Refactor and improve model_management code related to free memory.

comfy/model_management.py

 import psutil
 from enum import Enum
 from comfy.cli_args import args
+import torch
 
 class VRAMState(Enum):
     CPU = 0
@@ -33,28 +34,67 @@ if args.directml is not None:
     lowvram_available = False #TODO: need to find a way to get free memory in directml before this can be enabled by default.
 
 try:
-    import torch
-    if directml_enabled:
-        pass #TODO
-    else:
-        try:
-            import intel_extension_for_pytorch as ipex
-            if torch.xpu.is_available():
-                xpu_available = True
-                total_vram = torch.xpu.get_device_properties(torch.xpu.current_device()).total_memory / (1024 * 1024)
-        except:
-            total_vram = torch.cuda.mem_get_info(torch.cuda.current_device())[1] / (1024 * 1024)
-    total_ram = psutil.virtual_memory().total / (1024 * 1024)
-    if not args.normalvram and not args.cpu:
-        if lowvram_available and total_vram <= 4096:
-            print("Trying to enable lowvram mode because your GPU seems to have 4GB or less. If you don't want this use: --normalvram")
-            set_vram_to = VRAMState.LOW_VRAM
-        elif total_vram > total_ram * 1.1 and total_vram > 14336:
-            print("Enabling highvram mode because your GPU has more vram than your computer has ram. If you don't want this use: --normalvram")
-            vram_state = VRAMState.HIGH_VRAM
+    import intel_extension_for_pytorch as ipex
+    if torch.xpu.is_available():
+        xpu_available = True
 except:
     pass
 
+def get_torch_device():
+    global xpu_available
+    global directml_enabled
+    if directml_enabled:
+        global directml_device
+        return directml_device
+    if vram_state == VRAMState.MPS:
+        return torch.device("mps")
+    if vram_state == VRAMState.CPU:
+        return torch.device("cpu")
+    else:
+        if xpu_available:
+            return torch.device("xpu")
+        else:
+            return torch.device(torch.cuda.current_device())
+
+def get_total_memory(dev=None, torch_total_too=False):
+    global xpu_available
+    global directml_enabled
+    if dev is None:
+        dev = get_torch_device()
+
+    if hasattr(dev, 'type') and (dev.type == 'cpu' or dev.type == 'mps'):
+        mem_total = psutil.virtual_memory().total
+        mem_total_torch = mem_total
+    else:
+        if directml_enabled:
+            mem_total = 1024 * 1024 * 1024 #TODO
+            mem_total_torch = mem_total
+        elif xpu_available:
+            mem_total = torch.xpu.get_device_properties(dev).total_memory
+            mem_total_torch = mem_total
+        else:
+            stats = torch.cuda.memory_stats(dev)
+            mem_reserved = stats['reserved_bytes.all.current']
+            _, mem_total_cuda = torch.cuda.mem_get_info(dev)
+            mem_total_torch = mem_reserved
+            mem_total = mem_total_cuda
+
+    if torch_total_too:
+        return (mem_total, mem_total_torch)
+    else:
+        return mem_total
+
+total_vram = get_total_memory(get_torch_device()) / (1024 * 1024)
+total_ram = psutil.virtual_memory().total / (1024 * 1024)
+print("Total VRAM {:0.0f} MB, total RAM {:0.0f} MB".format(total_vram, total_ram))
+if not args.normalvram and not args.cpu:
+    if lowvram_available and total_vram <= 4096:
+        print("Trying to enable lowvram mode because your GPU seems to have 4GB or less. If you don't want this use: --normalvram")
+        set_vram_to = VRAMState.LOW_VRAM
+    elif total_vram > total_ram * 1.1 and total_vram > 14336:
+        print("Enabling highvram mode because your GPU has more vram than your computer has ram. If you don't want this use: --normalvram")
+        vram_state = VRAMState.HIGH_VRAM
+
 try:
     OOM_EXCEPTION = torch.cuda.OutOfMemoryError
 except:
@@ -128,29 +168,17 @@ if args.cpu:
 
 print(f"Set vram state to: {vram_state.name}")
 
-def get_torch_device():
-    global xpu_available
-    global directml_enabled
-    if directml_enabled:
-        global directml_device
-        return directml_device
-    if vram_state == VRAMState.MPS:
-        return torch.device("mps")
-    if vram_state == VRAMState.CPU:
-        return torch.device("cpu")
-    else:
-        if xpu_available:
-            return torch.device("xpu")
-        else:
-            return torch.cuda.current_device()
-
 def get_torch_device_name(device):
     if hasattr(device, 'type'):
-        return "{}".format(device.type)
-    return "CUDA {}: {}".format(device, torch.cuda.get_device_name(device))
+        if device.type == "cuda":
+            return "{} {}".format(device, torch.cuda.get_device_name(device))
+        else:
+            return "{}".format(device.type)
+    else:
+        return "CUDA {}: {}".format(device, torch.cuda.get_device_name(device))
 
 try:
-    print("Using device:", get_torch_device_name(get_torch_device()))
+    print("Device:", get_torch_device_name(get_torch_device()))
 except:
     print("Could not pick default device.")
 
@@ -308,33 +336,6 @@ def pytorch_attention_flash_attention():
             return True
     return False
 
-def get_total_memory(dev=None, torch_total_too=False):
-    global xpu_available
-    global directml_enabled
-    if dev is None:
-        dev = get_torch_device()
-
-    if hasattr(dev, 'type') and (dev.type == 'cpu' or dev.type == 'mps'):
-        mem_total = psutil.virtual_memory().total
-    else:
-        if directml_enabled:
-            mem_total = 1024 * 1024 * 1024 #TODO
-            mem_total_torch = mem_total
-        elif xpu_available:
-            mem_total = torch.xpu.get_device_properties(dev).total_memory
-            mem_total_torch = mem_total
-        else:
-            stats = torch.cuda.memory_stats(dev)
-            mem_reserved = stats['reserved_bytes.all.current']
-            _, mem_total_cuda = torch.cuda.mem_get_info(dev)
-            mem_total_torch = mem_reserved
-            mem_total = mem_total_cuda
-
-    if torch_total_too:
-        return (mem_total, mem_total_torch)
-    else:
-        return mem_total
-
 def get_free_memory(dev=None, torch_free_too=False):
     global xpu_available
     global directml_enabled

server.py

@@ -7,7 +7,6 @@ import execution
 import uuid
 import json
 import glob
-import torch
 from PIL import Image
 from io import BytesIO
 
@@ -284,9 +283,8 @@ class PromptServer():
 
         @routes.get("/system_stats")
         async def get_queue(request):
-            device_index = comfy.model_management.get_torch_device()
-            device = torch.device(device_index)
-            device_name = comfy.model_management.get_torch_device_name(device_index)
+            device = comfy.model_management.get_torch_device()
+            device_name = comfy.model_management.get_torch_device_name(device)
             vram_total, torch_vram_total = comfy.model_management.get_total_memory(device, torch_total_too=True)
             vram_free, torch_vram_free = comfy.model_management.get_free_memory(device, torch_free_too=True)
             system_stats = {