30 Questions
Which register holds the smallest legal physical memory address?
Base register
What does the limit register specify?
Size of the range
What is the maximum physical address in the given figure?
1024000
What is a process's view of its own memory called?
Logical (virtual) address space
Which register can be loaded only by the operating system?
Base and limit registers
What does the CPU check for every memory access generated in user mode?
If it is between base and limit for that user
Which of the following is a main memory hardware organization technique discussed in the text?
Cache
What is the purpose of the base and limit registers mentioned in the text?
To determine the range of legal addresses that a process may access
Which of the following is true about main memory access?
Main memory is accessed via a transaction on the memory bus
What is the purpose of memory protection mentioned in the text?
To protect user processes from one another
What is the purpose of cache in memory management?
To improve memory access speed
What is an address space in memory management?
The memory space used and accessed by a process during its execution
Which memory allocation technique limits the degree of multiprogramming by the number of partitions and allocates variable partition sizes based on a process' needs?
Dynamic partitioning
Which fragmentation occurs when the memory blocks cannot be allocated to processes due to their small size, resulting in inefficient use of memory?
External fragmentation
Which solution involves shifting processes so that they are contiguous, consolidating free memory into one block?
Compaction
What is the purpose of virtual memory?
To manage the movement of pages and segments
What memory-management scheme divides physical memory into fixed-sized blocks called frames and divides the address space into blocks of the same size called pages?
Paging
What must hardware support and the operating system include for virtual memory to be practical and effective?
Movement of pages and segments
Which of the following is true about the page table in a paging system?
All of the above.
What is the purpose of the page number in the address translation scheme?
It is used as an index into the page table.
In a paging system, what is the purpose of the page offset?
It is combined with the base address to access the memory unit.
In a paging system with a logical address space of 2m and a page size of 2n, what is the formula to calculate the number of pages?
2^(m+n)
What is the formula to calculate the page number and page offset given a logical address and page size?
Page number = Logical Address/Page Size, Offset = Address - (Page number * Page Size)
What is the disadvantage of using straightforward methods for memory structures in paging?
The memory structures can become too large.
Which of the following is an advantage of segmented paging?
Segment table has only one entry corresponding to one actual segment.
What is a characteristic of hashed page tables?
Each element in the hash table has a linked list of elements hashing to the same location.
What are the fields present in each element of a hashed page table?
Virtual Page Number, Value of the Mapped Page Frame, Pointer to the Next Element
What is the purpose of using hashed page tables?
To avoid collisions in the page table.
What is the virtual page number in a hashed page table?
The bits that are not a part of the page offset.
What is the limitation of page table size in segmented paging?
It is limited by the size of the segment table.
Test your knowledge on dynamic partitioning and multiple-partition allocation in operating systems. Explore the concepts of allocating memory to processes and the limitations of degree of multiprogramming. Learn about variable-partition sizes for improved efficiency.
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