Operating System Multiple Choice Questions on “File System Implementation – Performance”.
1. _______ tend to represent a major bottleneck in system performance.
a) CPUs
b) Disks
c) Programs
d) I/O
Answer: b
2. In UNIX, even an ’empty’ disk has a percentage of its space lost to ______
a) programs
b) inodes
c) virtual memory
d) stacks
Answer: b
3. By preallocating the inodes and spreading them across the volume, we ___________ the system performance.
a) improve
b) decrease
c) maintain
d) do not affect
Answer: a
4. ____________ writes occur in the order in which the disk subsystem receives them, and the writes are not buffered.
a) Asynchronous
b) Regular
c) Synchronous
d) Irregular
Answer: c
5. In ___________ writes, the data is stored in the cache.
a) Asynchronous
b) Regular
c) Synchronous
d) Irregular
Answer: a
6. A file being read or written sequentially should not have its pages replaced in LRU order, because _____________
a) it is very costly
b) the most recently used page will be used last
c) it is not efficient
d) all of the mentioned
Answer: b
Clarification: None.
7. In the optimized technique for sequential access ___________ removes a page from the buffer as soon as the next page is requested.
a) write ahead
b) read ahead
c) free-behind
d) add-front
Answer: c
Clarification: None.
8. With _______ a requested page and several subsequent pages are read and cached.
a) write ahead
b) read ahead
c) free-behind
d) add-front
Answer: b