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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3
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0answers
45 views

High CPU with web streaming videos

Every time I start watching some video within a browser (both Firefox 40.0 and Chrome 44.0.2403.157 64-bit with no extensions) the CPU usage gets 100% (according to htop and system monitor) freezing ...
-1
votes
0answers
15 views

basic instruciton pipelining [on hold]

Today, I was trying to understand pipelining in superscalar. If I have a C code and how this code is assigned to a superscalar processor. How are the instructions given to pipelines? If I have a 2 ...
0
votes
0answers
10 views

intel pstate, turbo always on cpu temp is 60 and without only ~43

I have a problem with pState on my Thinkpad L450 with Intel 5200U (broadwell) + SSD. When I use pstate, the turbo mode is nearly always turned ON and my CPU fan is also always ON because cpu temp is ...
0
votes
0answers
12 views

High CPU load with only Firefox* open — are my GPU drivers misconfigured?

*Firefox and as well a terminal window. I have two machines, both running Ubuntu 14.10* and Firefox 39. (*I've tried the troublesome machine with 14.04 as well with the same issue described below) ...
4
votes
1answer
121 views

How do I diagnose a sudden slowdown

Running a particularly compute-intensive task on my computer (Tecra W50) for more than a few seconds causes it to become very slow. Performance does not return to normal after the task completes. ...
0
votes
1answer
99 views

My cpu slows down after a while and does not recover

Sometimes, and I can't reproduce it (but it happens often enough - a few times a week at least) my cpu slows down below its prescribed minimum. This is an example cpufreq-info output from a minute ...
-1
votes
0answers
13 views

Installing 13.04 with a heating CPU [closed]

So, i have had Ubuntu 10.10 for a while now, and i never changed it. The problem is, my CPU heats really fast. It can last long if i dont run anything that uses a lot of memory. Dont tell me to change ...
121
votes
9answers
195k views
1
vote
1answer
37 views

Priority goes back to 20 after changing it to -10

I want to change the priority of a process in LTS 14.04. I used sudo renice -10 -p PID It worked fine, but after a while the priority of that process goes back to 20. What should I do to get rid ...
6
votes
1answer
4k views

High CPU usage while playing Flash and using Jupiter

Hi guys from what I see by Googling around it's a common problem but somehow all the threads I've seen end in "Oooo Flash is terrible" and the post dies there. I'm experiencing a very high CPU usage ...
0
votes
0answers
56 views

How to turn on AMD Turbo Core for AMD A6 6310 on Linux?

I use Lubuntu 15.04 I've noticed that my processor (AMD A6 6310) works at 1800 MHz frequency and not more, while AMD promised 2,4 GHz with Turbo Core option. How to enable Turbo Core option? $ ...
9
votes
4answers
12k views

Dropbox is taking too much CPU time. How can I fix it?

I recently noticed that Dropbox is taking about 50-90% of my CPU for more than just a few seconds sometimes - mostly when downloading/syncing many or large files. Still, I guess that even when ...
1
vote
0answers
22 views

gnome-keyring-d uses CPU too much

I'm using 14.04 LTS and always monitoring how much CPU resources are used by processes. gnome-keyring-d always attracts my attention by using too much CPU - almost 10%. After about 5 minutes OS ...
2
votes
2answers
1k views

Why does chrome use excessive amounts of CPU?

Synopsis For the past few weeks, i've really started to notice a process on my machine hitting the CPU. So today I have taken a look into it, to find that Chrome is running about 100% CPU. Is ...
0
votes
1answer
196 views

L1 + L2 cache hardware information with lscpu different to information from Intel & Windows

My CPU is an INTEL Celeron N2930 Bay Trail-M 1.83GHZ to (2.16GHZ Turbo) I get by typing lscpu in Terminal a different value of L1 + L2 Cache (Hardware Information) in comparison to the Intel + ...
1
vote
0answers
36 views

CPUpower sets the frequency by itself

Whenever I try to change the governor or CPU frequency with CPUpower, after 10-20 seconds it starts to go up again.Lets say I set the maximum CPU frequency to 1.5GHz it will go to 1.76GHz and then to ...
17
votes
3answers
38k views

How to determine if CPU VT extensions enabled in bios?

I know the command to figure out if a CPU can support VMware Workstation 8 or VMware Player 4: $ grep flags /proc/cpuinfo flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov ...
5
votes
1answer
561 views

High CPU by Firefox

For some days, Firefox has been consuming high CPU percentage while simply loading pages. It drops down otherwise. It often crosses 100% and even goes beyond upto 150% sometimes(!). I ran Firefox in ...
1
vote
2answers
303 views

How can I set the CPU frequency to always stay at its maximum?

