ghostty-gpu-check
This commit is contained in:
John Lancaster
Executable
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#!/usr/bin/env bash
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set -u
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# --- pretty output helpers ---
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BOLD="\033[1m"
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DIM="\033[2m"
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GREEN="\033[32m"
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YELLOW="\033[33m"
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RED="\033[31m"
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CYAN="\033[36m"
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RESET="\033[0m"
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section() {
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echo
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echo -e "${BOLD}${CYAN}==> $1${RESET}"
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}
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ok() { echo -e "${GREEN}[OK]${RESET} $1"; }
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warn() { echo -e "${YELLOW}[WARN]${RESET} $1"; }
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err() { echo -e "${RED}[ERR]${RESET} $1"; }
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info() { echo -e "${DIM}$1${RESET}"; }
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has_cmd() {
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command -v "$1" >/dev/null 2>&1
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}
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found_process=0
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found_render_node=0
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found_gpu_libs=0
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software_rasterizer=0
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section "1) Find a running Ghostty process"
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info "What this does: tries the same two process lookups you ran (pgrep and pidof)."
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info "Good outcome: at least one PID is returned."
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echo -e "${DIM}\$ pgrep -x ghostty${RESET}"
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PGREP_OUT="$(pgrep -x ghostty || true)"
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if [[ -n "${PGREP_OUT}" ]]; then
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echo "${PGREP_OUT}"
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else
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echo "<no output>"
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fi
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echo -e "${DIM}\$ pidof ghostty${RESET}"
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PIDOF_OUT="$(pidof ghostty || true)"
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if [[ -n "${PIDOF_OUT}" ]]; then
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echo "${PIDOF_OUT}"
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else
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echo "<no output>"
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fi
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if [[ -n "${PGREP_OUT}" || -n "${PIDOF_OUT}" ]]; then
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found_process=1
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ok "Ghostty process detected."
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else
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warn "No Ghostty process found yet by either command."
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fi
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section "2) Set GHOSTTY_PID"
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info "What this does: picks one Ghostty PID for all later checks."
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info "Good outcome: GHOSTTY_PID is set to a valid running Ghostty process."
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# Prefer step-1 outputs first (avoids re-running lookups that may block on some systems).
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GHOSTTY_PID=""
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if [[ -n "${PGREP_OUT}" ]]; then
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GHOSTTY_PID="$(printf '%s\n' "${PGREP_OUT}" | head -n1)"
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info "Using PID from step-1 pgrep output."
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elif [[ -n "${PIDOF_OUT}" ]]; then
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GHOSTTY_PID="$(printf '%s\n' "${PIDOF_OUT}" | awk '{print $1}')"
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info "Using PID from step-1 pidof output."
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else
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echo -e "${DIM}\$ pgrep -xo ghostty${RESET}"
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if has_cmd timeout; then
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PGREP_RAW="$(timeout 3s pgrep -xo ghostty 2>&1)"
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pgrep_status=$?
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if (( pgrep_status == 124 )); then
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warn "pgrep timed out after 3 seconds."
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fi
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else
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PGREP_RAW="$(pgrep -xo ghostty 2>&1)"
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pgrep_status=$?
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fi
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if (( pgrep_status == 0 )); then
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GHOSTTY_PID="$(printf '%s\n' "${PGREP_RAW}" | head -n1)"
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else
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if [[ -n "${PGREP_RAW}" ]]; then
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warn "[pgrep] ${PGREP_RAW}"
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fi
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warn "pgrep exit code: ${pgrep_status} (1 usually means no matching process)."
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echo -e "${DIM}\$ pidof ghostty${RESET}"
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PIDOF_RAW="$(pidof ghostty 2>&1)"
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pidof_status=$?
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if (( pidof_status == 0 )); then
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GHOSTTY_PID="$(printf '%s\n' "${PIDOF_RAW}" | awk '{print $1}')"
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else
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if [[ -n "${PIDOF_RAW}" ]]; then
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warn "[pidof] ${PIDOF_RAW}"
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fi
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warn "pidof exit code: ${pidof_status}"
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GHOSTTY_PID=""
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fi
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fi
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fi
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if [[ -z "${GHOSTTY_PID}" ]]; then
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err "Could not find a running Ghostty process to inspect."
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echo "Open Ghostty, then run this script again."
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exit 1
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fi
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export GHOSTTY_PID
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ok "Using GHOSTTY_PID=${GHOSTTY_PID}"
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section "3) Check for an open GPU render device"
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info "What this does: inspects /proc/<pid>/fd for /dev/dri entries used for rendering."
