Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

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.

0
votes
0answers
26 views

Python use only one thread

I've got i7 8550U and 18.04.1. Python while using Jupyter notebook is using only one core out 8 possible. For other tasks ie. Java it uses all cores, but for python it's limited to only one. On the ...
0
votes
0answers
31 views

Ubuntu 18.10 CPU scaling_max_freq is lower than hardware capability

I currently have a Ryzen 1700X processor and I when run $ cpupower frequency-info I get the following output: ... hardware limits: 2.20 GHz - 3.40 GHz available frequency steps: 3.40 GHz, 3.00 ...
0
votes
0answers
27 views

Ubuntu Server showing 8 cores instead of 12 cores

I have a Dell r710 xeon x5670 system, having 2 processors and 12 cores in it but system is showing 8 cores instead. Also hyper-threading option is not available in the BIOS setting. System monitor ...
0
votes
1answer
23 views

SSH, Webmin, etc. stopped working after CPU upgrade

I upgraded the CPU in my home server: i3-3220T -> E3-1265L V2. The upgrade was succesfull, the server started proerly, however some services stopped working. I cannot use SSH now. I checked the ...
0
votes
0answers
13 views

G860 CPU to i7-3770 CPU + More RAM - advise requested [duplicate]

I have a G860 CPU installed on an Asrock H61M-DGS Motherboard - works well under Ubuntu 16.04. Now to the question: If I was to purchase and install an Intel Quad Core CPU say i7-3770S could I ...
1
vote
1answer
108 views

mysql 5.7 is working slow on ubuntu 18.04 LTS

I am currently using ubuntu 18.04 server ( with 8GB RAM , 100 GB HDD & Intel I3 processor ) for project deployment, & am using mysql 5.7 database server , but whenever I tries to insert data ...
0
votes
0answers
34 views

meltdown_v1, spectre_v2 capabilities on 18.04 LTS [duplicate]

Hardware more than Operating System related but: When running cat /proc/cpuinfo from the terminal I am given the lovely output: bugs: meltdown_v1_spectre_v2_speculative_bypass The infected CPU is a ...
0
votes
1answer
110 views

High CPU usage. Is my Ubuntu installation broken?

The command Xorg is always using at least 25% of cpu. I have no clue how to fix this and my fan has be running non stop for a few weeks. I'm considering a complete reinstall but before I delete ...
0
votes
0answers
36 views

Is AMD A8-5545M APU with Radeo HD Graphics supported? [duplicate]

Looking to do a dual boot on my HP laptop that has a AMD A8-5545M APU with HD Graphics but need to know if the latest version supports it (18.10).
0
votes
0answers
11 views

How to map a task to a specific CPU core and block any other task on this core?

I wonder if I use taskset to map a task to specific CPU core, does this also block other task running on this core as well? If not, what is the correct way to do that? Thanks.
0
votes
0answers
52 views

Is irqbalance a bad thing?

I am using cpufreq gnome extension and it give's me warning irqbalance detected. Is that something to worry about? And if I somehow stop irqbalance will that affect the processor?
3
votes
4answers
309 views

One core goes to 100% usage and activate fan on Ubuntu 18.10,

I recently switched from Windows to Ubuntu 18.10 with this Notebook, and despite is not a serious problem I noticed that often the fan turn on for ~3 sec. then turn off for ~5 sec. and then turn on ...
0
votes
1answer
74 views

CPU frequency at minimum, both on AC and battery. BIOS problem?

My CPU frequency is stuck around the minimum 800 MHz on my Dell Precision 5520. I've exhausted the solutions out there. Background My problem is quite similar to this question, but just that my ...
0
votes
0answers
48 views

Ubuntu 18.04.1 random crashes and slow cpu

I have a MEDION AKOYA S6217T MD99051 Laptop running Ubuntu 18.04.1. My Problem is, that it randomly (seems like it) crashes. Sometimes a few minutes after reboot, sometimes long after. With crash I ...
0
votes
0answers
113 views

Core temperature above threshold, cpu clock throttled but my CPU tempature is just fine

The tempature of my CPUs are just fine, there is no problem and the CPU usage for each CPU is usually under %10. But when I check dmesg, I usually see CPU errors about tempature above threshold but it'...
0
votes
1answer
504 views

nproc produce results inconsistent with hardware report

I check the manual to count cpu DESCRIPTION Print the number of processing units available to the current process, which may be less than the number of online processors it output $ ...
2
votes
1answer
61 views

CPU causing low gaming performance

Ok, first, english is not my native language, so I apologize for any poor phrasing. Second, I'm still learning about Linux, Ubuntu 18.04 to be more specific. This is the first time I use this OS and ...
0
votes
0answers
20 views

Which processor could best suit and efficient for Ubuntu? [duplicate]

