diff --git a/gradio_ui.py b/gradio_ui.py
index 523639b..9d3e37f 100644
--- a/gradio_ui.py
+++ b/gradio_ui.py
@@ -100,15 +100,27 @@ def run_eval(
 def stop_eval():
     global current_process, should_stop
     should_stop = True
-    if current_process and current_process.poll() is None:
-        try:
-            os.killpg(os.getpgid(current_process.pid), signal.SIGKILL)
-        except Exception as e:
-            return f"[Error stopping process group] {e}\n"
-        finally:
+
+    killed_pids = []
+
+    try:
+        for proc in psutil.process_iter(["pid", "name", "cmdline"]):
+            try:
+                cmdline = " ".join(proc.info["cmdline"])
+                if "evalscope" in cmdline and "perf" in cmdline:
+                    killed_pids.append(proc.pid)
+                    proc.kill()
+            except (psutil.NoSuchProcess, psutil.AccessDenied):
+                continue
+
+        if killed_pids:
             current_process = None
-        return "[Force stopped entire process group]\n"
-    return "[No active process]\n"
+            return f"[Force killed evalscope processes: {killed_pids}]\n"
+        else:
+            return "[No evalscope process found]\n"
+
+    except Exception as e:
+        return f"[Error in stop_eval()] {e}\n"