if (( _CMUX_HAS_ZSOCKET )); then
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local fd
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zsocket "$CMUX_SOCKET_PATH" 2>/dev/null || return 1
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fd=$REPLY
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print -u $fd -r -- "$payload" 2>/dev/null
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exec {fd}>&- 2>/dev/null
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return 0
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fi
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if command -v ncat >/dev/null 2>&1; then
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print -r -- "$payload" | ncat -w 1 -U "$CMUX_SOCKET_PATH" --send-only
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elif command -v socat >/dev/null 2>&1; then
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print -r -- "$payload" | socat -T 1 - "UNIX-CONNECT:$CMUX_SOCKET_PATH" >/dev/null 2>&1
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elif command -v nc >/dev/null 2>&1; then
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# Some nc builds don't support unix sockets, but keep as a last-ditch fallback.
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#
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# Important: macOS/BSD nc will often wait for the peer to close the socket
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# after it has finished writing. cmux keeps the connection open, so
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# a plain `nc -U` can hang indefinitely and leak background processes.
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#
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# Prefer flags that guarantee we exit after sending, and fall back to a
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# short timeout so we never block sidebar updates.
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if print -r -- "$payload" | nc -N -U "$CMUX_SOCKET_PATH" >/dev/null 2>&1; then
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:
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else
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@ -24,6 +32,16 @@ _cmux_send() {
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fi
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}
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# Fire-and-forget send: synchronous when zsocket is available (fast, no fork),
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# backgrounded otherwise.
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_cmux_send_bg() {
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if (( _CMUX_HAS_ZSOCKET )); then
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_cmux_send "$1"
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else
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{ _cmux_send "$1" } >/dev/null 2>&1 &!
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fi
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}
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_cmux_restore_scrollback_once() {
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local path="${CMUX_RESTORE_SCROLLBACK_FILE:-}"
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[[ -n "$path" ]] || return 0
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@ -337,9 +355,7 @@ _cmux_report_tty_once() {
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[[ -n "$payload" ]] || return 0
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_CMUX_TTY_REPORTED=1
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{
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_cmux_send "$payload"
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} >/dev/null 2>&1 &!
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_cmux_send_bg "$payload"
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}
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_cmux_report_shell_activity_state() {
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@ -350,9 +366,7 @@ _cmux_report_shell_activity_state() {
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[[ -n "$CMUX_PANEL_ID" ]] || return 0
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[[ "$_CMUX_SHELL_ACTIVITY_LAST" == "$state" ]] && return 0
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_CMUX_SHELL_ACTIVITY_LAST="$state"
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{
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_cmux_send "report_shell_state $state --tab=$CMUX_TAB_ID --panel=$CMUX_PANEL_ID"
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} >/dev/null 2>&1 &!
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_cmux_send_bg "report_shell_state $state --tab=$CMUX_TAB_ID --panel=$CMUX_PANEL_ID"
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}
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_cmux_ports_kick() {
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@ -362,9 +376,7 @@ _cmux_ports_kick() {
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[[ -n "$CMUX_TAB_ID" ]] || return 0
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[[ -n "$CMUX_PANEL_ID" ]] || return 0
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_CMUX_PORTS_LAST_RUN=$EPOCHSECONDS
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{
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_cmux_send "ports_kick --tab=$CMUX_TAB_ID --panel=$CMUX_PANEL_ID"
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} >/dev/null 2>&1 &!
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_cmux_send_bg "ports_kick --tab=$CMUX_TAB_ID --panel=$CMUX_PANEL_ID"
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}
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_cmux_report_git_branch_for_path() {
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@ -392,7 +404,7 @@ _cmux_clear_pr_for_panel() {
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[[ -S "$CMUX_SOCKET_PATH" ]] || return 0
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[[ -n "$CMUX_TAB_ID" ]] || return 0
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[[ -n "$CMUX_PANEL_ID" ]] || return 0
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_cmux_send "clear_pr --tab=$CMUX_TAB_ID --panel=$CMUX_PANEL_ID"
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_cmux_send_bg "clear_pr --tab=$CMUX_TAB_ID --panel=$CMUX_PANEL_ID"
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}
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_cmux_pr_output_indicates_no_pull_request() {
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@ -567,9 +579,10 @@ _cmux_run_pr_probe_with_timeout() {
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_cmux_stop_pr_poll_loop() {
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if [[ -n "$_CMUX_PR_POLL_PID" ]]; then
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# Use SIGKILL directly to avoid blocking sleep in preexec.
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# The poll loop is lightweight and safe to kill abruptly.
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_cmux_kill_process_tree "$_CMUX_PR_POLL_PID" KILL
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# Process-group kill: background jobs are process-group leaders, so
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# negative PID kills the loop + all descendants (gh, sleep) without
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# the synchronous /bin/ps + awk of tree-kill (~5-13ms).
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kill -KILL -- -"$_CMUX_PR_POLL_PID" 2>/dev/null || true
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_CMUX_PR_POLL_PID=""
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fi
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}
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@ -682,7 +695,7 @@ _cmux_precmd() {
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_cmux_report_shell_activity_state prompt
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# Handle cases where Ghostty integration initializes after this file.
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_cmux_patch_ghostty_semantic_redraw
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(( _CMUX_GHOSTTY_SEMANTIC_PATCHED )) || _cmux_patch_ghostty_semantic_redraw
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if [[ -z "$_CMUX_TTY_NAME" ]]; then
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local t
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@ -717,11 +730,8 @@ _cmux_precmd() {
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# This is also the simplest way to test sidebar directory behavior end-to-end.
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if [[ "$pwd" != "$_CMUX_PWD_LAST_PWD" ]]; then
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_CMUX_PWD_LAST_PWD="$pwd"
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{
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# Quote to preserve spaces.
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local qpwd="${pwd//\"/\\\"}"
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_cmux_send "report_pwd \"${qpwd}\" --tab=$CMUX_TAB_ID --panel=$CMUX_PANEL_ID"
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} >/dev/null 2>&1 &!
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local qpwd="${pwd//\"/\\\"}"
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_cmux_send_bg "report_pwd \"${qpwd}\" --tab=$CMUX_TAB_ID --panel=$CMUX_PANEL_ID"
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fi
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# Git branch/dirty: update immediately on directory change, otherwise every ~3s.
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