Java Cache模拟器（图形界面）
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内容图文
一、设计思路
（说明，本文来自于《计算机体系结构——量化研究方法》的课程实验）
1.综述
我沿用了助教给的Java模版，完成了基本要求：设置Cache总大小和块大小、设置映射机制、设置替换策略、设置写策略，也完成了所有较高要求：能把Cache分为数据Cache和指令Cache、能设置预取策略、能设置写不命中调块策略并且有UI界面。
在设计上我充分利用了面向对象的设计思路，把各个逻辑部件都封装成内部类，模拟各种行为的方法也封装在内部类的方法中。比较重要的内部类有Instruction类（模拟数据流个条指令）、CacheBlock（模拟各个Cache块特性）、Cache（封装所有Cache块，模拟Cache读写等）。
UI来配置Cache，要点在于将JCombox的选项映射到实际值。我设计的思路沿用模版，加载了din类型流文件后把指令全部读取到内存。这时候我把所有的Cache设置全部保存一遍固定下来并初始化Cache，在运行过程中修改各项JCombox的选项并不会改变当前Cache的设置，仅在下一次加载din流文件时重新载入配置。
下面详细介绍重要方法和各个内部类的设计思想（按照程序逻辑顺序）。
2.内部类CacheBlock
CacheBlock类模拟Cache的块，是一个纯模型类，每一个CacheBlock有一个tag标识（定义同书上Cache地址的块地址的tag）、dirty脏位（表示该块是否被修改过且没有写回Memory）、count计数（用于LRU计算访问次数，这里读写CacheBlock都会增加count）、time（组内Cache块入Cache时间，是一个从0-MAX_LONG的long长整型变量）。
CacheBlock需要一个tag初始化，初始化块count为0、time为-1（由Cache为每组设置的计时器在外部分配入组time）且该块是干净的。
3.Cache初始化，从UI选项到配置的映射
Cache初始化在点击加载din流文件的按键时完成（尽管很奇怪，但是我读din文件时就需要初始化每条Instruction，而初始化Instruction类需要知道当前Cache的配置，所以Cache配置需要先完成，将在后面的分条中介绍。我之前设计的是CachePrepare->ReadFile->CacheInit，后来把CachePrepare和CacheInit合并了）。
初始化Cache之前先置零所有统计量，根据mcacheType决定的类型算出Cache总大小（多少B）以及块大小（多少B）。然后以Cache总大小和块大小来实例化Cache类，接下来的初始化工作在下一小节介绍。
4.内部类Cache
Cache这种以组index作索引，组内块数固定的编址模式，很容易让我们想到用二维数组来模拟。因此最重要的字段是private CacheBlock cache[][]，第一维坐标表示组，第二维坐标表示组内块编号。
除此之外，Cache类有一系列记录其属性的字段：cacheSize总大小、blockSize块大小、blockNum总block个数、blockOffset块内地址所占32位2进制地址位数、blockNumInAGroup一个组内块数量、groupNum组总数以及groupOffset组index寻址所占
32位2进制地址位数。这些属性计算公式如下：
blockNum = cacheSize / blockSize;
blockOffset = log2(blockSize);
blockNumInAGroup = pow(2, mwayIndex);
groupNum = blockNum / blockNumInAGroup;
groupOffset = log2(groupNum);
有了这些属性（groupOffset和blockOffset）即可把32位地址分割为三项：tag＋index＋inblockAddr，后面Instruction类介绍时会再次提到。
最后Cache还为每个组设置了一个入组时间计数器groupFIFOTime[]，目的是为了分配实现先进先出队列时选择最早入队的块的time属性。每加载一个新的块入组，groupFIFOTime[index]加一。
Cache类有一系列模拟Cache行为的方法，如read读取Cache、write写入Cache、prefetch预取块、replaceCacheBlock替换块、loadToCache把块从内存加载到Cache等。下面分别介绍这几种方法具体实现：
（1）read
public boolean read(int tag, int index, int inblockAddr) {
for (int i = 0; i < blockNumInAGroup; i++) {
if (cache[index][i].tag == tag) {//hit
cache[index][i].count++;
/*
Now pretend to send data to CPU
*/
return true;
}
}
return false;
}
读方法传入一个地址的tag、index和inblockAddr，其中inblockAddr并不会用到，这里是为了模拟真实取块内某字节数据所需要提供的inblockAddr。
有了index就直接在该index索引的组内枚举blockNumInAGroup个块，对比每个块的tag。注意：这次实验没有说性能上的优化，那么我这里用O(n)的遍历，如果我们考虑到快速定位tag块可以用HashMap实现（但硬件上应该不会设计这么复杂的数据结构）。
read方法找到该块则返回true，没找到则返回false。其他Cache行为逻辑在单步执行那个方法中完成。
（2）write
public boolean write(int tag, int index, int inblockAddr) {
for (int i = 0; i < blockNumInAGroup; i++) {
if (cache[index][i].tag == tag) {//hit
cache[index][i].count++;
cache[index][i].dirty = true;
/*
Now pretend to write data to Cache
*/
if (mwriteIndex == 0) {//write back
//doing nothing
} else if (mwriteIndex == 1) {//write through
memoryWriteTime++;
/*
pretending to write dirty cache to memory after write to cache
*/
cache[index][i].dirty = false;
}
return true;
}
}
return false;
}
write时在Cache中找目标块也是遍历比较tag，若找到目标则改块访问次数++，dirty置位。模拟写入后（所有模拟动作部分我都用注释标注），判断Cache写回方法，若写回法则此时什么也不做（等待该脏块被替换出去时才写回Memory）；若是写之直达法则模拟写Memory并擦除脏位。和read一样找到目标块返回true，否则返回false，其他逻辑交给外部处理。
（3）prefetch
public void prefetch(int nextBlockAddr) {
int nextTag = nextBlockAddr / pow(2, groupOffset + blockOffset);
int nextIndex = nextBlockAddr / pow(2, blockOffset) % pow(2, groupOffset);
replaceCacheBlock(nextTag, nextIndex);
}
预取我只做了指令预取（外部逻辑调用），即某条指令所在块Miss时预取下一个指令块。牢记Cache地址＝tag: index: inblockAddr，用两个offset位数配合整除和取余运算获取这两部分的tag和index然后调用replaceCacheBlock选择合适的替换算法选择替换块并加载该下一个指令块。
