Compute the effective instruction time on the system, Operating System

Assignment Help:

Q. An operating system sustains a paged virtual memory using a central processor with a cycle time of 1 microsecond. It costs an additional one microsecond to access a page other than the current one. Pages have 1000 words as well as the paging device is a drum that rotates at 3000 revolutions per minute and transfers one million words per second. The subsequent statistical measurements were obtained from the system:

  • One percent of all instructions implemented accessed a page other than the current page.
  • An instructions that accessed another page 80 percent accessed a page already in memory.
  • When a fresh page was required the replaced page was modified 50 percent of the time.

Compute the effective instruction time on this system assuming that the system is running one process only in addition to that the processor is idle during drum transfers.

Answer:

Effective access time                                                  = 0.99 × (1 μ sec + 0.008 × (2 μ sec)

+ 0.002 × (10,000 μ sec + 1,000 μ sec)

+ 0.001 × (10,000 μ sec + 1,000 μ sec)

= (0.99 + 0.016 + 22.0 + 11.0) μ sec

= 34.0 μ sec


Related Discussions:- Compute the effective instruction time on the system

What is time-stamping, time-stamping It is a method proposed by Lampor...

time-stamping It is a method proposed by Lamport, used to sequencing events in a distributed machine without the use of clocks. This process is intended to order events consis

Multiprogramming, what are the main advantages of multiprogramming

what are the main advantages of multiprogramming

File system, what are disadvantages of using single directory

what are disadvantages of using single directory

Explian reference string, What is reference string We evaluate an algor...

What is reference string We evaluate an algorithm by running it on a definite string of memory reference and computing the number of page faults. The string of memory reference

Kernel, 1. What must a kernel provide for an effective user-level thread im...

1. What must a kernel provide for an effective user-level thread implementation? 2. With respect to the quantum q in a scheduling algorithm, explain and discuss the impact of the

Define a program that is in execution is known as, Define a program in exec...

Define a program in execution is known as A program in execution is known as a process

Deadlocks, At the end of this lecture, and into the next lecture, we will d...

At the end of this lecture, and into the next lecture, we will discuss the last major type of logical error that can occurwhen programming with threads. A deadlock occurswhen two t

Determine the scheduling technique, The scheduling technique in which CPU i...

The scheduling technique in which CPU is allocated to the process with least CPU-burst time is known as  Shortest job first Scheduling is a scheduling technique in which CPU i

What are the differences between process and thread, What are the differenc...

What are the differences between process and thread? The fundamental difference between a process and a thread is that a process has an entire copy of the program to itself and

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd