Question $4$

Suppose your cache system has three level caches and

here is the system's properties:

Question $4\mathrm{.}2$

What is the percentage of total accesses that hit in the

L$3$ cache?

$3\%$

$4\%$

$5\%$

$6\%$

Question $4\mathrm{.}1$

What is the percentage of total accesses that hit in the

L$2$ cache?

Hint:

It might be easier to think about this problem in terms of

a fraction of $100$ total accesses

Question $4\mathrm{.}3$

What is the AMAT of this memory hierarchy?

Hint:

AMAT $=$ Cycles to access $L1+$ additional cycles to access

$L2**$ fraction of total accesses reaching $L2+$ additional

cycles to access $L{3}^{**}$ fraction of total accesses reaching

L$3+$ additional cycles to access main memory $*$ fraction

of total accesses reaching main memory

Hint:

Local miss rates refer to the percentage of accesses

reaching that level cache that miss in that cache $($i$.$e$.,$

if the local miss rate for $L2$ cache is $50\%,$ then half of

the accesses that reach the $L2$ cache miss in the L$2$

cache$)$

Global miss rates refer to the percentage of total

accesses that miss at that level cache $($i$.$e$.,$ if the

global miss rate for L$2$ cache is $50\%,$ then half of all

memory accesses miss in the L$2$ cache$)$