Question

Which of the following can allocate entries in the cache for any data that is written out?

(a) write-allocate cache

(b) read-allocate cache

(c) memory-allocate cache

(d) write cache

I got this question during an online interview.

My doubt is from Writing Scheme of Cache Memory topic in section Memory Systems of Embedded Systems

Answer 1

Right choice is (a) write-allocate cache

To explain: A write-allocate cache allocates the entries in the cache for any data that is written out. If the data is transferred to the external memory so that, when it is accessed again, the data is already waiting in the cache. It works efficiently if the size of the cache is large and it does not overwrite even though it is advantageous.