Thrashing
1997
Thrashing
- A.
reduces page I/O
- B.
decreases the degree of multiprogramming
- C.
implies excessive page I/O
- D.
improves system performance
Attempted by 33 students.
Show answer & explanation
Correct answer: C
Thrashing occurs in a paged virtual-memory system when processes do not have enough page frames for their working sets. This causes a very high page-fault rate.
As pages are repeatedly brought from disk and replaced again, the system performs excessive page I/O and spends little time executing the actual processes.
Therefore, thrashing implies excessive page I/O. Reducing the degree of multiprogramming may help control thrashing, but it is not the meaning of thrashing itself.