Questions tagged [scheduler]

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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
23 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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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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2answers
152 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
2k 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
326 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
221 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
2k 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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0answers
30 views

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
865 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
2k views

Where are I/O schedulers set permanently?

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 I can do echo noop /sys/block/sda/queue/scheduler, but it doesn't stick ...
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3answers
3k 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
7k 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
814 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
177 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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3answers
16k 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
764 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 ...