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info "Good outcome: see /dev/dri/renderD* (for example renderD128)."
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if has_cmd rg; then
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echo -e "${DIM}\$ sudo ls -l /proc/\$GHOSTTY_PID/fd | rg dri${RESET}"
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DRI_LINES="$(sudo ls -l "/proc/${GHOSTTY_PID}/fd" | rg dri || true)"
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else
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warn "'rg' not found; using grep instead"
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echo -e "${DIM}\$ sudo ls -l /proc/\$GHOSTTY_PID/fd | grep dri${RESET}"
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DRI_LINES="$(sudo ls -l "/proc/${GHOSTTY_PID}/fd" | grep dri || true)"
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fi
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if [[ -n "${DRI_LINES}" ]]; then
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echo "${DRI_LINES}"
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else
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echo "<no dri-related file descriptors found>"
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fi
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if echo "${DRI_LINES}" | grep -q '/dev/dri/renderD'; then
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found_render_node=1
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ok "Found /dev/dri/renderD*: strong sign Ghostty is using GPU render infrastructure."
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elif [[ -n "${DRI_LINES}" ]]; then
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warn "Found /dev/dri entries, but no renderD node in this output."
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else
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warn "No /dev/dri entries seen for this process."
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fi
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section "4) Check mapped graphics libraries"
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info "What this does: reads process memory mappings for GL/EGL/Vulkan/Mesa libraries."
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info "Good outcome: matches like libGL, libEGL, libvulkan, mesa, libgbm, libgallium appear."
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echo -e "${DIM}\$ sudo grep -E 'libEGL|libGL|libvulkan|mesa' /proc/\$GHOSTTY_PID/maps | head -n 30${RESET}"
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LIB_LINES="$(sudo grep -E 'libEGL|libGL|libvulkan|mesa' "/proc/${GHOSTTY_PID}/maps" | head -n 30 || true)"
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if [[ -n "${LIB_LINES}" ]]; then
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echo "${LIB_LINES}"
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found_gpu_libs=1
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ok "Graphics stack libraries are mapped into Ghostty."
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else
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echo "<no matches>"
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warn "No GL/EGL/Vulkan/Mesa mappings matched this filter."
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fi
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section "5) Optional probe for software rasterizer vs hardware driver hints"
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info "What this does: scans for common software rasterizer strings (llvmpipe/swrast) and driver names."
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info "Good outcome: no llvmpipe/swrast matches. Driver-name matches can vary by stack."
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echo -e "${DIM}\$ sudo grep -Ei 'llvmpipe|swrast|iris|radeonsi|nouveau|zink|nvidia|_dri\\.so' /proc/\$GHOSTTY_PID/maps${RESET}"
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PROBE_LINES="$(sudo grep -Ei 'llvmpipe|swrast|iris|radeonsi|nouveau|zink|nvidia|_dri\.so' "/proc/${GHOSTTY_PID}/maps" || true)"
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if [[ -n "${PROBE_LINES}" ]]; then
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echo "${PROBE_LINES}"
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if echo "${PROBE_LINES}" | grep -Eiq 'llvmpipe|swrast'; then
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software_rasterizer=1
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warn "Software rasterizer markers detected (llvmpipe/swrast)."
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else
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ok "Driver-related markers detected and no software rasterizer markers found."
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fi
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else
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ok "No probe matches found. This is often fine; absence of llvmpipe/swrast is usually good."
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fi
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section "Final interpretation"
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if (( found_process == 1 )); then
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ok "Process check: PASS"
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else
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warn "Process check: no process found initially (script still proceeded once PID was resolved)."
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fi
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if (( found_render_node == 1 )); then
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ok "Render node check: PASS (/dev/dri/renderD* present)"
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else
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warn "Render node check: no explicit renderD node found"
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fi
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if (( found_gpu_libs == 1 )); then
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ok "Graphics library check: PASS"
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else
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warn "Graphics library check: no matches"
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fi
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if (( software_rasterizer == 1 )); then
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warn "Software rasterizer check: POSSIBLE software rendering path"
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else
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ok "Software rasterizer check: no llvmpipe/swrast markers detected"
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fi
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echo
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if (( found_render_node == 1 && found_gpu_libs == 1 && software_rasterizer == 0 )); then
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ok "Overall: strong evidence Ghostty is using GPU acceleration."
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else
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warn "Overall: mixed signals. Consider running a live GPU activity monitor during terminal redraw stress."
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fi
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ok "Summary complete for PID ${GHOSTTY_PID}"
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