Questions tagged [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.

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Ubuntu 20 server htop shows 100% CPU usage, why?

The title says it all, and I also asked the same question here: https://stackoverflow.com/questions/67464225/digitalocean-server-cpu-100-without-app-running Not sure which is the right place to ask ...
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How to enable offline cpu in qemu?

I am using qemu to run ubuntu16. I met offline cpu. I want to enable it. However, /sys/devices/system/cpu/cpu0 is not found. How to enable it? Thanks very much. ~$lscpu Architecture: x86_64 ...
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CPU starts running at 100% when charging

My CPUs start alternating at 100% at seemingly random intervals, even though no process is using excessive amounts of CPU. I have noticed that this behaviour seems to occur when I am charging my ...
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Black screens but detected after changing screens

I have a PC running Ubuntu 20.04 equipped with an I7 10510U processor without additional graphics card which worked fine with older screens. But since I tried to use my new 2 screens (Samsung Odyssey ...
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Unable to see CPU temps on Ubuntu 21.04

I'm a new Linux user and recently upgraded Ubuntu from 20.10 to 21.04. My main problem is that the "sensors" utility doesn't show my CPU temps even after doing sensors-detect. My CPU is ...
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Ubuntu how to change CPU max MHz?

Screenshot of terminal Hi i have set my cpu frequency to 3900 MHz in my bios however on the lscpu in the terminal it is showing different values? is there a way to change this I have no idea as im new ...
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Ubuntu is slower than tortoise

I installed ubuntu 20.04 (64bit) not more than 1.5 month ago. Now it has became slower as tortoise. It hangs a lot. Apps are also crashing After running top in my terminal in case you need it y@...
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Uneven load in CPU cores

I am using intel-5200u processor. When I turn on virtualization my 2 cores always stays at 100% and when I turn it off one core always remains 100%. Why load is not distributed to other cores? And how ...
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Customized CPU scheduler?

I am trying to write a customized CPU scheduler in Linux. I want to schedule the CPU based on the cpuinfo. How should I get started? Is there any reference or tutorial?
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Docker Build Crashes Ubuntu

i am using a MacBook Pro 2018 with Ubuntu 20.04 as dual boot and currently try to build a docker container but every time i build it, my laptop freezes and then shuts down with the fans spinning at ...
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libsensors nct 5585d what driver

I have a new motherboard AsRock H470M-HVS with nct5585d that libsensors 3.6 detect as nct6755 but modprobe refuses to load nct6775 module because the hardware is not found. I googled but with no ...
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Sudden drop of CPU performance on ubuntu 20.04

I own a Poweredge R620 server with 2x Intel Xeon CPU E5-2695 v2 @ 2.40GHz This server was perfectly working for years without issue. It was reinstalled with a fresh ubuntu 20.04 10 months ago and was ...
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Wifi gets disconnected and kworker/u8+ having 100% cpu consumption

I am using Ubuntu 18.04 LTS. My internet is getting disconnected after 10 minutes of starting. A few seconds later I can see kworker/u8+ shows 100% CPU usage by using the top command. I am not able to ...
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Ryzen voltage on Ubuntu

I started machine on Ubuntu with Ryzen 7 3800x and want to check CPU temp and voltage. I already installed the newest kernel: Linux 5.12.0-051200rc6-generic I've added: acpi_enforce_resources=lax ...
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vs code jedi language server is running over 120.9% of CPU on ubuntu

I don't know why all of a sudden python3 decided to run over 120.9% of CPU but I'm facing this problem since last week and I still couldn't find out the solution. I don't know why I can't find any ...
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Loading Ubuntu on to old netbook running Windows XP [duplicate]

I am new to Ubuntu. I have an old Samsung netbook with a 1.6GHtz processor and only 0.99GB RAM. Can I run last desktop version on this machine?
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What makes my CPU frequency drop on intensive application?

