private static int Otimo(MemoryProcess process)
{
int index = 0, aux = 0, changesAmount = 0, pageHigherTime = 0, indexPageHigherTime = 0;
//Página nova
for (int i = 0; i < process.Pages.Count; ++i)
{
int currentPage = process.Pages[i];
if (!process.Frames.Contains(currentPage) && (index < process.AmountOfFrames))
{
process.Frames.Insert(index, currentPage);
++index;
++aux;
++changesAmount;
}
else if (process.Frames.Contains(currentPage)) //Página repetida
{
++aux;
}
else //Moldura preenchida
{
pageHigherTime = GetHigherTime(process, aux);
indexPageHigherTime = process.Frames.IndexOf(pageHigherTime);
process.Frames.RemoveAt(indexPageHigherTime);
process.Frames.Insert(indexPageHigherTime, currentPage);
++aux;
++changesAmount;
}
}
return(changesAmount);
}
private static int NFU(MemoryProcess process)
{
int index = 0, changesAmount = 0, indexInFrame = 0, lessUsed = 0;
int[] pagesAccess = new int[process.AmountOfPages];
for (int i = 0; i < process.Pages.Count; ++i)
{
int currentPage = process.Pages[i];
//Página nova
if (!process.Frames.Contains(currentPage) && (index < process.AmountOfFrames))
{
process.Frames.Insert(index, currentPage);
++pagesAccess[currentPage - 1];
++index;
++changesAmount;
}
else if (process.Frames.Contains(currentPage)) //Página repetida
{
++pagesAccess[currentPage - 1];
}
else //Verificar trocas, moldura preenchida
{
lessUsed = GetNFU(process.Frames, pagesAccess);
indexInFrame = process.Frames.IndexOf(lessUsed);
process.Frames.RemoveAt(indexInFrame);
process.Frames.Insert(indexInFrame, currentPage);
pagesAccess[lessUsed - 1] = 0;
++pagesAccess[currentPage - 1];
++changesAmount;
}
}
return(changesAmount);
}
private static int MRU(MemoryProcess process)
{
//Para molduras que ainda não tem preenchimento
int index = 0, aux = 0;
//Moldura cheia
int high = 0;
int changesAmount = 0;
//Tempo ocioso para cada posição
int[] pos = new int[process.AmountOfFrames];
for (int i = 0; i < process.Pages.Count; ++i)
{
int currentPage = process.Pages[i];
//Página nova
if (!process.Frames.Contains(currentPage) && (aux < process.AmountOfFrames))
{
process.Frames.Insert(index, currentPage);
++aux;
IncreaseTime(aux, pos);
pos[index] = 0;
++index;
++changesAmount;
}
else if (process.Frames.Contains(currentPage)) //Página repetida
{
IncreaseTime(aux, pos);
pos[process.Frames.IndexOf(currentPage)] = 0;
}
else
{
high = GetIndexMRU(pos);
process.Frames.RemoveAt(high);
process.Frames.Insert(high, currentPage);
IncreaseTime(aux, pos);
pos[high] = 0;
++index;
++changesAmount;
}
}
return(changesAmount);
}
//Função auxiliar para Ótimo
//Encontra página que vai levar mais tempo
private static int GetHigherTime(MemoryProcess process, int start)
{
int time = 0;
Dictionary <int, int> dict = new Dictionary <int, int>();
for (int i = 0; i < process.Frames.Count; ++i)
{
int currentFrame = process.Frames[i];
for (int j = 0; j < process.Pages.Count; ++j)
{
++time;
if (currentFrame == process.Pages[i])
{
break;
}
}
dict.Add(currentFrame, time);
time = 0;
}
return(dict.Aggregate((x, y) => x.Value > y.Value ? x : y).Key);
}
//Algoritmos
private static int FIFO(MemoryProcess process)
{
int auxIn = 0, changesAmount = 0, index = 0;
for (int i = 0; i < process.Pages.Count; ++i)
