PPT Slide
Thrashing & Load Control
- A better metric for VM performance is the page fault rate. If the page fault rate increases, decrease the level of multiprogramming by swapping out processes. If the page fault rate decreases, increase the level of multiprogramming by swapping in processes.
- Swapping: the entire process address space is moved to the paging disk. A swapped-out process has no page frames assigned to it and cannot be scheduled to the run state.
- Swapping involves higher degrees of process control and is usually scheduled separately.