I am currently developing a software related to robotics, using Ros and the OpenVino toolkit on Ubuntu 18.04 LTS. I am doing some intensive computation related to computer vision, so I am looking for ...
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Find the total CPU usage on Ubuntu server version 20.10 without installing additional tools

I need to find the total CPU(s) usage of the server without installing additional tools. Do I understand correctly that the field id of the top command in CPU(s) line can help me with it? Can I do 100 ...
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Intel Core i7-8550U cpu frequency drops on high loads on Ubuntu 20.04

I installed Ubuntu 20.04 and have the following cpu: grep -E '^model name|^cpu MHz' /proc/cpuinfo model name : Intel(R) Core(TM) i7-8550U CPU @ 1.80GHz cpu MHz : 3000.025 model name : Intel(R) ...
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Same specs, but Ubuntu is more sluggish than Windows. Why?

I have a laptop using Intel Core i3-7130U CPU and Intel UHD Graphics 620 GPU. Also using an SSD. On Windows 10, it flies. Animations are smooth, and programs launch instantly. On Ubuntu 20.04 and 20....
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Computer CPU Frequency not scaling high enough when needed - Ubuntu 20.04

this is an issue I've been dealing with since I started using this laptop 2 weeks ago. The Issue My CPU frequency isn't scaling high enough to deal with load. I'll regularly be on video calls, be ...
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CPU Fan Speed 0

So, I am using Asus ROG-GL553VE. It has 8GB RAM and runs on Ubuntu 20.04 and Windows Dual boot. My issue is, that the fans are making way too much noise even when I am not putting any load on the ...
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Monitor CPU cumulative usage by process over time

I'd like to collect CPU usage info over some time to answer the question which process stresses my system overall the most. Is it Firefox? Is it ffmpeg? Etc. I have htop installed, but there one ...
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Can't find my CPU temperature anywhere

I built a pc with the new(almost) Ryzen 7 5800x, and I tried multiple thing such as tooling like sensors or glances, to even look into /sys/class/hwmon/ to find something but I really can't find them. ...
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How can I setup & use write-back memory type range from userspace?

Using the sample code from 12.6. Creating MTRRs from a C programme using ioctl()’s I can create a write-back type memory range. However, I was wondering if anyone can tell me how can I use that? I ...
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How to underclock a CPU

I am trying to find a solution to my laptop constantly overheating. One thing I saw is that when idle my CPU does almost nothing (utilization is around 1%), but the temperature is as high as 70*C. My ...
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Can I run Ubuntu 20.10 smoothly on Intel Pentium G3220? [duplicate]

I use a desktop with a 4GB Ram and Intel Pentium Gold Processor. Can I run Ubuntu 20.10 smoothly on the desktop?
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OS becomes unresponsible, when doing heavy processing

I use my machine (HP EliteBook 850 G5) for programming. Unfortunately I have the problem, that when I screw up somehow (e.g. creating an infinite loop, making an expensive db-query, and so on), my ...
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POP desktop : What is this 'gjs' process which taking up so much memory and cpu?

I have installed pop-desktop on my Ubuntu 20.04 and found that the environment is way faster, smoother than my past GNOME Shell. What is odd is that, there is a process named gjs and its taking up ...
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Showing total CPU usage by using htop

Online I found the following figure where you can see "CPU" as first row and it should represent the total amount of the used CPU. Amongst the options of the htop I run on my PC there isn't ...
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Why does Ubuntu run my processor well below its base clock speed and how can I get it to match the processor's true speeds?

I recently built a new desktop with an AMD 5600X processor, and am running Ubuntu 20.04, Windows 10, and Linux Mint on it natively. The processor is supposed to run at a base clock of 3.7GHz and boost ...
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Python calculation incredibly slow Ubuntu 20.10

My laptop is an MSI with a hexcore i7-9750H CPU, NVIDIA RTX2060 6GB GPU, a 1TB SSD, and 64GB of RAM. Since "upgrading" from 18.04 to 20.10 the performance is abysmal. I work most in Python ...
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How to temporarily free RAM and restore it later?

I sometimes have a memory and CPU hungry app running (for example MediathekView) and want to start another (for example FlightGear) (both from terminal, if that matters). If I just start both, my PC ...
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How to set minimum CPU frequency?

I am trying to set the minimum frequency of my CPU in ubuntu. Basically, the minimum my CPU runs in Windows is 2%, and in ubuntu it is 19%. Is there some way to change it from 19% to 2%? I tried using ...
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Can you run Compute Benchmark (GPU) using Geekbench 5 on 20.04?

