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Recent questions tagged memory-management
0
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271
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
406
views
mauro5991
asked
Aug 2, 2018
CO and Architecture
virtual-memory
cache-memory
co-and-architecture
memory-management
multilevel-cache
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3
votes
1
answer
272
Made Easy: Memory allocation
Consider 900 KB memory is managed using variable partitions but no compaction. It currently has three process occupied partition of sizes 212 KB, 114 KB and 100 KB respectively. What is the smallest allocation request that could be denied?
Consider 900 KB memory is managed using variable partitions but no compaction. It currently has three process occupied partition of sizes 212 KB, 114 KB and 100 KB respec...
kapilbk1996
2.7k
views
kapilbk1996
asked
Jul 28, 2018
Operating System
operating-system
memory-management
made-easy-test-series
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0
votes
0
answers
273
Size of Page Table (Numerical)
Consider a system with byte-addressable memory, 32 bit logical addresses, 4 kilobyte page size and page table entries of 4 bytes each. The size of the page table in the system in bytes is __________________
Consider a system with byte-addressable memory, 32 bit logical addresses, 4 kilobyte page size and page table entries of 4 bytes each. The size of the page table in the s...
srestha
681
views
srestha
asked
Jul 26, 2018
Operating System
paging
operating-system
memory-management
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–
1
votes
2
answers
274
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
275
Memory References
Na462
444
views
Na462
asked
Jul 19, 2018
Operating System
memory-management
operating-system
virtual-memory
+
–
1
votes
2
answers
276
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
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–
0
votes
1
answer
277
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
1.9k
views
srestha
asked
Jul 12, 2018
Operating System
virtual-memory
operating-system
memory-management
+
–
0
votes
1
answer
278
Virtual Memory
Na462
542
views
Na462
asked
Jul 12, 2018
Operating System
virtual-memory
operating-system
memory-management
paging
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–
0
votes
1
answer
279
Virtual Memory
Na462
778
views
Na462
asked
Jul 12, 2018
Operating System
virtual-memory
operating-system
memory-management
paging
+
–
0
votes
1
answer
280
Made easy workbook
Q-1
Q-1
Avik Chowdhury
433
views
Avik Chowdhury
asked
Jul 7, 2018
Operating System
memory-management
+
–
–1
votes
1
answer
281
Made easy workbook
What is the size of largest segment?
What is the size of largest segment?
Avik Chowdhury
545
views
Avik Chowdhury
asked
Jul 7, 2018
Operating System
memory-management
+
–
0
votes
1
answer
282
Made easy Workbook
Q-32
Q-32
Avik Chowdhury
392
views
Avik Chowdhury
asked
Jul 7, 2018
Operating System
memory-management
+
–
0
votes
2
answers
283
Made easy Workbook
Q-29
Q-29
Avik Chowdhury
408
views
Avik Chowdhury
asked
Jul 7, 2018
Operating System
memory-management
+
–
0
votes
1
answer
284
Made easy Workbook
Avik Chowdhury
344
views
Avik Chowdhury
asked
Jul 7, 2018
Operating System
memory-management
+
–
0
votes
2
answers
285
Made easy workbook
A System uses a two level page table has 2^12 bytes pages and 32 bit virtual adresses .The first 8 bit of the address serve as a index into the first level page table.For 64 bit virtual addresses,a 4kb page size and 256 mb of RAM an inverted page table requires A)2^40 entries. B)2^52 entries C)2^16 entries. D)2^78 entries
A System uses a two level page table has 2^12 bytes pages and 32 bit virtual adresses .The first 8 bit of the address serve as a index into the first level page table.For...
Avik Chowdhury
965
views
Avik Chowdhury
asked
Jul 7, 2018
Operating System
memory-management
+
–
0
votes
0
answers
286
Doubt of Page Table
Can I calculate Page Table Size by just multiplying No. Of Pages & Frame No. if PTE size is not given?
