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Questions tagged [scheduler]

28 questions
18
votes
3 answers

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 deadline for all drives. I do have a couple of…
curt54
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10
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1 answer

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 machine since and it works fine but am not sure…
Greg
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8
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1 answer

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?
N Randhawa
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5
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1 answer

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. However, cat…
Jonathan Gallagher
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5
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2 answers

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 way to have prioritized I/O on Ubuntu anymore? EDIT:…
Paul Draper
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4
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1 answer

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 with SUDO I tried the suggested solution but it…
userDepth
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3 answers

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 the same file. (it's an insanely huge .osm that we're…
Seyb
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2
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2 answers

System becomes completely unresponsive minutes after starting 7z - how to work around or fix this?

I've never encountered this before, but most of the time I was careful to stick a nice ionice -c3 in front of the command to be executed. But this time the use of nice and ionice merely delayed the effect. Either way, I am using Ubuntu 20.04 as my…
0xC0000022L
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2
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1 answer

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 install gnome-schedule he returns me error E: Unable to…
CodeBasic
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3 answers

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 virtual machine with Windows 10 as guest S.O, the…
Horacyo
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1 answer

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.
user_5939667
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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.
Lee
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1
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1 answer

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. I've gone through the slurm quickstart but have…
Ryan Schubert
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0 answers

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
William Derksen
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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 6128 S 407.6 1.4 23478:00 povrayws 5311 dick …
Dick Balaska
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