Help needed, urgently - from Computer Science people

[Tango Charlie]

Dosto
I need solutions to following questions very ugently. I m sick so not able to get hold of them.
Is there anybody who knows Operating System subject well or can get help from their professor.
I hope there are lot of B.Tech guys here who can help me :-
Need answers in a day or two urgently .
Questions are:-
1. Consider a logical address space with 16 pages of 512 bytes each mapped onto a physical memory of 8 frames.
i. How many bits are there in the logical address space? [4]
ii. How many bits are there in the physical address space? [4]
iii. How many entries are there in the page table? [2]
2. Why are page sizes always the powers of two? [5]
3. A computer system has 1M of memory, with the OS requiring 200K, each user program 200K
and an average of 85% average I/O wait. All user processes in the memory are contending for
the CPU.
i. What is the CPU utilization? (ignore the OS overhead) [5]
ii. What is a best way to improve CPU utilization either adding 1M of additional memory or
changing to fast I/O device with average wait of 95%? [5]
4. Consider the following page reference string: 1, 2, 3, 4, 1, 3, 5, 6, 2, 1, 3, 7, 3, 6, 2, 1, 2, 3, 6.
Assume that there are four initially empty frames, how many page faults would occur for the
following replacement algorithms?
i. LRU replacement [5]
ii. FIFO replacement [5]

[AdhuraPyaar]

Originally Posted by Tango Charlie Dosto I need solutions to following questions very ugently. I m sick so not able to get hold of them. Is there anybody who knows Operating System subject well or can get help from their professor. I hope there are lot of B.Tech guys here who can help me :- Need answers in a day or two urgently . Questions are:- 1. Consider a logical address space with 16 pages of 512 bytes each mapped onto a physical memory of 8 frames. i. How many bits are there in the logical address space? [4] ii. How many bits are there in the physical address space? [4] iii. How many entries are there in the page table? [2] 2. Why are page sizes always the powers of two? [5] 3. A computer system has 1M of memory, with the OS requiring 200K, each user program 200K and an average of 85% average I/O wait. All user processes in the memory are contending for the CPU. i. What is the CPU utilization? (ignore the OS overhead) [5] ii. What is a best way to improve CPU utilization either adding 1M of additional memory or changing to fast I/O device with average wait of 95%? [5] 4. Consider the following page reference string: 1, 2, 3, 4, 1, 3, 5, 6, 2, 1, 3, 7, 3, 6, 2, 1, 2, 3, 6. Assume that there are four initially empty frames, how many page faults would occur for the following replacement algorithms? i. LRU replacement [5] ii. FIFO replacement [5]

veere main aina question da answer ta de dainda je mere kol theory di koi knowledge hundi par mere kol ta sirf practical knowledge ae.

[Tango Charlie]

Originally Posted by adhurapyaar veere main aina question da answer ta de dainda je mere kol theory di koi knowledge hundi par mere kol ta sirf practical knowledge ae.

try kar yaar , ask some proffessor. mainu zaroori chahide ne answers

[AdhuraPyaar]

Originally Posted by Tango Charlie try kar yaar , ask some proffessor. mainu zaroori chahide ne answers

veere pata kr dainda pr sade teacher te saada dost itlay chala gaya hai

[Administrator]

tc call me on monday - i will connect you to my main laptop service engineer - he might be able to answer a few queries