Parallel scanning of large data sets, like object graphs. You don't want to copy the entire graph to each thread, nor do fine grained passing around of a node

Parallel scanning of large data sets, like object graphs. You don't want to copy the entire graph to each thread, nor do fine grained passing around of a node per traversal. However, if what this exposes is just an array of bytes, that's less useful as you have to cast your own object model on top of it. Large image data might be still useful as just bytes, with threads running convolutions or NNs on it.