remove torch.cuda.event time calculator

fbgemm_gpu/bench/bench_utils.py

@@ -40,25 +40,11 @@ def warmup(
 ) -> None:
     indices, offsets, weights = request.unpack_3()
     if warmup_ms:
-        if torch.cuda.is_available():
-            elapsed_time_ms = 0
-            torch.cuda.synchronize()
-            start_events = torch.cuda.Event(enable_timing=True)
-            end_events = torch.cuda.Event(enable_timing=True)
-            while elapsed_time_ms < warmup_ms:
-                start_events.record()
-                out = func(indices, offsets, weights)
-                if bwd_only:
-                    out.backward(grad)
-                end_events.record()
-                torch.cuda.synchronize()
-                elapsed_time_ms += start_events.elapsed_time(end_events)
-        else:
-            start_time_ms = time.time() * 1000
-            while time.time() * 1000 - start_time_ms < warmup_ms:
-                out = func(indices, offsets, weights)
-                if bwd_only:
-                    out.backward(grad)
+        start_time_ms = time.time() * 1000
+        while time.time() * 1000 - start_time_ms < warmup_ms:
+            out = func(indices, offsets, weights)
+            if bwd_only:
+                out.backward(grad)
     else:
         for _ in range(warmup_runs):
             out = func(indices, offsets, weights)