Can I calculate Page Table Size by just multiplying No. Of Pages & Frame No. if PTE size is not given?
mrinmoyh
395
views
mrinmoyh
asked
Jul 7, 2018
Operating System
memory-management
paging
operating-system
+
–
0
votes
1
answer
287
Memory mapped files
Please explain the concept of memory mapped files in OS. Is it really in GATE 2019 Syllabus?
Please explain the concept of memory mapped files in OS. Is it really in GATE 2019 Syllabus?
Na462
315
views
Na462
asked
Jun 22, 2018
Operating System
operating-system
virtual-memory
memory-management
+
–
1
votes
1
answer
288
Virtual memory
How does the virtual memory separates the logical memory as perceived by users from physical memory? Is it because we can load program with larger address space then physical memory but still we need physical memory to load our pages don't we ? Then what does the above statement actually trying to convey ?
How does the virtual memory separates the logical memory as perceived by users from physical memory?Is it because we can load program with larger address space then physi...
Na462
1.1k
views
Na462
asked
Jun 20, 2018
Operating System
operating-system
virtual-memory
memory-management
+
–
1
votes
1
answer
289
Hierarchical Page Table
Given 64 bit logical space, Page Size = $4KB$. Do the three level paging? My Solution:- 1. Since address space is =$ 2^{64} Bytes$ Page size = $2^{12}$ Bytes. Number of entries in third level Page table is :- $2^{64} / 2^{12}$ = $2^{52}$. Size ... as:- $1st$ level $2nd$ level $3rd$ level Offset $ 32$ $10$ $10$ $12$ Please explain how did they find this out ? Please :)
Given 64 bit logical space, Page Size = $4KB$. Do the three level paging? My Solution:-1. Since address space is =$ 2^{64} Bytes$ Page size = $2^{12}$ Bytes. Numb...
Na462
1.6k
views
Na462
asked
Jun 19, 2018
Operating System
memory-management
paging
+
–
1
votes
3
answers
290
MadeEasy Test Series: Operating System - Memory Management
Consider a machine with byte addressable memory 32 bits virtual addresses, 32 bits physical addresses and 4 KB page size. If a two-level page table system is used where each page table occupies one page and page table entries of 4 B each, then the memory overhead for this machine is ________ KB please explain.
Consider a machine with byte addressable memory 32 bits virtual addresses, 32 bits physical addresses and 4 KB page size. If a two-level page table system is used where e...
Nancy Pareta
2.4k
views
Nancy Pareta
asked
Jun 12, 2018
Operating System
made-easy-test-series
operating-system
memory-management
+
–
1
votes
2
answers
291
memory management
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 an associative memory which holds 32 (virtual page, ... frame) pairs and can do look up in 100 nsec. What hit rate is needed to reduce the mean overhead to 200 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 500 ns...
priyanka manwani
4.2k
views
priyanka manwani
asked
Jun 8, 2018
Operating System
memory-management
operating-system
+
–
1
votes
1
answer
292
self- doubt
when the process completes its execution then 1. its some pages still present in a frame(main memory) and replace according to demand 2. all of sudden all the pages erase out from main memory after process completion. Which statement is true?
when the process completes its execution then1. its some pages still present in a frame(main memory) and replace according to demand2. all of sudden all the pages erase o...
Raj Kumar 7
309
views
Raj Kumar 7
asked
Apr 30, 2018
Operating System
operating-system
memory-management
paging
+
–
1
votes
1
answer
293
Paging
In multi-level paging, a big page table is divided into smaller pages and for those pages (of main page table) a new page table is created. So what be basically did is broke down the main page table into small pieces (usually so to reduce the size of parts to page size). But, the overall size of the main page table remain same, right? Then what actually is the benefit of multilevel paging?
In multi-level paging, a big page table is divided into smaller pages and for those pages (of main page table) a new page table is created. So what be basically did is br...
