Upscale Image (Using Model) using CPU only?

[Oruli]

Your question

Is this expected behaviour? I can't find any information anywhere but when I run this model on a large video specifically it takes a very very long time and runs CPU at 100% across all cores

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[LukeG89]

ComfyUI is probably offloading on RAM since it's a video, if you are giving a large batch of images to Upscale Image (Using Model), it will process all the batch at the same time and that can be overwhelming for the system.
For example, if it's a 80 frames video, you are giving a batch of 80 images to the upscaler.

A good trick when upscaling videos is to convert the batch to a list and, after the process, convert the list to a batch.
This way, it will upscale a frame at a time.

[Oruli]

ComfyUI is probably offloading on RAM since it's a video, if you are giving a large batch of images to Upscale Image (Using Model), it will process all the batch at the same time and that can be overwhelming for the system. For example, if it's a 80 frames video, you are giving a batch of 80 images to the upscaler.

A good trick when upscaling videos is to convert the batch to a list and, after the process, convert the list to a batch. This way, it will upscale a frame at a time.

Well most videos are 24fps and 5+ seconds on Hunyuan, so that's a lot of images and it seems this method is even slower than before.

I'm just wondering why with 24GB of compute the GPU is only at 2GB and CPU 100%, surely it should be using the GPU to upscale?