[zero] fix init device bug in zero init context unittest (#516)

colossalai/utils/memory_tracer/async_memtracer.py

@@ -2,26 +2,10 @@ from concurrent.futures import ThreadPoolExecutor
 from time import sleep, time
 import pickle
 
-from colossalai.utils import get_current_device
 import torch
 
-
-def get_cuda_memory_used(device: torch.device) -> int:
-    """
-    Get the free memory info of device.
-    :param device: device id
-    :type device: torch.device
-    :return: current memory usage, sized by MB
-    :rtype: int
-    """
-
-    assert device.type == 'cuda'
-
-    ret: int = torch.cuda.memory_allocated(device)
-    # get the peak memory to report correct data, so reset the counter for the next call
-    if hasattr(torch.cuda, "reset_peak_memory_stats"):    # pytorch 1.4+
-        torch.cuda.reset_peak_memory_stats(device)
-    return ret
+from colossalai.utils import get_current_device
+from colossalai.utils.memory_utils.memory_monitor import colo_cuda_memory_used
 
 
 class AsyncMemoryMonitor:
@@ -97,7 +81,7 @@ class AsyncMemoryMonitor:
         while self.keep_measuring:
             max_usage = max(
                 max_usage,
-                get_cuda_memory_used(torch.device(f'cuda:{get_current_device()}')),
+                colo_cuda_memory_used(),
             )
             sleep(self.interval)
         return max_usage

colossalai/utils/memory_tracer/memstats_collector.py

@@ -1,5 +1,5 @@
 from colossalai.utils.memory_tracer.model_data_memtracer import GLOBAL_MODEL_DATA_TRACER
-from .async_memtracer import get_cuda_memory_used
+from colossalai.utils.memory_utils.memory_monitor import colo_cuda_memory_used
 from colossalai.utils import get_current_device
 
 import torch
@@ -55,7 +55,7 @@ class MemStatsCollector:
             sampling_cnt = self._sampling_cnter.sampling_cnt
             assert sampling_cnt == len(self._overall_cuda)
             self._model_data_cuda.append(GLOBAL_MODEL_DATA_TRACER.cuda_usage)
-            self._overall_cuda.append(get_cuda_memory_used(torch.device(f'cuda:{get_current_device()}')))
+            self._overall_cuda.append(colo_cuda_memory_used(torch.device(f'cuda:{get_current_device()}')))
         self._sampling_cnter.advance()
 
     def fetch_memstats(self) -> (int, int):

colossalai/utils/memory_tracer/model_data_memtracer.py

@@ -44,6 +44,9 @@ class ModelDataTracer(metaclass=SingletonMeta):
         mem_use = _col_tensor_mem_usage(t)
         self._cuda_usage -= mem_use
 
+    def clear(self) -> None:
+        self._cuda_usage = 0
+
     @property
     def cpu_usage(self):
         return self._cpu_usage

colossalai/utils/memory_utils/memory_monitor.py

@@ -9,6 +9,28 @@ import torch
 from colossalai.context.parallel_mode import ParallelMode
 from colossalai.core import global_context as gpc
 from colossalai.logging import get_dist_logger
+from colossalai.utils.cuda import get_current_device
+from typing import Optional
+
+
+def colo_cuda_memory_used(device: Optional[torch.device] = None) -> int:
+    """
+    Get the free memory info of device.
+    :param device: a torch device instance or None
+    :type device: Optional[torch.device]
+    :return: current memory usage, sized by Byte
+    :rtype: int
+    """
+    if device:
+        assert device.type == 'cuda'
+    else:
+        device = torch.device(f'cuda:{get_current_device()}')
+
+    ret: int = torch.cuda.memory_allocated(device)
+    # get the peak memory to report correct data, so reset the counter for the next call
+    if hasattr(torch.cuda, "reset_peak_memory_stats"):    # pytorch 1.4+
+        torch.cuda.reset_peak_memory_stats(device)
+    return ret
 
 
 def bytes_to_GB(val, decimal=2):

colossalai/utils/memory_utils/utils.py

@@ -3,7 +3,7 @@ from colossalai.utils import get_current_device
 from colossalai.zero.sharded_param.sharded_tensor import ShardedTensor
 from colossalai.utils.memory_tracer.model_data_memtracer import GLOBAL_MODEL_DATA_TRACER
 