Ankit Sahu
926
views
Ankit Sahu
asked
Apr 26, 2018
Operating System
multilevel-paging
operating-system
paging
memory-management
virtual-memory
+
–
4
votes
3
answers
294
ISRO2018-22
A computer has $1000K$ of main memory. The jobs arrive and finish in the following sequence. Job $1$ requiring $200$ $K$ arrives Job $2$ requiring $350$ $K$ arrives Job $3$ requiring $300$ $K$ arrives Job $1$ finishes Job $4$ requiring $120$ ... $K$ arrives Among best fit and first fit, which performs better for this sequence? First fit Best fit Both perform the same None of the above
A computer has $1000K$ of main memory. The jobs arrive and finish in the following sequence. Job $1$ requiring $200$ $K$ arrives Job $2$ requiring $350$ $...
Arjun
2.7k
views
Arjun
asked
Apr 22, 2018
Operating System
isro2018
memory-management
fragmentation
operating-system
+
–
1
votes
7
answers
295
ISRO2018-61
The Operating System of a computer may periodically collect all the free memory space to form contiguous block of free space. This is called: Concatenation Garbage Collection Collision Dynamic Memory Allocation
The Operating System of a computer may periodically collect all the free memory space to form contiguous block of free space. This is called:ConcatenationGarbage Collecti...
Arjun
2.7k
views
Arjun
asked
Apr 22, 2018
Operating System
isro2018
memory-management
operating-system
+
–
0
votes
1
answer
296
Logical Address in Paging
In paging, we know that the no. of bits for page offset is same and depends upon the size of the page size. However, the rest of the bits of the logical address somehow determines the no. of pages of the process and thus the size of ... offset (constant) ) and thus two process of different sizes have different length logical addresses? Is it the scenario where we use PTLR?
In paging, we know that the no. of bits for page offset is same and depends upon the size of the page size. However, the rest of the bits of the logical address somehow d...
Harsh Kumar
717
views
Harsh Kumar
asked
Apr 17, 2018
Operating System
paging
operating-system
memory-management
+
–
0
votes
1
answer
297
Self doubt
Explain Last In First Out (LIFO) and MRU with this example and find a number of a page fault. Question: Let the number of the frame in main memory is 5. Reference String: 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10
Explain Last In First Out (LIFO) and MRU with this example and find a number of a page fault.Question:Let the number of the frame in main memory is 5.Reference String: ...
Raj Kumar 7
265
views
Raj Kumar 7
asked
Apr 13, 2018
Operating System
operating-system
memory-management
+
–
0
votes
1
answer
298
self - doubt
Physical memory are divide into frame. The frame of each size are equal. Is the word size in each frame same or it may possible to different in size ? (I am taking about word size in two different frame in main memory. )
Physical memory are divide into frame. The frame of each size are equal. Is the word size in each frame same or it may possible to different in size ?(I am taking abou...
Raj Kumar 7
262
views
Raj Kumar 7
asked
Apr 8, 2018
Operating System
operating-system
memory-management
+
–
0
votes
0
answers
299
Secondary memory
Prince Sindhiya
1.1k
views
Prince Sindhiya
asked
Apr 6, 2018
CO and Architecture
memory-management
+
–
2
votes
1
answer
300
DMRC AM-IT, Virtual memory
The lookup page table shown below is for a job in a paged virtual storage system with a page size of 1024 locations. Each virtual address is in the form [p,d] where p is page number and d is displacement in the page. Virtual page Actual page 0 3 1 --- 2 4 3 0 A virtual address of [0,514] maps to an actual address of A) 512 B)1538 C)3586 D)4514
The lookup page table shown below is for a job in a paged virtual storage system with a page size of 1024 locations. Each virtual address is in the form [p,d] where p is ...
Lalit Verma
2.6k
views
Lalit Verma
asked
Mar 31, 2018
Operating System
virtual-memory
paging
operating-system
memory-management
+
–
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