{
int currentPage = process.Pages[i];
//Se não conter a página atual na moldura, adiciona e incrementa indice
if (process.Frames.Count < process.AmountOfFrames && !process.Frames.Contains(currentPage))
{
process.Frames.Insert(index, currentPage);
++index;
++changesAmount;
}
else if (process.Frames.Contains(currentPage)) //Se conter a página na moldura atual, apenas continua
{
continue;
}
else
{
//Aplicando a lógica do primeiro que entrar, sair
process.Frames.RemoveAt(auxIn);
//Adiciona página atual na posição antiga do primeiro que entrou para ser o novo parametro
process.Frames.Insert(auxIn, currentPage);
++auxIn;
index = 0;
++changesAmount;
}
//Caso o indice do elemento para remover seja a capacidade da lista, volta pro começo
if (auxIn == process.AmountOfFrames)
{
auxIn = 0;
}
}
return(changesAmount);
}
//Função que abre o arquivo, lê linha a linha e cria os processos conforme definido, retornando a lista de processos
public static List <MemoryProcess> GetAndListProcesses(string filename)
{
List <MemoryProcess> list = new List <MemoryProcess>();
try {
StreamReader reader = new StreamReader(filename);
string[] allLines = reader.ReadToEnd().Split('\n');
if (allLines != null)
{
foreach (string line in allLines)
{
//Número de molduras de página na memória|número de páginas do processo|sequência em que as páginas são acessadas
string[] info = line.Split('|');
MemoryProcess mp = new MemoryProcess(Convert.ToInt32(info[0]), Convert.ToInt32(info[1]), info[2].Replace("\r", ""));
list.Add(mp);
}
}
reader.Close();
}
catch (IOException ex) {
Console.WriteLine(ex.Message);
}
return(list);
}
public static void Main(string[] args)
{
List <MemoryProcess> processes = FileManipulation.GetAndListProcesses(@"C:\dev\furg\memorypagination\processes.txt");
PrintProcesses(processes);
int[] changesAmount = new int[4];
int min = 0;
string betterAlg = string.Empty;
bool simpleOutput = true;
for (int i = 0; i < processes.Count; ++i)
{
MemoryProcess currentProcess = processes[i];
changesAmount[0] = FIFO(currentProcess);
currentProcess.Frames.Clear();
changesAmount[1] = MRU(currentProcess);
currentProcess.Frames.Clear();
changesAmount[2] = NFU(currentProcess);
currentProcess.Frames.Clear();
changesAmount[3] = Otimo(currentProcess);
currentProcess.Frames.Clear();
min = changesAmount.Min();
for (int j = 0; j < changesAmount.Length; ++j)
{
if (changesAmount[j] == min)
{
switch (j)
{
case 0:
betterAlg += "FIFO,";
break;
case 1:
betterAlg += "MRU,";
break;
case 2:
betterAlg += "NUF,";
break;
case 3:
betterAlg += "Otimo,";
break;
}
}
}
betterAlg = betterAlg.Substring(0, betterAlg.Length - 1); //Remove última virgula
if (simpleOutput)
{
string aux = betterAlg;
if (betterAlg.Equals("FIFO,MRU,NUF,Otimo"))
{
aux = "Empate";
}
Console.WriteLine(string.Format("{0}|{1}|{2}|{3}|{4}", changesAmount[0], changesAmount[1], changesAmount[2], changesAmount[3], aux));
}
else
{
Console.WriteLine(string.Format("Avaliação dos algoritmos (por trocas):\n--> FIFO [{0}]\n--> MRU [{1}]\n--> NFU [{2}]\n--> Ótimo [{3}]\n--> Melhor(es): [{4}]", changesAmount[0], changesAmount[1], changesAmount[2], changesAmount[3], betterAlg));
}
betterAlg = string.Empty;
}
Console.WriteLine("Fim");
}
