[Gemini] rename hooks related to runtime mem tracer
diff --git a/colossalai/gemini/memory_tracer/runtime_mem_tracer.py b/colossalai/gemini/memory_tracer/runtime_mem_tracer.py
index 829e0d4d42b1..ead95535e5a9 100644
--- a/colossalai/gemini/memory_tracer/runtime_mem_tracer.py
+++ b/colossalai/gemini/memory_tracer/runtime_mem_tracer.py
@@ -1,7 +1,7 @@
 import torch.nn
 
 from colossalai.gemini.memory_tracer.model_data_memtracer import GLOBAL_CUDA_MEM_INFO
-from colossalai.gemini.ophooks.param_trace_hook import GradHook, ParamTracerHook
+from colossalai.gemini.ophooks.runtime_mem_tracer_hook import GradMemTracerHook, ParamMemTracerHook
 from colossalai.nn.parallel.data_parallel import _cast_float
 from colossalai.tensor.param_op_hook import ParamOpHookManager
 
@@ -14,8 +14,8 @@ def __init__(self, module: torch.nn.Module, dtype: torch.dtype = torch.half):
         super().__init__()
         self.module = module
         self.dtype = dtype
-        self.param_op_hook = ParamTracerHook()
-        self.grad_hook = GradHook(module)
+        self.param_op_hook = ParamMemTracerHook()
+        self.grad_hook = GradMemTracerHook(module)
         self.cpu_param_data_dict = {}
 
         for p in module.parameters():
diff --git a/colossalai/gemini/ophooks/_shard_grad_ophook.py b/colossalai/gemini/ophooks/_shard_grad_ophook.py
index 582f95802a71..5115ff74da16 100644
--- a/colossalai/gemini/ophooks/_shard_grad_ophook.py
+++ b/colossalai/gemini/ophooks/_shard_grad_ophook.py
@@ -1,11 +1,12 @@
 import torch
+
 from colossalai.registry import OPHOOKS
 
 from . import BaseOpHook
 
 
 @OPHOOKS.register_module
-class ShardGradHook(BaseOpHook):
+class ShardGradMemTracerHook(BaseOpHook):
     """
     A hook to process sharded param before and afther FWD and BWD operator executing.
     """
diff --git a/colossalai/gemini/ophooks/mem_trace_hook.py b/colossalai/gemini/ophooks/mem_trace_hook.py
deleted file mode 100644
index 6976552591db..000000000000
--- a/colossalai/gemini/ophooks/mem_trace_hook.py
+++ /dev/null
@@ -1,100 +0,0 @@
-import torch
-
-from colossalai.gemini.memory_tracer import SyncCudaMemoryMonitor
-from colossalai.gemini.ophooks import BaseOpHook
-
-
-class MemTracerOpHook(BaseOpHook):
-    """
-    TODO() what if parameters are sharded by multiple submodules.
-    register buff on its father node
-    """
-
-    def __init__(self):
-        super().__init__()
-        self.mem_monitor = SyncCudaMemoryMonitor()
-        self._cur_non_model_data_vol = 0
-        self._non_model_data_list = []
-        self._cur_model_data_vol = 0
-
-    def _move_module_to_dev(self, module, dev: str) -> int:
-        """
-        move module to target dev
-        Args:
-            module (torch.nn.Module): a PyTorch module
-            dev (torch.device): the target device
-        Returns:
-            int: the data volume of this module on the cuda
-        """
-        assert isinstance(dev, str), f"device should be a str not torch.device"
-        comm_volume = 0
-        for p in module.parameters():
-            if p.data.device.type != dev:
-                p.data = p.data.to(dev)
-                comm_volume += p.data.numel() * p.data.element_size()
-            if p.grad is not None:
-                if p.grad.device.type != dev:
-                    p.grad = p.grad.to(dev)
-                    comm_volume += p.grad.numel() * p.grad.element_size()
-
-        for buf in module.buffers():
-            if buf.device.type != dev:
-                buf.data = buf.data.to(dev)
-                comm_volume += buf.data.numel() * buf.data.element_size()
-
-        if dev == 'cuda':
-            self._cur_model_data_vol = comm_volume
-
-        return comm_volume
-
-    def pre_fwd_exec(self, module: torch.nn.Module, *args):
-        if module.training:
-            cuda_volume = self.mem_monitor.finish()
-            comm_volume = self._move_module_to_dev(module, 'cuda')
-            self.mem_monitor.start()
-            # print(f'FWD PRE {module.__class__.__name__} cuda used {(cuda_volume) / 1e6} MB')
-
-    def post_fwd_exec(self, module: torch.nn.Module, *args):
-        if module.training:
-            cuda_volume = self.mem_monitor.finish()
-            comm_volume = self._move_module_to_dev(module, 'cpu')
-            self._non_model_data_list.append(cuda_volume - comm_volume)
-            # print(f'FWD POST {module.__class__.__name__} cuda used {(cuda_volume) / 1e6} MB, non-model data used {(cuda_volume - comm_volume) / 1e6} MB')
-
-    def pre_bwd_exec(self, module: torch.nn.Module, input, output):
-        assert isinstance(module, torch.nn.Module)
-        if module.training:
-            cuda_volume = self.mem_monitor.finish()
-            self._move_module_to_dev(module, 'cuda')
-            self.mem_monitor.start()
-            # print(f'BWD PRE {module.__class__.__name__}')
-
-    def post_bwd_exec(self, module: torch.nn.Module, input):
-        # bwd Op will generate grad. comm_volume is grad + data volume on cuda.
-        assert isinstance(module, torch.nn.Module)
-        if module.training:
-            cuda_volume = self.mem_monitor.finish()
-            comm_volume = self._move_module_to_dev(module, 'cpu')
-            self._non_model_data_list.append(cuda_volume - comm_volume)
-            # print(f'BWD POST {module.__class__.__name__} {cuda_volume / 1e6} MB, non-model data used {(cuda_volume - comm_volume) / 1e6} MB')
-
-    def pre_iter(self):
-        pass
-
-    def post_iter(self):
-        self.mem_monitor.finish()
-        # print(f'post_iter')
-
-    def print_non_model_data(self):
-        print(self._non_model_data_list)
-
-    def save_results(self, filename):
-        self.mem_monitor.save(filename)
-
-    def show_mem_stats(self):
-        start_timestamp = min(self.mem_monitor.time_stamps)
-        self.mem_monitor.time_stamps = [elem - start_timestamp for elem in self.mem_monitor.time_stamps]
-        min_mem_used = min(self.mem_monitor.mem_stats)
-        self.mem_monitor.mem_stats = [elem - min_mem_used for elem in self.mem_monitor.mem_stats]
-        print(self.mem_monitor.time_stamps)
-        print(self.mem_monitor.mem_stats)
diff --git a/colossalai/gemini/ophooks/param_trace_hook.py b/colossalai/gemini/ophooks/runtime_mem_tracer_hook.py
similarity index 93%
rename from colossalai/gemini/ophooks/param_trace_hook.py
rename to colossalai/gemini/ophooks/runtime_mem_tracer_hook.py
index 678927d78660..5f155f085647 100644
--- a/colossalai/gemini/ophooks/param_trace_hook.py
+++ b/colossalai/gemini/ophooks/runtime_mem_tracer_hook.py
@@ -6,9 +6,9 @@
 import torch
 
