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Questions tagged [preemption]

131 questions
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Increasing time slices for a particular process via implementing a system call in xv6

I am trying to implement a system call in xv6 OS Increase_time( int n) which when executed will increase the timeslice of a program that calls it by n times. The default xv6 scheduler uses a simple FCFS and RR policies with each process having the…
Nishka Sharma
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Preemptive Cloud Run on GKE

Is it possible to create a Cloud Run on GKE (Anthos) Kubernetes Cluster with Preemptible nodes and if so can you also enable plugins such as gke-node-pool-shifter and gke-pvm-killer or will it interfere with cloud run actions such as autoscaling…
john_taylor
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Why does spin_unlock_bh function enables preemption without calling the scheduler

I was looking into the spinlock code of kernel code (version 3.10.1), and didnt understand one thing. When acquiring the spinlock through the function spin_lock_bh(), it goes ahead and calls preempt_disable(). This is the same as other spinlock…
Haris
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Is AWS pre-emptive (for HTTP result callbacks)?

I know zero of AWS and am asking for a friend who is a novice Node.Js coder and getting a little out of his depth. He sends an HTTP request then calls a function which will take some time to execute. If the HTTP response arrives while the long…
Mawg says reinstate Monica
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is AnyLogic End of Task Preemption possible in version 8?

I'm running a simulation model on AnyLogic. I recently updated to version 8 University 8.4.0. Before I that I had no problems running the simulation. Now I get the following error after running the simulation for a short…
zarmin
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how can I increase failure tolerance for spark jobs on yarn? Job failed due to too many preemntions?

How can I increase failure tolerance on yarn? In a busy cluster my job fails due to too many failures. Most of the failures were due to Executor lost base by preemption.
Georg Heiler
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Ensure that code within CompletableFuture callback executes after

Say I have this: public void foo(){ CompletableFuture.delayedExecutor(1, TimeUnit.MILLISECONDS).execute(() -> { doSomethingA(); }); doSomethingB(); } Is there any guarantee…
Alexander Mills
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What happens when a task is executing critical section but it needs to be scheduled out on a uniprocessor system with preemption disabled?

Here is a scenario. Let’s say that a kernel task is running on a uniprocessor system with preemption disabled. The task acquires a spin lock. Now it is executing it’s critical section. At this time, what if the time slice available for this task…
user3778271
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When does the operating system gain control over the CPU when a user process is executing

I am currently studying about operating systems and have something that I do not completely understand. In a time shared system with preemption, processes are always swapped. However, if a user process is executing on one of the CPUs there can be no…
ficabj5
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What is the relation between reentrant kernel and preemptive kernel?

What is the relation between reentrant kernel and preemptive kernel? If a kernel is preemptive, must it be reentrant? (I guess yes) If a kernel is reentrant, must it be preemptive? (I am not sure) I have read https://stackoverflow.com/a/1163946, but…
Tim
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Lottery Scheduling - preemptive - How to manipulate the tickets after a process is choosen?

Assume there are 2 processes with tickets A:75 and B:25. Now if lottery results in ticket number = 66, that means we run A. This is okay for non-preemptive kernels because A will run until A is complete and then will not participate in the…
Aviral Verma
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Kubernetes 1.11 priority and preemption do not work

I followed the following instruction on Kubernetes 1.11 but priority and preemption do not work. https://kubernetes.io/docs/concepts/configuration/pod-priority-preemption/#how-to-use-priority-and-preemption I create 2 pods one high-priority (with…
Tan Le
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Can Kubenetes pod preemption happens between multi schedulers?

From document I know that a Pod must be scheduled by one scheduler. Such as scheduler A schedule pod a and scheduler B schedule pod b. The question is that: can a preempt b if b is already running? Which scheduler will do this operation?
Gong WeiBao
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Create a priority based round robin algorithm

In this question I want to develop a Priority Based Round Robin algorithm for schedule some tasks. This is the input tasks AT = Arrival Time BT = Burst Time P = Priority Process AT BT P 1 0 8 5 2 1 4 1 3 2 9 4 4 …
kasvith
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How does linux detect a process which is hogging the CPU and should be removed rather than preempting?

In a work queue, if a function is hogging the system(eg. running an infinite loop), how will the kernel know that it is hogging and it has to either preempt or cancel the work?
Shashwat KN
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