I want to buy a laptop to run Ubuntu specially, i was wondering if intel celeron or Pentium processor is good for a light os like ubuntu.. please suggest i want to buy the cheapest and best
0
votes
0answers
194 views

CPUs switching to very low speed in 18.10

Since updating to Ubuntu 18.10, CPU power management seems to be having problems. I think (not sure) it occurs when the laptop starts running a little hot, and the intel_pstate switches the CPUs to a ...
0
votes
0answers
21 views

How to apply maximum load on all hardware parts

I have a small server (HP Proliant Gen8) and I'd like to know if with my four installed HDDs plus the SSD, a Xeon E3 1270v2 and two 120mm fans a pico PSU with 160w would be enough. In order to get ...
1
vote
1answer
149 views

Random freezes on Ubuntu 18.04 with error: “watchdog: BUG: soft lockup - CPU#11 stuck for 22s” followed by “NMI watchdog hard LOCKUP”

About once a week, my PC will completely freeze up. I can't ssh into it, the mouse will work for a few seconds and then stop, REISUB doesn't work, the only solution is a hard reboot. I can't find ...
0
votes
0answers
32 views

Install Ubuntu Server on Amd64 and move HDD to Intel

How safe is it to install Ubuntu Server 18.04 on a hard drive attached to a AMD PC and then move the drive to a Intel Xeon server? The reason for this is that I am unable to stay long enough around ...
1
vote
0answers
51 views

Cooling fan on laptop is working on high speed when CPU load is low [closed]

Usually when I'm using my laptop for simple tasks the cooling fan is in its standby mode: I can hear it working just slightly. It would activate when I use more programs which are heavy on CPU power, ...
2
votes
3answers
553 views

18.10 frozen after installing on an Xiaomi Mi Notebook Pro

Here are the specifications of my laptop: Xiaomi Mi Notebook Pro (i7-8550U) Laptop Review Processor: Intel Core i7-8550U Graphics adapter: NVIDIA GeForce MX150 - 2048 MB Memory: 16GB DDR4-2400 ...
0
votes
1answer
55 views

VT-x is enabled, but ubuntu 18.04 doesn't show it

I was running VMWare Workstation 14 on Ubuntu 16.04 for months with no problems. After upgrading to Ubuntu 18.04 I started getting a VT-x not enabled error message. VT-x is enabled in the BIOS. I ...
0
votes
2answers
35 views

Distribute workload among different CPUs

On my Ubuntu 16.04, I am running a program that is relatively expensive in terms of CPU usage. It takes quite much time to finish, and other tasks (like browsing the web) get slower as a consequence. ...
1
vote
0answers
73 views

CPU Frequency Error. Ubuntu on Raspberry Pi

I have Ubuntu 18.04.1 installed on my Raspberry Pi and two USB devices attached: One small bluetooth adapter and one small Wifi adapter. I am connecting to the wifi network with wpa_supplicant like ...
0
votes
0answers
112 views

Sluggish/Laggy Ubuntu - gnome-shell too much CPU

it started off from super sluggish behaviour on my Ubuntu 18.04 VB on Windows 10 Host. I updated and upgraded all of the packages. Updated Windows. Grepped for errors in syslog. And then I noticed ...
0
votes
3answers
44 views

Does opening a new terminal tab use equivalent system resources to opening a new window when running scripts in parallel?

Is opening a new tab in the terminal window equivalent to opening a new tab in terms of resources? I need to run 16 scripts in parallel. I do not know whether opening tabs or new terminals is the ...
0
votes
2answers
86 views

How to clear L1, 2 & 3 cache

What are the commands necessary to clear the L1, L2 and L3 cache in ubuntu? Can this be done utilising the shell or do I need a higher level language?
2
votes
1answer
607 views

Ubuntu 18.04.1 LTS High CPU Usage and Running SLow

I have a Toshiba Satellite C855d-C5110 CPU: AMD:A6 RAM: 8GB HardDrive: A brand new SAMSUNG 860 EVO Series 2.5" 250GB SATA III 3D NAND Internal Solid State Drive (SSD) I recently installed Ubuntu 18....
0
votes
0answers
34 views

OS frezzing ever time I make upgrades on Ubuntu Mate

I am desperate, I have tried all and seen all video I have found in Internet. I am trying to upgrade my Ubuntu Mate 16.04 to 18 I been using the sudo do-release-upgrade command, and everything ...
0
votes
2answers
92 views

How do I fix a ASUS Eee PC to run Ubuntu 18.04 with “This kernel requires an x86-64 CPU, but only detected an i686 CPU”? [duplicate]

My son has an Eee PC and he tried to turn it into a Chromebook. It did not work and the computer is stuck on trying to load chromium. I asked an IT Tech at our school how to fix it. He suggested ...
0
votes
0answers
38 views

cpu usage is high under battery power ubuntu 18.04

I've noticed since the very 1'st day I installed ubuntu 18.04 my battery life surprisingly reduced.so I checked system monitor. I noticed that only one of my CPU core is always run on high usage while ...
1
vote
1answer
71 views

How do I turn the fan on?