（4）replaceCacheBlock
public void replaceCacheBlock(int tag, int index) {
if (mreplaceIndex == 0) {//LRU
int lruBlock = 0;
for (int i = 1; i < blockNumInAGroup; i++) {
if (cache[index][lruBlock].count > cache[index][i].count) {
lruBlock = i;
}
}
loadToCache(tag, index, lruBlock);
} else if (mreplaceIndex == 1) {//FIFO
int fifoBlock = 0;
for (int i = 1; i < blockNumInAGroup; i++) {
if (cache[index][fifoBlock].time > cache[index][i].time) {
fifoBlock = i;
}
}
loadToCache(tag, index, fifoBlock);
} else if (mreplaceIndex == 2) {//random
int ranBlock = random(0, blockNumInAGroup);
loadToCache(tag, index, ranBlock);
}
}
根据不同的替换策略选取不同的被替换块，LRU则遍历组内最近最少被使用的块用loadToCache方法替换出去（这里使用优先队列是不是性能更好？），FIFO则根据记录组内入Cache时间的time属性选取最先入组的块替换出去，随机则比较简单直接产生一个组内编号的随机数替换。
（5）loadToCache
private void loadToCache(int tag, int index, int groupAddr) {
if (mwriteIndex == 0 && cache[index][groupAddr].dirty) {
//write back before being replaced;
memoryWriteTime++;
}
cache[index][groupAddr].tag = tag;
cache[index][groupAddr].count = 1;
cache[index][groupAddr].dirty = false;
cache[index][groupAddr].time = groupFIFOTime[index];
groupFIFOTime[index]++;
}
替换一个块，首先需要判断是不是用写回法，若是则一定在该Cache块替换出去之前写回内存，然后再设置块的tag位、count置1访问一次、非脏，且用groupFIFOTime分配入组时间。
5.内部类Instruction
Instruction类实例化需要传入din数据流文件中一条数据流指令的opt操作码和地址addr。构造函数内部实现了一个数据选择器和译码器，首先用HexAddr2BinAddr()方法将10进制地址转换为32位2进制地址（32位01字符串）。然后根据Cache设置中计算出的groupOffset和blockOffset分割该字符串，得到tag、index、inblockAddr和blockAddr（tag:index）。注意，这里分割使用的Offset需要考虑Cache类型，统一Cache还是独立Cache／数据Cache还是指令Cache。
HexAddr2BinAddr()就是无脑的switch case转换即可，之前注意补0补齐32位地址即可。
6.内部类DinFileFilter
DinFileFilter是个辅助类，辅助JFileChooser选出我们要的din类型的文件，继承FileFilter类重写accept方法即可。
7.执行（单步、步进到底）和统计量
单步执行需要定义一个ip指针，指向当前执行数据流指令的index。ip等于0时清空一次Cache、重置所有统计量并把UI显示统计量的部分清空刷新。instructions数组中存储在读取din文件就实例化的Instruction实例，在单步执行时我们可以直接利用分割好的地址。取得当前指令后要做的首要事情就是判断Cache类型，统一Cache的指令和数据是存在一个Cache中，分离Cache中他们是分开存储的。下面以分离Cache为例简要分析：
（1）读数据
if (opt == 0) {// read data
isHit = dCache.read(tag, index, inblockAddr);
if (isHit) {
readDataHitTime++;
} else {
readDataMissTime++;
/*
Now pretend to find the block in memory
*/
dCache.replaceCacheBlock(tag, index);
/*
Now pretend to load the data in block into CPU
*/
}
}
读数据访问dCache，read方法返回是否命中，更新响应统计量计数。若不命中则模拟从Memory调块 -> 调用replaceCacheBlock方法替换旧块并装入新块 -> 最后模拟把这个block中的目标数据返回给CPU。
（2）写数据
<span style="white-space:pre"> </span>else if (opt == 1) {// write data
isHit = dCache.write(tag, index, inblockAddr);
if (isHit) {
writeDataHitTime++;
} else {
writeDataMissTime++;
/*
Now pretend to find the block in memory
*/
if (mallocIndex == 0) {//write alloc
/*
load the target block into Cache
*/
dCache.replaceCacheBlock(tag, index);
/*
pretend to write into the loaded Cache block
*/
dCache.write(tag, index, inblockAddr);
} else if (mallocIndex == 1) {//no write alloc
/*
do not load the written-missed block into Cache
just pretend to write to memory
*/
memoryWriteTime++;
}
}
写数据同样是针对dCache，write返回命中与否并据此更新统计量。若写不命中，模拟在Memory中找到该块，根据写不命中策略决定是否把不命中块加载到Cache中：若使用按写分配策略则调该Miss块入Cache，同样用replaceCacheBlock方法并模拟write（注意这里要再调一次write，且不记录模拟统计值）；若不按写分配则直接模拟写修改MEM。
（3）读指令
} else if (opt == 2) {// read instruction
isHit = iCache.read(tag, index, inblockAddr);
if (isHit) {
readInstHitTime++;
} else {
readInstMissTime++;
/*
Now pretend to find the block in memory
*/
iCache.replaceCacheBlock(tag, index);
/*
Now pretend to load the data in block into CPU
*/
if (mprefetchIndex == 0) {// do not prefetch
//doing nothing
} else if (mprefetchIndex == 1){// prefetch if instruction missed!
