Add build-in extension "NeverOOM"

see also discussions

extensions-builtin/sd_forge_neveroom/scripts/forge_never_oom.py

@@ -0,0 +1,47 @@
+import gradio as gr
+
+from modules import scripts
+from ldm_patched.modules import model_management
+
+
+class NeverOOMForForge(scripts.Script):
+    sorting_priority = 18
+
+    def __init__(self):
+        self.previous_unet_enabled = False
+        self.original_vram_state = model_management.vram_state
+
+    def title(self):
+        return "Never OOM Integrated"
+
+    def show(self, is_img2img):
+        return scripts.AlwaysVisible
+
+    def ui(self, *args, **kwargs):
+        with gr.Accordion(open=False, label=self.title()):
+            unet_enabled = gr.Checkbox(label='Enabled for UNet (always maximize offload)', value=False)
+            vae_enabled = gr.Checkbox(label='Enabled for VAE (always tiled)', value=False)
+        return unet_enabled, vae_enabled
+
+    def process(self, p, *script_args, **kwargs):
+        unet_enabled, vae_enabled = script_args
+
+        if unet_enabled:
+            print('NeverOOM Enabled for UNet (always maximize offload)')
+
+        if vae_enabled:
+            print('NeverOOM Enabled for VAE (always tiled)')
+
+        model_management.VAE_ALWAYS_TILED = vae_enabled
+
+        if self.previous_unet_enabled != unet_enabled:
+            model_management.unload_all_models()
+            if unet_enabled:
+                self.original_vram_state = model_management.vram_state
+                model_management.vram_state = model_management.VRAMState.NO_VRAM
+            else:
+                model_management.vram_state = self.original_vram_state
+            print(f'VARM State Changed To {model_management.vram_state.name}')
+            self.previous_unet_enabled = unet_enabled
+
+        return