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Recent questions tagged translation-lookaside-buffer

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GO Classes Test Series 2024 | Mock GATE | Test 13 | Question: 46
Assume that for a given system, virtual addresses are $40$ bits long and physical addresses are $30$ bits long. The page size is $8$ KB. The Translation Look-aside Buffer ( ... $2^{20}$2^{13}$2^8$
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Madeeasy workbook, chapter: Memory management
Consider a k-level paging system along with a TLB. A TLB takes 10ns, and a memory takes 100ns on average. The hit ratio of TLB is equal to 0.8. If it is known that the average memory access time is 70ns, then the value of k is?
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DRDO CSE 2022 Paper 2 | Question: 9
Assume that in a certain computer, the virtual addresses are $64$-bit long, the physical addresses are $48$-bit long, and the memory is word-addressable. ... many distinct virtual addresses can be translated without any $\text{TLB}$ miss?
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GATE CSE 2022 | Question: 28
Which one of the following statements is $\text{FALSE}?$The $\text{TLB}$ performs an associative search in parallel on all its valid entries using page number ... hashing, then the memory access time of these addresses will not be the same.
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Applied Test Series
A computer system has a page size of 1024 bytes and maintains the page table for each process in main memory. The overhead required for doing a ... TLB hit-rate will ensure an average virtual address translation time of exactly 200ns?
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Applied Live Test
Given a byte addressable system which implements demand paging, a TLB has 64 entries and the frame size is 4KB. The LAS is 4MB. TLB has a hit ratio of 90% ... ms. The TLB reach for this system given above is _____ BAnyone can help this.
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Applied Practice test
Suppose: TLB lookup time = 20 nsTLB hit ratio = 80%Memory access time = 75 nsPFST = 500,000 ns50% of the pages are dirtyOS uses a single level page tableWhat ... the TLB, the page table, and the frame table (if needed) is negligible.
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UGC NET CSE | October 2020 | Part 2 | Question: 18
Consider a single-level page table system, with the page table stored in the memory. If the hit rate to TLB is $80\%$, and it takes $15$ nanoseconds ... $195$205$175$
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NIELIT 2017 July Scientist B (CS) - Section B: 32
A CPU generates $32$-bit virtual addresses. The page size is $4$ KB. The processor has a Translation Look-aside Buffer (TLB) which can hold a total of $128$ page table ... $\text{13 bits}$\text{15 bits}$\text{20 bits}$
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Andrew S. Tanenbaum (OS) Edition 4 Exercise 3 Question 55 (Page No. 261 - 262)
Write a program that can be used to compare the effectiveness of adding a tag field to $TLB$ entries when control is toggled between two programs. The tag ... nontrivial) input example.Plot the number of $TLB$ updates per $1000$ references.
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Andrew S. Tanenbaum (OS) Edition 4 Exercise 3 Question 53 (Page No. 261)
Write a program that demonstrates the effect of $TLB$ misses on the effective memory access time by measuring the per-access time it takes to stride ... computer with a different architecture and explain any major differences in the output.
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Andrew S. Tanenbaum (OS) Edition 4 Exercise 3 Question 23 (Page No. 256)
How can the associative memory device needed for a $TLB$ be implemented in hardware, and what are the implications of such a design for expandability?
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Andrew S. Tanenbaum (OS) Edition 4 Exercise 3 Question 22 (Page No. 256)
A computer whose processes have $1024$ ... What hit rate is needed to reduce the mean overhead to $2\: nsec?$
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Andrew S. Tanenbaum (OS) Edition 4 Exercise 3 Question 16 (Page No. 255)
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 ... only $0.01\%$ lead to a page fault, what is the effective address-translation time?
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Andrew S. Tanenbaum (OS) Edition 4 Exercise 3 Question 11 (Page No. 255)
Consider the following C program: int X[N]; int step = M; /* M is some predefined constant */ for (int i = 0; i < N; i += step) X[i] = X[i ... loop?Would your answer in part $(a)$ be different if the loop were repeated many times? Explain.
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Self Doubt : Regarding TLB entry for a page not present in memory
If a page is not present in the memory, then its corresponding entry in the page table would have the Present' bit set as 0 to indicate , the page is ... line in Tanenbaum, The entry should not be present in TLB. Is my understanding right?
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ISI2017-PCB-CS-5(b)
Consider a paging system with the page table stored in memory. If a memory reference takes $200$ nanoseconds, how long does a paged memory reference take? If we ... -table entry in the TLB takes $20$ nanoseconds, if the entry is present.
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Galvin Edition 9 Exercise 9 Question 15 (Page No. 452)
A simplified view of thread states is $Ready$, $Running$, and $Blocked$,where a thread is either ready and waiting to be scheduled, is running on the processor, ... is resolved in the page table? If so, to what state will it change?
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Galvin Edition 9 Exercise 9 Question 14 (Page No. 452)
Assume that a program has just referenced an address in virtual memory. Describe a scenario in which each of the following can occur. (If no such scenario can occur, ... page fault $TLB$ hit and no page fault $TLB$ hit and page fault
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Caching
Given the following information: TLB hit rate 95%, TLB access time is 1 cycle. cache hit rate 90 %, cache access time is 1 cycle. ... Compute the average memory access latencies when the cache is physically addresses (in cycles).
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effective memory access time
A demand paging uses a TLB and a single level page table stored in main memory. The memory access time is 5s. The page fault service time is 25s. If 70% ... 20% is not present in the main memory. The effective memory access time is?Thanks!
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TLB misses
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TLB hit ration and memory lookup time
Consider a system where TLB lookup time is $25$ ns and memory access time is $200$ ns, respectively. Assuming a virtual address space of $2$ KB, page ... that results in an average v2p (virtual to physical) translation latency of $185$ ns?
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me test series
A computer system implements a 38 bit virtual address, page size of 16 KB, and 256 entries translation look aside buffer (TLB) organized into 32 sets each having ... not store any process id. The minimum length of TLB tag in bits is____
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UPPCL AE 2018:57
Consider the following $\text{C}$ function executed in an $\text{OS}$ with paging where the page size is $4$ ... $ misses during the execution of the for loop?$2048$2$0$1$
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