-
Notifications
You must be signed in to change notification settings - Fork 0
/
Cache.java
216 lines (185 loc) · 7.17 KB
/
Cache.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
import java.io.*;
import java.util.*;
class Cache
{
public int cacheNum;
public int cacheSize;
public int associativity;
public int blockSize;
public int hitCount = 0;
public int totCount = 0;
public int cacheLen = 0;
public Entry[] list1;
public Entry[] list2;
public Entry[] list3;
public Entry[] list4;
public Cache(int associativity, int cacheNum, int cacheSize, int blockSize)
{
this.associativity = associativity;
this.cacheSize = cacheSize;
this.cacheNum = cacheNum;
this.blockSize = blockSize;
// create the array of tags based on this info
if (associativity == 1)
{
this.cacheLen = (cacheSize / (blockSize * 4));
list1 = new Entry[this.cacheLen];
}
else if (associativity == 2)
{
this.cacheLen = (cacheSize / (blockSize * 4) / 2);
list1 = new Entry[this.cacheLen];
list2 = new Entry[this.cacheLen];
}
else if (associativity == 4)
{
this.cacheLen = (cacheSize / (blockSize * 4) / 4);
list1 = new Entry[this.cacheLen];
list2 = new Entry[this.cacheLen];
list3 = new Entry[this.cacheLen];
list4 = new Entry[this.cacheLen];
}
}
public void printCache(){
double hitRate = (hitCount / (double) totCount) * 100;
System.out.println("Cache #" + cacheNum);
System.out.println("Cache size: " + cacheSize + "B" + "\t\t" + "Associativity: " + associativity + "\t\t" + "Block size: " + blockSize);
System.out.print("Hits: " + hitCount + "\t");
System.out.printf("Hit Rate: %.2f%%\n", hitRate);
System.out.print("---------------------------\n");
}
private int findIndexSmallest(int[] array)
{
int index = 0;
int min = array[index];
for (int i = 0; i < array.length; i++)
{
if (min > array[i])
{
min = array[i];
index = i;
}
}
return index;
}
private void replaceLRU(int tag, int index)
{
if (this.associativity == 2)
{
if (list1[index % this.cacheLen].lineNum < list2[index % this.cacheLen].lineNum)
list1[index % this.cacheLen] = new Entry(tag, lab5.lineNum);
else
list2[index % this.cacheLen] = new Entry(tag, lab5.lineNum);
}
if (this.associativity == 4)
{
int[] lineNums = {
list1[index % this.cacheLen].lineNum, list2[index % this.cacheLen].lineNum,
list3[index % this.cacheLen].lineNum, list4[index % this.cacheLen].lineNum
};
int smallestIndex = findIndexSmallest(lineNums);
if (smallestIndex == 0)
list1[index % this.cacheLen] = new Entry(tag, lab5.lineNum);
else if (smallestIndex == 1)
list2[index % this.cacheLen] = new Entry(tag, lab5.lineNum);
else if (smallestIndex == 2)
list3[index % this.cacheLen] = new Entry(tag, lab5.lineNum);
else if (smallestIndex == 3)
list4[index % this.cacheLen] = new Entry(tag, lab5.lineNum);
}
}
public void update(String line)
{
int tag = getTag(line);
int index = getIndex(line);
if (this.associativity == 1)
{
if (list1[index % this.cacheLen] == null)
list1[index % this.cacheLen] = new Entry(tag, lab5.lineNum);
else if (list1[index % this.cacheLen].tag == tag)
this.hitCount++;
else
list1[index % this.cacheLen].tag = tag;
this.totCount++;
}
else if (this.associativity == 2)
{
if (list1[index % this.cacheLen] != null && list1[index % this.cacheLen].tag == tag)
{
list1[index % this.cacheLen].lineNum = lab5.lineNum;
this.hitCount++;
}
else if (list2[index % this.cacheLen] != null && list2[index % this.cacheLen].tag == tag)
{
list2[index % this.cacheLen].lineNum = lab5.lineNum;
this.hitCount++;
}
else if (list1[index % this.cacheLen] == null)
list1[index % this.cacheLen] = new Entry(tag, lab5.lineNum);
else if (list2[index % this.cacheLen] == null)
list2[index % this.cacheLen] = new Entry(tag, lab5.lineNum);
else
replaceLRU(tag, index);
this.totCount++;
}
else if (this.associativity == 4)
{
if (list1[index % this.cacheLen] != null && list1[index % this.cacheLen].tag == tag)
{
list1[index % this.cacheLen].lineNum = lab5.lineNum;
this.hitCount++;
}
else if (list2[index % this.cacheLen] != null && list2[index % this.cacheLen].tag == tag)
{
list2[index % this.cacheLen].lineNum = lab5.lineNum;
this.hitCount++;
}
else if (list3[index % this.cacheLen] != null && list3[index % this.cacheLen].tag == tag)
{
list3[index % this.cacheLen].lineNum = lab5.lineNum;
this.hitCount++;
}
else if (list4[index % this.cacheLen] != null && list4[index % this.cacheLen].tag == tag)
{
list4[index % this.cacheLen].lineNum = lab5.lineNum;
this.hitCount++;
}
else if (list1[index % this.cacheLen] == null)
list1[index % this.cacheLen] = new Entry(tag, lab5.lineNum);
else if (list2[index % this.cacheLen] == null)
list2[index % this.cacheLen] = new Entry(tag, lab5.lineNum);
else if (list3[index % this.cacheLen] == null)
list3[index % this.cacheLen] = new Entry(tag, lab5.lineNum);
else if (list4[index % this.cacheLen] == null)
list4[index % this.cacheLen] = new Entry(tag, lab5.lineNum);
else
replaceLRU(tag, index);
this.totCount++;
}
}
private int getTag(String line)
{
int address, bitsOfIndex, tag, blockOffset, width, bitshift = 0;
width = blockSize * 4;
address = Integer.parseInt(line, 16);
bitsOfIndex = (int)(Math.log(this.cacheLen/width) / Math.log(2));
blockOffset = (int)(this.blockSize / 2);
bitshift = bitsOfIndex + blockOffset + 2;
tag = address >> bitshift;
return tag;
}
private int getIndex(String line)
{
int address, bitsOfIndex, blockOffset, width, bitshift = 0, mask = 0, index;
//System.out.println(line);
width = blockSize * 4;
address = Integer.parseInt(line, 16);
bitsOfIndex = (int)(Math.log(this.cacheLen) / Math.log(2));
blockOffset = (int)(this.blockSize / 2);
index = address >> (blockOffset + 2);
mask = ~(~0 << bitsOfIndex);
index = index & mask;
//System.out.println("mask: " + mask + " index: " + index);
return index;
}
}