Consider a demand-paging syste

The system obviously is spending most of its time paging,
indicating over-allocation of memory. If the level of multiprogramming
is reduced resident processes would page fault less frequently and the
CPU utilization would improve. Another way to improve performance
would be to get more physical memory or a faster paging drum.
a. Get a faster CPU—No.
b. Get a bigger paging drum—No.
c. Increase the degree of multiprogramming—No.
d. Decrease the degree of multiprogramming—yes

e.Install more main memory— Likely to improve CPU utilization as more pages can remain resident and not require paging to or from the disks
f.Install a faster hard disk, or multiple controllers with multiple hard disks—Also an improvement, for as the disk bottleneck is removed by faster response and more throughput to the disks, the CPU will get more data more quickly.
g.Add prepaging to the page fetch algorithms — Again, the CPU will get more data faster, so it will be more in use. This is only the case if the paging action is amenable to prefetching (i.e., some of the access is sequential).
h.Increase the page size—lncreasing the page size will result in fewer page faults if data is being accessed sequentially. If data access is more or less random, more paging action could ensue because fewer pages can be kept in memory and more data is transferred per page fault. So this change is as likely to decrease utilization as it is to increase it.