What is the size of the physical address space?

What is the size of the physical address space?

Physical addresses are 44 bits and there are 4 protection bits per page.

Can be larger than physical address space?

Logical Address space can be larger than physical address space. Explanation: The statement is true. Since, a part of the program needs to be in memory for the process of execution, the logical space can therefore be much larger than the physical address space. Explanation: Demand paging can implement virtual memory.

Can the virtual address space be smaller than the physical address space?

The virtual address space of each process can be smaller or larger than the total physical memory available on the computer.

What do you think will happen if your address space size is bigger than your physical memory?

When a virtual address space is larger than the physical memory, OS can use swapping to evict page frames (e.g. LRU eviction). CPU generates Page Fault where then page that is in disk is swapped into the main memory.

How do I know what size my frame is?

look up the page number in the page table and obtain the frame number. to create the physical address, frame = 17 bits; offset = 12 bits; then 512 = 29. 1m = 220 => 0 – ( 229-1 ) if main memory is 512 k, then the physical address is 29 bits.

How do I calculate my frame size?

The size of a frame is the same as that of a page, so the size of a frame is 1024 bytes (210 bytes). If the physical memory is 32MB (225 bytes), the number of frames is 225 / 210 = 215 and this is also the maximum number of pages that can be present in memory at the same time.

When there is a large logical address space?

If the size of logical address space is 2 to the power of m, and a page size is 2 to the power of n addressing units, then the high order bits of a logical address designate the page number, and the low order bits designate the page offset. Paging increases the time.

Where is virtual address space stored?

secondary storage
The virtual address space is kept in secondary storage (disk). The virtual part of virtual memory means that the operating system maintains an image of the address space in secondary storage. Because an image of the address space is kept in secondary storage, it can be larger than the physical memory.

What is the difference between virtual address space and physical address space?

Logical Address is generated by CPU while a program is running. The logical address is virtual address as it does not exist physically, therefore, it is also known as Virtual Address. The term Physical Address Space is used for all physical addresses corresponding to the logical addresses in a Logical address space.

Can physical memory be larger than virtual memory?

Virtual memory is typically larger than physical memory – there wouldn’t be much reason for virtual memory mappings if virtual memory and physical memory were the same size. Only the needed part of a program is resident in memory, typically – this is a topic called “paging”.

Does small wrists mean small frame?

For men, a wrist size of 5 1/2 to 6 1/2 inches indicates a small frame, while a measurement over 7 1/2 inches is typically of a larger bone structure. Females 5 feet 7 inches and taller are small boned if the wrist measures less than 6 1/4 inches and large framed if the wrist is more than 6 3/4 inches in circumference.