iCache.prefetch(instructions[ip].blockAddr + 1);
}
}
}
读指令调用iCache指令Cache的read方法，其他跟dCache读数据一样，除了需要判断一下用不用预取，若需要则传入下一个指令块地址预取该块。
二、分析结论
略，以后补充
三、说明
实验中我和助教给的c++程序比较了几组Cache设置，跑出来结果是一样的。但有的时候偶尔统计不一样，即使所有设置都一样。排除随机因素如随机替换，我给出一点可能不太正确的解释：比如LRU如果组内有某多个块的count值相同，那么我写的程序和助教给的程序选择的替换块可能不同，因此最后结果可能有细微差别（差别不大，1-2条Miss或Hit统计差别）。
我暂时认为我的程序没有问题，但也不能保证...若有Bug请提出，谢谢啦！
四、完整代码
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.io.File;
import javax.swing.*;
import javax.swing.border.EtchedBorder;
import java.lang.*;
import java.util.*;
public class MyCacheSim extends JFrame implements ActionListener {
private static final long serialVersionUID = 1L;
/*
ui property
*/
private JPanel panelTop, panelLeft, panelRight, panelBottom;
private JButton execStepBtn, execAllBtn, fileBotton;
private JComboBox<String> csBox, bsBox, wayBox, replaceBox, prefetchBox, writeBox, allocBox;
private JComboBox<String> icsBox, dcsBox;
private JFileChooser fileChooser;
private JLabel labelTop,labelLeft,rightLabel,bottomLabel,fileLabel,fileAddrBtn, stepLabel1, stepLabel2, csLabel, bsLabel, wayLabel, replaceLabel, prefetchLabel, writeLabel, allocLabel;
private JLabel icsLabel, dcsLabel;
private JLabel resultTagLabel[][];
private JLabel resultDataLabel[][];
private JLabel accessTypeTagLabel, addressTagLabel, blockNumberTagLabel, tagTagLabel, indexTagLabel, inblockAddressTagLabel, hitTagLabel;
private JLabel accessTypeDataLabel, addressDataLabel, blockNumberDataLabel, tagDataLabel, indexDataLabel, inblockAddressDataLabel, hitDataLabel;
private JRadioButton unifiedCacheButton, separateCacheButton;
/*
options section
*/
private final String cachesize[] = { "2KB", "8KB", "32KB", "128KB", "512KB", "2MB" };
private final String scachesize[] = { "1KB", "4KB", "16KB", "64KB", "256KB", "1MB" };
private final String blocksize[] = { "16B", "32B", "64B", "128B", "256B" };
private final String way[] = { "直接映象", "2路", "4路", "8路", "16路", "32路" };
private final String replace[] = { "LRU", "FIFO", "RAND" };
private final String pref[] = { "不预取", "不命中预取" };
private final String write[] = { "写回法", "写直达法" };
private final String alloc[] = { "按写分配", "不按写分配" };
//private final String typename[] = { "读数据", "写数据", "读指令" };
//private String hitname[] = {"不命中", "命中" };
private final String resultTags[][] = {
{"访问总次数:", "不命中次数:", "不命中率:"},
{"读指令次数:", "不命中次数:", "不命中率:"},
{"读数据次数:", "不命中次数:", "不命中率:"},
{"写数据次数:", "不命中次数:", "不命中率:"}
};
/*
loading file
*/
private File file;
/*
user options record
*/
private int csIndex, bsIndex, wayIndex, replaceIndex, prefetchIndex, writeIndex, allocIndex;
private int mcsIndex, mbsIndex, mwayIndex, mreplaceIndex, mprefetchIndex, mwriteIndex, mallocIndex;
private int icsIndex, dcsIndex, micsIndex, mdcsIndex;
private int cacheType = 0, mcacheType = 0;
/*
instruction class
*/
private class Instruction {
int opt;
int tag;
int index;
int blockAddr;
int inblockAddr;
String addr;
public Instruction(int opt, String addr) {
this.opt = opt;
this.addr = addr;
String baddr = this.HexAddr2BinAddr();
//System.out.println(baddr);
if (mcacheType == 0 && uCache != null) {
this.tag = Integer.parseInt(baddr.substring(0, 32 - uCache.blockOffset - uCache.groupOffset), 2);
this.index = Integer.parseInt(baddr.substring(32 - uCache.blockOffset - uCache.groupOffset, 32 - uCache.blockOffset), 2);
this.blockAddr = Integer.parseInt(baddr.substring(0, 32 - uCache.blockOffset), 2);
this.inblockAddr = Integer.parseInt(baddr.substring(32 - uCache.blockOffset), 2);
}
if (mcacheType == 1 && iCache != null && dCache != null) {
if (opt == 0 || opt == 1) {
this.tag = Integer.parseInt(baddr.substring(0, 32 - dCache.blockOffset - dCache.groupOffset), 2);
this.index = Integer.parseInt(baddr.substring(32 - dCache.blockOffset - dCache.groupOffset, 32 - dCache.blockOffset), 2);
this.blockAddr = Integer.parseInt(baddr.substring(0, 32 - dCache.blockOffset), 2);
this.inblockAddr = Integer.parseInt(baddr.substring(32 - dCache.blockOffset), 2);
} else if (opt == 2) {
this.tag = Integer.parseInt(baddr.substring(0, 32 - iCache.blockOffset - iCache.groupOffset), 2);
this.index = Integer.parseInt(baddr.substring(32 - iCache.blockOffset - iCache.groupOffset, 32 - iCache.blockOffset), 2);
this.blockAddr = Integer.parseInt(baddr.substring(0, 32 - iCache.blockOffset), 2);
this.inblockAddr = Integer.parseInt(baddr.substring(32 - iCache.blockOffset), 2);
}
}
}
public String description() {
return "opt = " + opt + ", tag = " + tag + ", index = " + index + ", inblockAddr = " + inblockAddr;
