Change the position of start_time in test_performance_ema_threadsafe

tests/test_util_modules.py

@@ -568,7 +568,6 @@ def run_task(ema, start_event, task_size):
     with ThreadPoolExecutor(max_workers) as pool:
         ema = PerformanceEMA(alpha=alpha)
         start_event = Event()
-        start_time = time.perf_counter()
 
         futures = []
         for _ in range(num_updates):
@@ -578,6 +577,7 @@ def run_task(ema, start_event, task_size):
 
         ema.reset_timer()
         start_event.set()
+        start_time = time.perf_counter()
         total_size = sum(future.result() for future in as_completed(futures))
         end_time = time.perf_counter()
         target = total_size / (end_time - start_time)