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The following,____, describes the first memory allocation scheme.
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Chapter 2 OSystems
Chapter 2 questions PCOS
Question | Answer |
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The following,____, describes the first memory allocation scheme. | Each program to be processed was loaded in its entirety into memory and allocated as much contiguous space in memory as it needed |
In a single-user system, jobs are processed ____. | sequentially |
In the algorithm to load a job in a single-user system, the program counter is initially set to ____. | the address of the first memory location |
Fixed partitions are also called ____ partitions. | static |
____ is the first step in the algorithm to load a job in a fixed partition. | Determining the job’s requested memory size |
In the partition scheme, the table that the Memory Manager uses to keep track of jobs is composed of the ____. | partition size, memory address, access, and status |
The fixed partition scheme works well ____. | when jobs have the same size |
____ consists of fragments of free memory between blocks of allocated memory. | External fragmentation |
The ____ keeps the free/busy lists organized by memory locations, low-order memory to high-order memory. | first-fit memory allocation |
____ has the least wasted space and the smallest partition fitting the requirements. | Best-fit memory allocation |
____ is how memory is deallocated in a fixed partition scheme. | Memory Manager resets the status of the memory block where the job was stored to “free.” |
In a dynamic partition scheme, ____, is how the Memory Manager deallocates a block that is between two other free blocks. | the sizes of the three free partitions must be combined |
When memory is deallocated, an entry can be removed from the free list by creating a(n) ____. | null entry |
A(n) ____ in the busy list occurs when a memory block between two other busy memory blocks is returned to the free list. | null entry |
The ____ of memory, sometimes referred to as garbage collection or defragmentation, is performed by the operating system to reclaim fragmented sections of the memory space. | compaction |
The operating system can tell the ____ of each group of digits by its location in the line and the operation code. | function |
The ____ contains the value that must be added to each address referenced in the program so it will be able to access the correct memory addresses after relocation. | relocation register |
____ is the actual memory address for a job that starts at 18K | 18,432 |
By compacting and relocating, the Memory Manager optimizes the use of memory and thus improves throughput, but an unfortunate side effect is more ____. | overhead |
One approach to performing compaction is to do it when a certain ____ of memory becomes busy. | percentage |