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Recent questions tagged tlb
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Recent questions tagged tlb
2
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1
UGCNET-Oct2020-II: 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 to search the $TLB$, and $150$ nanoseconds to access the main memory, then what is the effective memory access time, in nanoseconds? $185$ $195$ $205$ $175$
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 to search the $TLB$, and $150$ nanoseconds to access the main memory, then what is the effective memory access time, in nanoseconds? $185$ $195$ $205$ $175$
asked
Nov 20, 2020
in
Operating System
jothee
87
views
ugcnet-oct2020-ii
operating-system
tlb
2
votes
2
answers
2
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 entries and is $4$-way set associative. The minimum size of the TLB tag is $\text{11 bits}$ $\text{13 bits}$ $\text{15 bits}$ $\text{20 bits}$
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 entries and is $4$-way set associative. The minimum size of the TLB tag is $\text{11 bits}$ $\text{13 bits}$ $\text{15 bits}$ $\text{20 bits}$
asked
Mar 30, 2020
in
Operating System
Lakshman Patel RJIT
306
views
nielit2017july-scientistb-cs
operating-system
memory-management
paging
tlb
0
votes
0
answers
3
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 field is used to effectively label each entry with the ... for a simple (but nontrivial) input example. Plot the number of $TLB$ updates per $1000$ references.
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 field is used to effectively label each entry with the process id. Note that a nontagged $TLB$ can be ... your simulation behaves as expected for a simple (but nontrivial) input example. Plot the number of $TLB$ updates per $1000$ references.
asked
Oct 26, 2019
in
Operating System
Lakshman Patel RJIT
98
views
tanenbaum
operating-system
memory-management
paging
tlb
descriptive
0
votes
0
answers
4
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 through a large array. Explain the main concepts behind the ... but for an older computer with a different architecture and explain any major differences in the output.
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 through a large array. Explain the main concepts behind the program, and describe what you expect the output to ... . Repeat part $(b)$ but for an older computer with a different architecture and explain any major differences in the output.
asked
Oct 26, 2019
in
Operating System
Lakshman Patel RJIT
135
views
tanenbaum
operating-system
memory-management
virtual-memory
tlb
descriptive
0
votes
0
answers
5
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?
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?
asked
Oct 26, 2019
in
Operating System
Lakshman Patel RJIT
88
views
tanenbaum
operating-system
memory-management
paging
tlb
descriptive
1
vote
1
answer
6
Andrew S. Tanenbaum (OS) Edition 4 Exercise 3 Question 22 (Page No. 256)
A computer whose processes have $1024$ pages in their address spaces keeps its page tables in memory. The overhead required for reading a word from the page table is $5\: nsec.$ To reduce this overhead, the computer has a $TLB,$ ... a lookup in $1\: nsec.$ What hit rate is needed to reduce the mean overhead to $2\: nsec?$
A computer whose processes have $1024$ pages in their address spaces keeps its page tables in memory. The overhead required for reading a word from the page table is $5\: nsec.$ To reduce this overhead, the computer has a $TLB,$ which holds $32$ (virtual page, physical page frame) pairs, and can do a lookup in $1\: nsec.$ What hit rate is needed to reduce the mean overhead to $2\: nsec?$
asked
Oct 26, 2019
in
Operating System
Lakshman Patel RJIT
216
views
tanenbaum
operating-system
memory-management
paging
tlb
descriptive
1
vote
1
answer
7
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 page table entry can be found in $100$ ... $0.01\%$ lead to a page fault, what is the effective address-translation time?
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
114
views
tanenbaum
operating-system
memory-management
virtual-memory
tlb
descriptive
1
vote
1
answer
8
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] + 1; If this program is run on a machine with ... for every execution of the inner loop? Would your answer in part $(a)$ be different if the loop were repeated many times? Explain.
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] + 1; If this program is run on a machine with a $4-KB$ page size and $64$-entry $TLB,$ what values ... $TLB$ miss for every execution of the inner loop? Would your answer in part $(a)$ be different if the loop were repeated many times? Explain.
asked
Oct 26, 2019
in
Operating System
Lakshman Patel RJIT
63
views
tanenbaum
operating-system
memory-management
paging
tlb
descriptive
0
votes
1
answer
9
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 not present. Will this entry be considered for caching in TLB? As I understand from above line in Tanenbaum, The entry should not be present in TLB. Is my understanding right?
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 not present. Will this entry be considered for caching in TLB? As I understand from above line in Tanenbaum, The entry should not be present in TLB. Is my understanding right?
asked
May 9, 2019
in
Operating System
Mayank0343
169
views
self-doubt
operating-system
tlb
1
vote
1
answer
10
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 add a Translation Lookaside Buffer (TLB) and $75$ percent of all page-table references are ... memory reference time? Assume that finding a page-table entry in the TLB takes $20$ nanoseconds, if the entry is present.
