At any time, the set of pages with n frames
    is a subset of the set of pages for n+1 frames

Thrashing

• Effect of degree of multiprogramming on CPU Utilization
• What happens when the former is raised to a very high value?
• Process spends more time in page faults than in execution
• Situations in which thrashing can occur
• Minimum no. of frames that must be allocated to a process
• Rise in Page Fault Rate
• Corrective actions

• Study of Locality of Page references
• Working window Size
• The working set : an approximation for locality
• What happens if no. of memory frames < total working set requirements?
• Working set allocation and the thrashing behavior