Questions tagged [scheduler]

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How to use taskset with more than 128 cores?

I am using taskset with more than 128 cores. I know that a cpu with less than 32 cores can run the following: taskset -p 0xFFFFFFFF pid How do I present the other cores besides the 32 cores. Thanks.
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Customized CPU scheduler?

I am trying to write a customized CPU scheduler in Linux. I want to schedule the CPU based on the cpuinfo. How should I get started? Is there any reference or tutorial?
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BFQ scheduler not sharing the io bandwidth according to weight in CgroupV2

I am using BFQ io scheduler for leveraging the weight based io bandwidth distribution in Cgroup V2. Below are few detail of my environment. OS -> SLES 15-SP2 Kernel -> 5.3.18-24....
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1answer
115 views

How to enable blkmq for NVMe devices?

Ubuntu: 20.10-desktop kernel: 5.8.0-40-generic Device: Samsung 980 pro 500G $ cat /sys/block/nvme1n1/queue/scheduler [none] mq-deadline Does it means I am using the "Linux I/O scheduler" ...
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1answer
352 views

installing job submission management (eg slurm) on ubuntu 20.04

My lab is currently working with an ubuntu based distribution in 20.04 on a machine with 72 cores. We'd like to setup a job scheduler so we could submit computing jobs to each of the different cores. ...
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1answer
136 views

Setting UDEV rule for scheduler setting on USB drives fails

I am trying to set different rules in UDEV to change the scheduler based on the type of USB media that is inserted. For regular flash drives the scheduler should be NOOP, but for my USB HDD with ...
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0answers
32 views

Is there a simple way to visualize the process scheduler in a way similar to htop?

I'm hoping for a visualizer where I can see at a detailed level what processes on my computer ran when. Is there anyway to easily accomplish this? Thanks
4
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1answer
149 views

How to get I/O priority to work on Ubuntu?

Ubuntu has ionice, but as far as I can tell, it does absolutely nothing. I suspect this is because Ubuntu replaced cfq with deadline and deadline doesn't support priorities. Is there any possible ...
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1answer
2k views

task scheduler in ubuntu

I have a python script and would like to run it every day at 3:00 AM but I can't schedule tasks on linux the same on windows. I tried to execute the following command in terminal sudo apt-get ...
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79 views

priority trouble with nice / renice

It seems to me that the whole nice/priority scheme doesn't actually do anything. PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 10084 dick 39 19 1221848 225120 ...
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1answer
41 views

I need to stop a execution of a command and start the same comma every x interval of time in terminal?

I need to stop execution of a running java script in terminal and start the same execution at every x interval of time in terminal. Is it possible?
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2answers
1k views

Missing disk io schedulers

The question is , where are the schedulers ? # for f in /sys/block/sd?/queue/scheduler; do printf "$f is "; cat $f; done /sys/block/sda/queue/scheduler is [mq-deadline] none /sys/block/sdb/queue/...
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3answers
1k views

can't set CFQ elevator on Kubuntu 19.04

You can not choose CFQ scheduler in Kubuntu 19.04 since it has been removed from the 5.0 kernel. In my case I need CFQ because it gives the best performance with my rotating hard drive when running a ...
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1answer
6k views

rcu_sched self-detected stall on CPU + watchdog: BUG: soft lockup - CPU#3 stuck for 22s

Being unable to ssh into a machine I connected it to a monitor and found the following: The machine is running Ubuntu Server 18.04 LTS and is a first generation 8 core Ryzen 1700. I've restarted the ...
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1answer
511 views

Ubuntu 18.04LTS and Kyber Scheduler

I am trying to enable kyber IO scheduler on Ubuntu Server 18.04LTS. This is the method I used to use on Ubuntu Server 16.04LTS. nano /etc/default/grub GRUB_CMDLINE_LINUX_DEFAULT="console=tty1 ...
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1answer
401 views

Is it possible to make Ubuntu always responsive? [closed]

I have been with Ubuntu for over 10 years and I have installed and used it on machines ranging from low-end laptops through mining rigs to i7, 8Gb RAM desktop computers. And on every single ...
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1answer
4k views

18.04 Task scheduler

I am trying to find the equivalent of the gnome task scheduler in Ubuntu 18.04 DESKTOP without success. Can anyone point me in the right direction? Thx, Mike
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mysql service always running, not schedule by Kernel scheduler?

I would like to ask a question: I have attached screenshot of TOP command of my server. Mysql is always on top and running. While other processes runs/sleeps by ubuntu Scheduler. Even the process ...
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1answer
1k views

Cron/Anacron vs. Systemd

Linux provides three different job schedulers i.e. Cron, Anacron and Systemd-Timer. What are the benefits of Cron/Anacron vs. Systemd-Timer?
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1answer
3k views

Where are I/O schedulers set permanently? Kubuntu 20.04.1 64 bit

I want to use two schedulers since I have a two Disks set for my system due to a separate HOME disk. Meaning I have SDA and SDB Doing echo noop /sys/block/sda/queue/scheduler says permission denied ...
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3answers
6k views

Why does my CPU only primarily use one core?

It loads 100% from one of the CPUs at a time. Is that on purpose? Shouldn't it try to do 25/25/25/25? It's an Intel i5-3320M - 2,60GHz x 4 My friend on a win10 is load-balancing 'correct' loading ...
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1answer
8k views

On Ubuntu 16.04, with Samsung 850 EVO SSD, is any post configuration needed?

The Samsung Evo 850 http://www.samsung.com/semiconductor/minisite/ssd/product/consumer/850evo.html The following post suggests that with Ubuntu 16.04 and the 850 EVO, TRIM is enabled by default. ...
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2answers
1k views

CPU load not evenly distrubuted over cores

I am pretty new to Ubuntu, and want to change from my Windows enviroment, to a Linux Distro. Since most (consumer) Linux software is designed for Ubuntu, I chose this distribution. Everything works ...
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1answer
226 views

how to run linshed simulator?

I'm trying to developed multi-core scheduling algorithm. For that, I need a linshed simulator. I cloned it to my PC. But there aren't many details about how to run the simulator.
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18k views

Why does Ubuntu 16.04 set all drive IO schedulers to “deadline”?

I just installed Xubuntu 16.04-64bit to a second partition on my laptop. I noticed it seemed a bit slow at times, so I checked which IO scheduler it was using for that drive, which turns out to be ...
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1answer
961 views

scheduler: how to tune cfq to favor interactive processes

Problem: scheduler doesn't seem to favor interactive processes: On a desktop system with automatic cron-scheduled backups from one (btrfs) disk to another (ext4). The backup process mounts the idle ...