What is static relocation and dynamic relocation in os

What is dynamic relocation in OS?

Dynamic relocation is where data currently stored in the computer memory is relocated to other parts of the computer. This process creates more efficient memory storage while a program is still active.

What is relocation in operating system?

Relocation is the process of assigning load addresses for position-dependent code and data of a program and adjusting the code and data to reflect the assigned addresses.

Which registers are used in dynamic relocation?

Dynamic relocation is performed by hardware and is simple – it requires two special registers, a simple addition, and a simple comparison. This is very inexpensive in computing terms.

What is relocation in virtual memory?

Dynamic Memory Relocation Each address generated by a process (called a virtual address) is translated in hardware to a physical address. This happens during every memory reference. Results in two views of memory, called address spaces: Virtual address space is what the program sees.

What is the difference between static and dynamic relocation?

Static Relocation – Program must be relocated before or during loading of process into memory. Program must always be loaded into same address space in memory, or relocator must be run again. Dynamic Relocation – Process can be freely moved around in memory.

What is linking and loading?

Linking and loading are two instruments that play a pivotal role in program execution. Linking intends to generate an executable module of a program by combining the object codes generated by the assembler. A loader, on the other hand, loads these executable modules to the main memory for execution.

What is dynamic loading and dynamic linking?

Dynamic loading refers to mapping (or less often copying) an executable or library into a process’s memory after it has started. Dynamic linking refers to resolving symbols – associating their names with addresses or offsets – after compile time.

What is relocatable address OS?

An address expression that has a fixed value, independent of run-time considerations such as where the program is located in memory, is called an absolute address expression. An address expression with a value that depends on run-time considerations is called a relocatable address expression.

What is difference between loader and linker?

A linker is an important utility program that takes the object files, produced by the assembler and compiler, and other code to join them into a single executable file. A loader is a vital component of an operating system that is accountable for loading programs and libraries.

What is the use of MMU?

An important function of the Memory Management Unit (MMU) is to enable the system to run multiple tasks, as independent programs running in their own private virtual memory space.

What is base and bounds in OS?

In computing base and bounds refers to a simple form of virtual memory where access to computer memory is controlled by one or a small number of sets of processor registers called base and bounds registers. In its simplest form each user process is assigned a single contiguous segment of main memory.

What is base register in OS?

• Base register: Specifies the smallest legal physical memory address. • Limit register: Specifies the size of the range. • A pair of base and limit registers specifies the logical address space. • The base and limit registers can be loaded only by the operating. system.

What is internal and external fragmentation?

Internal Fragmentation occurs when a process needs more space than the size of allotted memory block or use less space. External Fragmentation occurs when a process is removed from the main memory.

What is load time relocation?

Load-time relocation is one of the methods used in Linux (and other OSes) to resolve internal data and code references in shared libraries when loading them into memory.

What is the difference between static and dynamic?

In general, dynamic means energetic, capable of action and/or change, or forceful, while static means stationary or fixed. In computer terminology, dynamic usually means capable of action and/or change, while static means fixed.

What is the difference between static and dynamic object allocation explain with the help of suitable code in C++ to illustrate both?

Compile-time or Static Memory Allocation. Run-time or Dynamic Memory Allocation….Difference between Static and Dynamic Memory Allocation in C.

What is static variable with example?

The static variable can be used to refer to the common property of all objects (which is not unique for each object), for example, the company name of employees, college name of students, etc. The static variable gets memory only once in the class area at the time of class loading.