Questions tagged as ['cpu']

CPU stands for Central Processing Unit, and is the main processing chip used in every computer. Brands include Intel, AMD and ARM. CPUs are commonly available in 32- and 64-bit, and come in a variety of frequencies or with multiple cores.
Score: 0
Yuchen Wu avatar
read cpu frequency from cpufreq-info vs /proc/cpuinfo
us flag

Ubuntu 20.04 Comparing the following two ways of getting current cpu frequency:

  1. cpufreq-info | grep "current CPU frequency"

    example output:

     current CPU frequency is 4.16 GHz.
     current CPU frequency is 4.15 GHz.
     current CPU frequency is 4.20 GHz.
     current CPU frequency is 4.19 GHz.
     current CPU frequency is 4.22 GHz.
     current CPU frequency is 4.19 GHz.
     current CPU frequency is 4.17 GHz.
     current CPU  ...
Score: 0
thenemesis586 avatar
Ubuntu 20.04 Multicore CPU scaling/frequency issues on i7-10510U
de flag

Firstly, I will state my specs:

Intel i7-10510u with Intel UHD 620 graphics, AMD Radeon 610 dGPU, 256 GB Kioxia SSD,8GB RAM

I have a Dell Vostro 3590.

From my observations, individual cores do boost all the way to 4.9 GHz and when under a multicore task(like video encoding on handbrake), the frequency it stabilises at after a few minutes is 2.6-2.7 GHz after throttling on Windows. The problem I see in  ...

Score: 1
Ryzen 5900X CPU governors not available, and can't change
cn flag
$ systemctl status cpufrequtils.service 
● cpufrequtils.service - LSB: set CPUFreq kernel parameters
     Loaded: loaded (/etc/init.d/cpufrequtils; generated)
     Active: active (exited) since Wed 2022-01-26 16:58:27 EST; 11h ago
       Docs: man:systemd-sysv-generator(8)
      Tasks: 0 (limit: 76974)
     Memory: 0B
        CPU: 0
     CGroup: /system.slice/cpufrequtils.service

Jan 26 16:58:27 Y4M1-I ...
Score: 1
Roseblade avatar
not able to change cpu governer
sl flag

i'm currently using ubuntu 21.10 and i'm relatively new to linux so i'm not exactly sure how to change stuff but here's what i did seeking answers on diffrent forums

cpupower frequency-info
analyzing CPU 0:
  driver: acpi-cpufreq
  CPUs which run at the same hardware frequency: 0
  CPUs which need to have their frequency coordinated by software: 0
  maximum transition latency: 4.0 us
  hardware lim ...
Score: 2
lm-sensors: From sensors command, what is "Package id 0"?
in flag

When I run sensors on my xubuntu machine, I get the following:

Adapter: ISA adapter
Package id 0:  +80.0°C  (high = +100.0°C, crit = +100.0°C)
Core 0:        +80.0°C  (high = +100.0°C, crit = +100.0°C)
Core 1:        +46.0°C  (high = +100.0°C, crit = +100.0°C)
Core 2:        +53.0°C  (high = +100.0°C, crit = +100.0°C)
Core 3:        +48.0°C  (high = +100.0°C, crit = +100.0 ...
Score: 4
N0rbert avatar
Is it possible to install intel-mkl on Ubuntu 18.04 LTS?
zw flag

I know that this package is available via official repository only from Ubuntu 20.04 LTS and in newer versions.

Score: 0
eja avatar
Easy way of limiting my laptop CPU fans?
in flag

Is there an easy way to limit my max CPU fan speed, without affecting the fan itself on lower loads?

Preferably a tool with a GUI, or a CLI but without digging into multiple config files that could affect the whole system.

Score: 1
Limit the sum of 2 processes cpu usage?
br flag

2 processes, call it A and B
A has high priority,B has low priority
I want to limit total cpu usage of these 2 processes under 80%

Sometimes A has nothing to do,cpu usage is 0%, at this time, I hope B execute and take up 80% cpu
Sometimes A is working,cpu usage is 80%, at this time, I hope B do nothing and not use cpu(or use only a little, 1%)
Sometimes A take up 30% cpu, at this time, B should ...

Score: 0
Fantos avatar
CPU temperature high in Ubuntu, but not Windows
gb flag

Three days ago I started noticing my CPU fan loudly winding up and down when idling (with which I mean not running any particular program). I checked the CPU temperature which was and still is fluctuating between 50°C and 60°C. I also have Windows 10 installed as a dual boot where the CPU temperature readings still are about 40°C and the fans are quiet.

I am using Ubuntu 20.04 now for about tw ...

Score: 0
CPU frequency capped permanently until reboot
ve flag

I have an old spare Dell V131 that I use sometimes and after a while of being on, it caps CPU frequency to its lowest (800 Mhz) and stays there.

