The "minion cores"[1] idea from lowrisc.org might be a good early example. You can find something similar for one ARM chip I know of (TI Sitara with PRUs), but

The "minion cores"[1] idea from lowrisc.org might be a good early example. You can find something similar for one ARM chip I know of (TI Sitara with PRUs), but only one that I know of...perhaps because it's expensive to experiment like that, as you mention. [1] https://lowrisc.org/docs/memo-2014-001-tagged-memory-and-minion-cores/ https://lowrisc.org/docs/memo-2014-001-tagged-memory-and-min...