diff --git a/run_time_test.py b/run_time_test.py
index 3b561f4..3d09dab 100644
--- a/run_time_test.py
+++ b/run_time_test.py
@@ -1,6 +1,8 @@
 import time
 from contextlib import nullcontext
 from typing import Callable
+from collections import defaultdict
+import json
 
 import torch
 import torch.utils._pytree as pytree
@@ -10,6 +12,7 @@
 from torch.utils._mode_utils import no_dispatch
 from torch.utils._python_dispatch import TorchDispatchMode
 from torch.utils.flop_counter import flop_registry
+from torch.utils.module_tracker import ModuleTracker
 
 from fsdp_test import GPT, GPTConfig
 
@@ -78,6 +81,10 @@ def __init__(self):
         }
         self.no_fallback_kernel = set()
         self.total_time: float = 0.0
+        self.mod_tracker = ModuleTracker()
+        self.fwd_runtimes: Dict[str, int] = defaultdict(lambda: 0)
+        self.bwd_runtimes: Dict[str, int] = defaultdict(lambda: 0)
+
     # Adapted from: https://github.com/pytorch/pytorch/blob/main/torch/_subclasses/fake_tensor.py#L1838
     # NB: returns fake tensors
     def _maybe_run_and_benchmark_fallback_kernel(
@@ -176,11 +183,17 @@ def _dispatch_benchmark_estimate(self, func, args, kwargs):
                     )
                 )
                 self.total_time += mean_op_time
+                for par in self.mod_tracker.parents:
+                    if self.mod_tracker.is_bw:
+                        self.bwd_runtimes[par] += mean_op_time
+                    else:
+                        self.fwd_runtimes[par] += mean_op_time
                 return res
             except NotImplementedError:
                 self.no_fallback_kernel.add(func._overloadpacket)
         res = func(*args, **kwargs or {})
         return res
+
     # Adapted from: https://github.com/pytorch/pytorch/blob/main/torch/_inductor/scheduler.py#L563
     def _dispatch_inductor_estimate(self, func, args, kwargs):
         def get_num_bytes(t: torch.Tensor) -> int:
@@ -251,6 +264,11 @@ def get_transfer_time(flat_args_kwargs, flat_outs):
             # compute time. We divide by 1e6 to get the time in ms
             op_time = max(transfer_time, compute_time) / 1e6
             self.total_time += op_time
+            for par in self.mod_tracker.parents:
+                if self.mod_tracker.is_bw:
+                    self.bwd_runtimes[par] += op_time
+                else:
+                    self.fwd_runtimes[par] += op_time
 
         return out
 
@@ -280,6 +298,9 @@ def __enter__(self):
         self.fake_mode = fake_mode
         self.total_time = 0.0
         super().__enter__()
+        self.fwd_runtimes.clear()
+        self.bwd_runtimes.clear()
+        self.mod_tracker.__enter__()
         return self
 
     def __exit__(self, *args):
@@ -289,6 +310,13 @@ def __exit__(self, *args):
         )
         if len(self.no_fallback_kernel) > 0:
             print("no_fallback_kernel: ", list(self.no_fallback_kernel))
+        print(
+            "===== FORWARD RUN TIMES =====\n",
+            json.dumps(dict(self.fwd_runtimes), indent=4),
+            "===== BACKWARD RUN TIMES =====\n",
+            json.dumps(dict(self.bwd_runtimes), indent=4)
+        )
+        self.mod_tracker.__exit__()
         return super().__exit__(*args)