Most systems allow programs to allocate more memory to its address space during execution. Data allocated in the heap segments of programs is an example of such allocated memory. What is required to support dynamic memory allocation in the following schemes: a. contiguous-memory allocation b. pure segmentation c. pure paging

Most systems allow programs to allocate more memory to its address space during execution. Data allocated in the heap segments of programs is an example of such allocated memory. What is required to support dynamic memory allocation in the following schemes: a. contiguous-memory allocation b. pure segmentation c. pure paging

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Paging is a memory management scheme that eliminates the need for contiguous allocation of physical memory. This scheme permits the physical address space of a process to be non – contiguous. Given below is one of the page replacement algorithm program, you are to first identify which algorithm (FIFO, Optimal Page Replacement, Least frequently used) is implemented in given c-code. Please consider following reference string for this page replacement algorithm (1,2,3 5,1,3,4,5,6,1,5,3,2) with 4 page/frame size. There are some errors in this program, you have to correct it first, and then explain compiled output with each miss or hit condition. Note: Show complete procedure with detail steps/screenshots with your arid number. #include <stdio.h> void main() { int pos,c,m,maxi,i,k,nf,count,j=0,pf=0,np=0; printf("enter no. of pages"); scanf("%d",&np); int s[np]; printf("Enter pages sequence :\n");…
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Assume we have a free space management system as described in the book, for example one used to provide us with virtual addresses on the heap (with physical addresses handled by a much simpler system since we assume paging). Assume the system uses the following very simple rules; A memory request traverses the free list, and finds the first block large enough to handle the request (i.e., the first fit algorithm from the book). It then: Splits the block into 2 pieces: The first piece will be the requested size + 1k (for a header). The second will be the remaining The first piece will be returned to the caller, but the address returned will be the address of the memory for the user, that is the header + 1k The second will be put back into the linked list If there's insufficient contiguous memory, the allocation will fail (return 0) Free memory is stored as a linked list in address order Assume we start with a single contiguous block of FREE memory of size 64k starting at location…
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Memory (address space) is set aside at program startup to store things like text, data, and data structures (stack, heap). Describe the applications of stacks and heaps, and what the limits on their use are for a given process.