Try again with vae tiled decoding if regular fails because of OOM.

comfy/ldm/modules/attention.py

@@ -20,11 +20,6 @@ if model_management.xformers_enabled():
 import os
 _ATTN_PRECISION = os.environ.get("ATTN_PRECISION", "fp32")
 
-try:
-    OOM_EXCEPTION = torch.cuda.OutOfMemoryError
-except:
-    OOM_EXCEPTION = Exception
-
 def exists(val):
     return val is not None
 
@@ -312,7 +307,7 @@ class CrossAttentionDoggettx(nn.Module):
                     r1[:, i:end] = einsum('b i j, b j d -> b i d', s2, v)
                     del s2
                 break
-            except OOM_EXCEPTION as e:
+            except model_management.OOM_EXCEPTION as e:
                 if first_op_done == False:
                     torch.cuda.empty_cache()
                     torch.cuda.ipc_collect()

comfy/ldm/modules/diffusionmodules/model.py

@@ -13,11 +13,6 @@ if model_management.xformers_enabled():
     import xformers
     import xformers.ops
 
-try:
-    OOM_EXCEPTION = torch.cuda.OutOfMemoryError
-except:
-    OOM_EXCEPTION = Exception
-
 def get_timestep_embedding(timesteps, embedding_dim):
     """
     This matches the implementation in Denoising Diffusion Probabilistic Models:
@@ -221,7 +216,7 @@ class AttnBlock(nn.Module):
                     r1[:, :, i:end] = torch.bmm(v, s2)
                     del s2
                 break
-            except OOM_EXCEPTION as e:
+            except model_management.OOM_EXCEPTION as e:
                 steps *= 2
                 if steps > 128:
                     raise e

comfy/ldm/modules/sub_quadratic_attention.py

@@ -24,10 +24,7 @@ except ImportError:
 from torch import Tensor
 from typing import List
 
-try:
-    OOM_EXCEPTION = torch.cuda.OutOfMemoryError
-except:
-    OOM_EXCEPTION = Exception
+import model_management
 
 def dynamic_slice(
     x: Tensor,
@@ -161,7 +158,7 @@ def _get_attention_scores_no_kv_chunking(
     try:
         attn_probs = attn_scores.softmax(dim=-1)
         del attn_scores
-    except OOM_EXCEPTION:
+    except model_management.OOM_EXCEPTION:
         print("ran out of memory while running softmax in  _get_attention_scores_no_kv_chunking, trying slower in place softmax instead")
         attn_scores -= attn_scores.max(dim=-1, keepdim=True).values
         torch.exp(attn_scores, out=attn_scores)

comfy/model_management.py

@@ -31,6 +31,11 @@ try:
 except:
     pass
 
+try:
+    OOM_EXCEPTION = torch.cuda.OutOfMemoryError
+except:
+    OOM_EXCEPTION = Exception
+
 if "--disable-xformers" in sys.argv:
     XFORMERS_IS_AVAILBLE = False
 else:

comfy/sd.py

@@ -383,12 +383,26 @@ class VAE:
             device = model_management.get_torch_device()
         self.device = device
 
-    def decode(self, samples):
+    def decode_tiled_(self, samples, tile_x=64, tile_y=64, overlap = 16):
+        decode_fn = lambda a: (self.first_stage_model.decode(1. / self.scale_factor * a.to(self.device)) + 1.0)
+        output = torch.clamp((
+            (utils.tiled_scale(samples, decode_fn, tile_x // 2, tile_y * 2, overlap, upscale_amount = 8) +
+            utils.tiled_scale(samples, decode_fn, tile_x * 2, tile_y // 2, overlap, upscale_amount = 8) +
+             utils.tiled_scale(samples, decode_fn, tile_x, tile_y, overlap, upscale_amount = 8))
+            / 3.0) / 2.0, min=0.0, max=1.0)
+        return output
+
+    def decode(self, samples_in):
         model_management.unload_model()
         self.first_stage_model = self.first_stage_model.to(self.device)
-        samples = samples.to(self.device)
+        try:
+            samples = samples_in.to(self.device)
             pixel_samples = self.first_stage_model.decode(1. / self.scale_factor * samples)
             pixel_samples = torch.clamp((pixel_samples + 1.0) / 2.0, min=0.0, max=1.0)
+        except model_management.OOM_EXCEPTION as e:
+            print("Warning: Ran out of memory when regular VAE decoding, retrying with tiled VAE decoding.")
+            pixel_samples = self.decode_tiled_(samples_in)
+
         self.first_stage_model = self.first_stage_model.cpu()
         pixel_samples = pixel_samples.cpu().movedim(1,-1)
         return pixel_samples
@@ -396,13 +410,7 @@ class VAE:
     def decode_tiled(self, samples, tile_x=64, tile_y=64, overlap = 16):
         model_management.unload_model()
         self.first_stage_model = self.first_stage_model.to(self.device)
-        decode_fn = lambda a: (self.first_stage_model.decode(1. / self.scale_factor * a.to(self.device)) + 1.0)
-        output = torch.clamp((
-            (utils.tiled_scale(samples, decode_fn, tile_x // 2, tile_y * 2, overlap, upscale_amount = 8) +
-            utils.tiled_scale(samples, decode_fn, tile_x * 2, tile_y // 2, overlap, upscale_amount = 8) +
-             utils.tiled_scale(samples, decode_fn, tile_x, tile_y, overlap, upscale_amount = 8))
-            / 3.0) / 2.0, min=0.0, max=1.0)
-
+        output = self.decode_tiled_(samples, tile_x, tile_y, overlap)
         self.first_stage_model = self.first_stage_model.cpu()
         return output.movedim(1,-1)