Preemptive & Nonpreemptive Kernel VS Premptive & Nonpreemptive Scheduling
I'm struggling to understand the difference between between preemptive and nonpreemptive kernels, and premptive & nonpreemptive scheduling. From Operating System Concepts (Ninth Edition),...
View ArticleImplementation of Round Robin in Scala
i have implemented Round Robin Algorithm with fixed time quantum in Scala. Code is working fine with desired output but in a specific case code is not giving desirable results. Let I have five...
View ArticleShortest Remaining Time First Query
If they are two processes with the following Data, How should the Gantt Chart be?(SRTF scheduling) Process Arrival Burst P1 0 17 P2 1 16 So will the process P1 be completed first and then P2 will...
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Confusion regarding process scheduling (operating system )
I am confused by the following section of a book. Here we taking about FCFS Scheduling. I feel that calculation table is incorrect in the book. Because at time 7 P3 got completed, it's turnaround time...
View ArticleCalculation of response time in operating system
This was an exam question I could not solve, even after searching about response time. I thought that answer should be 220, 120 Effectiveness of RR scheduling depends on two factors: choice of q, the...
View ArticleMore threads imply more context switching? Is this true for the Linux Kernel?
There seems to be a widely spread idea that more threads imply more context switching but it just so happens that I'm not very sold to that idea -- at least it doesn't seem immediately obvious to me...
View ArticleAverage wait time for pre-emptive priority scheduling
Given the following table for calculating and average waiting time for the processes for priority based preemptive scheduling. Process Burst Time Priority P1 10 3 P2 1 1 P3 2 4 P4 1 5 P5 5 2 The gantt...
View ArticleTIME+ field in top command gives information accurate to the hundereth of a...
I am trying to calculate the time it takes for a thread to change status from S to R and TIME+ field of top is not granular enough for this. If there is another way to get this information, how can I...
View ArticleCPU Scheduling Algorithms (FCFS, SJF, and RR) Calculations
I'm working on a few problems (for homework, just as a preface) that deal with CPU scheduling algorithms, and want to confirm and get some advice/pointers on how to be faster when it comes to...
View ArticleWhat happens if a process is finished during the tims-slice in round robin...
There are three jobs, P1, P2, and P3, and I'm using round robin algorithm for scheduling these jobs. The time-slice(quantum) is 3, and the CPU burst time for each job is 7, 5, 10. So it would be...
View ArticleDoes OS save memory values in context switch?
I have a question about which datas will be saved in context switching. I have searched but all links just talked about registers.My question is does os also save the memory values of a process ?...
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How to solve this problem in Non-preemptive SJF algorithm
In this problem there has six process when i try to solve this problem the arrival time is beggest then the completion time
View ArticleXinu - Setting new priority for a Suspended state process
I have created a process X in Xinu along with other two processes (y, z). The y and z are high priority than X, so they both are running as per scheduling policy.In the backend, I want to increment the...
View ArticleGiven Burst Time and Time waiting in FCFS, calculate Arrival Time
I've got a pretty tricky problem on hand,Let's say that we are given 9 procceses with their respective Burst Times and Waiting Time for FCFS algorithm. Then, we are given 3 moments in time, M1=0 and M2...
View ArticleIn dekker's algorithm, can i remove the last instruction flag[ i ] = false?
Considering two processes, 0 and 1, and the program for the process 0: do { flag[0]= true; while(flag[1]==true) { if(turn!=0) { flag[0] = false; while(turn!=0); flag[0] = true; } } // CS turn = 1;...
View ArticleProcess Scheduling in CPU
Assume I have 2 CPU's C1 and C2. At the very base, every process executes on the CPU for a given time slice 't'. Using cgroups, assume I limit the process to ensure that it takes only 50% of cpu. Now,...
View ArticleCooperative Scheduling vs Preemptive Scheduling?
In the book Core Java : Volume 1 Fundamentals -> chapter MultiThreading . The Author wrote as follows :"All modern desktop and server operating systems use preemptive scheduling. However, smaller...
View ArticleAbout Operating system States
In a non-preemptive CPU scheduling scheme, can the scheduling take place when a process or thread switches from the waiting state to the ready state? Why
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 with...
View ArticleHow do Linux processes produce graphical output 60 times per second if the...
There's something I fundamentally don't understand about how multitasking works in Linux (and probably also in general). If I understand correctly, each time a process wants to change its output to the...
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