Questions tagged [scheduler]
The scheduler tag has no usage guidance.
29
questions
1
vote
0
answers
37
views
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 ...
- 11
0
votes
1
answer
373
views
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 ...
- 1
0
votes
0
answers
30
views
Change the scheduler
I have made my kernel-module which is a scheduler and i want to use it. My scheduler is team29682972_kyber. I run the command insmod. Then cat /sys/block/sda/queue/scheduler. I have :
[mq-deadline] ...
2
votes
2
answers
612
views
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 ...
- 5,676
0
votes
1
answer
452
views
Edit crontab file in /etc as root user and add a line, Newbie challenged with syntax [duplicate]
I set up my CRM on-premise. Within CRM set up sync to Google Calendar. A manual test run within the CRM demonstrates that sync is working.
The CRM implementation guidelines state the following: For ...
- 1
1
vote
0
answers
147
views
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.
- 11
0
votes
1
answer
1k
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" ...
- 281
1
vote
1
answer
802
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. ...
0
votes
1
answer
505
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 ...
- 519
1
vote
0
answers
72
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
5
votes
2
answers
1k
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 ...
- 230
2
votes
1
answer
13k
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 ...
- 25
1
vote
0
answers
148
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 ...
- 11
0
votes
1
answer
85
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?
1
vote
2
answers
2k
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/...
- 2,493
2
votes
3
answers
2k
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 ...
- 23
10
votes
1
answer
16k
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 ...
- 278
0
votes
1
answer
751
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 ...
- 66
0
votes
1
answer
601
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 ...
- 3,125
1
vote
1
answer
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
- 11
1
vote
0
answers
53
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 ...
- 11
8
votes
1
answer
2k
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?
- 237
4
votes
1
answer
4k
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 ...
- 1,980
2
votes
3
answers
9k
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 ...
- 33
5
votes
1
answer
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.
...
0
votes
2
answers
2k
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 ...
1
vote
1
answer
275
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.
- 11
18
votes
3
answers
19k
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 ...
- 183
0
votes
1
answer
1k
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 ...
- 2,813