Requisito previo: los métodos de asignación de particiones
Worst Fit asignan un proceso a la partición que es lo suficientemente grande entre las particiones disponibles gratuitamente en la memoria principal. Si un proceso grande llega en una etapa posterior, la memoria no tendrá espacio para acomodarlo.
Ejemplo:
C++
// C++ implementation of worst - Fit algorithm
#include<bits/stdc++.h>
using namespace std;
// Function to allocate memory to blocks as per worst fit
// algorithm
void worstFit(int blockSize[], int m, int processSize[],
int n)
{
// Stores block id of the block allocated to a
// process
int allocation[n];
// Initially no block is assigned to any process
memset(allocation, -1, sizeof(allocation));
// pick each process and find suitable blocks
// according to its size ad assign to it
for (int i=0; i<n; i++)
{
// Find the best fit block for current process
int wstIdx = -1;
for (int j=0; j<m; j++)
{
if (blockSize[j] >= processSize[i])
{
if (wstIdx == -1)
wstIdx = j;
else if (blockSize[wstIdx] < blockSize[j])
wstIdx = j;
}
}
// If we could find a block for current process
if (wstIdx != -1)
{
// allocate block j to p[i] process
allocation[i] = wstIdx;
// Reduce available memory in this block.
blockSize[wstIdx] -= processSize[i];
}
}
cout << "\nProcess No.\tProcess Size\tBlock no.\n";
for (int i = 0; i < n; i++)
{
cout << " " << i+1 << "\t\t" << processSize[i] << "\t\t";
if (allocation[i] != -1)
cout << allocation[i] + 1;
else
cout << "Not Allocated";
cout << endl;
}
}
// Driver code
int main()
{
int blockSize[] = {100, 500, 200, 300, 600};
int processSize[] = {212, 417, 112, 426};
int m = sizeof(blockSize)/sizeof(blockSize[0]);
int n = sizeof(processSize)/sizeof(processSize[0]);
worstFit(blockSize, m, processSize, n);
return 0 ;
}
Java
// Java implementation of worst - Fit algorithm
public class GFG
{
// Method to allocate memory to blocks as per worst fit
// algorithm
static void worstFit(int blockSize[], int m, int processSize[],
int n)
{
// Stores block id of the block allocated to a
// process
int allocation[] = new int[n];
// Initially no block is assigned to any process
for (int i = 0; i < allocation.length; i++)
allocation[i] = -1;
// pick each process and find suitable blocks
// according to its size ad assign to it
for (int i=0; i<n; i++)
{
// Find the best fit block for current process
int wstIdx = -1;
for (int j=0; j<m; j++)
{
if (blockSize[j] >= processSize[i])
{
if (wstIdx == -1)
wstIdx = j;
else if (blockSize[wstIdx] < blockSize[j])
wstIdx = j;
}
}
// If we could find a block for current process
if (wstIdx != -1)
{
// allocate block j to p[i] process
allocation[i] = wstIdx;
// Reduce available memory in this block.
blockSize[wstIdx] -= processSize[i];
}
}
System.out.println("\nProcess No.\tProcess Size\tBlock no.");
for (int i = 0; i < n; i++)
{
System.out.print(" " + (i+1) + "\t\t" + processSize[i] + "\t\t");
if (allocation[i] != -1)
System.out.print(allocation[i] + 1);
else
System.out.print("Not Allocated");
System.out.println();
}
}
// Driver Method
public static void main(String[] args)
{
int blockSize[] = {100, 500, 200, 300, 600};
int processSize[] = {212, 417, 112, 426};
int m = blockSize.length;
int n = processSize.length;
worstFit(blockSize, m, processSize, n);
}
}
Python3
# Python3 implementation of worst - Fit algorithm
# Function to allocate memory to blocks as
# per worst fit algorithm
def worstFit(blockSize, m, processSize, n):
# Stores block id of the block
# allocated to a process
# Initially no block is assigned
# to any process
allocation = [-1] * n
# pick each process and find suitable blocks
# according to its size ad assign to it
for i in range(n):
# Find the best fit block for
# current process
wstIdx = -1
for j in range(m):
if blockSize[j] >= processSize[i]:
if wstIdx == -1:
wstIdx = j
elif blockSize[wstIdx] < blockSize[j]:
wstIdx = j
# If we could find a block for
# current process
if wstIdx != -1:
# allocate block j to p[i] process
allocation[i] = wstIdx
# Reduce available memory in this block.
blockSize[wstIdx] -= processSize[i]
print("Process No. Process Size Block no.")
