feat: show number of widgets created and close when using --timing

solara/server/patch.py

@@ -264,6 +264,7 @@ def Thread_debug_run(self):
 _patched = False
 global_widgets_dict = {}
 global_templates_dict: Dict[Any, Any] = {}
+widgets = context_dict_widgets()
 
 
 def Output_enter(self):
@@ -314,14 +315,14 @@ def patch():
 
     if ipywidget_version_major < 8:
         global_widgets_dict = ipywidgets.widget.Widget.widgets
-        ipywidgets.widget.Widget.widgets = context_dict_widgets()  # type: ignore
+        ipywidgets.widget.Widget.widgets = widgets  # type: ignore
     else:
         if hasattr(ipywidgets.widgets.widget, "_instances"):  # since 8.0.3
             global_widgets_dict = ipywidgets.widgets.widget._instances
-            ipywidgets.widgets.widget._instances = context_dict_widgets()  # type: ignore
+            ipywidgets.widgets.widget._instances = widgets  # type: ignore
         elif hasattr(ipywidgets.widget.Widget, "_instances"):
             global_widgets_dict = ipywidgets.widget.Widget._instances
-            ipywidgets.widget.Widget._instances = context_dict_widgets()  # type: ignore
+            ipywidgets.widget.Widget._instances = widgets  # type: ignore
         else:
             raise RuntimeError("Could not find _instances on ipywidgets version %r" % ipywidgets.__version__)
     threading.Thread.__init__ = WidgetContextAwareThread__init__  # type: ignore

solara/server/server.py

@@ -16,7 +16,7 @@
 import solara
 import solara.routing
 
-from . import app, jupytertools, settings, websocket
+from . import app, jupytertools, patch, settings, websocket
 from .kernel import Kernel, deserialize_binary_message
 from .kernel_context import initialize_virtual_kernel
 
@@ -135,6 +135,8 @@ async def app_loop(ws: websocket.WebsocketWrapper, session_id: str, kernel_id: s
                 solara_user.set(user)
 
             while True:
+                if settings.main.timing:
+                    widgets_ids = set(patch.widgets)
                 try:
                     message = await ws.receive()
                 except websocket.WebSocketDisconnect:
@@ -156,7 +158,13 @@ async def app_loop(ws: websocket.WebsocketWrapper, session_id: str, kernel_id: s
                     return
                 t2 = time.time()
                 if settings.main.timing:
-                    print(f"timing: total={t2-t0:.3f}s, deserialize={t1-t0:.3f}s, kernel={t2-t1:.3f}s")  # noqa: T201
+                    widgets_ids_after = set(patch.widgets)
+                    created_widgets_count = len(widgets_ids_after - widgets_ids)
+                    close_widgets_count = len(widgets_ids - widgets_ids_after)
+                    print(  # noqa: T201
+                        f"timing: total={t2-t0:.3f}s, deserialize={t1-t0:.3f}s, kernel={t2-t1:.3f}s"
+                        f" widget: created: {created_widgets_count} closed: {close_widgets_count}"
+                    )
     finally:
         context.page_disconnect(page_id)