Create run.py

run.py

@@ -0,0 +1,35 @@
+"""
+Parallel execution test for gr.Workflow.
+
+Open in two browser tabs, type different prompts, click Run in both within
+a second of each other. Check the printed timestamps:
+
+  BEFORE fix: tab 2's slow_fn starts exactly when tab 1's slow_fn ends (~16s total)
+  AFTER fix:  both run concurrently (~8s total), timestamps overlap
+"""
+import time
+from datetime import UTC, datetime
+
+import gradio as gr
+
+
+def _now() -> str:
+    return datetime.now(UTC).strftime("%H:%M:%S.%f")[:-3]
+
+
+def slow_fn(text: str) -> str:
+    start = _now()
+    time.sleep(5)
+    return f"slow | start={start} end={_now()} | input={text!r}"
+
+
+def fast_fn(text: str) -> str:
+    start = _now()
+    time.sleep(2)
+    return f"fast | start={start} end={_now()}\n{text}"
+
+
+demo = gr.Workflow(bind={"slow_fn": slow_fn, "fast_fn": fast_fn})
+
+if __name__ == "__main__":
+    demo.launch()