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Recent questions tagged virtual-memory
0
votes
1
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121
What is the reason for Belady's Anamoly
What is the reason for Belady’s Anomaly,I am aware that it is not a stack based algorithm and for a certain set of pages it shows this anomaly where the increase in page frame increases the page fault rate.
What is the reason for Belady’s Anomaly,I am aware that it is not a stack based algorithm and for a certain set of pages it shows this anomaly where the increase in pag...
sripo
930
views
sripo
asked
Dec 28, 2018
Operating System
page-replacement
virtual-memory
operating-system
+
–
4
votes
1
answer
122
GATE Overflow | Mock GATE | Test 1 | Question: 18
Assume a program has just referenced an address in virtual memory. Which of the following scenario cannot occur? TLB miss with no page fault TLB hit and page replacement TLB miss and page fault TLB hit with no page fault
Assume a program has just referenced an address in virtual memory. Which of the following scenario cannot occur?TLB miss with no page faultTLB hit and page replacementTLB...
Ruturaj Mohanty
1.3k
views
Ruturaj Mohanty
asked
Dec 27, 2018
Operating System
go-mockgate-1
operating-system
memory-management
virtual-memory
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–
2
votes
2
answers
123
GATE Overflow | Mock GATE | Test 1 | Question: 19
A computer system consists of infinitely large primary memory storage capacity. In other words the physical address space exceeds the logical address space significantly in all cases. In such situation which of the following ... cannot be used in such situation Virtual memory concept can be used to give multiprogramming capability to system
A computer system consists of infinitely large primary memory storage capacity. In other words the physical address space exceeds the logical address space significantly ...
Ruturaj Mohanty
1.5k
views
Ruturaj Mohanty
asked
Dec 27, 2018
Operating System
go-mockgate-1
operating-system
memory-management
virtual-memory
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–
8
votes
1
answer
124
GATE Overflow | Mock GATE | Test 1 | Question: 38
Consider a system with paging-based memory management, whose architecture allows for a $4\text{GB}$ virtual address space for processes. The size of logical pages and physical frames is $4\text{KB}$. The system has $8\text{GB}$ physical RAM. The system allows a maximum of ... $4 \text{GB} + 4 \text{KB}$ $4 \text{MB} + 4 \text{GB}$
Consider a system with paging-based memory management, whose architecture allows for a $4\text{GB}$ virtual address space for processes. The size of logical pages and phy...
Ruturaj Mohanty
2.6k
views
Ruturaj Mohanty
asked
Dec 27, 2018
Operating System
go-mockgate-1
virtual-memory
memory-management
operating-system
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2
votes
1
answer
125
MadeEasy Subject Test 2019: Operating System - Virtual Memory
jatin khachane 1
503
views
jatin khachane 1
asked
Dec 13, 2018
Operating System
made-easy-test-series
operating-system
virtual-memory
paging
page-fault
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–
0
votes
2
answers
126
NIELIT 2018-48
Decreasing the RAM causes fewer page faults more page faults virtual memory gets increased virtual memory gets decreased
Decreasing the RAM causesfewer page faultsmore page faultsvirtual memory gets increasedvirtual memory gets decreased
Arjun
3.4k
views
Arjun
asked
Dec 7, 2018
Operating System
nielit-2018
operating-system
virtual-memory
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0
votes
1
answer
127
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 pagetable is 50ns. To redu...
rahuljai
1.3k
views
rahuljai
asked
Dec 3, 2018
Operating System
translation-lookaside-buffer
operating-system
hit-ratio
paging
virtual-memory
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0
votes
3
answers
128
OS-Virtual Memory
A computer system has a page size of 1024 bytes and maintains page table for each process in the main memory.The overhead required for doing a lookup in the page table is $500ns$.To reduce this overhead, the computer has a TLB that caches 32 ... mappings.A TLB lookup requires $100ns$.What TLB hit-rate is required to ensure an average virtual address translation time of $200ns$?
A computer system has a page size of 1024 bytes and maintains page table for each process in the main memory.The overhead required for doing a lookup in the page table is...
Ayush Upadhyaya
1.2k
views
Ayush Upadhyaya
asked
Dec 2, 2018
Operating System
operating-system
virtual-memory
paging
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–
0
votes
0
answers
129
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 l...
Gurdeep Saini
620
views
Gurdeep Saini
asked
Nov 5, 2018
Operating System
operating-system
translation-lookaside-buffer
virtual-memory
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–
0
votes
0
answers
130
self_doubt
A processor uses 36 bit physical address and 32 bit virtual addresses, with a page frame size of 4 Kbytes. Each page table entry is of size 4 bytes. A three level page table is used for virtual to physical address translation, where the virtual ... table entry of the first, second and third level page tables are respectively. modified from : https://gateoverflow.in/490/gate2008-67
A processor uses 36 bit physical address and 32 bit virtual addresses, with a page frame size of 4 Kbytes. Each page table entry is of size 4 bytes. A three level page ta...