The variable

# cat /proc/cpuinfo | grep -i "cpu Mhz"
cpu MHz     : 1281.633
cpu MHz     : 1324.313
cpu MHz     : 1103.786
cpu MHz     : 1444.849

goes to solid

cpu MHz     : 798.181
cpu MHz     : 798.179
cpu MHz     : 798.182
cpu MHz     : 798.178

and then neve ...

Score: 0
Zealios avatar
Can't install any linux OS on my server - BUG: soft lockup - CPU#0 stuck
bj flag

I have been struggling for a while, and any help would really make my day :) Thanks.

Server Hardware: Dell R5500 Poweredge 2x: Intel Xeon 5000 128gb DDR3 RAM Unknown shitty GPU (i think Nvidia) 4x: 2TB WD HHDs

I recently wiped my disks on my server, since i wanted to switch to a new OS. I wanted to use Ubuntu Server, but when o tried installing the same error kept popping up;

BUG: soft lockup - CPU# ...

Score: 1
pyte avatar
lm-sensors not working on new Server
sa flag

I have a new Server here freshly installed with Ubuntu Server 20.04 LTS. After booting into the System the Fans get faster and faster until the spin at 100% it seems.

I've installed lm-sensors and ran sensors-detect, but it seems like it is not detected corretly. Here is the output of sensors:

Adapter: ISA adapter
Package id 0:  +50.0°C  (high = +90.0°C, crit = +100.0°C)
Core 0:    ...
Score: 0
Oto_Shan avatar
Raspberry Pi 4B cpu clock to 1800Mhz in Ubuntu server
cn flag

We see in Debian BullSeye cpu clock to 1800Mhz. Is it possible to do this in ubuntu server. Do we need overvoltage?

News link:

Score: 1
Bram avatar
Permanently setting intel pstate driver to "passive"
cn flag

My i5-11600K CPU is using the intel_pstate frequency scaling.

By default, the driver is in "active" mode and will throttle up ALL 6 physical cores, even if there is only work for one core.

To fix this, I do:

# echo "passive" >  /sys/devices/system/cpu/intel_pstate/status

But after a reboot, that setting is gone again.

How can I permanently set intel_pstate mode to passive?

Score: 0
Hüseyin Can Önel avatar
psensor stopped showing CPU temperature after AMD Ryzen upgrade
cn flag

Recently I've upgraded my AMD Ryzen 5 2600 CPU to AMD Ryzen 5 5600x. psensor used to show the CPU temperature properly with the 2600, but after the upgrade, all I see is "temp1 0 degrees" (image). Other temperatures (GPU, SSD etc.) shows properly. I've un/reinstalled psensor but it didn't work. Is there a fix to that?

PS: I've also updated my BIOS version during the CPU upgrade if it is related.

O ...

Score: 0
Which Ubuntu Version Will Work Best with 1.6MHz Dual Core Celeron N3050
in flag

It seems the 'formal'requirement for Ubuntu 20 is a 1.8GHz dual core Celeron. For lightweight work (web browsing, file transfers, downloads) would a 1.6GHz dual processor be OK?

Score: 0
Laptop fan runs at full speed for a few minutes on startup
us flag

My current laptop is an MSI but I've also encountered the same issue on a MacBook Pro & a Samsung laptop. All have dedicated GPU RAM.

Running Ubuntu 21.04, Intel i7, 32GB RAM, NVIDIA GeForce RTX 2060, 6GB RAM.

What happens? - When I boot up the laptop, the fan starts at full speed & continues for several minutes. I've checked the System Monitor & some of the individual cores in the CPU r ...

Score: 0
intel_pstate driver not being loaded when added to grub file
cz flag

I have a

Processor   Intel(R) Core(TM) i7-4700MQ CPU @ 2.40GHz
Memory  16305MB (2531MB used)
Machine Type    Laptop
Operating System    Ubuntu 20.04.3 LTS

In my /etc/default/grub file I have the line

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash intel_pstate=enable"

I did a sudo update-grub after the changes but when I do a cpupower frequency-info or a cpufreq-info --driver it says the driver used is

Score: 0
TD15 avatar
Intel tiger lake CPU not downclocking
cn flag

I have Kubuntu 21.10 installed on an HP laptop with a core i5 11th generation. The problem is that battery drains faster than it should. After investigating the issue it turned out to be the CPU not downclocking at idle causing power waste. I tried changing CPU scaling governor, setting maximum frequency manually but the CPU seems to be ignoring all of this and sticking to 1.6GHz+ frequencies no matter  ...

Score: 1
Scorb avatar
Can I install Ubuntu 20.04 on a system running Intel Alder Lake architecture
af flag

Intel Alder Lake has a new power + efficiency core architecture. As I understand it, the Linux Kernel does not currently support it.

