Some fixes to generalize CUDA specific functionality to Intel or other GPUs.

comfy/ldm/modules/attention.py

@@ -323,8 +323,7 @@ class CrossAttentionDoggettx(nn.Module):
                 break
             except model_management.OOM_EXCEPTION as e:
                 if first_op_done == False:
-                    torch.cuda.empty_cache()
-                    torch.cuda.ipc_collect()
+                    model_management.soft_empty_cache()
                     if cleared_cache == False:
                         cleared_cache = True
                         print("out of memory error, emptying cache and trying again")

comfy/ldm/modules/diffusionmodules/util.py

@@ -15,6 +15,7 @@ import torch.nn as nn
 import numpy as np
 from einops import repeat
 
+from comfy import model_management
 from comfy.ldm.util import instantiate_from_config
 import comfy.ops
 
@@ -139,6 +140,7 @@ class CheckpointFunction(torch.autograd.Function):
     @staticmethod
     def backward(ctx, *output_grads):
         ctx.input_tensors = [x.detach().requires_grad_(True) for x in ctx.input_tensors]
+        if model_management.is_nvidia():
             with torch.enable_grad(), \
                     torch.cuda.amp.autocast(**ctx.gpu_autocast_kwargs):
                 # Fixes a bug where the first op in run_function modifies the
@@ -146,6 +148,14 @@ class CheckpointFunction(torch.autograd.Function):
                 # Tensors.
                 shallow_copies = [x.view_as(x) for x in ctx.input_tensors]
                 output_tensors = ctx.run_function(*shallow_copies)
+        elif model_management.is_intel_xpu():
+            with torch.enable_grad(), \
+                    torch.xpu.amp.autocast(**ctx.gpu_autocast_kwargs):
+                # Fixes a bug where the first op in run_function modifies the
+                # Tensor storage in place, which is not allowed for detach()'d
+                # Tensors.
+                shallow_copies = [x.view_as(x) for x in ctx.input_tensors]
+                output_tensors = ctx.run_function(*shallow_copies)
         input_grads = torch.autograd.grad(
             output_tensors,
             ctx.input_tensors + ctx.input_params,

comfy/model_management.py

@@ -58,8 +58,15 @@ except:
 if args.cpu:
     cpu_state = CPUState.CPU
 
-def get_torch_device():
+def is_intel_xpu():
+    global cpu_state
     global xpu_available
+    if cpu_state == CPUState.GPU:
+        if xpu_available:
+            return True
+    return False
+
+def get_torch_device():
     global directml_enabled
     global cpu_state
     if directml_enabled:
@@ -70,13 +77,12 @@ def get_torch_device():
     if cpu_state == CPUState.CPU:
         return torch.device("cpu")
     else:
-        if xpu_available:
+        if is_intel_xpu():
             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()
@@ -88,7 +94,7 @@ def get_total_memory(dev=None, torch_total_too=False):
         if directml_enabled:
             mem_total = 1024 * 1024 * 1024 #TODO
             mem_total_torch = mem_total
-        elif xpu_available:
+        elif is_intel_xpu():
             stats = torch.xpu.memory_stats(dev)
             mem_reserved = stats['reserved_bytes.all.current']
             mem_total = torch.xpu.get_device_properties(dev).total_memory
@@ -146,11 +152,11 @@ def is_nvidia():
     if cpu_state == CPUState.GPU:
         if torch.version.cuda:
             return True
+    return False
 
 ENABLE_PYTORCH_ATTENTION = args.use_pytorch_cross_attention
 VAE_DTYPE = torch.float32
 
-
 try:
     if is_nvidia():
         torch_version = torch.version.__version__
@@ -162,6 +168,9 @@ try:
 except:
     pass
 
+if is_intel_xpu():
+    VAE_DTYPE = torch.bfloat16
+
 if args.fp16_vae:
     VAE_DTYPE = torch.float16
 elif args.bf16_vae:
@@ -220,7 +229,6 @@ if DISABLE_SMART_MEMORY:
     print("Disabling smart memory management")
 
 def get_torch_device_name(device):
-    global xpu_available
     if hasattr(device, 'type'):
         if device.type == "cuda":
             try:
@@ -230,7 +238,7 @@ def get_torch_device_name(device):
             return "{} {} : {}".format(device, torch.cuda.get_device_name(device), allocator_backend)
         else:
             return "{}".format(device.type)
-    elif xpu_available:
+    elif is_intel_xpu():
         return "{} {}".format(device, torch.xpu.get_device_name(device))
     else:
         return "CUDA {}: {}".format(device, torch.cuda.get_device_name(device))
@@ -260,7 +268,6 @@ class LoadedModel:
             return self.model_memory()
 
     def model_load(self, lowvram_model_memory=0):
-        global xpu_available
         patch_model_to = None
         if lowvram_model_memory == 0:
             patch_model_to = self.device
@@ -281,7 +288,7 @@ class LoadedModel:
             accelerate.dispatch_model(self.real_model, device_map=device_map, main_device=self.device)
             self.model_accelerated = True
 
-        if xpu_available and not args.disable_ipex_optimize:
+        if is_intel_xpu() and not args.disable_ipex_optimize:
             self.real_model = torch.xpu.optimize(self.real_model.eval(), inplace=True, auto_kernel_selection=True, graph_mode=True)
 
         return self.real_model
@@ -471,12 +478,11 @@ def get_autocast_device(dev):
 
 
 def xformers_enabled():
-    global xpu_available
     global directml_enabled
     global cpu_state
     if cpu_state != CPUState.GPU:
         return False
-    if xpu_available:
+    if is_intel_xpu():
         return False
     if directml_enabled:
         return False
@@ -503,7 +509,6 @@ def pytorch_attention_flash_attention():
     return False
 
 def get_free_memory(dev=None, torch_free_too=False):
-    global xpu_available
     global directml_enabled
     if dev is None:
         dev = get_torch_device()
@@ -515,7 +520,7 @@ def get_free_memory(dev=None, torch_free_too=False):
         if directml_enabled:
             mem_free_total = 1024 * 1024 * 1024 #TODO
             mem_free_torch = mem_free_total
-        elif xpu_available:
+        elif is_intel_xpu():
             stats = torch.xpu.memory_stats(dev)
             mem_active = stats['active_bytes.all.current']
             mem_allocated = stats['allocated_bytes.all.current']
@@ -577,7 +582,6 @@ def is_device_mps(device):
     return False
 
 def should_use_fp16(device=None, model_params=0, prioritize_performance=True):
-    global xpu_available
     global directml_enabled
 
     if device is not None:
@@ -600,7 +604,7 @@ def should_use_fp16(device=None, model_params=0, prioritize_performance=True):
     if cpu_mode() or mps_mode():
         return False #TODO ?
 
-    if xpu_available:
+    if is_intel_xpu():
         return True
 
     if torch.cuda.is_bf16_supported():
@@ -636,11 +640,10 @@ def should_use_fp16(device=None, model_params=0, prioritize_performance=True):
     return True
 
 def soft_empty_cache():
-    global xpu_available
     global cpu_state
     if cpu_state == CPUState.MPS:
         torch.mps.empty_cache()
-    elif xpu_available:
+    elif is_intel_xpu():
         torch.xpu.empty_cache()
     elif torch.cuda.is_available():
         if is_nvidia(): #This seems to make things worse on ROCm so I only do it for cuda