Page 199 - DCAP103_Principle of operating system

Principles of Operating Systems

Notes As with the working-set strategy, we may have to suspend a process. If the page-fault rate
increases and no free frames are available, we must select some process and suspend it. The
freed frames are then distributed to processes with high page-fault rates.

Write a program for memory management

#include <memory>

#include <iostream>
int main( ) {
std::auto_ptr<int> a(new int(3));
// a.get( ) returns the raw pointer of a
std::cout << “a loc: “ << a.get( ) << ‘\n’;

std::cout << “a val: “ << *a << ‘\n’;

std::auto_ptr<int> b;

b = a; // now b points to the int, a is null

std::cout << “b loc: “ << b.get( ) << ‘\n’;
std::cout << “b val: “ << *b << ‘\n’;
std::cout << “a loc: “ << a.get( ) << ‘\n’;

return 0;
}
Questions:

1. Give the brief about the pointer in memory.
2. Explain the Garbage collection (GC) in memory management.

1. Assuming a 1-KB page size, what are the page numbers and offsets for
the following address references (provided as a decimal numbers):
( a) 2375
( b) 19366
( c) 30000
( d) 256
( e) 16385
2. C Program for First In First Serve Algorithm.

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