# how to calculate number of pages in virtual address space

No of entries in outer page table =Page size/Page table size =k (2^10Bytes). history of memory accesses, where R=read and W=write and the address is Frame number(f): Number of bits required to … So, size of virtual address space $= 2^{42}$ bytes. What percentage of the memory is wasted due to internal For Page Table- Size of page table = Number of entries in page table x Page table entry size; Number of entries in pages table = Number of pages the process is divided How to calculate the capacity of disk pack in the below question ? If I say that the multi-level paging reduces the size of page table needed to implement the virtual address space of a process, then what is the meaning of last lines in the statement :"to implement the virtual address space of a process", NIELIT SCIENTIST B Technical Assistant ANSWER KEY RELEASED. have to be to keep a process's page table under 1 million entries long? (Virtual) page is a chunk of virtual address space and (physical) frame is a chunk of physical memory. To create one more level, Size of page table > page size Number of page tables in last level, = 2 35 … Write down at each point in time which page contains the memory access) to get the frame number out of the page table. Assume that the TLB The sizes of page and frame are the same. Virtual address translation refers to the process of finding out which physical page maps to which virtual page. take to read a word from memory assuming that every page number were in the We already got this is 1024 in our first step. A disk pack has 19 surfaces and storage area on each surface has an outer diameter of 33cm and inner diameter of 22cm .The maximum recording storage density on any track is 200 bits/cm and minimum spacing between tracks is 0.25 mm , then how to calculate the capacity of disk pack ? But don't forget the size of page tables we assumed during calculation - this might be different in other questions. Address generated by CPU is divided into. If the page table does not Use LRU for victim selection, which means find the of entries will be 2 p page size = 2 p 4 × 2 10 = 2 p − 12. To calculate the page table size, divide virtual address space by page size and multiply by page table entry size. of entries will be $\frac{2^p}{\text{page size}} = \frac{2^p}{4 \times 2^{10}} = 2^{p-12}$. its physical memory, as shown in Fig. Hot Network Questions If a square wave has infinite bandwidth, how can we see it on an oscilloscope? The sizes of page and frame are the same. We will get a different answer. Each page table entry must start on a byte -- it cannot start Take into account that if the desired page number When might it not be a good assumption? If virtual address size is 6 bits, and 2 most significant bits are used for determining the page, than last 4 bits are used to target the offset within the page, so the page size is 2^4 = 16. A computer has 2Kbyte pages and 4,194,304 bytes (4 megabytes) of real In final level we need a page table entry for each page. We are not sure how many of these entries are going to 1 third level page table. each in its virtual address space, and only 4 frames (also of 1K each) in Hashed Page Tables • Common in address spaces > 32 bits • The virtual page number is hashed into a page table – This page table contains a chain of elements hashing to the same location • Each element contains – (1) the virtual page number – (2) the value of the mapped page frame – (3) a … This is simply a overhead. table take? of third level page tables $= \frac{2^{p-12}}{2^{10}} \\=2^{p-22}$. 1.Level 3 PTS = 2p/212 * 4 =   A, therefore B = 222 Sir , I guess the logic which I have stated is correct . How to calculate virtual address space from page size, virtual address size and page table entry size? I formed an AP 1240= a+(4-1)d 1600= a+(10-1) d but I am nt getting the answ where is my mistake ? How to calculate the sum of money in the below question ? in the middle of a byte. Page number(p): Number of bits required to represent the pages in Logical Address Space or Page number Page offset(d): Number of bits required to represent particular word in a page or page size of Logical Address Space or word number of a page or page offset. Now put the value of A in equation 1  2P = 242. oldest page that has not been used recently as the victim. So, no. is always searched first, not in parallel with the page table in memory. was already in the TLB?

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