Calculation 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 ArticleDoes it make sense to run more PHP-FPM children than number of CPU cores?
Assuming that I have a CPU with 4 cores and 4 threads, does it make sense to run e.g. 8 PHP-FPM workers by setting pm.max_children = 8 option? As far as I'm concerned, CPU with 4 threads can only run...
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View ArticleHow does a process schedule its own threads
After the Kernel schedules a process that has threads, How does said process schedule its own threads during its time splice?
View ArticleWhere do blocking I/O comes from?
My understanding is that the hardware architecture and the operating systems are designed not to block the cpu. When any kind of blocking operation needs to happen, the operating system registers an...
View ArticleDoes First Come First Serve (FCFS) suffer from Starvation?
Does First Come First Serve (FCFS)suffer from Starvation?An esteemed computer science examination in India included this question.The complete question goes as follows-Which one or more of the...
View Articleoperating system - where is long term scheduler used?
I understand that long term scheduling decides the degree of multi-programming, but I am unable to understand where it can be used. Because let say I want to run some process and double click that...
View ArticleWhat is the difference between interrupt latency and interrupt response?
Everywhere I searched on Google has not provided me the answer I was looking for. In fact, most of them say they are used interchangeably. My assignment has posed this question and I would really like...
View ArticleCan we steal more CPU time/Resource by having more(than other running apps on...
We know, the CPU Schedules thread. So if my app has much more thread than other apps, then will my app get more CPU time? I think OS can somehow prevent this since it knows which process these threads...
View ArticleNiceness and priority processes on Linux system
I am looking for a way to modify a process' priority through command line.I found the builtin (bash) nice and the command renice which allow to modify the niceness of the process, but not the actual...
View ArticleWhy one non-voluntary context switch per second?
The OS is RHEL 6 (2.6.32). I have isolated a core and am running a compute intensive thread on it. /proc/{thread-id}/status shows one non-voluntary context switch every second.The thread in question is...
View ArticleThe relationship between interrupts and process scheduling
I am a beginner in operating systems and I have just learned about process switching. I have just finished reading about the concept of "interrupts". The book explains that interrupts are divided into...
View Articlewhats the come back in this CPU scheduling algorithms task? [closed]
Consider the following set of processes:Once each process is done processing its “Burst Time”, it goes to the waiting queue, then “Comes back” to the ready queue after the time shown.You are required...
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 ArticleScheduling priority considerations
Schedulers in contemporary operating systems implicitly give higher priority to I/O bound process over CPU bound processes. Do you think that while scheduling the processes, CPU bound processes should...
View ArticleTesting CPU Scheduling
How can I test a CPU scheduling algorithm (example:RR)?As you know, an operating system includes its own processes which run on the CPU. However, I want to do it in a pure environment without any other...
View Articlecpu scheduling response time?
Hi I got the following questions for homework but I am unsure about my conclusion any help would be appreciated 1) For what types of workloads does SJF have the turnaround times as FIFO?I think the...
View ArticleRound Robin Implementation with Different Arrival Time
I have created a Round Robin Algorithm with C. The output I get for 5 processes with the same arrival time is correct but incorrect for different arrival times. Below is an example,RRB.C#include...
View ArticleIs the response time and waiting time always the same in FCFS?
From my understanding since FCFS is non-preemptive, the time until it is selected by the scheduler for the first time is the same as the total time spent in the ready queue, thus the response time is...
View ArticleMLFQ anf RR in XV6
I am trying to understand how the MLFQ and RR in XV6 work. An implementation i have seen is as follows:void rr_scheduler(void) { struct proc *p; struct cpu *c = mycpu(); c->proc = 0; intr_on(); for...
View ArticleIf burst time becomes 0 highestpriority must change how to do it?
Enter process 1 details (pid, arrival, burst, priority, color R, G, B):): 1 0 8 31 0 0Enter process 2 details (pid, arrival, burst, priority, color R, G, B):): 2 1 2 4 1 1 0Enter process 3 details...
View ArticleHow does de OS know which solution to apply to a concurrency problem?
When x1, ..., xN proceses try to access some A resource, how does the OS know the particular solution to use for handling the issue of concurrency?If A is serially reusable then the solution can be a...
View ArticleHow to best organise concurrent processing of a set of processes with known...
We have a task handling system that handles a number of tasks, between 12 and 16 at any given batch, using 4 CPU's. Each task takes a known amount of time on a single CPU.At the moment, the order of...
View ArticlePreemptive & Nonpreemptive Kernel VS Premptive & Nonpreemptive Scheduling
I'm struggling to understand the difference between preemptive and nonpreemptive kernels, and premptive & nonpreemptive scheduling.From Operating System Concepts (Ninth Edition), Silberschatz,...
View ArticleDoes Preemptive Scheduling Inherently Require Time Slices?
I'm studying operating systems and have encountered conflicting information about preemptive scheduling, specifically regarding SRT (Shortest Remaining Time) scheduling. My question focuses on whether...
View ArticleIs a schedulable unit of CPU time slice process or thread?
I want to clarify whether "a schedulable unit of CPU time slice" is "process" or "thread" (kernel managed thread). What I mean by "schedulable unit of CPU time slice" is the unit which CPU scheduler of...
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