Update app.py

app.py

@@ -9,7 +9,44 @@ import pandas as pd
 from datetime import datetime
 from typing import Dict, Any, List, Optional
 import threading
-import psutil  # added for memory monitoring
+
+# ----------------------------------------------------------------------
+# Memory monitoring (no external dependencies)
+# ----------------------------------------------------------------------
+def get_memory_usage():
+    """Return current process memory usage in MB (RSS)."""
+    try:
+        # Try using resource module (Unix-like)
+        import resource
+        rss = resource.getrusage(resource.RUSAGE_SELF).ru_maxrss
+        # On Linux, ru_maxrss is in kilobytes; on macOS, in bytes
+        if rss < 1e9:   # likely kilobytes
+            return rss / 1024.0   # convert to MB
+        else:
+            return rss / (1024.0 * 1024.0)   # convert to MB
+    except ImportError:
+        # Fallback to reading /proc/self/status (Linux)
+        try:
+            with open("/proc/self/status") as f:
+                for line in f:
+                    if line.startswith("VmRSS:"):
+                        parts = line.split()
+                        if len(parts) >= 2:
+                            # Value in kB
+                            return int(parts[1]) / 1024.0   # convert to MB
+        except Exception:
+            pass
+    return None
+
+def log_memory_usage():
+    """Periodically log memory usage to help diagnose timeouts."""
+    mem_mb = get_memory_usage()
+    if mem_mb is not None:
+        logging.info(f"Process memory: {mem_mb:.1f} MB")
+    else:
+        logging.info("Process memory: unknown")
+    # Schedule next check in 60 seconds
+    threading.Timer(60, log_memory_usage).start()
 
 # ----------------------------------------------------------------------
 # Plotly for dashboards
@@ -362,23 +399,8 @@ def refresh_dashboard():
     )
 
 # ----------------------------------------------------------------------
-# Memory monitoring (added for debugging)
+# Start memory monitoring (non‑blocking)
 # ----------------------------------------------------------------------
-def log_memory_usage():
-    """Periodically log memory usage to help diagnose timeouts."""
-    try:
-        process = psutil.Process(os.getpid())
-        mem_info = process.memory_info()
-        logger.info(f"Memory usage: RSS={mem_info.rss / 1e6:.1f} MB, VMS={mem_info.vms / 1e6:.1f} MB")
-        # Also log system memory if available
-        sys_mem = psutil.virtual_memory()
-        logger.info(f"System memory: {sys_mem.percent}% used, {sys_mem.available / 1e9:.1f} GB free")
-    except Exception as e:
-        logger.error(f"Failed to log memory: {e}")
-    # Schedule next check in 60 seconds
-    threading.Timer(60, log_memory_usage).start()
-
-# Start memory logging (once)
 log_memory_usage()
 
 # ----------------------------------------------------------------------