CSAPP hw6

6.22

$xr(r-xr)=-r^2x^2+r^2x$

$r=0.5$ 时容量最大

6.23

$4+\frac{1}{15000}\times60\times1000\times\frac{1}{2}+\frac{1}{800}\times\frac{1}{15000}\times60\times1000=6.005ms$

6.24

A

$4+2+4\times\frac{2MB}{512B}\times\frac{1}{1000}=22ms$

B

$\frac{2MB}{512B}\times6+16=24.016s$

6.25

64 24 6 2

1 30 0 2

128 22 7 3

1 29 0 3

32 22 5 5

8 24 3 5

6.26

2048 256

4 4

25 6

32 5

6.27

A

0x08a4、0x08a5、0x08a6、0x08a7

0x0704、0x0705、0x0706、0x0707

B

0x1238、0x1239、0x123a、0x123b

6.29

A

11-4: CT, 3-2: CI, 1-0: CO

B

m

h

h 0xc0

6.30

A

$C=4\times4\times8=128$

B

12-5: CT

4-2: CI

1-0: CO

6.31

A

0 0111 0001 1010

B

0x2, 0x6, 0x38

是，0xeb

6.32

A

1 0110 1110 1000

B

0x0, 0x2, 0xb7

否

6.33

0x1788、0x1789、0x178a、0x178b

0x16c8、0x16c8、0x16ca、0x16cb

6.34

m m m m m m h m

m m m m m h m h

m m m m m m h m

m m m m m h m h

6.35

m h h h m h h h

m h h h m h h h

m h h h m h h h

m h h h m h h h

6.36

A

100%

B

25%

C

25%

D

不会，每个块仍然有一次冷不命中

E

会，降低了每个块冷不命中所占的比例

6.38

A

1024

B

128

C

12.5%

6.39

A

1024

B

256

C

25%

6.40

A

1024

B

256

C

25%

6.41

25%

6.42

25%

6.43

100%