Time slice, Computer Engineering

Assignment Help:

The Linux Process Scheduler uses time slice to prevent a single process from using the CPU for too long. A time slice specifies how long the process can use the CPU. In our simulation, the minimum time slice possible is 10ms and the maximum time slice possible is 300 ms. The scheduler assigns higher time slices to processes that are more interactive and lower time slices to processes that are more CPU intensive. Note that time slice is a positive integer in this range [10, 300]. To calculate the time slice, we use this formula:

2160_Time slice.png

Each process is supplied with a priority level that ranks a process based on their worth and need for processor time. The priority levels range from 100 to 140 [100,140]. Processes with a lower priority will run before a process with a higher priority. Process with a lower priority level also receives a longer time slice. A process's initial priority (sometimes called static priority) is calculated based on its nice value. Nice values range from -20 to +19 [-20, 19] indicating how nice the process is. Larger nice values correspond to a lower priority. CPU intensive processes typically have higher nice values while IO bound processes have lower nice values. Nice values are provided with the input file. Note that a priority value is a positive integer in this range

[100,140]. To calculate the initial (or static) priority we use this formula:

2269_Time slice1.png

After a process exhausts its time slice, it will join the expired queue or go back to the active queue. Before doing that, it has to calculate its new priority (sometimes called the dynamic priority). This is the formula used to calculate the dynamic priority:

priority = original priority + bonus:

865_Time slice2.png

Bonus points are given to processes that either use too much or too little CPU time. Bonus points are integers range from -5 to +5 ([-5, 5]). Here are the guidelines to calculating bonus points:

547_Time slice3.png

Note : Here total IO mean the total time spent in the IO queue to this point and total CPU mean the total time spent in the CPU to this point.


Related Discussions:- Time slice

Code density and smaller faster programs, Q. Code Density and Smaller Faste...

Q. Code Density and Smaller Faster Programs? Memory was very expensive in older computer. So there was a need of less memory utilization, which is it was cost effective to have

What is FIFO, What is FIFO? FIFO is used as buffering element or queui...

What is FIFO? FIFO is used as buffering element or queuing element into the system that is by common sense, is needed only while you slow at reading than the write operation.

How many precision resistors requires a weighted resistor, A weighted resis...

A weighted resistor digital to analog converter using N bits requires a total of ? Ans. Digital to analog converter, a weighted resistor using N bits needs a total of N precisi

Determine about the pick device, Determine about the Pick Device Light ...

Determine about the Pick Device Light Pens The light pen used to select screen positions by detecting the light coming from points on the CRT screen. These are sensitive to

How to modify or delete a custom class name, 1. Click Tools > General Optio...

1. Click Tools > General Options, and then click the Object Mapping tab. 2. From the Object type list, select the standard object type that is associated with the object class

Minimis logic function using K-map, Minimise the logic function F (A, B, C,...

Minimise the logic function F (A, B, C, D) = Π M (1, 2, 3, 8, 9, 10, 11,14) ⋅ d (7, 15) Use Karnaugh map.   Ans. Given function F=∏M(1,2,3,8,9,10,11,14).d(7, 15) F'=B'D+B'C+AC+AB'

What is memory controller, What is memory controller? A memory controll...

What is memory controller? A memory controller is a circuit which is interposed among the processor and the dynamic memory. It is used for performing multiplexing of address bi

Name the popular security measures, Name the popular security measures ...

Name the popular security measures A number of security products covering a broad range of methods are available in the market. Most popular of all the security measures are th

How to insert script in dreamweaver, Q. How to insert script in dreamweaver...

Q. How to insert script in dreamweaver? Step 1: Click on Insert Step 2: Click on Script Step 3: Choose the type of Script Step 4: Write the code in "Content" Step 5: T

What is a union, What is a union ? A union, like a structure, is a derive...

What is a union ? A union, like a structure, is a derived type. Unions follow the same syntax as structures but have members that share storage. A union type defines a set of alt

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