A system takes on average 10 ms to service a page fault and

A system takes on average 10 ms to service a page fault and has a memory access time of 100 nanoseconds If the effective access time of the system is to be 250 Nano seconds, what percent of memory accesses can result in a page fault? A system takes on average 10 ms to service a page fault and has a memory access time of 100 nanoseconds If the effective access time of the system is to be 250 Nano seconds, what percent of memory accesses can result in a page fault?

Solution

Let x be the percent of page faults

10000000 * x + 100 (1-x)= 250

9999900 x = 150

x = 0.000015 = 0.0015%