That is the role of the virtual memory manager, not the operating system. Computer systems have limited amounts of memory. For instance, a 32-bit system is only capable of addressing 2^32 (4,294,967,296) physical addresses. If each address is one byte (8 bits) in length, the system will be limited to a maximum of 4 GB of memory. This includes any peripheral memory such as graphic card memory.
Every process has its own address space. This memory is shared by all threads of execution. In addition, each thread has its own address space and call stack. However, all this memory is allocated from virtual memory. In order to make use of that memory, the VMM maps the virtual addresses used by the application to the physical addresses used by the machine, and handles the translation between the two.
When physical memory is required and there is none available, the VMM pages out idle memory to a disk file (known as a swap file or page file). Whenever a page fault occurs, this means the requested virtual address is currently paged out and must be paged back into physical memory. Thus the physical addresses may change between swaps while a task is executing, but the virtual addresses used by the application will never change. If paging is excessive, the system can become less responsive. Terminating all unused programs will alleviate this problem by reducing paging.
Logical address - generated by the CPU; also referred to as virtual address.Physical address - address seen by the memory unit (loaded into memory-address register).Logical and physical addresses are the same in compile-time and load-time address-binding schemes; logical (virtual) and physical addresses differ in execution-time address-binding scheme.Logical address space: the set of all logical addresses generated by a program.physical address space: the set of all physical addresses corresponding to these logical addressesThe user program deals with logical addresses; it never sees the real physical addresses.
The concept of a logical address space is simply involved the process of mapping the Logical addresses to their Physical Addresses . Logical addresses are generated by the CPU; also referred to as virtual addresses.while Physical Address is the actual address of the data stored on the physical device and mapped by MMU.
Layer 3 network addresses are logical addresses and can be easily changed by software.
Address Resolution Protocol (ARP)
Data Link Layer
Physical address is the actual address of a device set in its hardware, so it can be recognized as unique.Logical address is the address assigned by the operating system to a device. The operating system maintains a logical to physical address map table.
Address Resolution Protocol (ARP)ARP is primarily used to translate IP Addresses to Ethernet MAC Addresses.
Logical address is the address generated by the CPU (from the perspective of a program that is running) whereas physical address (or the real address) is the address seen by the memory unit and it allows the data bus to access a particular memory cell in the main memory. All the logical addresses need to be mapped in to physical addresses before they can be used by the MMU. Physical and logical addresses are same when using compile time and load time address binding but they differ when using execution time address binding.
The IP protocol identifies both the logical host as well as the logical network addresses...........
Physical Address refers to Storage location on Physical Memory wheres Logical Addressing is used by Memory Managing Programs to refers addresses from Physical Memory and Virtual Memory.
The Intel Pentium supports pure segmentation and segmentation with paging. The processor creates logical addresses, which are mapped to physical addresses by the segmentation unit. Those addresses may point to physical addresses within memory or paged swap space.
A logical address is a reference to a memory location independent of the current assignment of data to memory; a translation must be made to a physical address before the memory access can be achieved. A relative address is a particular example of logical address, in which the address is expressed as a location relative to some known point, usually a value in a processor register. A physical address, or absolute address, is an actual location in main memory.
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What is one purpose of using logical addresses in an IP network?
A logical (or virtual) address is a reference to a memory location independent of the current assignment of data to memory; a translation must be made to a physical address before the memory access can be achieved. A relative address is the address expressed as a location relative to some known point, usually the beginning of the program. A physical address, or absolute address, is an actual location in main memory.
The Physical address can be calculated asPhysical address = Base address + Offset.So take Base,Offsets,Lengths in to different arrays and check whether offset is less than length , if it is then the physical address would be base+ Offset , if not then that is a segment error.
In computer architectures, a logical address is the address at which a memory location appears to reside from the perspective of an executing application program. This may be different from the physical address due to the operation of a memory management unit (MMU) between the CPU and the memory bus. Physical memory may be mapped to different logical addresses for various purposes. For example, the same physical memory may appear at two logical addresses and if accessed by the program at one address, data will pass through the processor cache whereas if it is accessed at the other address, it will bypass the cache.
MSDOS.SYS accepts logical io requests from application programsor other operating system modules translates them into physical io commands and passes the phsicsal commands to IO.SYS
logical address and physical addressIn a system, there are two types of addresses: logical and physical. Another name for logical address is IP address and it is set by your Internet service provider (ISP) or your router. If you have a router then you have a LAN, which sets a logical address for your computer. Your router will have an logical address set by your ISP.The physical address is also called the MAC address and it is generated by the manufacturer. (but only to a given extent)Because a MAC address is assigned (by the FCC) to a company to use for a range of products.For example:01:23:45:00:00:00 - 01:23:45:FF:FF:FFWould be their "range" of MAC addresses. They use a coding called Hex which is not to far off from what you know which is base-10 (0-9).Instead hex uses (0-F). 0123456789ABCDEFA = 10, B = 11, etc.Read more: What_is_the_difference_between_logical_address_and_physical_addresses
Physical servers (also referred to as boxes) are represented by physically or virtually separate computers with their own operating systems (Linux, FreeBSD Unix, or Windows).
logical and mac
In the 8086/8088 the physical address and logical address have the same importance, because they both relate to the address of the operand. It is true that the offset (logical) address is added to the segment address to determine the physical address, but the limitations of the architecture of the processor forces programmers to consider both.If you are talking about a virtual environment, however, such as in the 80286 or higher, then the logical address is more important than the physical address, because the logical address is the address of the operand, while the physical address is (somewhat) arbitrarily assigned by the operating system.
How does the logical topology differ from the physical topology? Can a single physical topology support multiple logical topologies? Answer with proper reasons