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* execution: Roll the UI cache into the outputs Currently the UI cache is parallel to the output cache with expectations of being a content superset of the output cache. At the same time the UI and output cache are maintained completely seperately, making it awkward to free the output cache content without changing the behaviour of the UI cache. There are two actual users (getters) of the UI cache. The first is the case of a direct content hit on the output cache when executing a node. This case is very naturally handled by merging the UI and outputs cache. The second case is the history JSON generation at the end of the prompt. This currently works by asking the cache for all_node_ids and then pulling the cache contents for those nodes. all_node_ids is the nodes of the dynamic prompt. So fold the UI cache into the output cache. The current UI cache setter now writes to a prompt-scope dict. When the output cache is set, just get this value from the dict and tuple up with the outputs. When generating the history, simply iterate prompt-scope dict. This prepares support for more complex caching strategies (like RAM pressure caching) where less than 1 workflow will be cached and it will be desirable to keep the UI cache and output cache in sync. * sd: Implement RAM getter for VAE * model_patcher: Implement RAM getter for ModelPatcher * sd: Implement RAM getter for CLIP * Implement RAM Pressure cache Implement a cache sensitive to RAM pressure. When RAM headroom drops down below a certain threshold, evict RAM-expensive nodes from the cache. Models and tensors are measured directly for RAM usage. An OOM score is then computed based on the RAM usage of the node. Note the due to indirection through shared objects (like a model patcher), multiple nodes can account the same RAM as their individual usage. The intent is this will free chains of nodes particularly model loaders and associate loras as they all score similar and are sorted in close to each other. Has a bias towards unloading model nodes mid flow while being able to keep results like text encodings and VAE. * execution: Convert the cache entry to NamedTuple As commented in review. Convert this to a named tuple and abstract away the tuple type completely from graph.py.