The article defines vertical scaling as using faster conveyer belts (serial performance) and horizontal scaling as using more conveyer belts (parallel performance).
So your example of adding more CPU cores would be horizontal scaling, while using a faster core would be vertical. Vertical scaling has diminishing returns.
Comments
The article defines vertical scaling as using faster conveyer belts (serial performance) and horizontal scaling as using more conveyer belts (parallel performance).
So your example of adding more CPU cores would be horizontal scaling, while using a faster core would be vertical. Vertical scaling has diminishing returns.