}
private String HexAddr2BinAddr() {
StringBuffer sb = new StringBuffer();
int zero = 8 - this.addr.length();
for (int i = 0; i < zero; i++) {
sb.append("0000");
}
for (int i = 0; i < this.addr.length(); i++) {
switch(this.addr.charAt(i)) {
case '0':
sb.append("0000");
break;
case '1':
sb.append("0001");
break;
case '2':
sb.append("0010");
break;
case '3':
sb.append("0011");
break;
case '4':
sb.append("0100");
break;
case '5':
sb.append("0101");
break;
case '6':
sb.append("0110");
break;
case '7':
sb.append("0111");
break;
case '8':
sb.append("1000");
break;
case '9':
sb.append("1001");
break;
case 'a':
sb.append("1010");
break;
case 'b':
sb.append("1011");
break;
case 'c':
sb.append("1100");
break;
case 'd':
sb.append("1101");
break;
case 'e':
sb.append("1110");
break;
case 'f':
sb.append("1111");
break;
default:
System.out.println("Data Error!");
}
}
return sb.toString();
}
}
/*
instruction property
*/
private Instruction instructions[];
private final int INSTRUCTION_MAX_SIZE = 100000;
private int isize;
private int ip;
private class CacheBlock {
int tag;
boolean dirty;
int count;
long time;
public CacheBlock(int tag) {
this.tag = tag;
dirty = false;
count = 0;
time = -1L;
}
}
/*
cache class
*/
private class Cache {
/*
cache property
*/
private CacheBlock cache[][];
private int cacheSize;
private int blockSize;
private int blockNum;
private int blockOffset;
private int blockNumInAGroup;
private int groupNum;
private int groupOffset;
private long groupFIFOTime[];
public Cache(int csize, int bsize) {
cacheSize = csize;
blockSize = bsize;
blockNum = cacheSize / blockSize;
blockOffset = log2(blockSize);
blockNumInAGroup = pow(2, mwayIndex);
groupNum = blockNum / blockNumInAGroup;
groupOffset = log2(groupNum);
cache = new CacheBlock[groupNum][blockNumInAGroup];
for (int i = 0; i < groupNum; i++) {
for (int j = 0; j < blockNumInAGroup; j++) {
cache[i][j] = new CacheBlock(-1);
}
}
groupFIFOTime = new long[groupNum];
}
public boolean read(int tag, int index, int inblockAddr) {
for (int i = 0; i < blockNumInAGroup; i++) {
if (cache[index][i].tag == tag) {//hit
cache[index][i].count++;
/*
Now pretend to send data to CPU
*/
return true;
}
}
return false;
}
public boolean write(int tag, int index, int inblockAddr) {
for (int i = 0; i < blockNumInAGroup; i++) {
if (cache[index][i].tag == tag) {//hit
cache[index][i].count++;
cache[index][i].dirty = true;
/*
Now pretend to write data to Cache
*/
if (mwriteIndex == 0) {//write back
//doing nothing
} else if (mwriteIndex == 1) {//write through
memoryWriteTime++;
/*
pretending to write dirty cache to memory after write to cache
*/
cache[index][i].dirty = false;
}
return true;
}
}
return false;
}
public void prefetch(int nextBlockAddr) {
int nextTag = nextBlockAddr / pow(2, groupOffset + blockOffset);
int nextIndex = nextBlockAddr / pow(2, blockOffset) % pow(2, groupOffset);
replaceCacheBlock(nextTag, nextIndex);
}
public void replaceCacheBlock(int tag, int index) {
if (mreplaceIndex == 0) {//LRU
int lruBlock = 0;
for (int i = 1; i < blockNumInAGroup; i++) {
if (cache[index][lruBlock].count > cache[index][i].count) {
lruBlock = i;
}
}
loadToCache(tag, index, lruBlock);
} else if (mreplaceIndex == 1) {//FIFO
int fifoBlock = 0;
for (int i = 1; i < blockNumInAGroup; i++) {
if (cache[index][fifoBlock].time > cache[index][i].time) {
fifoBlock = i;
}
}
loadToCache(tag, index, fifoBlock);
} else if (mreplaceIndex == 2) {//random
int ranBlock = random(0, blockNumInAGroup);
loadToCache(tag, index, ranBlock);
}
}
private void loadToCache(int tag, int index, int groupAddr) {
if (mwriteIndex == 0 && cache[index][groupAddr].dirty) {
//write back before being replaced;
memoryWriteTime++;
}
cache[index][groupAddr].tag = tag;
cache[index][groupAddr].count = 1;
cache[index][groupAddr].dirty = false;
cache[index][groupAddr].time = groupFIFOTime[index];
groupFIFOTime[index]++;
}
public void description() {
System.out.println("cacheSize = " + cacheSize);
System.out.println("blockSize = " + blockSize);
System.out.println("blockNum = " + blockNum);
System.out.println("blockOffset = " + blockOffset);
System.out.println("blockNumInAGroup = " + blockNumInAGroup);
System.out.println("groupNum = " + groupNum);
System.out.println("groupOffset = " + groupOffset);
}
}
Cache uCache, iCache, dCache;
/*
* statistic property
*/
private int readDataMissTime, readInstMissTime, readInstHitTime, readDataHitTime;
private int writeDataHitTime, writeDataMissTime;
