SCIA 360 Chapter 3

Pregunta	Respuesta
The optimal selection of cache size and replacement algorithm can result in 80 to 90 percent of all requests being in the cache. a. True b. False	a. True
The primary advantage of storing programs in noncontiguous locations is that ____. a. multiple programs can run at the same time b. every program will be able to run c. secondary storage is accessed more quickly d. main memory is used more efficiently	d. main memory is used more efficiently
In a paged memory allocation scheme, the ____ contains two values for each active job: the size of the job and the memory location where its Page Map Table is stored. a.Memory Management Table b. Job Table c. Page Access Table d. Memory Map Table	b. Job Table
In a paged memory allocation scheme, a simple ____ has one entry for each page frame that shows its location and its free/busy status. a. Memory Management Table b. Job Table c. Page Access Table d. Memory Map Table	d. Memory Map Table
In a paged memory allocation scheme, a page size that is too small will generate ____. a. very long Page Map Tables b. excessive internal fragmentation c. excessive page faults d. excessive external fragmentation	a. very long Page Map Tables
In demand paging, pages are ____ between main memory and secondary storage. a. swapped b. traded c. allocated d. faulted	a. swapped
In demand paging, when an excessive number of pages are moved back and forth between main memory and secondary storage, it is called ____. a. swapping b. faulting c. paging d. thrashing	d. thrashing
The ____ page replacement policy is based on the theory that the best page to remove is the one that has been in memory the longest. a. TRU b. LRU c. LIFO d. FIFO	d. FIFO
The ____ demonstrates that when using a FIFO policy, in rare cases, adding more memory to a system can cause an increase in page interrupts. a. Paging Anomaly b. Belady Anomaly c. Interrupt Anomaly d. Laszlo Anomaly	b. Belady Anomaly
A variation of the LRU page replacement algorithm known as the ____ replacement policy is implemented with a circular queue. a. clock page b. round robin c. performance page d. bit shifting	a. clock page
In demand paging schemes, the ____ in a Page Map Table indicates whether the page is currently in memory. a. referenced bit b. modified bit c. memory bit d. status bit	d. status bit
In demand paging, the collection of pages residing in memory that can be accessed directly without incurring a page fault is called the ____. a. page set b. working set c. job set d. denning set	b. working set
The term “____” means that during any phase of its execution, a program references only a small fraction of its pages. a. dynamic paging b. structured programming c. locality of reference d. working set	c. locality of reference
With segmented memory allocation, each job is divided into several ____ of different sizes, one for each module that contains pieces that perform related functions. a. pages b. modules c. segments d. partitions	c. segments
To access a location in memory when using segmented memory management, the address is composed of two entries: ____. a. the segment number and the line number b. the segment number and the displacement c. the line number and the displacement d. the segment number, the line number, and the displacement	b. the segment number and the displacement
A disadvantage of segmented memory allocation is ____. a. the physical size requirements of main memory b. the number of page faults c. internal fragmentation d. external fragmentation	d. external fragmentation
____ effectively removes restrictions on maximum program size. a. Segmenting b. Virtual memory c. Shared memory d. Multithreading	b. Virtual memory
____ can be thought of as being an intermediary between main memory and the special-purpose registers, which are the domain of the CPU. a. Virtual memory b. Cache memory c. Paging d. Segmenting	b. Cache memory
The purpose of cache memory is to keep handy the most recently accessed data and instructions so that the CPU can access them repeatedly without wasting time. This purpose is similar to that of the ____ of a Web browser. a. cache file b. bookmark file c. page file d. block file	b. bookmark file
Cache memory is divided into blocks of equal size called ____. a. slots b. pages c. segments d. partitions	a. slots

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