The objective of this exercise is to count the number of page faults generated b

Question

The objective of this exercise is to count the number of page faults generated by a program. We assume a pure on demand paging system with a page size of 128 bytes. We also assume that the counter variable I is in a register and that the code must be loaded in a separate frame. The size of the code is 172 bytes. We assume that 4 frames are allocated to this program. The program is:

char aString[1024];

int main(){

int i; for (i = 0; i <= 1024)

sString[i] = ‘a’;

}

i. What is the string of references that this program will generate when accessing data?

ii. How many page faults in total (code and data) will happen? Ju

Explanation / Answer

Solution:

i)

A request will be made to fetch 'a' from the memory to initialize it in aString[] array.

ii)

the loop is running 1025 times, this means 1025 write operations will be done.

FIrst access will be a page fault and after that, all 1024 accesses will be a hit.

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