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Recent questions tagged memory-management

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operating system
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Memory allocation
In an multiprogramming fixed partitioning the number of partitions are fixed or size of partitions are fixed please explain
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Memory techniques
Fixed partitioning for contiguous memory allocation suffers from external fragmentation or not please explain with example
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Self doubt
How to understand that no. of entries in inverted page table is equal to no of frames in physical address space?
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advantages of segmented paging over pure paging
As we know segmented paging is an improvement over segmentation and paging but I am having some doubts regarding the memory overhead of these three system.It ... than pure paging and also extra segmentation table is required in this system?
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Made easy test series
A demand paging system has page fault service time as 125 time units if page is not dirty and 400 times units of page fault service time if it is a dirty page. ... 50 time units. Then, the value of P is ______? [upto four decimal places]
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Paging
A computer system has a 36-bit virtual address space with a page size of 8K, and 4 bytes per page table entry. What is the maximum size of addressable physical memory in this system?
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UGC NET CSE | December 2008 | Part 2 | Question: 40
Which of the following $OS$ treats hardware as a file system?$UNIX$ $DOS$ $Windows$ $NT$ None of the above
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UGC NET CSE | December 2009 | Part 2 | Question: 39
A program is located in the smallest available hole in the memory is _________(A) best – fit(B) first – bit(C) worst – fit(D) buddy
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Basic page table question
Consider a system implementing a 2 level page table. Memory access time = 10ns. Hit ratio of page table = 0.3. Page fault access time = 50ns.What is average ... as we need to access 2 page tables first and then access main memory for hit ?
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[OS] Compile time vs load time address binding
Why logical address and physical address are same in case of compile and load time binding ?In complie time as i have read compiler will generate absoute address ... Logical address can be anything?Why it has ti be same as physical address?
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Buddy System
on a system with 1MB of memory using the buddy system what is the first requests due to lack of available memory ? 50k,150k,90k,130k,70k,80k,120k,180k,60k.?
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Multi level paging
Im confused with multi level pagingAs per my understanding the outer most page table must be in main memory and not all inner page tables to be in memory ... be their Even then why we are using multi level pagingPlease can someone help me
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Memory Management
What is the difference between the functions performed in compile time and functions performed in link time?
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Memory Management
What is the difference between Physical Address, Virtual Address and Absolute Address?
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Related to page frame
n a 32 bit processor the virtual address is 22 bit:12 bit(Table index : Offset). What is the size of the page frame and the process page table assuming that each entry in the page table is 4 Bytes?
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geeksforgeeks
A computer system supports 32-bit virtual addresses as well as 32-bit physical addresses. Since the virtual address space is of the same size as the physical ... longer neededDCPU scheduling can be made more efficient now. GATE-CS-2006
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Paging
Who determines the size of the page table (or to be precise size of virtual address space) for any process?is it operating system or ISA or something else?
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Test by Bikram | Computer Organization and Architecture | Test 2 | Question: 24
A byte addressable computer can support maximum of $2^i$ KB memory and has $2^j$ instructions. An instruction involving $2$ operands and $1$ operator needs how many bits ?$3i$2i + j$2i + j + 20$i + j$
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Test by Bikram | Mock GATE | Test 4 | Question: 22
What is the technique that allows one to execute a program which is not entirely in memory called?Demand PagingAuxiliary MemorySecondary MemoryVirtual Memory
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General question
Difference between logical address and physical address.M getting so confused between this two. Sometimes it is mentioned that logical address is what viewd by ... generated by the CPU.Explain in simple language not bookies words. Thanks.
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Internal organization of memory chip.
What are external connection in "internal organization of memory chip" ? How these lines are decided ?Example memory with 128 bits (16×8) requires 14 external connections.How we decided this ☝ ?
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Memory Management
A $1$TB Disk with $4$-KB blocks require $32$MB to store its bit map?Kindly explain how.
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malloc
What does the following exactly mean?int *p=(int*)malloc(23);Does it mean that the OS allocates a memory of 23 bytes to int(though it requires just 4 bytes)? I ... as 4. Why? Should'nt it return 23 since that's what the memory I allocated?
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How does memory layout of a program depend on address binding technique?
I have learned that with run-time address binding, the program can be allocated frames in the physical memory non-contiguously. Also, as described here and here, ... of the segments or separately just as in the case of run-time binding ?
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Virtual Memory
Consider the following passage to answer questions from Q. Nos. 1 to 6 :Virtual Memory is a technique that allows the execution of processes that maynot be completely in the ... B) 10 page faults(C) 14 page faults (D) 12 page faults
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Throughput of memory system---urgent
How to calulate the Throughput of memory system when average access time is given
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byron gottfried programming in c (schaum's outline) pageno:302 and 303
i wanted to intialize a 2d array using pointers to pointers and i wrote the following code i know the below code is lot of hardcoding but as i am a ... "\n"); } return 0; } https://gateoverflow.in/?qa=blob&qa_blobid=17604332813334679423
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frame size != page size
Consider a system with 2 level paging applicable the page table is divided into 8K pages each of size 16KB. The memory is byte addressable if the physical address ... inner and outer page table.How can frame size and page size be unequal?
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demand paging
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