-from typing import Union
+from typing import Union, Optional
 
 _GLOBAL_CUDA_MEM_FRACTION = 1.0
 

colossalai/zero/init_ctx/init_context.py

@@ -6,16 +6,14 @@ from colossalai.context.parallel_mode import ParallelMode
 from colossalai.core import global_context as gpc
 from colossalai.utils.memory_tracer.model_data_memtracer import \
     GLOBAL_MODEL_DATA_TRACER
+from colossalai.utils.memory_utils.memory_monitor import colo_cuda_memory_used
 from colossalai.zero.shard_utils import BaseShardStrategy
 from colossalai.zero.sharded_model._zero3_utils import cast_tensor_to_fp16
 from colossalai.zero.sharded_param import ShardedParamV2
 from torch.distributed import ProcessGroup
 from colossalai.logging import get_dist_logger, disable_existing_loggers
 
-# Inserts _post_init_method at the end of init method
 
-
-# for all sub classes of torch.nn.Module
 class InsertPostInitMethodToModuleSubClasses(object):
 
     def __init__(self):
@@ -144,8 +142,11 @@ class ZeroInitContext(InsertPostInitMethodToModuleSubClasses):
 
             del self.initialized_param_list
         GLOBAL_MODEL_DATA_TRACER.close()
-        cuda_mem_MB = GLOBAL_MODEL_DATA_TRACER.cuda_usage / 1e6
-        self.logger.info(f"Existing ZeRO Context Model Data CUDA Memory Usage {cuda_mem_MB} MB", [0])
+        model_data_cuda_mem_MB = GLOBAL_MODEL_DATA_TRACER.cuda_usage / 1e6
+        self.logger.info(f"Existing ZeRO Context: Model Data CUDA Memory {model_data_cuda_mem_MB} MB", ranks=[0])
+        sys_cuda_mem_MB = colo_cuda_memory_used() / 1e6
+        self.logger.info(f"System CUDA Memory Usage {sys_cuda_mem_MB} MB", ranks=[0])
+        self.logger.info(f"Model Number Parameter {self.model_numel_tensor.numpy()[0]/1e6} M", ranks=[0])
 
     def _post_init_method(self, module: torch.nn.Module):
         """
@@ -178,8 +179,8 @@ class ZeroInitContext(InsertPostInitMethodToModuleSubClasses):
 
             if self.shard_param:
                 self.shard_strategy.shard([param.col_attr.sharded_data_tensor], self.dp_process_group)
-                if param.col_attr.sharded_data_tensor.device.type == 'cuda':
-                    GLOBAL_MODEL_DATA_TRACER.add_tensor(param.col_attr.sharded_data_tensor.payload)
+            if param.col_attr.sharded_data_tensor.device.type == 'cuda':
+                GLOBAL_MODEL_DATA_TRACER.add_tensor(param.col_attr.sharded_data_tensor.payload)
             # if param.col_attr.grad and self.shard_grad:
             #     self.shard_strategy.shard([param.col_attr._grad_sharded_tensor], self.dp_process_group)
             #     GLOBAL_MODEL_DATA_TRACER.add_tensor(param.col_attr._grad_sharded_tensor.payload)

colossalai/zero/shard_utils/tensor_shard_strategy.py

@@ -23,6 +23,9 @@ class TensorShardStrategy(BaseShardStrategy):
     def _shard_tensor(self, t: ShardedTensor, process_group: Optional[dist.ProcessGroup] = None):
         if t.is_sharded:
             return
+        if t.payload.device.type == 'cuda':
+            assert t.payload.device.index == get_current_device(), f"shard tensor on cuda device index {t.payload.device.index},"\
+                f" but current cuda device is {get_current_device()}"
         sharded_payload, _ = get_shard(t.payload, dist.get_rank(process_group), dist.get_world_size(process_group))
         t.reset_payload(sharded_payload)
         t.is_sharded = True