Fix dashboard freeze: waitress, reduce frame refresh, atomic reads

- Switch Flask dev server -> waitress (8 threads, production WSGI)
- Only refresh frame.jpg when frame_index changes, not every second
- Safety try/except on send_file for edge-case file conflicts
- Fix test_run.sh: export PYTHONPATH, use venv python
- Update service file to use venv python

chicken-dashboard.service

@@ -6,7 +6,7 @@ After=network.target
 Type=simple
 User=dsutanto
 WorkingDirectory=/media/jetson/DATA/.Codes/chicken-counting-sukawarna-det
-ExecStart=/usr/bin/python3 dashboard.py --port 8080 --db chicken_counts.db
+ExecStart=/media/jetson/DATA/karung-sukawarna/venv/bin/python dashboard.py --port 8080 --db chicken_counts.db
 Restart=always
 RestartSec=5
 Environment=PYTHONUNBUFFERED=1

dashboard.py

@@ -14,7 +14,8 @@ import sqlite3
 import threading
 from pathlib import Path
 
-from flask import Flask, Response, jsonify, render_template, send_file
+from flask import Flask, jsonify, render_template, send_file
+from waitress import serve
 
 # Suppress Flask request logs
 log = logging.getLogger("werkzeug")
@@ -103,7 +104,10 @@ def shm_frame(camera_id):
     frame_path = Path(app.config["shm_dir"]) / f"chicken_counter_{camera_id}" / "frame.jpg"
     if not frame_path.exists():
         return jsonify({"error": "not found"}), 404
-    return send_file(frame_path, mimetype="image/jpeg", max_age=0, download_name=None)
+    try:
+        return send_file(frame_path, mimetype="image/jpeg", max_age=2, download_name=None)
+    except (FileNotFoundError, PermissionError):
+        return jsonify({"error": "not ready"}), 503
 
 
 def _get_db():
@@ -205,7 +209,6 @@ def main():
     parser.add_argument("--poll-ms", type=int, default=500)
     parser.add_argument("--date", default="", help="Processing date")
     parser.add_argument("--db", default="chicken_counts.db", help="SQLite database path")
-    parser.add_argument("--debug", action="store_true")
     args = parser.parse_args()
 
     app.config["shm_dir"] = args.shm_dir
@@ -217,7 +220,7 @@ def main():
         _init_db(app.config["db_path"])
 
     print(f"[dashboard] http://0.0.0.0:{args.port}  shm={args.shm_dir}  db={args.db}" + (f"  date={args.date}" if args.date else ""))
-    app.run(host="0.0.0.0", port=args.port, debug=args.debug, threaded=True)
+    serve(app, host="0.0.0.0", port=args.port, threads=8)
 
 
 if __name__ == "__main__":

templates/index.html

@@ -121,11 +121,10 @@ function selectCam(id) {
 function poll() {
     if (!activeCam) return;
     var t = Date.now();
-    var img = document.getElementById("frame-img");
-    img.src = "/shm/" + activeCam + "/frame.jpg?t=" + t;
     fetch("/shm/" + activeCam + "/stats.json?t=" + t).then(r => r.ok ? r.json() : null).then(s => {
         if (!s) { setOffline(); return; }
         lastUpdate = Date.now();
+        var oldFrame = lastFramePerCam[activeCam] || 0;
         lastFramePerCam[activeCam] = s.frame_index;
         perCam[activeCam] = { total: s.total_entered_count, inside: s.inside_box_count, frame: s.frame_index, tracks: s.track_count, speed: s.smoothed_speed };
         document.getElementById("s-total").textContent = s.total_entered_count;
@@ -138,6 +137,10 @@ function poll() {
         tag.textContent = activeCam + " \u2022 " + status;
         tag.className = "tag " + (s.backward_active ? "off" : "live");
         document.getElementById("cam-count").textContent = s.total_entered_count;
+        // only refresh frame when index changes (every 5 frames with interval_frames=5)
+        if (s.frame_index != oldFrame) {
+            document.getElementById("frame-img").src = "/shm/" + activeCam + "/frame.jpg?t=" + t;
+        }
     });
 }
 

test_run.sh

@@ -1,7 +1,8 @@
 #!/bin/bash
 set -euo pipefail
 
-CMD="PYTHONPATH=/media/jetson/DATA/.Codes/chicken-counting-sukawarna-det/src /media/jetson/DATA/karung-sukawarna/venv/bin/python -m chicken_counter.cli"
+export PYTHONPATH=/media/jetson/DATA/.Codes/chicken-counting-sukawarna-det/src
+PYTHON=/media/jetson/DATA/karung-sukawarna/venv/bin/python
 
 dates=(
     "2026-06-10" "2026-06-11" "2026-06-12" "2026-06-13" "2026-06-14"
@@ -10,5 +11,5 @@ dates=(
 
 for date in "${dates[@]}"; do
     echo "=== Processing $date ==="
-    $CMD batch --config configs/cycle7_batch.yaml --date "$date" --no-video
+    $PYTHON -m chicken_counter.cli batch --config configs/cycle7_batch.yaml --date "$date" --no-video
 done