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Code Issues Releases Wiki Activity

-Added more testing code for best fit

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This commit is contained in:
David Weber 2012-11-17 05:07:03 -05:00
parent f0213a37a4
commit afc1ffcf54
3 changed files with 92 additions and 33 deletions
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105
BestFitAlgorithm.java
View File

@ -4,31 +4,36 @@
* 11/9/2012
*/
import java.lang.reflect.Method;
import java.util.ArrayList;
public class BestFitAlgorithm implements baseAlgorithm{
int memoryBlock[];
private Job[] jobArray = new Job[memoryManagement.JOBAMOUNT+10];
ArrayList<Integer> candidates;
public BestFitAlgorithm(int memorySize)
{
//Initialize memory block to whatever the size is
memoryBlock = new int[memorySize];
System.out.println("The size of the memory is: " + memoryBlock.length);
}
public int getBestSizeIndex(int jobSize)
{
int bestSize;
int bestSizeIndex;
int bestSize; //The most suitable block size for the job
int bestSizeIndex; //The most suitable block size starting index for the job
ArrayList<Integer> candidates = new ArrayList<Integer>(); //Dynamically resizable array list for allocation candidates (interleaved with index and memory size)
System.out.println("The size of the job is: " + jobSize);
candidates = new ArrayList<Integer>(); //Dynamically resizable array list for allocation candidates (interleaved with index and memory size)
int counter = 0; //Counter for measuring unallocated memory
//Scan through memory block and get free blocks
//Scan through memory block and get free blocks. Add candidates for allocation to array list
for(int i = 0; i < memoryBlock.length; i++)
{
//If position in memory block here is 0, iterate from that index and count up sequential 0's
//If position in memory block here is 0, iterate from that index and count up sequential 0's (free space)
if(memoryBlock[i] == 0)
{
for(int j = i; j < memoryBlock.length - i; j++)
@ -38,17 +43,28 @@ public class BestFitAlgorithm implements baseAlgorithm{
counter++;
}
}
if(counter >= jobSize)
if(counter == jobSize)
{
candidates.add(i); //Store index
candidates.add(counter); //Store size of free memory chunk
}
else if(counter >= jobSize)
{
candidates.add(i); //Store index
candidates.add(counter); //Store size of free memory chunk
}
//System.out.println("The size of the counter is: " + counter);
counter = 0;
}
}
for(int i = 0; i < candidates.size(); i++)
{
System.out.println("Candidate index: " + candidates.get(i));
System.out.println("Candidate size: " + candidates.get(i+1));
}
//Iterate through candidate sizes
bestSizeIndex = 0; //Initialize best index to first spot in array list
bestSizeIndex = candidates.get(0).intValue(); //Initialize best index to first spot in array list
bestSize = candidates.get(1).intValue(); //Initialize bestSize to first space size in candidate
@ -59,6 +75,7 @@ public class BestFitAlgorithm implements baseAlgorithm{
if(candidates.get(i).intValue() == jobSize)
{
bestSizeIndex = i - 1;
System.out.println("The best size index is: " + bestSizeIndex);
return bestSizeIndex; //You're done. Return the value.
}
//If the current size is less than the previous best size, make this the new best size
@ -66,12 +83,15 @@ public class BestFitAlgorithm implements baseAlgorithm{
{
bestSize = candidates.get(i+1).intValue();
bestSizeIndex = i - 1;
System.out.println("The best size index is: " + bestSizeIndex);
}
}
System.out.println("The best size is: " + bestSize);
//If the best size is less than the job size, run this again
//No candidates
if(candidates.isEmpty())
{
System.out.println("No best size index");
return -1;
}
@ -81,28 +101,55 @@ public class BestFitAlgorithm implements baseAlgorithm{
@Override
public void allocate(int jobID, int jobSize, int jobTime)
{
int bestSizeIndex = getBestSizeIndex(jobSize);
try
{
Method deallocateMethod = this.getClass().getMethod("deallocate", new Class[]{int.class, int.class});
//checks to see if the job will fit in memory
if(jobSize>memoryBlock.length)
{
System.out.println("This job is too large");
System.exit(0);
}
int bestSizeIndex = getBestSizeIndex(jobSize);
//No candidates found
if(bestSizeIndex == -1)
{
System.out.println("No candidates found...attempting to compact");
//Try compacting, then attempt to get an index again
compact();
bestSizeIndex = getBestSizeIndex(jobSize);
//Compacting still didn't produce an appropriate block
if(bestSizeIndex == -1)
{
//TODO .....
}
}
else
{
//Allocate the memory
for(int i = bestSizeIndex; i < jobSize; i++)
{
memoryBlock[i] = jobID;
}
System.out.println("Successfully allocated!");
for(int i = 0; i < memoryBlock.length; i++)
{
System.out.println("Job at position " + i + "in memoryblock: " + memoryBlock[i]);
}
}
}
//No candidates found
if(bestSizeIndex == -1)
catch (Exception e)
{
//Try compacting, then attempt to get an index again
compact();
bestSizeIndex = getBestSizeIndex(jobSize);
//Compacting still didn't produce an appropriate block
if(bestSizeIndex == -1)
{
//TODO .....
}
}
else
{
//Allocate the memory
for(int i = bestSizeIndex; i < jobSize; i++)
{
memoryBlock[i] = jobID;
}
System.out.println("Could not allocate job with ID " + jobID);
}
}

2
FirstFit.java
View File

@ -60,7 +60,7 @@ class FirstFit implements baseAlgorithm
if(jobSize>memSize)
{
System.out.println("\n\n*********************************************************"+
" THIS JOB IS TO LARGE TO FIT INTO MEMORY"+
" THIS JOB IS TOO LARGE TO FIT INTO MEMORY"+
"*********************************************************");
System.exit(0);
}

18
memoryManagement.java
View File

@ -70,6 +70,9 @@ public class memoryManagement{
System.out.println("complete");
System.out.println(jobLength+" jobs found on file");
}
//Send jobs to algorithm, time is calculated and printed out after completion
System.out.print("Sending jobs to threaded allocation algorithm...");
@ -82,17 +85,25 @@ public class memoryManagement{
}
timeEnd = System.currentTimeMillis() - timeStart;
System.out.println("complete");
System.out.println("Elapsed time for threaded allocation algorithm to complete " + jobLength +
" jobs is " + timeEnd + " milliseconds");
System.out.println("Elapsed time for threaded allocation algorithm to complete " + jobLength +
" jobs is " + timeEnd + " milliseconds");
//***Best Fit (David Weber)***
timeStart = System.currentTimeMillis();
for(int i = 0; i < jobLength - 1; i++){
//David_Weber_BestFit.allocate(id[i], size[i], time[i]);
David_Weber_BestFit.allocate(id[i], size[i], time[i]);
}
timeEnd = System.currentTimeMillis() - timeStart;
System.out.println("complete");
System.out.println("Elapsed time for threaded best fit allocation algorithm to complete " + jobLength + " jobs is " + timeEnd + " milliseconds");
/*
//***Worst Fit (David Weber)***
timeStart = System.currentTimeMillis();
for(int i = 0; i < jobLength - 1; i++){
@ -101,6 +112,7 @@ public class memoryManagement{
timeEnd = System.currentTimeMillis() - timeStart;
System.out.println("complete");
System.out.println("Elapsed time for threaded worst fit allocation algorithm to complete " + jobLength + " jobs is " + timeEnd + " milliseconds");
*/
//Put other algorithms here.