Dharmendra Lodhi
987
views
Dharmendra Lodhi
asked
Oct 20, 2018
Operating System
virtual-memory
operating-system
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–
1
votes
2
answers
131
AceBook
Consider the machine with 64 MB Physical Memory and a 34 bit Virtual Address Space. If the page size is 4KB, the appropriate sizes of conventional and inverted page table sizes are: a) 4M, 4K b)4K, 4M c)4M, 16K d)16K, 4M. soln: is Option C. but my ans is (7MB, 28KB)
Consider the machine with 64 MB Physical Memory and a 34 bit Virtual Address Space. If the page size is 4KB, the appropriate sizes of conventional and inverted page table...
abhishek1995_cse
1.8k
views
abhishek1995_cse
asked
Oct 16, 2018
Operating System
memory-management
paging
virtual-memory
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–
1
votes
1
answer
132
Virtual Memory
Na462
754
views
Na462
asked
Sep 29, 2018
Operating System
virtual-memory
operating-system
memory-management
paging
+
–
0
votes
0
answers
133
Self doubt
When the process is in memory and executing with PC value = 100 Let virtual memory concept is used when next process is scheduled and main memory doesn't have space so anyone one of the process(pages) should be swapped out to secondary memory. If currently ... then in order to preserve its state does OS stores its PCB also in Secondary storage ?? and restore later to MM ??
When the process is in memory and executing with PC value = 100Let virtual memory concept is used when next process is scheduled and main memory doesn't have space so any...
jatin khachane 1
140
views
jatin khachane 1
asked
Sep 14, 2018
Operating System
operating-system
co-and-architecture
virtual-memory
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–
0
votes
0
answers
134
Galvin #OS Please explain this diagram from VM.
What exactly is happening here? I can't figure out the arrows!
What exactly is happening here? I can't figure out the arrows!
iarnav
384
views
iarnav
asked
Sep 12, 2018
Operating System
operating-system
virtual-memory
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–
0
votes
0
answers
135
Testbook Test Series: Operating System - Virtual Memory
sudhir singh
421
views
sudhir singh
asked
Aug 22, 2018
Operating System
testbook-test-series
operating-system
virtual-memory
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–
0
votes
1
answer
136
Galvin, Virtual memory exercise 9.15
A simplified view of thread states is Ready, Running, andBlocked, where a thread is either ready andwaiting to be scheduled, is running on the processor, or is blocked (for example, waiting for I/O). Assuming a thread is in the Running state, ... will change its state from running to waiting. However, I am highly confused over answers to part b, and part c.
A simplified view of thread states is Ready, Running, andBlocked, where a thread is either ready andwaiting to be scheduled, is running on the processor, or is blocked (f...
Harsh Kumar
1.8k
views
Harsh Kumar
asked
Aug 14, 2018
Operating System
operating-system
virtual-memory
memory-management
galvin
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0
votes
0
answers
137
Virtual Memory
An operating system supports a paged virtual memory, using a central processor with a cycle time of 1 microsecond. It costs an additional 1 microsecond to access a page other than the current one. Pages have 1000 words, and the paging device is a ... anybody explain.. Also, I am getting highly frustrated over such questions. Please tell me how to solve these questions correctly?
An operating system supports a paged virtual memory, using a central processor with a cycle time of 1 microsecond. It costs an additional 1 microsecond to access a page o...
Harsh Kumar
457
views
Harsh Kumar
asked
Aug 13, 2018
Operating System
operating-system
page-replacement
galvin-9th-edition
virtual-memory
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–
2
votes
3
answers
138
Memory Management and Virtual Memory GATE - 2004
Consider a system with a two level paging scheme in which a regular memory access takes 150 ns, and servicing a page fault takes 8 ms. An average instruction takes 100 ns of CPU time, and two memory accesses. The TLB hit ratio is 90% ... instructions. What is the effective average instruction execution time? a) 645 ns b) 1050 ns c) 1215 ns d) 1230 ns
Consider a system with a two level paging scheme in which a regular memory access takes 150 ns, and servicing a page fault takes 8 ms. An average instruction takes 100 ns...
nishant279
2.1k
views
nishant279
asked
Aug 7, 2018
Operating System
operating-system
memory-management
virtual-memory
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–
0
votes
0
answers
139
performance cache exercise help
First level data cache: Direct mapping , writeThrough/write allocate , 8kb data and lines of 8 bytes, miss rate= 17% First level instructions cache: Direct mapping,, 4kb data and lines of 8 bytes, miss rate= 2% Second level unified cache: ... accesses to data memory and instructions of the total number of accesses? 5)What is the average memory access time? Thanks !!