I have a fairly oldish system76 laptop and the fan does not turn on automatically any longer, so the CPU overheats and the laptop powers off all the time. I opened it and cleaned it from dust. I also ...
0
votes
0answers
45 views

CPU Scaling governor on tlp

I'm configuring tlp on Ubuntu, and I'm wondering if "powersave" governor will affect my device and not reducing the performance speed. If it's reducing the performance is it possible to have the ...
0
votes
1answer
170 views

Why cpu frequency changing and it is not possible to stop this?

I am trying to disable cpu frequency scaling and limit the processor to a single speed. But something seem to be changing processor speed constantly. Any ideas on why this is happening? I am on 16.04 ...
0
votes
0answers
115 views

Overheating issues after the new update 18.04 LTS

today after installing the new security update i noticed the temperature rising 12 degrees (from 50C to 62C while not using any apps) anyway i can fix it? i installed tlp which made the laptop faster ...
0
votes
0answers
207 views

Windows Vs Ubuntu 18.04.1LTS: in T470 and XPS 15: More battery usage. High usage CPU/TLP is not solve problem? Same issue with Mint vs Win10?

I installed Ubuntu 18.04.1 LTS dual boot on windows 10 Enterprise than I like it but I decide to uninstall it. Because with out doing any thing I got high CPU GPU usage and battery life than in ...
1
vote
0answers
203 views

How can I lock CPU frequency in Ubuntu 16.04?

It's a Server (Dell PowerEdge R730xd) The CPU is Intel Xeon E5 2630 v4 2.2GHz The OS and kernel is Ubuntu 16.04 and 4.15.0-33-generic The current settings are as follows: intel_pstate is disabled ...
1
vote
1answer
89 views

Will 2x Intel(R) Celeron(R) CPU N2840 @2.16GHz support 64bit Ubuntu18.04? [duplicate]

I have : 2x Intel(R) Celeron(R) CPU N2840 @2.16GHz . Will it support 64bit Ubuntu18.04 ? I have checked using lshw -class CPU that width is : 64bit. But http://releases.ubuntu.com/18.04/ says I ...
0
votes
0answers
225 views

Ubuntu 18.04 Dell XPS 9560 Overheating with minimum load

Since I upgraded Ubuntu 16.04 to Ubuntu 18.04.1 LTS on my Dell XPS 9560 I faced many issues like not recognized the NVIDIA GPU and dead touchpad. Right now the issue is that even with a minimum ...
0
votes
0answers
218 views

Ryzen System Freezing When Under Heavy Load

I have been having problems with my system completely locking up (no keyboard or mouse input, no display output change) when the CPU is under heavy load e.g. Tensorflow or Raytracing with Blender. I ...
4
votes
1answer
153 views

Poor battery life and performance due to incorrect CPU frequency scaling

lscpu shows a minimum CPU speed of 1600MHz, rather than 400MHz as the actual minimum. This is absolutely killing my battery life (I get about 2-3 hours rather than the 8-10 I get under Windows on the ...
0
votes
0answers
31 views

CPUs not working at 100%

I recently upgraded my system to a i58400, 16 gb ddr4 and as os jumped from 16.04 to 18.04.1. Now im compiling Unreal Engine for Linux, so its supposed to be a heavy calculation and take many hours. ...
3
votes
1answer
299 views

Will Ubuntu enable RANDOM_TRUST_CPU in the kernel and what would be the effect?

According to this The Register article from 2018-08-28 and other articles, the Linux kernel version 4.19 will have a compilation flag named RANDOM_TRUST_CPU. Here's also a link to a mailing list entry ...
0
votes
0answers
119 views

Ubuntu 18.04 - one CPU core is always warmer

I recently began searching for a good Linux distribution and took a look at several of them. I'm currently set on the standard Ubuntu 18.04 LTS, but there is one thing that's troubling me. All ...
0
votes
0answers
102 views

Can acpi-cpufreq drvier works for Intel Xeon processor?

I want to use the acpi-cpufreq driver (instead of intel_pstate) to change my CPU frequency to do some researches, for the reason that I want to use the userspace governor. But here is the problem: My ...
1
vote
0answers
27 views

Bad temperature management on X1 Yoga

On my new ThinkPad X1 Yoga running Ubuntu 18.04 with thermald and TLP I noticed very annoying behaviour by the temperature management software: The computer runs hot due to intensive load. The CPUs ...
1
vote
0answers
103 views

Ubuntu 16.04, root command sh took 400% cpus usage even after fresh reboot

I recently found out my Ubuntu has a process (shows in images) always took about 400% cpu usage for nothing. It is always there even I rebooted my PC and nothing has been done yet. I tried to kill it, ...