 from colossalai.gemini.memory_tracer import SyncCudaMemoryMonitor
-from colossalai.tensor.param_op_hook import ParamOpHook
-from colossalai.gemini.tensor_utils import free_storage, alloc_storage
 from colossalai.gemini.memory_tracer.model_data_memtracer import GLOBAL_CUDA_MEM_INFO
+from colossalai.gemini.tensor_utils import alloc_storage, free_storage
+from colossalai.tensor.param_op_hook import ParamOpHook
 
 
 class TrainingPhase(Enum):
@@ -16,7 +16,8 @@ class TrainingPhase(Enum):
     BACKWARD = 1
 
 
-class GradHook():
+class GradMemTracerHook():
+
     def __init__(self, module: torch.nn.Module):
         self.module = module
         self.grad_hook_list = []
@@ -38,7 +39,7 @@ def remove_grad_hook(self):
             hook.remove()
 
 
-class ParamTracerHook(ParamOpHook):
+class ParamMemTracerHook(ParamOpHook):
 
     def __init__(self) -> None:
         super().__init__()
@@ -57,7 +58,9 @@ def _allocate_params_on_cuda(self, params):
             if cur_dev == "cpu":
                 if p.grad is not None and p.grad.device.type == "cpu":
                     raise NotImplementedError("Only run in forward propagation")
-                p.data = torch.empty(p.data.shape, device="cuda", dtype=p.data.dtype,
+                p.data = torch.empty(p.data.shape,
+                                     device="cuda",
+                                     dtype=p.data.dtype,
                                      requires_grad=p.data.requires_grad)
             elif cur_dev == "cuda":
                 alloc_storage(p.data)
diff --git a/tests/test_gemini/test_runtime_mem_tracer.py b/tests/test_gemini/test_runtime_mem_tracer.py
index 47f6e432b19c..2806b8cb0e3b 100644
--- a/tests/test_gemini/test_runtime_mem_tracer.py
+++ b/tests/test_gemini/test_runtime_mem_tracer.py
@@ -29,7 +29,7 @@ def test_runtime_mem_tracer():
         model_builder, train_dataloader, _, _, criterion = get_components_func()
 
         with ColoInitContext(device=torch.device('cpu')):
-            model = model_builder(checkpoint=True)
+            model = model_builder(checkpoint=False)
 
         model_bk = deepcopy(model)
         runtime_mem_tracer = RuntimeMemTracer(model)
@@ -47,7 +47,7 @@ def test_runtime_mem_tracer():
 
         cuda_non_model_data_list = np.array(GLOBAL_CUDA_MEM_INFO.non_model_data_list) / 1024**2
         print("cuda_non_model_data_list", len(cuda_non_model_data_list))
-        # print(GLOBAL_CUDA_MEM_INFO.non_model_data_list)
+        print(GLOBAL_CUDA_MEM_INFO.non_model_data_list)
 
         del model
 