private int memoryWriteTime;
/*
* JFileChooser Filter Class
*/
private class DinFileFilter extends javax.swing.filechooser.FileFilter{
public boolean accept(File f) {
if (f.isDirectory()) return true;
String name = f.getName();
return name.endsWith(".din") || name.endsWith(".DIN");
}
public String getDescription() {
return ".din";
}
}
/*
* cache simulator class
*/
public MyCacheSim(){
super("Cache Simulator");
fileChooser = new JFileChooser();
fileChooser.setFileFilter(new DinFileFilter());
draw();
}
public void actionPerformed(ActionEvent e) {
if (e.getSource() == execAllBtn) {
simExecAll();
}
if (e.getSource() == execStepBtn) {
simExecStep(true);
}
if (e.getSource() == fileBotton){
int fileOver = fileChooser.showOpenDialog(null);
if (fileOver == 0) {
String path = fileChooser.getSelectedFile().getAbsolutePath();
fileAddrBtn.setText(path);
file = new File(path);
/*
fix the setting
*/
mcacheType = cacheType;
mcsIndex = csIndex;
micsIndex = icsIndex;
mdcsIndex = dcsIndex;
mbsIndex = bsIndex;
mwayIndex = wayIndex;
mreplaceIndex = replaceIndex;
mprefetchIndex = prefetchIndex;
mwriteIndex = writeIndex;
mallocIndex = allocIndex;
initCache();
readFile();
reloadUI();
}
}
}
/*
* 初始化 Cache 模拟器
*/
private void initCache() {
/*
reset statistic properties
*/
readDataMissTime = 0;
readInstMissTime = 0;
readDataHitTime = 0;
readInstHitTime = 0;
writeDataHitTime = 0;
writeDataMissTime = 0;
memoryWriteTime = 0;
/*
Cache initialization
*/
if (mcacheType == 0) {
uCache = new Cache(2 * 1024 * pow(4, mcsIndex), 16 * pow(2, mbsIndex));
iCache = null;
dCache = null;
System.out.println("Unified Cache:");
uCache.description();
} else if (mcacheType == 1) {
uCache = null;
iCache = new Cache(1 * 1024 * pow(4, micsIndex), 16 * pow(2, mbsIndex));
dCache = new Cache(1 * 1024 * pow(4, mdcsIndex), 16 * pow(2, mbsIndex));
System.out.println("Instruction Cache:");
iCache.description();
System.out.println("Data Cache:");
dCache.description();
}
}
/*
* 将指令和数据流从文件中读入
*/
private void readFile() {
try {
Scanner s = new Scanner(file);
instructions = new Instruction[INSTRUCTION_MAX_SIZE];
isize = 0;
ip = 0;
while(s.hasNextLine()) {
String line = s.nextLine();
String[] items = line.split(" ");
instructions[isize] = new Instruction(Integer.parseInt(items[0].trim()), items[1].trim());
isize++;
}
} catch(Exception e) {
e.printStackTrace();
}
}
private void reloadUI() {
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 2; j++) {
resultDataLabel[i][j].setText("0");
}
resultDataLabel[i][2].setText("0.00%");
}
accessTypeDataLabel.setText("--");
addressDataLabel.setText("--");
blockNumberDataLabel.setText("--");
tagDataLabel.setText("--");
indexDataLabel.setText("--");
inblockAddressDataLabel.setText("--");
hitDataLabel.setText("--");
}
/*
* 模拟单步执行
*/
private void simExecStep(boolean oneStepExec) {
ip %= isize;
if (ip == 0) {
initCache();
reloadUI();
}
int opt = instructions[ip].opt;
int index = instructions[ip].index;
int tag = instructions[ip].tag;
int inblockAddr = instructions[ip].inblockAddr;
//System.out.printf("opt = %d, tag = %d, index = %d, inblockAddr = %d\n", opt, tag, index, inblockAddr);
System.out.println(instructions[ip].description());
boolean isHit = false;
if (mcacheType == 0) {
/*
unified cache
*/
if (opt == 0) {// read data
isHit = uCache.read(tag, index, inblockAddr);
if (isHit) {
readDataHitTime++;
} else {
readDataMissTime++;
/*
Now pretend to find the block in memory
*/
uCache.replaceCacheBlock(tag, index);
/*
Now pretend to load the data in block into CPU
*/
}
} else if (opt == 1) {// write data
isHit = uCache.write(tag, index, inblockAddr);
if (isHit) {
writeDataHitTime++;
} else {
writeDataMissTime++;
/*
Now pretend to find the block in memory
*/
if (mallocIndex == 0) {//write alloc
/*
load the target block into Cache
*/
uCache.replaceCacheBlock(tag, index);
/*
pretend to write into the loaded Cache block
*/
uCache.write(tag, index, inblockAddr);
} else if (mallocIndex == 1) {//no write alloc
/*
do not load the written-missed block into Cache
just pretend to write to memory
*/
memoryWriteTime++;
}
}
} else if (opt == 2) {// read instruction
isHit = uCache.read(tag, index, inblockAddr);
if (isHit) {
readInstHitTime++;
} else {
readInstMissTime++;
/*
Now pretend to find the block in memory
*/
uCache.replaceCacheBlock(tag, index);
/*
Now pretend to load the data in block into CPU
*/
if (mprefetchIndex == 0) {// do not prefetch
//doing nothing
} else if (mprefetchIndex == 1){// prefetch if instruction missed!
