search
Log In
0 votes
17 views
Copy on write is an interesting idea used on server systems. Does it make any sense on a smartphone?
in Operating System 17 views

Please log in or register to answer this question.

Related questions

0 votes
0 answers
1
35 views
Suppose that a machine has $438-bit$ virtual addresses and $32-bit$ physical addresses. What is the main advantage of a multilevel page table over a single-level one? With a two-level page table, $16-KB$ pages, and $4-byte$ entries, how many bits should be allocated for the top-level page table field and how many for the next level page table field? Explain.
asked Oct 26, 2019 in Operating System Lakshman Patel RJIT 35 views
0 votes
0 answers
2
62 views
You are given the following data about a virtual memory system: The $TLB$ can hold $1024$ entries and can be accessed in $1$ clock cycle $(1\: nsec).$ A page table entry can be found in $100$ clock cycles or $100\: nsec.$ The average page replacement time is $6\: msec.$ ... by the $TLB\:\: 99\%$ of the time, and only $0.01\%$ lead to a page fault, what is the effective address-translation time?
asked Oct 26, 2019 in Operating System Lakshman Patel RJIT 62 views
1 vote
1 answer
3
38 views
Suppose that a machine has $48-bit$ virtual addresses and $32-bit$ physical addresses. If pages are $4\: KB$, how many entries are in the page table if it has only a single level? Explain. Suppose this same system has a $TLB$ (Translation Lookaside Buffer ... and it sequentially reads long integer elements from an array that spans thousands of pages. How effective will the $TLB$ be for this case?
asked Oct 26, 2019 in Operating System Lakshman Patel RJIT 38 views
0 votes
1 answer
4
40 views
A machine has a $32-bit$ address space and an $8-KB$ page. The page table is entirely in hardware, with one $32-bit$ word per entry. When a process starts, the page table is copied to the hardware from memory, at one word every $100\: nsec.$ If each process runs for $100\: msec$ (including the time to load the page table), what fraction of the $CPU$ time is devoted to loading the page tables?
asked Oct 26, 2019 in Operating System Lakshman Patel RJIT 40 views
...