Toy SoCs, like those used in almost every single-board computer, have bad I/O, which makes them poorly suited to general-purpose clustering. Also, general-purpo

Toy SoCs, like those used in almost every single-board computer, have bad I/O, which makes them poorly suited to general-purpose clustering. Also, general-purpose clustering is not something people strive to bother with. Especially not at a performance level that is as low as a bunch of Raspis.