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Recent questions tagged virtual-memory

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TANCET 2016 VIRTUAL MEMORY
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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 ta...
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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...
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Virtual Memory
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Self doubt
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...
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Galvin #OS Please explain this diagram from VM.
What exactly is happening here? I can't figure out the arrows!
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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 (f...
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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 o...
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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...
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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 d...
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Virtual Memory
How we can improve size of virtual memory?
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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 pag...
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Memory References
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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 i...
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Virtual Memory
Virtual memory increases degree of multiprogrammingVirtual memory decreases degree of multiprogrammingDegree of multiprogrammoing means number of process is in memory. ...
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Virtual Memory
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Virtual Memory
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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...
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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 beA)N. ...
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Ace Test Series: Operating System - Virtual Memory And Paging
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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 acc...
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Memory mapped files
Please explain the concept of memory mapped files in OS. Is it really in GATE 2019 Syllabus?
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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 physi...
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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...
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caching and virtual memory
I am having troble with these following questions. Please I need help
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Operating System By Harris
Assume the amount of memory on a system is inversely proportional to page fault rate. Each time when memory doubles the page fault rate is reduced by third. Currently sys...
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Virtual Memory
Say i have a Cache with hit ratio 96% and access time 1ns and a memory with access time 10 ns Now by default we go for Sequential access instead of ParallelNow... Tavg =...
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Virtual Memory
I have some doubt please listen me out an point where I am wrong if i am wrong..Let's say I have a physically addressed cache, a TLB and 2 level page table memory.(page ...
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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 ...
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