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Address space refers to how much memory you could potentially talk to so for instance a 32bit processor has a 32 bit addres space i.e. 2^32 = 2 x 2 x 2 ..... 32 times which equals 4294967296 - this is 4Gigabytes. The physical memory is how much memory you have installed so this could be anything up to 4GB. Any memory above 4GB would no be able to be used by the processor.
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In paged system Can the logical address space b larger than physical address space?
Yes. This is the fundamental premise of paged or virtual memory - that you can have more logical memory than physical memory.
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.
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
What are the implications of having a machine with 48-bit virtual addresses and 32-bit physical addresses?
Having a machine with 48-bit virtual addresses and 32-bit physical addresses means that the system can address a larger amount of virtual memory than physical memory. This can lead to potential issues with memory management, such as increased overhead for address translation and the possibility of running out of physical memory space. It may also impact the efficiency and performance of the system, as the mismatch between virtual and physical memory sizes can result in slower data access times.
Is it conceivable that some operating system processes might have the entire main memory as their address space?
No, it is impossible. The operating system kernel must remain in memory at all times, including the virtual memory manager, thus no single process can physically occupy every address. Indeed, all unused physical memory is allocated to the virtual memory manager. Processes are allocated addresses within the virtual address space but some of those addresses are reserved for system use only. As such, no process can ever use the entire virtual address space let alone the entire physical address space.
What is contiguous allocation?
Paging is a memory management scheme that permits the physical- address space of process to be noncontiguous.
What are the motivation for providing swapping in operating system?
To be able to use a larger address space (More memory for programs)
What is the use of resident monitor in memory management?
1. It is a Primitive Operating System. 2. Usually in low memory where interrupt vectors are placed. 3. It Isolate user from physical address space using logical address space
Physical address and logical address?
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.
What is deffernce between virtual and physical memory?
The difference between virtual and physical memory is that virtual memory refers to memory space while physical memory are chips like RAM. The memory space for virtual memory is made by operating system when there is insufficient physical memory.
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.
What is the difference between a physical address and a mailing address?
Real memory uses Physical addresses.These are the members that the memory chips react to on the bus. Virtual addresses are the logical addresses that nrefer to a process' address space. Thus, a machine with a 16-bit word can generate virtual addresses upto 64K, regardless of whether the machine has more or less memory than 64 KB