uCache.prefetch(instructions[ip].blockAddr + 1);
}
}
}
} else if (mcacheType == 1) {
/*
seperated cache
*/
if (opt == 0) {// read data
isHit = dCache.read(tag, index, inblockAddr);
if (isHit) {
readDataHitTime++;
} else {
readDataMissTime++;
/*
Now pretend to find the block in memory
*/
dCache.replaceCacheBlock(tag, index);
/*
Now pretend to load the data in block into CPU
*/
}
} else if (opt == 1) {// write data
isHit = dCache.write(tag, index, inblockAddr);
if (isHit) {
writeDataHitTime++;
} else {
writeDataMissTime++;
/*
Now pretend to find the block in memory
*/
if (mallocIndex == 0) {//write alloc
/*
load the target block into Cache
*/
dCache.replaceCacheBlock(tag, index);
/*
pretend to write into the loaded Cache block
*/
dCache.write(tag, index, inblockAddr);
} else if (mallocIndex == 1) {//no write alloc
/*
do not load the written-missed block into Cache
just pretend to write to memory
*/
memoryWriteTime++;
}
}
} else if (opt == 2) {// read instruction
isHit = iCache.read(tag, index, inblockAddr);
if (isHit) {
readInstHitTime++;
} else {
readInstMissTime++;
/*
Now pretend to find the block in memory
*/
iCache.replaceCacheBlock(tag, index);
/*
Now pretend to load the data in block into CPU
*/
if (mprefetchIndex == 0) {// do not prefetch
//doing nothing
} else if (mprefetchIndex == 1){// prefetch if instruction missed!
iCache.prefetch(instructions[ip].blockAddr + 1);
}
}
}
}
if (oneStepExec || ip == isize - 1) {
statisticUIUpdate(instructions[ip], isHit);
}
ip++;
}
private void statisticUIUpdate(Instruction inst, boolean isHit) {
int totalMissTime = readInstMissTime + readDataMissTime + writeDataMissTime;
int totalVisitTime = totalMissTime + readInstHitTime + readDataHitTime + writeDataHitTime;
resultDataLabel[0][0].setText(totalVisitTime + "");
resultDataLabel[0][1].setText(totalMissTime + "");
if (totalVisitTime > 0) {
double missRate = ((double)totalMissTime / (double)totalVisitTime) * 100;
resultDataLabel[0][2].setText(String.format("%.2f", missRate) + "%");
}
resultDataLabel[1][0].setText((readInstHitTime + readInstMissTime) + "");
resultDataLabel[1][1].setText(readInstMissTime + "");
if (readInstMissTime + readInstHitTime > 0) {
double missRate = ((double)readInstMissTime/(double)(readInstMissTime + readInstHitTime)) * 100;
resultDataLabel[1][2].setText(String.format("%.2f", missRate) + "%");
}
resultDataLabel[2][0].setText((readDataHitTime + readDataMissTime) + "");
resultDataLabel[2][1].setText(readDataMissTime + "");
if (readDataMissTime + readDataHitTime > 0) {
double missRate = ((double)readDataMissTime/(double)(readDataMissTime + readDataHitTime)) * 100;
resultDataLabel[2][2].setText(String.format("%.2f", missRate) + "%");
}
resultDataLabel[3][0].setText((writeDataHitTime + writeDataMissTime) + "");
resultDataLabel[3][1].setText(writeDataMissTime + "");
if (writeDataMissTime + writeDataHitTime > 0) {
double missRate = ((double)writeDataMissTime/(double)(writeDataMissTime + writeDataHitTime)) * 100;
resultDataLabel[3][2].setText(String.format("%.2f", missRate) + "%");
}
if (inst.opt == 0) {
accessTypeDataLabel.setText("读指令");
} else if (inst.opt == 1) {
accessTypeDataLabel.setText("读数据");
} else if (inst.opt == 2) {
accessTypeDataLabel.setText("写数据");
} else {
accessTypeDataLabel.setText("非法指令");
}
addressDataLabel.setText(inst.addr);
blockNumberDataLabel.setText(inst.blockAddr + "");
tagDataLabel.setText(inst.tag + "");
indexDataLabel.setText(inst.index + "");
inblockAddressDataLabel.setText(inst.inblockAddr + "");
if (isHit) {
hitDataLabel.setText("命中");
} else {
hitDataLabel.setText("未命中");
}
}
/*
* 模拟执行到底
*/
private void simExecAll() {
while (ip < isize) {
simExecStep(false);
}
}
/*
辅助函数
*/
private int pow(int x, int p) {
return (int)Math.pow(x, p);
}
private int log2(int x) {
return (int)(Math.log(x) / Math.log(2));
}
private int random(int x, int y) {
return (int)Math.random() * (y - x) + x;
}
/*
绘制界面
*/
private void unifiedCacheEnabled(boolean enabled) {
unifiedCacheButton.setSelected(enabled);
csLabel.setEnabled(enabled);
csBox.setEnabled(enabled);
}
private void separateCacheEnabled(boolean enabled) {
separateCacheButton.setSelected(enabled);
icsLabel.setEnabled(enabled);
dcsLabel.setEnabled(enabled);
icsBox.setEnabled(enabled);
dcsBox.setEnabled(enabled);
}
private void draw() {
setLayout(new BorderLayout(5,5));
panelTop = new JPanel();
panelLeft = new JPanel();
panelRight = new JPanel();
panelBottom = new JPanel();
panelTop.setPreferredSize(new Dimension(800, 50));
panelLeft.setPreferredSize(new Dimension(300, 450));