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 add a Translation Lookaside Buffer (TLB) and $75$ percent of all page-table references are TLB hits, ... effective memory reference time? Assume that finding a page-table entry in the TLB takes $20$ nanoseconds, if the entry is present.
asked
Apr 8, 2019
in
Operating System
akash.dinkar12
301
views
isi2017-pcb-cs
operating-system
paging
tlb
descriptive
0
votes
1
answer
11
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, or is blocked (for example, waiting for I/O). This is illustrated ... the thread change state if an address reference is resolved in the page table? If so, to what state will it change?
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, or is blocked (for example, waiting for I/O). This is illustrated in Figure 9.31. Assuming a thread is ... change? c. Will the thread change state if an address reference is resolved in the page table? If so, to what state will it change?
asked
Mar 21, 2019
in
Operating System
akash.dinkar12
133
views
galvin
operating-system
virtual-memory
tlb
descriptive
0
votes
1
answer
12
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, explain why.) • $TLB$ miss with no page fault • $TLB$ miss and page fault • $TLB$ hit and no page fault • $TLB$ hit and page fault
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, explain why.) • $TLB$ miss with no page fault • $TLB$ miss and page fault • $TLB$ hit and no page fault • $TLB$ hit and page fault
asked
Mar 21, 2019
in
Operating System
akash.dinkar12
82
views
galvin
operating-system
virtual-memory
tlb
descriptive
1
vote
0
answers
13
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. When TLB and cache both get miss; page fault rate is 1% The TLB access and acache access are ... cycles Access to hard drive requires 50,000 cycles. Compute the average memory access latencies when the cache is physically addresses (in cycles).
Given the following information: TLB hit rate 95%, TLB access time is 1 cycle. cache hit rate 90 %, cache access time is 1 cycle. When TLB and cache both get miss; page fault rate is 1% The TLB access and acache access are sequential. ... 75 cycles Access to hard drive requires 50,000 cycles. Compute the average memory access latencies when the cache is physically addresses (in cycles).
asked
Mar 10, 2019
in
CO and Architecture
s_dr_13
409
views
cache-memory
co-and-architecture
virtual-memory
tlb
0
votes
0
answers
14
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% of access is in TLB and of the remaining, 20% is not present in the main memory. The effective memory access time is? Thanks!
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% of access is in TLB and of the remaining, 20% is not present in the main memory. The effective memory access time is? Thanks!
asked
Jan 27, 2019
in
Operating System
Abhipsa
508
views
operating-system
tlb
hit-ratio
paging
virtual-memory
2
votes
1
answer
15
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 size of $32$ bytes, and a PTE size of $2$ bytes, what is the minimum TLB hit ratio that results in an average v2p (virtual to physical) translation latency of $185$ ns?
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 size of $32$ bytes, and a PTE size of $2$ bytes, what is the minimum TLB hit ratio that results in an average v2p (virtual to physical) translation latency of $185$ ns?
asked
Jan 13, 2019
in
Operating System
dd
229
views
tlb
hit-ratio
0
votes
1
answer
16
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 8 ways. If TLB tag does not store any process id. The minimum length of TLB tag in bits is____
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 8 ways. If TLB tag does not store any process id. The minimum length of TLB tag in bits is____
asked
Jan 11, 2019
in
Operating System
newdreamz a1-z0
105
views
tlb
operating-system
1
vote
1
answer
17
Os TLB question
How they calculated time for number of levels?
How they calculated time for number of levels?
asked
Dec 16, 2018
in
Operating System
muthu kumar
718
views
operating-system
tlb
paging
0
votes
0
answers
18
MadeEasy Subject Test 2019: Operating System - Translation Lookaside Buffer
A TLB is a hardware device used for speeding up the conversation from virtual address to physical address. Consider a memory management unit where a memory reference takes 500 nanoseconds; TLB (Translation Look aside Buffer) reference ... EMAT using TLB ==> 640ns EMAT wthout TLB ==> 1000ns how to calculate speed Up.?
A TLB is a hardware device used for speeding up the conversation from virtual address to physical address. Consider a memory management unit where a memory reference takes 500 nanoseconds; TLB (Translation Look aside Buffer) reference takes 40 nanoseconds; and the hit-rate achieved with the ... no TLB ____ Here I got EMAT using TLB ==> 640ns EMAT wthout TLB ==> 1000ns how to calculate speed Up.?
asked
Dec 13, 2018
in
Operating System
jatin khachane 1
311
views
made-easy-test-series
operating-system
tlb
0
votes
1
answer
19
TLB OS
Why the formula used here is not P(10) + (1-P)(50) = 20 ?; A computer keeps its page tables in memory. The time required to read a word from the page table is 50ns. To reduce this overhead, the computer has a TLB, which holds 32 (virtual page, physical page frame) pairs and can ... : 10ns + (1 - p) 50ns = 20ns p =4/5 = .80 The TLB hit rate has to be 80% for a mean access time of 20ns.
