#include<iostream>
#include<fstream>
#include<cstdlib>
using namespace std;
int lru[500][20];
//Function to change the tag order in the lru algo
int bringtotop(int set, int assoc, int x)
{
int i,pos;
for(i=0;i<assoc;i++)
if(lru[set][i] == x)
pos = i;
for(i=pos;i<assoc-1;i++)
lru[set][i] = lru[set][i+1];
lru[set][assoc-1] = x;
}
void plot(int total, int hit, int miss);
long int changebase(char hex[], int base);
int convert(char);
int main()
{
int cache_size, asso, block_size,i,j, no_blocks, base,r,alg, x,pos;
long int address;
float hitrate;
char hex[20], filename[20];
int no_set;
int check=0, hit=0, miss=0;
cout<<"Enter the cache_size : ";
cin>>cache_size;
cout<<"Enter the associativity : ";
cin>>asso;
cout<<"Enter the block size : ";
cin>>block_size;
cout<<"Enter trace filename : ";
cin>>filename;
cout<<"Enter the base of number in trace file : ";
cin>>base;
cout<<"1. FIFO 2.LRU 3. Random...Enter Your Choice : ";
cin>>alg;
no_blocks = cache_size / block_size;
no_set = cache_size / (asso * block_size);
int cache[no_set][asso];
for(i=0;i<no_set;i++)
for(j=0;j<asso;j++)
cache[i][j] = -10; // Eliminating all garbage values in in the cache...
int fifo[no_set];
for(i=0;i<no_set;i++)
fifo[i] = 0;
for(i=0;i<no_set;i++)
for(j=0;j<asso;j++)
lru[i][j] = j;
ifstream infile;
infile.open(filename,ios::in);
if(!infile)
{
cout<<"Error! File not found...";
exit(0);
}
int set, tag, found;
while(!infile.eof()) //Reading each address from trace file
{
if(base!=10)
{
infile>>hex;
address = changebase(hex, base);
}
else
infile>>address;
set = (address / block_size) % no_set;
tag = address / (block_size * no_set);
check++;
found = 0;
for(i=0;i<asso;i++)
if(cache[set][i] == tag)
{
found = 1;
pos = i;
}
if(found)
{
hit++;
if(alg == 2)
{
bringtotop(set,asso,pos);
}
}
else
{
if(alg==1)
{
i = fifo[set];
cache[set][i] = tag;
fifo[set]++;
if(fifo[set] == asso)
fifo[set] = 0;
}
else if(alg==2)
{
i = lru[set][0];
cache[set][i] = tag;
bringtotop(set,asso,i);
}
else
{
r = rand() % asso;
cache[set][r] = tag;
}
}
}
infile.close();
system("clear");
cout<<"No: of checks : "<<check;
cout<<" No: of hits : "<<hit;
cout<<" No of misses : "<<check-hit;
hitrate = float(hit)/float(check);
cout<<" Hit Rate : "<<hitrate;
plot(check,hit, check-hit);
return 0;
}
int convert(char c)
{
if(c == '1')
return 1;
else if(c == '2')
return 2;
else if(c == '3')
return 3;
else if(c == '4')
return 4;
else if(c =='5')
return 5;
else if(c == '6')
return 6;
else if(c == '7')
return 7;
else if(c == '8')
return 8;
else if(c == '9')
return 9;
else if(c == '0')
return 0;
else if( (c == 'a') || (c == 'A') )
return 10;
else if( (c == 'b') || (c == 'B') )
return 11;
else if( (c == 'c') || (c == 'C') )
return 12;
else if( (c == 'd') || (c == 'D') )
return 13;
else if( (c == 'e') || (c == 'E') )
return 14;
else if( (c == 'f') || (c == 'F') )
return 15;
else
return 0;
}
//Function to change the base of a number system to decimal
long int changebase(char hex[], int base)
{
int pow = 1,len,i,j;
char temp;
long int dec;
for(len=0;hex[len]!='\0';len++);
for(i=0,j=(len-1);i<j;i++,j--)
{
temp = hex[i];
hex[i]=hex[j];
hex[j]=temp;
}
pow = 1;
dec = 0;
for(i=0;i<len;i++)
{
if(convert(hex[i]== -1))
{
dec =0;
break;
}
dec = dec + (pow * convert(hex[i]));
pow*=base;
}
return dec;
}
//Function to plot a graph...
void plot(int total, int hit, int miss)
{
cout<<"\n\n ************Graph**********\n\n";
int hit_limit,miss_limit, i;
hit_limit = (float (hit)/total)*30;
miss_limit = (float(miss)/total)*30;
cout<<"\n\t^";
cout<<"\n\t|\n";
for(i=30;i>=0;i--)
{
cout<<"\t";
cout<<"|";
cout<<"\t\t";
//Total hit bar
cout<<"|";
if(i==30)
cout<<"----";
else
cout<<" ";
cout<<"|";
cout<<"\t\t";
//Hit Bar...
if(i<=hit_limit)
cout<<"|";
else
cout<<" ";
if(i==hit_limit)
cout<<"----";
else
cout<<" ";
if(i<=hit_limit)
cout<<"|";
else
cout<<" ";
cout<<"\t\t";
//Miss Bar...
if(i<=miss_limit)
cout<<"|";
else
cout<<" ";
if(i==miss_limit)
cout<<"----";
else
cout<<" ";
if(i<=miss_limit)
cout<<"|";
else
cout<<" ";
cout<<"\n";
}
cout<<"\t------------------------------------------------------------------------------>";
cout<<"\n\t\t\tTotal\t\t Hits\t\tMiss\n";
}
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