panelRight.setPreferredSize(new Dimension(500, 450));
panelBottom.setPreferredSize(new Dimension(800, 100));
panelTop.setBorder(new EtchedBorder(EtchedBorder.RAISED));
panelLeft.setBorder(new EtchedBorder(EtchedBorder.RAISED));
panelRight.setBorder(new EtchedBorder(EtchedBorder.RAISED));
panelBottom.setBorder(new EtchedBorder(EtchedBorder.RAISED));
labelTop = new JLabel("Cache Simulator by JCGuo");
labelTop.setAlignmentX(CENTER_ALIGNMENT);
JLabel promptLabel = new JLabel(" (Notice! 如果修改了左侧Cache设置请重新加载流文件再运行！)");
promptLabel.setForeground(Color.red);
panelTop.add(labelTop);
panelTop.add(promptLabel);
labelLeft = new JLabel("Cache 参数设置");
labelLeft.setPreferredSize(new Dimension(300, 40));
csLabel = new JLabel("总大小");
csLabel.setPreferredSize(new Dimension(80, 30));
csBox = new JComboBox<String>(cachesize);
csBox.setPreferredSize(new Dimension(90, 30));
csBox.addItemListener(new ItemListener() {
public void itemStateChanged(ItemEvent e) {
csIndex = csBox.getSelectedIndex();
}
});
//cache 种类
unifiedCacheButton = new JRadioButton("统一Cache:", true);
unifiedCacheButton.setPreferredSize(new Dimension(100, 30));
unifiedCacheButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
separateCacheEnabled(false);
unifiedCacheEnabled(true);
cacheType = 0;
}
});
separateCacheButton = new JRadioButton("分离Cache:");
separateCacheButton.setPreferredSize(new Dimension(100, 30));
separateCacheButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
separateCacheEnabled(true);
unifiedCacheEnabled(false);
cacheType = 1;
}
});
icsLabel = new JLabel("指令Cache");
icsLabel.setPreferredSize(new Dimension(80, 30));
dcsLabel = new JLabel("数据Cache");
dcsLabel.setPreferredSize(new Dimension(80, 30));
JLabel emptyLabel = new JLabel("");
emptyLabel.setPreferredSize(new Dimension(100, 30));
icsBox = new JComboBox<String>(scachesize);
icsBox.setPreferredSize(new Dimension(90, 30));
icsBox.addItemListener(new ItemListener() {
public void itemStateChanged(ItemEvent e) {
icsIndex = icsBox.getSelectedIndex();
}
});
dcsBox = new JComboBox<String>(scachesize);
dcsBox.setPreferredSize(new Dimension(90, 30));
dcsBox.addItemListener(new ItemListener() {
public void itemStateChanged(ItemEvent e) {
dcsIndex = dcsBox.getSelectedIndex();
}
});
separateCacheEnabled(false);
unifiedCacheEnabled(true);
//cache 块大小设置
bsLabel = new JLabel("块大小");
bsLabel.setPreferredSize(new Dimension(120, 30));
bsBox = new JComboBox<String>(blocksize);
bsBox.setPreferredSize(new Dimension(160, 30));
bsBox.addItemListener(new ItemListener() {
public void itemStateChanged(ItemEvent e) {
bsIndex = bsBox.getSelectedIndex();
}
});
//相连度设置
wayLabel = new JLabel("相联度");
wayLabel.setPreferredSize(new Dimension(120, 30));
wayBox = new JComboBox<String>(way);
wayBox.setPreferredSize(new Dimension(160, 30));
wayBox.addItemListener(new ItemListener() {
public void itemStateChanged(ItemEvent e) {
wayIndex = wayBox.getSelectedIndex();
}
});
//替换策略设置
replaceLabel = new JLabel("替换策略");
replaceLabel.setPreferredSize(new Dimension(120, 30));
replaceBox = new JComboBox<String>(replace);
replaceBox.setPreferredSize(new Dimension(160, 30));
replaceBox.addItemListener(new ItemListener() {
public void itemStateChanged(ItemEvent e) {
replaceIndex = replaceBox.getSelectedIndex();
}
});
//欲取策略设置
prefetchLabel = new JLabel("预取策略");
prefetchLabel.setPreferredSize(new Dimension(120, 30));
prefetchBox = new JComboBox<String>(pref);
prefetchBox.setPreferredSize(new Dimension(160, 30));
prefetchBox.addItemListener(new ItemListener(){
public void itemStateChanged(ItemEvent e){
prefetchIndex = prefetchBox.getSelectedIndex();
}
});
//写策略设置
writeLabel = new JLabel("写策略");
writeLabel.setPreferredSize(new Dimension(120, 30));
writeBox = new JComboBox<String>(write);
writeBox.setPreferredSize(new Dimension(160, 30));
writeBox.addItemListener(new ItemListener() {
public void itemStateChanged(ItemEvent e) {
writeIndex = writeBox.getSelectedIndex();
}
});
//调块策略
allocLabel = new JLabel("写不命中调块策略");
allocLabel.setPreferredSize(new Dimension(120, 30));
allocBox = new JComboBox<String>(alloc);
allocBox.setPreferredSize(new Dimension(160, 30));
allocBox.addItemListener(new ItemListener() {
public void itemStateChanged(ItemEvent e) {
allocIndex = allocBox.getSelectedIndex();
}
});
//选择指令流文件
fileLabel = new JLabel("选择指令流文件");
fileLabel.setPreferredSize(new Dimension(120, 30));
fileAddrBtn = new JLabel();
fileAddrBtn.setPreferredSize(new Dimension(210,30));
fileAddrBtn.setBorder(new EtchedBorder(EtchedBorder.RAISED));