Why the formula used here is not P(10) + (1-P)(50) = 20 ?; A computer keeps its page tables in memory. The time required to read a word from the page table is 50ns. To reduce this overhead, the computer has a TLB, which holds 32 (virtual page, physical page frame) pairs and can do ... Solution: 10ns + (1 - p) 50ns = 20ns p =4/5 = .80 The TLB hit rate has to be 80% for a mean access time of 20ns.
asked
Dec 3, 2018
in
Operating System
rahuljai
605
views
tlb
operating-system
hit-ratio
paging
virtual-memory
0
votes
1
answer
20
ace test series
A computer whose processes have 1024 pages in their address spaces keeps its page tables in memory. The overhead required for reading a word from the page table is 500 nsec. To reduce this overhead, the computer has tlb which holds 32 entries and can do look up in 100 nsec. What hit rate is needed to reduce the mean overhead to 200 nsec? can anyone solve this
A computer whose processes have 1024 pages in their address spaces keeps its page tables in memory. The overhead required for reading a word from the page table is 500 nsec. To reduce this overhead, the computer has tlb which holds 32 entries and can do look up in 100 nsec. What hit rate is needed to reduce the mean overhead to 200 nsec? can anyone solve this
asked
Nov 28, 2018
in
Operating System
vijju532
245
views
operating-system
tlb
paging
0
votes
0
answers
21
TLB Effective Access Time
asked
Nov 28, 2018
in
CO and Architecture
Balaji Jegan
552
views
tlb
0
votes
1
answer
22
SudoGate Test Series - Virtual Memory
A computer system has TLB access time = 30 ns and the main memory access time is 150 ns and if the miss rate is 20 % the calculate the effective memory access time if 3 level of paging is applied. i am getting 270 ns
A computer system has TLB access time = 30 ns and the main memory access time is 150 ns and if the miss rate is 20 % the calculate the effective memory access time if 3 level of paging is applied. i am getting 270 ns
asked
Nov 5, 2018
in
Operating System
Gurdeep Saini
260
views
operating-system
tlb
virtual-memory
1
vote
2
answers
23
Virtual Memory
Which of the following is true? A. If the page size increases page fault rate may also increase. B. Multi-level paging optimizes program execution time. C. Dynamic linking increases program execution time.Correct Option D. TLB is a software data structure.
Which of the following is true? A. If the page size increases page fault rate may also increase. B. Multi-level paging optimizes program execution time. C. Dynamic linking increases program execution time.Correct Option D. TLB is a software data structure.
asked
Jul 18, 2018
in
Operating System
Na462
496
views
virtual-memory
operating-system
memory-management
paging
tlb
0
votes
0
answers
24
caching and virtual memory
I am having troble with these following questions. Please I need help
I am having troble with these following questions. Please I need help
asked
Apr 19, 2018
in
Operating System
Samson Bankole
157
views
virtual-memory
operating-system
cache-memory
tlb
2
votes
0
answers
25
Does every process have its own TLB?
I know that every process has its own page table and but is it the same with TLB? Does every process have its own TLB or there is a master TLB which is used by all the processes?
I know that every process has its own page table and but is it the same with TLB? Does every process have its own TLB or there is a master TLB which is used by all the processes?
asked
Apr 6, 2018
in
Operating System
punkprincess
1.2k
views
tlb
2
votes
1
answer
26
My doubt on TLB and page fault
First read this whole thing what I am writing below: Case 1: If we have to access unit address in memory using TLB and we assume that no page fault occurs then, EMAT=p( T+M )+( 1-p ) (T+M+M) T=TLB access time, M= ... if there page fault occurs then how does the last calculated EMAT here affects the first Estimated memory access time which we have calculated using TLB?
First read this whole thing what I am writing below: Case 1: If we have to access unit address in memory using TLB and we assume that no page fault occurs then, EMAT=p( T+M )+( 1-p ) (T+M+M) T=TLB access time, M=memory access time( ... TLB and if there page fault occurs then how does the last calculated EMAT here affects the first Estimated memory access time which we have calculated using TLB?
asked
Apr 5, 2018
in
Operating System
Akash Kumar Roy
1.1k
views
operating-system
tlb
hit-ratio
page-fault
effective-memory-access
0
votes
0
answers
27
TLB JUST FOR KNOWLEDGE
TLB IS EITHER HARDWARE OR SOFTWARE PLZ EXPLAIN BRIEFLY?????
TLB IS EITHER HARDWARE OR SOFTWARE PLZ EXPLAIN BRIEFLY?????
asked
Dec 16, 2017
in
CO and Architecture
Sunidhi chauhan
124
views
tlb
0
votes
0
answers
28
OS TLB
compute system implement a 36-bit virtual address page size of 16KB and a 256-entry translation look aside buffer organized into 64 sets each having four ways.assume that the TLB tag does not store any process id. the minium length of the TLB tag in bits is?
compute system implement a 36-bit virtual address page size of 16KB and a 256-entry translation look aside buffer organized into 64 sets each having four ways.assume that the TLB tag does not store any process id. the minium length of the TLB tag in bits is?
asked
Dec 12, 2017
in
Operating System
Akshay Koli 4
287
views
tlb
operating-system
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