Short term, Long term and medium term schedulers
What are the scheduling algorithms(FCFS,SJF,SRTF,LRTF,RR e.t.c) used by short term, medium term and long term schedulers respectively ?
View ArticleIs using a hardware timer the only way to implement process scheduling?
I have read that an operating system implements scheduling using the following method: The CPU must have a hardware timer that fires an interrupt every X milliseconds. Once the timer interrupt fires,...
View ArticleHow is fairness of thread scheduling ensured across processes?
Every process has at least one thread of execution and I read somewhere that modern Operating Systems only schedule Thread and not process. So if there are two processes running in the system - P1...
View Articlescheduling realtime systems vs on-line systems vs batch systems
Im trying to understand how their scheduling criteria works. why IO bound and CPU bound mix are more important to batch processes?. does Preemptive scheduling important to all? thanks alot for the help.
View ArticleWhy is my programme showing Segmentation Fault on Ubuntu but working fine on...
Experts, this is the program I made for First Come First Serve Scheduling in C language. For the inputs like - 4 0 0 0 0 1 2 3 4 and inputs like - 5 0 1 2 3 4 4 3 1 2 5 My program is giving...
View ArticleAutomatically Execute R Script When (text) File is Updated
I want to automatically run/ execute my R script when a Text file is updated. So far, I only can schedule an execution of my R script for a specific time (per hour, daily or month) see (Scheduling R...
View ArticleSJF Scheduling: Selecting Process based on predicted CPU Burst Time
In SJF Algorithm, we predict the next CPU Burst time using the formula: τ(n+1) = α*t(n) + (1-α)*τ(n). And then we select the process with the shortest predicted burst time. Now my question is: do we...
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Shortest Time Remaining Next (STRN) Scheduling
Another user posted this question on Shortest Job First (SJF). Here's the example: How would this be solved for Shortest Remaining Time Next? The preemptive version of Shortest Job First. I understand...
View ArticleUnable to set scheduling policy using sched_setscheduler() function?
I am new to OS programming. So, I wrote this code to change the scheduling policy of a background process, whose process ID I supply through a command line argument, but the sched_setscheduler()...
View ArticleHow to determine scheduling evaluator metrics
So I've read up that the important basic metrics are that of Waiting Time, Turnaround Time and Response Time. Though my program provides me with the following variables: createdTime //process created...
View ArticleSorting CSV by column
So I am trying to sort the column for arrival time so that the earliest arrival time is first. Im new to csv files in java so struggling big time. I've managed to read the csv file and print using an...
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Shortest Job First (non preemptive) with future prediction scheduling example
I understand how shortest job first (non preemptive) scheduling works. Basically, when the CPU finish the current job it will select the shortest job in the queue to execute next. This is an example I...
View Articlewhat happens at processor and schedule queue level when I call time.sleep()...
Hey I am just trying connect my learning in Operating System subject and python programing. When I run time.sleep(10) what exactly happens behind the scene. My confusion here is if CPU needs to keep...
View ArticleShortest Job First for Multiple Queues
Currently, I have a program which simulates a shortest job first strategy for a set of processes. However, my task is to make it for multi-priority level queues. So a queue for HIGH, MILD, LOW: HIGH =...
View ArticleWhat scheduling algorithms does Linux kernel use?
What scheduling algorithms does Linux kernel use? Where can I get more info about linux's kernel? (OS first course... student level)
View ArticleMLFQ only functions when other class runs
I have a multi-level feedback class which I am not sure what its doing - it only ever seems to print the output I want when I run a pre-emptive multi-level class before it, when I don't it prints a...
View ArticleWith modern OS schedulers, does it still make sense to manually lock...
I recently learned that sometimes people will lock specific processes or threads to specific processors or cores, and it's thought that this manual tuning will best distribute the load. This is a bit...
View ArticleHow does the OS scheduler regain control of CPU?
I recently started to learn how the CPU and the operating system works, and I am bit confused about the operation of a single-CPU machine with an operating system that provides multitasking. As such,...
View ArticleHow to distinguish between I/O bound and CPU bound jobs ?
How does a long term scheduler decide which job is I/O bound and which one is CPU bound? I heard that by using cpu burst we can distinguish between I/O bound and CPU bound jobs, but how is the CPU...
View ArticleMultilevel feedback queue scheduling Algorithm
How would the multilevel feedback queue scheduler perform on multi core processors? Is it Multi core scheduling Algorithm?
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