I would like to benchmark test my CPU and GPU. I have installed GB5 and successfully run the CPU testing from the command line using ./geekbench5. I was wondering if I could also run the GPU testing ...
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Harware Error: CPU 3: Machine Check: 0 Bank 3: ba00000000. What is the problem?

I had built a PC with the following hardware: Motherboard: MSI Tomahawk X299 RAM: 16GB 2666Mhz HyperX CPU: Intel i9-7940X SSD M.2.: Western Digital Green 480GB I had no problem accessing the BIOS as ...
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cpufreq is missing from /sys/devices/system/cpu/cpu0

/sys/devices/system/cpu/cpu0# ls cache crash_notes_size firmware_node microcode power topology crash_notes driver hotplug node0 subsystem uevent I searched for ...
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cpu max frequency

I am trying to change my cpu max frequency. I have tried with tlp, cpupower, and the solution in this same forum (the one that goes: for x in /sys/devices/system/cpu/*/cpufreq/; do echo 1700000 | sudo ...
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Any issues running 20.04 with a Ryzen 5000 CPU?

I'm thinking about building a new computer. Would like to get a Ryzen 5000 series CPU (if I can find one.) I know support for the 5000 series was added to a later linux kernel than is included with ...
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System activity: CPU percent “unknown”, what is this?

I am on Kubuntu 20.10 and it is all up to date. In System Activities I see a good number of process where the CPU % column lists "unknown". Some of them have a "nice" level of -...
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Watchdog: BUG: soft lockup - on Ryzen 9 3950X CPU

We recently built a machine equipped with: Specifications CPU AMD Ryzen 9 3950X RAM 128GB DDR4 3000MHz SSD 1TB + 2xHHD 6TB GPU NVIDIA GEFORCE RTX 3090 24GB OS Ubuntu 20.04 LTS PSU 850W ...
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Every day or two, the CPU VM receives up to 250% load for several hours

The load during the day does not exceed 5%, and these bursts have nothing to do with our side. I use Google Compute Engine f1-micro (virtual machine). OS: Ubuntu 16.04 RAM: 600 MB CPU: 2 core ...
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How to get munin to monitor and show CPU temperatures

Ubuntu 18.04 system has kernel module coretemp kernel module installed: % lsmod | grep coretemp coretemp 20480 0 It also has command-line utilities lm-sensors to check temperatures ...
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Xorg process - what is it, how to disable it

Big problem: my computer used a lot of cooler work, so I checked the processes by: terminal -> Top .. and the process Xorg uses about 40% of my CPU. Enough! Discovered: xorg is a display server (...
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Ubuntu Freezes with Core Multi-Processing

I have installed Ubuntu 20.04 on my Lenovo P50 laptop. Immediately, I noticed Firefox would freeze within seconds of opening and, after a while, so would the operating system. After much ...
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Dell Vostro Fan Control

I've installed Ubuntu 20.04 on my Dell Vostro 5490 and it's all good but fans speed. So browsing through the internet i found pwmconfig and i was trying to make it work, the problem is (I don't know ...
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How to change frequency range for intel_pspace performance govenor

I want to set higher CPU frequency on Ubuntu 20.04 based system (KDE neon) with 5.4.0-58-generic kernel. The CPU is Intel(R) Core(TM) i7-8700, with the hardware limits 800 MHz - 4.60 GHz. Setting sudo ...
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Hyperthreading (smt) set to 'notsupported' on i7-10875H 8/16 processor running Ubuntu 20.04

My simple question is why? Specs for i7-10875H Num of Cores 8 Num of Threads 16 BIOS hyperthreading enabled $ lscpu | grep -e Socket -e Core -e Thread Thread(s) per core: 1 Core(s)...
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Switching to AMD ryzen 5900x or 5950x. Any stability problem with 20.04 LTS?

I only run codes (C, Python) on my desktop which I am thinking of upgrading, either to AMD ryzen 5900x or to 5950x. I will be using ubuntu 20.04 LTS (only, no windows). Does anyone have any experience ...
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Why does it say I have “x 2” processor?

Trying Ubuntu. It says there is have "x 2" processor (View image). What does this mean? I could not find anything online. Please help, thanks

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