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Worst Fit Program In Java
Worst Fit Program in Java
Processes in an operating system are allocated memory during their processing time in the CPU. The processes demand memory locations to the processor which allocates memory based on the size of the process. The three most commonly used memory allocation schemes are Best fit, worst fit, and first fit.
Processes in an operating system are allocated memory during their processing time in the CPU. The processes demand memory locations to the processor which allocates memory based on the size of the process. The three most commonly used memory allocation schemes are Best fit, worst fit, and first fit.
- Read Also – Worst Fit Algorithm in python
In the case of worst fit memory allocation scheme, the processor assigns any random free memory block which is greater than the memory demanded by the process. In this case, there is a probability of maximum memory wastage as the processor assigns any free memory block randomly to the demanding process. Therefore, this memory allocation scheme is also known as the worst fit.
Program code for Worst Fit Memory management Scheme
public class PrepInsta { //Function to allocate memory to empty blocks based on the worst fit algorithm. static void WorstFit(int b_size[], int m, int p_size[], int n) { //stores block id of the block which is allocated to a process Int allocate[] = new int[n]; // no block is assigned to a process initially for ( int I =0; i< allocate.length++) allocate[i] =-1; //select each process and find suitable blocks as per its size //block assignment is also done here for (int i=0; i<n; i++) { // determine the first fit block for the current process Int wstIdx = -1; for (int j=0; j<m; j++) { if (b_Size[j] >= p_Size[i]) { if (wstIdx == -1) wstIdx = j; else if (b_Size[wstIdx] < b_Size[j]) wstIdx = j; } } // searching an empty memory block for the current process if (wstIdx != -1) { // assigning memory block j to the process p[i] allocate[i] = wstIdx; // Reduce available memory in this block. b_Size[wstIdx] -= p_Size[i]; } } System.out.println ("\nProcess Number \tProcess Size\tBlock Number "); 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 code public static void main(String[] args) { int b_Size[] = {100, 500, 200, 300, 600}; int p_Size[] = {212, 417, 112, 426}; int m = b_Size.length; int n = p_Size.length; worstFit(b_Size, m, p_Size, n); } }
Output
[table id=678 /]
Read More
- Memory Management Introduction
- Partition Allocation Method
- Buddy- System Allocator
- Paging
- Types of Paging
- Fragmentation
- Mapping Virtual address to Physical Address.
- Virtual Memory
- Demand Paging
- Implementation of Demand paging and page fault
- Segmentation
- Page Replacement Algorithms
- Thrashing
- Belady’s Anomaly
- Static vs Dynamic Loading
- Static vs Dynamic Linking
- Swapping
- Translational Look Aside Buffer
- Process Address Space
- Difference between Segmentation and Paging
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