Cache

Question 1

What does inclusive mean

Answer 1

any data in lower cache levels is alo present in this cache

Question 2

What does exclusive mean

Answer 2

Data in lower cache levels is not necessarily stored in this cache

Question 3

what are the two typical schemes of inlusivity

Answer 3

all Caches are inclusive
and L2 is incluive of L1 and L3 is exclusive containing all the thinsg evicte from L2

Question 4

How is memory in caches broken up

Answer 4

Into blocks of fixed size
called cache lines
daata is transferred in blocks

Question 5

define temporal locality

Answer 5

the idea that if something has been accessed it’s likely to be accesed again
and caches make use of thsi by storing recently accessed data

Question 6

Define Spacial locality

Answer 6

very likely to need to access adjacent data

caches make use of this by moving data into cache lines at a time

Question 7

What is the Tag store

Answer 7

keeps track of which addresses are stored in cache

Question 8

What dtermines the index of a block in cache

Answer 8

the last two bits that are shared by all the words in the block
and it determines the blocks place in cache

Question 9

what determines the tag and what does it do

Answer 9

the rest of the bits not used in block offset and index
stored in the tag store to combine to make the orginal address

Question 10

what is the block offset

Answer 10

the number of bits needed to differentiate between the words in the line
size of line/size of word