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Answer Posted / neha kela
Thrashing:-
If the process does not have number of frames it needs to support pages in active use, it will quickly page-fault. The high paging activity is called thrashing.
In other words we can say that when page fault ratio decreases below level, it is called thrashing.
Causes:-
1) If CPU utilization is too low then we increase the degree of multiprogramming by introducing a new process to the system. A global page replacement algorithm is used. The CPU scheduler sees the decreasing CPU utilization and increases the degree of multiprogramming.
2) CPU utilization is plotted against the degree of multiprogramming.
3) As the degree of multiprogramming increases, CPU utilization also increases.
4) If the degree of multiprogramming is increased further, thrashing sets in and CPU utilization drops sharply.
5) So, at this point, to increase CPU utilization and to stop thrashing, we must decrease the degree of multiprogramming.
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