Question

What does MESI stand for?

(a) modified exclusive stale invalid

(b) modified exclusive shared invalid

(c) modified exclusive system input

(d) modifies embedded shared invalid

This question was posed to me in an interview for job.

The above asked question is from Writing Scheme of Cache Memory in chapter Memory Systems of Embedded Systems

Answer 1

The correct option is (b) modified exclusive shared invalid

To explain I would say: The MESI protocol supports a shared state which is a formal mechanism for controlling the cache coherency by using the bus snooping techniques. MESI refers to the states that cached data can access. In MESI protocol, multiple processors can cache shared data.