Could I still run Ubuntu LTS on this hardware. What would the implications be? Would the OS treat all cores the same or would the efficiency cores sit idle?

Score: -1
rikkamp avatar
How to kill a process that autostarts
us flag

Recently I started managing a server (hostsed by a cloud provider) for my work. Problem is that the server is injected. Within now and a few months the server will be replaced by a new one in order to solve any threads.

THE QUESTION: In the ubuntu server there is a process I cannot totally backtrack the origin from which is coming back regularly. The process is using ca 80% of all available CPU w ...

Score: 2
Trevor K Smith avatar
HBA card seems disabled, link appears downgraded. Not sure why
ng flag

I have a HBA attached in a 8x pci slot, however, it is showing as x4 (downgraded). In addition, it seems to be disabled. I assume these things are not normal and the reason my setup is not working. Trying to troubleshoot the cause and get the HBA card working with my JBOD Enclosure. Currently, the SAS cables are coming up as fault, and im assuming the HBA is to blame.

Additional background

  • 256 cores
Score: 1
How to troubleshoot CPU HW crash in Ubuntu 18.04
cn flag

I bought a new computer a few months ago. I installed Ubuntu 18.04 and it's working fine except when I compile c++ code: it freezes hard as soon as there is a spike of high CPU usage (10+ cores).

The only working workaround is to compile with -j8. Going -j10 or above will make the system crash most of the time. -j16 crashes 100% of the time with big projects (and no ccache).

Details about my setup: ...

Score: 1
haleksandre avatar
CPU temperature spike in 90c+ only when plugged in
mz flag

My Asus Vivobook K571GT dual booting in Ubuntu 20.04 is recently started shutting down due to high temperature (reaching 99c+). These temperature are reached only when the laptop is plugged in.

The BIOS is updated to the latest, Ubuntu updated to the latest kernel. I've seen it might be due to nvidia driver not installed properly, so I tried a bunch of different nvidia drivers (460, 470 & 495 ...

Score: 2
ArashiInteractive avatar
Recommended way to limit CPU usage of a shell script
cn flag

On Ubuntu 20.04 I'm using the AWS CLI to send backup data from my web server to S3. While the script works, it consumes CPU usage to the point where other services begin to fail. This becomes a big problem when a website isn't accessible for up to 1hr while the script sends data.

Is there a recommended way to limit CPU usage of a shell script? The largest backup file is just under 70gigs, so wh ...

Score: 1
Shantanu Bedajna avatar
Psensor customize label add space
in flag

I am using Psensor and using the the label feature of sensors which allows Ubuntu top bar to show the temps and usage, but currently their spacing is too close and looking at it sometimes confuses me.

enter image description here

Like the first one is cpu temp, 2nd is cpu usage 3rd is gpu temp and 4th is gpu usage

Searched some threads but can't find how to do it, some people even added label names not sure if that is even po ...

Score: 2
Mohammad javad avatar
100% CPU usage when nothing is open
it flag

I have a problem with my laptop, when I turn it on, it's cpu percentage will go up and the fan start to work very fast.

I tried top command and find that there is a process with more than 70% cpu usage named whoopsie-upload. I tried to kill it but it's PID change each time that top command refresh.

please help me.

update 1 :

I did nothing before but today tried top command to check if a process made ...

Score: 2
NovHak avatar
CPU package badly configured on my MSI laptop, how to reconfigure?
cn flag

Problem :

A few months ago, I got a new MSI gaming laptop (GP76 Leopard w/Intel Core i7-10870H and Nvidia RTX 3070).

However, since the very beginning, I've been experiencing a very annoying behaviour : the CPU goes crazy too often, hence the fans, and for no good reason.

Workaround :

I worked around this problem by simply disabling Intel Turbo Boost : echo 1 >/sys/devices/system/cpu/intel ...

Score: 0
Fabio Manniti avatar
How can I understand the reason my computer freezes?
ca flag

I would like to ask a question: Due to my job I often use many programs together and sometimes my computer freezes, sometimes I can really feel its pain. This often happens when I both use Skype (video calls) and IntelliJ or Virtual Machine is on.

How can I understand if this is due by CPU or RAM (or maybe something else)?

Thank you for your help.

EDIT. As suggested by @heynnema, here is the result for ...

Score: 4
KneadToKnow avatar
Upgrade to 21.10 brings 15-20° CPU temp increase
us flag

Last Saturday night, I upgraded from Ubuntu 20.04 to 21.10. In reviewing my logs, I've noticed that immediately upon my upgrade, and lasting since, my PC's CPU temp baseline has jumped 15-20°. See charts from Friday, Saturday, and Sunday below, for comparison. I'd love to know if anyone has any thoughts on what might be going on.

Friday Saturday Sunday

Device specs: AMD Ryzen 5 3600, 64 GB RAM. I'm happy to provide any  ...