for i in range(n):
print(i + 1, " ",
processSize[i], end = " ")
if allocation[i] != -1:
print(allocation[i] + 1)
else:
print("Not Allocated")
# Driver code
if __name__ == '__main__':
blockSize = [100, 500, 200, 300, 600]
processSize = [212, 417, 112, 426]
m = len(blockSize)
n = len(processSize)
worstFit(blockSize, m, processSize, n)
# This code is contributed by PranchalK
C#
// C# implementation of worst - Fit algorithm
using System;
class GFG
{
// Method to allocate memory to blocks
// as per worst fit algorithm
static void worstFit(int []blockSize, int m,
int []processSize, int n)
{
// Stores block id of the block allocated to a
// process
int []allocation = new int[n];
// Initially no block is assigned to any process
for (int i = 0; i < allocation.Length; i++)
allocation[i] = -1;
// pick each process and find suitable blocks
// according to its size ad assign to it
for (int i = 0; i < n; i++)
{
// Find the best fit block for current process
int wstIdx = -1;
for (int j = 0; j < m; j++)
{
if (blockSize[j] >= processSize[i])
{
if (wstIdx == -1)
wstIdx = j;
else if (blockSize[wstIdx] < blockSize[j])
wstIdx = j;
}
}
// If we could find a block for current process
if (wstIdx != -1)
{
// allocate block j to p[i] process
allocation[i] = wstIdx;
// Reduce available memory in this block.
blockSize[wstIdx] -= processSize[i];
}
}
Console.WriteLine("\nProcess No.\tProcess Size\tBlock no.");
for (int i = 0; i < n; i++)
{
Console.Write(" " + (i+1) + "\t\t\t" + processSize[i] + "\t\t\t");
if (allocation[i] != -1)
Console.Write(allocation[i] + 1);
else
Console.Write("Not Allocated");
Console.WriteLine();
}
}
// Driver code
public static void Main(String[] args)
{
int []blockSize = {100, 500, 200, 300, 600};
int []processSize = {212, 417, 112, 426};
int m = blockSize.Length;
int n = processSize.Length;
worstFit(blockSize, m, processSize, n);
}
}
// This code has been contributed by 29AjayKumar
Javascript
<script>
// Javascript implementation of
// worst - Fit algorithm
// Method to allocate memory to
// blocks as per worst fit
// algorithm
function worstFit(blockSize, m,
processSize, n)
{
// Stores block id of the block allocated
// to a process
let allocation = new Array(n);
// Initially no block is assigned
// to any process
for(let i = 0; i < allocation.length; i++)
allocation[i] = -1;
// Pick each process and find suitable blocks
// according to its size ad assign to it
for(let i = 0; i < n; i++)
{
// Find the best fit block
// for current process
let wstIdx = -1;
for(let j = 0; j < m; j++)
{
if (blockSize[j] >= processSize[i])
{
if (wstIdx == -1)
wstIdx = j;
else if (blockSize[wstIdx] <
blockSize[j])
wstIdx = j;
}
}
// If we could find a block for
// current process
if (wstIdx != -1)
{
// Allocate block j to p[i] process
allocation[i] = wstIdx;
// Reduce available memory in this block.
blockSize[wstIdx] -= processSize[i];
}
}
document.write("<br>Process No. " +
" Process Size " +
" Block no.<br>");
for(let i = 0; i < n; i++)
{
document.write(" " + (i + 1) +
" " +
" " +
processSize[i] +
" ");
if (allocation[i] != -1)
document.write(allocation[i] + 1);
else
document.write("Not Allocated");
document.write("<br>");
}
}
// Driver code
let blockSize = [ 100, 500, 200, 300, 600 ];
let processSize = [ 212, 417, 112, 426 ];
let m = blockSize.length;
let n = processSize.length;
worstFit(blockSize, m, processSize, n);
// This code is contributed by rag2127
</script>
Publicación traducida automáticamente
Artículo escrito por GeeksforGeeks-1 y traducido por Barcelona Geeks. The original can be accessed here. Licence: CCBY-SA