Questions tagged [scheduler]
29 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
- 183
11
votes
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
- 298
9
votes
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
- 257
5
votes
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
- 2,040
5
votes
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…
5
votes
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
- 240
4
votes
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
- 55
3
votes
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
- 5,870
2
votes
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
- 33
2
votes
0 answers
OS Schedules almost all work on a single CPU core after upgrading from Ubuntu 20.05 LTS to Ubuntu 22.05 LTS
As stated in the title, my OS automatically schedules almost all work on a single CPU core after upgrading from Ubuntu 20.05 LTS to Ubuntu 22.05 LTS.
I've provided a few screen shots from htop to explain the problem.
In the following example I've…
samzapo
- 21
2
votes
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…
2
votes
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
- 23
1
vote
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
- 11
1
vote
1 answer
Can't find `min_granularity_ns`(sched) on Ubuntu 24.04
In previous LTS of Ubuntu with the newer version of Linux kernel /proc/sys/kernel/sched_min_granularity_ns has been moved to /sys/kernel/debug/sched/min_granularity_ns. In Ubuntu 24.04, this parameter/file vanished from…
Arseniy
- 11
1
vote
1 answer
Ubuntu 22.10 with intel 13900K system is unresponsive at full load
We got a workstation pc with i9 13900k and ubuntu 22.10 is installed.
When all cores at their max, system becomes unresponsive. Rejects all ssh connections and keyboard and mouse does not work.
Tried to troubleshoot it but wasnt able to as we cannot…
batu
- 11