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What is paging in an operating system?
Paging in an operating system is part of the operation of virtual memory. Physical pages of memory are being swapped back and forth for virtual pages of memory in a file on the hard disk. This swapping allows all programs to see the same memory structure (e.g. program loads at the same fixed virtual address in memory) and allows the machine to run as if it had more memory than it really does (but at a small speed penalty). Programs and utilities that are idle may stay loaded and ready to run, but paged out of physical memory until actually needed.
Why might an operating system on a virtual machine run slower than one installed directly on a PC?
any high end database(datacenter) server, exchange server, any high end appliaction server which require dedicated physical resources will work better on physical then virtual. They will work slow on Virtual servers
What is contiguous allocation?
Paging is a memory management scheme that permits the physical- address space of process to be noncontiguous.
What is the relationship between guest operating system and host operating system?
These terms are typically only applied in cases where a virtual machine is in use (a computer program that emulates a physical computer), popular examples include VMware, VirtualBox and user-mode Linux. In this case the "host" operating system is running on the physical computer and the "guest" operating system is running in the emulation software. For example I have a workstation running Debian Linux as a host operating system. When I want to compile a program for several versions of windows I can launch several instances of VirtualBox to bring up virtual machines running Windows XP, Vista and Windows 7 in both 32 and 64 bit versions as guest operating systems. This lets me easily compile the program with optimizations for each of these operating systems using a single workstation and without rebooting. Virtual machines are also common in web hosting. There are a number of hosting service providers who's business model consists entirely of selling access to user-mode Linux virtual machines. In this case the Linux guest operating system is actually running in a virtual machine under a Linux host operating system, the benefit of using virtual machines is that each customer may be given complete control over their virtual server, while the hosting company can run hundreds or even thousands of virtual servers from a handful of physical computer systems.
What are some virtual worlds that don't require email addresses?
Most today have email addresses. If you want to find one keep looking.www.poptropica.com does not require an email address to play, nor does supersecret.comProbably not. Most sites that involve any social interaction at all are going to want your email address, so they can contact you, or block you if necessary. Just create a free webmail account with Yahoo or Google Mail and use that.
What is meant by effective address in microprocessor?
Effective address is the final address generated by offsetting and indexing which is sent to the virtual translation logic. It is the address of the operand in the virtual address space of the process, but not necessarily the address of the operand in the physical address space of the computer. In the 8085, efffective/virtual address is the same as physical address, because there is no virtual addressing logic in the 8085. In the 8086/8088, effective/virtual address is the same as physical address, but only in real mode. For example, in the 8086/8088, if the EBX register contains 1000000H, then the instruction MOV EAX,[EBX+1234H] has an effective address of 10001234H.
How does the virtual address to physical address mapping work in computer systems?
In computer systems, the virtual address to physical address mapping works through a process called address translation. The operating system manages this mapping by using a page table, which stores the correspondence between virtual addresses used by programs and their corresponding physical memory locations. When a program accesses a virtual address, the operating system translates it to the corresponding physical address to retrieve the data stored in memory. This allows programs to efficiently access and manipulate data without needing to know the physical location of the memory.
How physical address is generated?
A physical address is generated through a process called address translation, which typically involves the use of a memory management unit (MMU). When a program accesses a virtual address, the MMU translates this virtual address into a physical address by using a page table that maps virtual pages to physical frames in memory. This process allows the operating system to efficiently manage memory and provide isolation between processes. Ultimately, the physical address corresponds to a specific location in the computer's RAM where data is stored.
Do I need a physical office in Malaysia?
Not necessary. Physical address is not mandatory when you have a valid virtual address that comes under the jurisdiction of Malaysian government. Virtual office concepts getting the attention nowadays.
Can physical address and virtual address be same?
your question is wrong. it should be "can physical address and logical address be same" answer is no because logical address is the combination of page number and offset whereas physical address is the combination of physical page[frame] and offset
What is the difference between virtual logical and physical address spaces?
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.
Why you need memory physical address and memory logical address?
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.
How do you calculate paging address?
To calculate a paging address, you need to divide the virtual address into two parts: the page number and the offset. The page number is obtained by dividing the virtual address by the page size, while the offset is found by taking the modulus of the virtual address with the page size. The page table is then used to translate the page number into a corresponding physical frame number, which is combined with the offset to form the final physical address.
What identifies the virtual machine and is part of the machine and physical network address?
The virtual machine is identified by its unique MAC (Media Access Control) address, which is assigned to its virtual network interface card (vNIC). This MAC address is essential for communication within the physical network, allowing the virtual machine to send and receive data. Additionally, the virtual machine has an IP (Internet Protocol) address, which is assigned within the network and enables it to connect to other devices over the internet or local network. Together, these addresses help manage and route network traffic to and from the virtual machine.
What does physical address mean?
The physical address is the final address that is presented to the bus, at the pins of the microprocessor chip, to form the address of the desired item in memory.In the 8085, physical and effective addresses are one and the same.In the 8086/8088, the physical address is the effective address plus 16 times one of the segment registers.In higher level processors, such as the 80386 and beyond, the physical address is formed by lookup of the effective address in a page table to convert from virtual/effective address to physical, or linear, address.The effective/virtual address is the address generated by the instruction and the programmer, without regard to any underlying addressing scheme. This is the address used when considering the "programming model", in "user mode".
How do you obtain a Physical address before owning property in area?
You can rent a mailbox at a local post office or obtain a virtual mailbox service. Virtual mailbox services provide a physical address that can receive and manage your mail remotely. Alternatively, you can use a co-working space or a business center to obtain a physical address for business purposes.
The virtual memory addressing capability of 80386 is?
NONE! The 80186 was an advanced version of the 8086 but did not include support for virtual memory. It had a 64K physical address space. The 80286 was the first Intel CPU to support virtual memory but it's capabilities were limited.