fileBotton = new JButton("浏览");
fileBotton.setPreferredSize(new Dimension(70,30));
fileBotton.addActionListener(this);
panelLeft.add(labelLeft);
panelLeft.add(unifiedCacheButton);
panelLeft.add(csLabel);
panelLeft.add(csBox);
panelLeft.add(separateCacheButton);
panelLeft.add(icsLabel);
panelLeft.add(icsBox);
panelLeft.add(emptyLabel);
panelLeft.add(dcsLabel);
panelLeft.add(dcsBox);
panelLeft.add(bsLabel);
panelLeft.add(bsBox);
panelLeft.add(wayLabel);
panelLeft.add(wayBox);
panelLeft.add(replaceLabel);
panelLeft.add(replaceBox);
panelLeft.add(prefetchLabel);
panelLeft.add(prefetchBox);
panelLeft.add(writeLabel);
panelLeft.add(writeBox);
panelLeft.add(allocLabel);
panelLeft.add(allocBox);
panelLeft.add(fileLabel);
panelLeft.add(fileAddrBtn);
panelLeft.add(fileBotton);
//*****************************右侧面板绘制*****************************************//
//模拟结果展示区域
rightLabel = new JLabel("模拟结果");
rightLabel.setPreferredSize(new Dimension(500, 40));
panelRight.add(rightLabel);
resultTagLabel = new JLabel[4][3];
resultDataLabel = new JLabel[4][3];
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 3; j++) {
resultTagLabel[i][j] = new JLabel(resultTags[i][j]);
resultTagLabel[i][j].setPreferredSize(new Dimension(70, 40));
if (j != 2) {
resultDataLabel[i][j] = new JLabel("0");
} else {
resultDataLabel[i][j] = new JLabel("0.00%");
}
resultDataLabel[i][j].setPreferredSize(new Dimension(83, 40));
panelRight.add(resultTagLabel[i][j]);
panelRight.add(resultDataLabel[i][j]);
}
if (i == 0) {
JLabel label = new JLabel("其中:");
label.setPreferredSize(new Dimension(500, 40));
panelRight.add(label);
}
}
/*
stepLabel1 = new JLabel();
stepLabel1.setVisible(false);
stepLabel1.setPreferredSize(new Dimension(500, 40));
stepLabel2 = new JLabel();
stepLabel2.setVisible(false);
stepLabel2.setPreferredSize(new Dimension(500, 40));
panelRight.add(stepLabel1);
panelRight.add(stepLabel2);
*/
accessTypeTagLabel = new JLabel("访问类型:");
addressTagLabel = new JLabel("地址:");
blockNumberTagLabel = new JLabel("块号:");
tagTagLabel = new JLabel("标记Tag:");
indexTagLabel = new JLabel("组索引:");
inblockAddressTagLabel = new JLabel("块内地址:");
hitTagLabel = new JLabel("命中情况:");
accessTypeDataLabel = new JLabel("--");
addressDataLabel = new JLabel("--");
blockNumberDataLabel = new JLabel("--");
tagDataLabel = new JLabel("--");
indexDataLabel = new JLabel("--");
inblockAddressDataLabel = new JLabel("--");
hitDataLabel = new JLabel("--");
accessTypeTagLabel.setPreferredSize(new Dimension(80, 40));
accessTypeDataLabel.setPreferredSize(new Dimension(80, 40));
addressTagLabel.setPreferredSize(new Dimension(80, 40));
addressDataLabel.setPreferredSize(new Dimension(200, 40));
panelRight.add(accessTypeTagLabel);
panelRight.add(accessTypeDataLabel);
panelRight.add(addressTagLabel);
panelRight.add(addressDataLabel);
blockNumberTagLabel.setPreferredSize(new Dimension(80, 40));
blockNumberDataLabel.setPreferredSize(new Dimension(200, 40));
hitTagLabel.setPreferredSize(new Dimension(80, 40));
hitDataLabel.setPreferredSize(new Dimension(80, 40));
panelRight.add(blockNumberTagLabel);
panelRight.add(blockNumberDataLabel);
panelRight.add(hitTagLabel);
panelRight.add(hitDataLabel);
tagTagLabel.setPreferredSize(new Dimension(60, 40));
tagDataLabel.setPreferredSize(new Dimension(70, 40));
indexTagLabel.setPreferredSize(new Dimension(60, 40));
indexDataLabel.setPreferredSize(new Dimension(70, 40));
inblockAddressTagLabel.setPreferredSize(new Dimension(60, 40));
inblockAddressDataLabel.setPreferredSize(new Dimension(100, 40));
panelRight.add(tagTagLabel);
panelRight.add(tagDataLabel);
panelRight.add(indexTagLabel);
panelRight.add(indexDataLabel);
panelRight.add(inblockAddressTagLabel);
panelRight.add(inblockAddressDataLabel);
//*****************************底部面板绘制*****************************************//
bottomLabel = new JLabel("执行控制");
bottomLabel.setPreferredSize(new Dimension(800, 30));
execStepBtn = new JButton("步进");
execStepBtn.setLocation(100, 30);
execStepBtn.addActionListener(this);
execAllBtn = new JButton("执行到底");
execAllBtn.setLocation(300, 30);
execAllBtn.addActionListener(this);
panelBottom.add(bottomLabel);
panelBottom.add(execStepBtn);
panelBottom.add(execAllBtn);
add("North", panelTop);
add("West", panelLeft);
add("Center", panelRight);
add("South", panelBottom);
setSize(820, 620);
setVisible(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new MyCacheSim();
}
}
原文：http://blog.csdn.net/u014030117/article/details/45585881
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