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APPENDIX 4A 155

1000
8
7
6
5
4
3 (C 1 /C 2 ) 1000
2 8
Relative combined cost (C s /C 2 ) 7 6 5 4 3 2 (C 1 /C 2 ) 100
100

10
6 8 7
5
4
(C 1 /C 2 ) 10
3
2
1
5 6 7 8 9 2 3 4 5 6 7 8 9 2 3 4 5 6 7 8 9
10 100 1000
Relative size of two levels (S 2 /S 1 )
Figure 4.22 Relationship of Average Memory Cost to Relative Memory Size for a Two-Level Memory

1

r 1

Access efficiency T 1 /T s 0.01 r 100
0.1
r 10

r 1,000
0.001
0.0 0.2 0.4 0.6 0.8 1.0
Hit ratio H
Figure 4.23 Access Efficiency as a Function of Hit Ratio (r = T 2 /T 1 )