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From operating system point of view there is no difference between physical and virtual processor. But conceptually both of these are different.
Physical Processor
The physical processor is physical entity.
Virtual Processor
Virtual Processor is logical entity. The physical processor is divided into processing units. And one or several processing units are combined together to make virtual processor. The processing capacity is distributed in terms of virtual processors and not as processing units.
For example, if we have 2.0 physical processors and we take 0.4 processing units as one virtual processor. This will leave shared pool with 5 virtual processors.
If the processing units required for a partition are 1.2 then 3 virtual processors will be allocated for that partition.
If the processing units required for a partition are 1.7 then 5 virtual processors will be allocated for that partition.
That means the number of virtual processors is rounded to the next higher level.
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∙ 13y ago
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∙ 12y agomathsiscool.com
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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.
What kind of memory address does a CPU generate?
- An MMU (memory management unit) generates physical address. - A CPU (central processing unit) generates a logical address.
Difference between physical access and logical access between CPU and peripherals?
A logical access assumes that the location to be read or written is contained within a linear address space, while a physical access describes the actual access to the appropriate sector, the location within the assumed linear address space must be converted into the corresponding platter, sector, and track, and the disk hardware must be instructed to access that specific location.
What is the difference between a 4p and 2p server?
A 4p server has 4 CPU socket in one motherboard; i.e. 4 physical CPU's(not just cores or threads) on one motherboard. A 2p server has dual CPU.
What is the difference between physical memory and logical memory?
Look at it this way, Say a application needs something computed by the CPU. That application says to the CPU, "I'm going to send you 500 pieces of data, so I need a space in the memory that is 500 pieces of data big." So the CPU takes a look at the memory. Initially there is room for 10,000 pieces of data, but because there are other processes already running the first 1 - 2,000 pieces are already taken up. The CPU says to himself from piece 2,000 to 2,500 is were all new data is going to go. The physical memory is the address from 2,000 to 2,500. Now the application doesn't realize that there are other processes that the CPU is taking care of. All it sees is the data 1- 500 pieces stored in the memory. This is logical memory. When the application wants to run a piece of data of the 1-500, its says to the CPU run the piece 130. In reality 130 is not even a space in the memory that the CPU has set out for the application. Because remember it was originally 2,000-2500 that was set aside for the application. Piece 130 according to the applications logical memory is in reality piece 2130 in the physical memory. So when the CPU is receiving instructions from the application it has to translate the logical memory in to the physical memory and then back into the logical when replying to the application.
What is the difference between the arithmetic operations and logical operations which are performed by the CPU?
An arithmetic operation is dealing with data in a computational manner, adding subtracting, etc A logical operation would normally be regarded a a comparison and decision, though one school of though would include the literally 'logical operations' such as NOT, OR, AND, etc.
Differences between physical addressing and logical addressing?
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.
How does CPU generate logical address?
Lets take the scenario of CPU MMU (memory management unit) Physical Memory.CPU generates the logical address as Page number + Page offset.Of course this address will point to some physical address.Page number is for the index in page table (for base address).The base address + offset is sent to MMU which is mapped to the corresponding physical page.
Why are laptops more sensitive to bugs viruses etc than pc-s?
They aren't. They are susceptible to the same weaknesses. There is no logical difference between laptops and desktops. Only physical differences (CPU speed, form factor and size, etc.) Laptops do not introduce any more security risks than are common in desktops.
What is logical address space and physical address space?
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.
What is logic unit in CPU?
It performs arithmetic and logic operations within the microprocessor.
Difference between multicomputer and multiprocessor?
Multiprocessors have a single physical address space (memory) shared by all the CPUs whereas multicomputers have one physical address space per CPU Multiprocessors have a single physical address space (memory) shared by all the CPUs whereas multicomputers have one physical address space per CPU