First level data cache: Direct mapping , writeThrough/write allocate , 8kb data and lines of 8 bytes, miss rate= 17%First level instructions cache: Direct mapping,, 4kb d...
mauro5991
409
views
mauro5991
asked
Aug 2, 2018
CO and Architecture
virtual-memory
cache-memory
co-and-architecture
memory-management
multilevel-cache
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–
1
votes
0
answers
140
Virtual Memory
How we can improve size of virtual memory?
How we can improve size of virtual memory?
srestha
595
views
srestha
asked
Aug 1, 2018
Operating System
virtual-memory
operating-system
+
–
1
votes
2
answers
141
Virtual Memory
A computer uses 30 bit physical address, 38 bit virtual address and uses 2-level paging. The page table base register stores the base address of the first level, Each page table, occupied exact one page. Each entry of first level store base address of second level ... second level table store a page table entry which is of size 32 bits. The size of page in KB in computer is ________.
A computer uses 30 bit physical address, 38 bit virtual address and uses 2-level paging. The page table base register stores the base address of the first level, Each pag...
Na462
1.3k
views
Na462
asked
Jul 19, 2018
Operating System
virtual-memory
operating-system
memory-management
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–
0
votes
0
answers
142
Memory References
Na462
447
views
Na462
asked
Jul 19, 2018
Operating System
memory-management
operating-system
virtual-memory
+
–
1
votes
2
answers
143
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 i...
Na462
1.8k
views
Na462
asked
Jul 18, 2018
Operating System
virtual-memory
operating-system
memory-management
paging
translation-lookaside-buffer
+
–
0
votes
1
answer
144
Virtual Memory
Virtual memory increases degree of multiprogramming Virtual memory decreases degree of multiprogramming Degree of multiprogrammoing means number of process is in memory. (and I think memory here is primary memory and not secondary memory such as disk or magnetic tape) ... memory must decreses use of main memory. But according to prediction it is wrong. Where Am I getting wrong?
Virtual memory increases degree of multiprogrammingVirtual memory decreases degree of multiprogrammingDegree of multiprogrammoing means number of process is in memory. ...
srestha
2.0k
views
srestha
asked
Jul 12, 2018
Operating System
virtual-memory
operating-system
memory-management
+
–
0
votes
1
answer
145
Virtual Memory
Na462
553
views
Na462
asked
Jul 12, 2018
Operating System
virtual-memory
operating-system
memory-management
paging
+
–
0
votes
1
answer
146
Virtual Memory
Na462
786
views
Na462
asked
Jul 12, 2018
Operating System
virtual-memory
operating-system
memory-management
paging
+
–
1
votes
1
answer
147
Made easy workbook
Assume that a memory with only 4 pages,each of 16 bytes,is initially empty.The CPU generates the following sequence of virtual addresses and uses the LRU page replacement policy. 0,4,8,20,24,36,44,12,68,72,80,84,28,32,88,92 How many page faults does this sequence cause?What are the page number of ... sequence? A)6 and 1,2,3,4 . B)7 and 1,2,4,5 C)8 and 1,2,4,5 . D)9 and 1,2,3,5
Assume that a memory with only 4 pages,each of 16 bytes,is initially empty.The CPU generates the following sequence of virtual addresses and uses the LRU page replacement...
Avik Chowdhury
468
views
Avik Chowdhury
asked
Jul 10, 2018
Operating System
virtual-memory
+
–
2
votes
1
answer
148
Made easy workbook
The number of page faults with a given string "S " using LRU algorithm is "N" and considering the reverse of string S^R the number of page faults will be A)N. B)N/2 C)2N. D)3.75N
The number of page faults with a given string "S " using LRU algorithm is "N" and considering the reverse of string S^R the number of page faults will beA)N. ...
Avik Chowdhury
1.2k
views
Avik Chowdhury
asked
Jul 10, 2018
Operating System
virtual-memory
+
–
2
votes
2
answers
149
Ace Test Series: Operating System - Virtual Memory And Paging
Na462
540
views
Na462
asked
Jul 3, 2018
Operating System
operating-system
virtual-memory
paging
ace-test-series
+
–
1
votes
1
answer
150
Topic: virtual memory.
Suppose the average page fault service time is 20 milliseconds and memory access time is 200 nanoseconds. Assuming we wish to have less than 10% degradation in memory access when a page fault occurs estimate the value of the fault rate must be less than.
Suppose the average page fault service time is 20 milliseconds and memory access time is 200 nanoseconds. Assuming we wish to have less than 10% degradation in memory acc...
gidoranking
839
views
gidoranking
asked
Jul 2, 2018
Operating System
operating-system
virtual-memory
+
–
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