Since I mostly use my laptop as a desktop, I'm trying to set its CPU to its maximum frequency. The CPU is an Intel Core i5-3337U (dual-core with Hyper-Threading), which caps at 2.5GHz (with 2 active ...
6
votes
5answers
7k views

Dropbox very high CPU usage without any actual data transfer

The Dropbox process constantly clocks more than 50% CPU usage sometimes going up to the higher 80s and 90s. At the same time it does not even upload/download the files it is supposed to. The progress ...
20
votes
5answers
164k views

Kernel requires an x86-64 CPU, but only detected an i686 CPU. How can I install Lubuntu/Ubuntu?

I'm trying to install Lubuntu on my laptop (sorta old 2005). [Laptop stats: Intel® Celeron® CPU 410 @ 1.46 GHz 1.47GHz, 448 MB of RAM] I press Install and this message appears: This kernel requires ...
5
votes
0answers
64 views

Ubuntu 14.04 - crontab @reboot hang my PC

Trying to resolving the bug for KWORKERS HIGH CPU, as suggested in this answer. I put in my crontab the row: @reboot echo "disable" > /sys/firmware/acpi/interrupts/gpe06 After the reboot, the ...
0
votes
1answer
45 views

GUI for monitoring CPU usage (including L1/L2 caches) in real time?

Is there any GUI available in Ubuntu which shows detailed CPU usage, including L1/L2 cache usage? So that while running a custom program, I can monitor the CPU utilization in detail. The default ...
3
votes
2answers
646 views

Nvidia 331 driver, Ubuntu 14.04 and Wine - lags, fps drops and surprising, temporary boost

I experience weird fps drops while playing games, mostly with Wine. Some tested games: Hearthstone - fps drops happens pretty often; interesting fact is that while browsing cards every page needs ...
1
vote
2answers
67 views

Increase processor utilisation of one application/program

I use ClustalX to align few unusually big sequences on my home desktop, this takes more than a week to complete and runs well below the maximum capacity of the machine. The top | grep clustalx gives ...
4
votes
1answer
205 views

My laptop is seriously overheating

I installed Ubuntu 15.04 alongside Windows 7 on my laptop about an hour ago, and within two minutes of running Ubuntu (both during the Live CD and post-install), my CPU temperatures reach 100°C. In ...
0
votes
0answers
16 views

Slight stutter navigating Ubuntu

Ubuntu newbie here, I am on Dell Xps 15z, and have installed bumblebee and all that jazz to get my graphics to work. I also installed TLP and CPUFreq. The problem I have is that when I'm navigating ...
2
votes
2answers
2k views

Can I install a 64-bit version of Ubuntu on my 32-bit machine?

I have 3 GB of RAM. lscpu Architecture: i686 CPU op-mode(s): 32-bit, 64-bit
0
votes
0answers
34 views

100% CPU usage bugs

I am affected by a series of bugs in which some program starts to run using the 100% of the cpu. Among these programs, compiz indicator-bluetooth cups udisks update-apt-xapi This started a couple ...
0
votes
2answers
352 views

Overclocking with Ubuntu

I overclocked my CPU in BIOS using a multiplier. Everything in Ubuntu still shows the CPU frequency is stock. Is the CPU running at stock frequency, or is it overclocked like it's supposed to be? Is ...
7
votes
3answers
778 views

Can't start Ubuntu - Package power limit notification

I used Ubuntu 12.10 on my current laptop for a couple of weeks without problems... Now there is no way to start it. When I try to boot Ubuntu during the startup process I get this error: [CPU0]: ...
1
vote
1answer
165 views

Should I activate the additional driver: Processor microcode firmware for Intel CPUs for intel-microcode

I have recently noticed that there is an additional driver called Unknown: Unknown here which was not there before: I have already read this, and understand why it is there, but my question is, ...
1
vote
2answers
4k views

How can I add the current CPU usage to my menu bar as a percentage?

I'm used to OS X and I use MenuMeters in my menu bar to monitor CPU usage as a percentage and memory as used/free totals. I really want to add this functionality in Ubuntu as I'm using it for ...
2
votes
0answers
70 views

what could possible take 100% cpu but not show up in (sudo) top

When I start intellij, which loads an "haxe" project at startup, it sometimes happens that intellij hangs loading. I than start htop (also tried top) with "sudo". iotop is also not showing anything ...
1
vote
0answers
43 views

Experiencing kernel panics, freezing and network errors. Please help!

I've had my own home server now for approximately 4,5 years and it's been running fairly smooth except for some disk breakdowns etc. Although, at various times I've been having issues where the server ...
0
votes
2answers
79 views

How to make cpupower not reset after each restart?

I use this command sudo cpupower frequency-set -u 1.5G To make the max CPU frequency to 1.5GHz but after restart it sets it back to default. How can I set this at boot ?
2
votes
2answers
635 views

Why Ubuntu 15.04 with kernel 3.19.0-15 is using significantly more power?

I've recently upgraded to 15.04 and immediately noticed significantly faster battery depletion and warmer case. My MacBook Air 6,2 would easily hold 10-12 hours on battery power with Ubuntu 14.10 and ...
2
votes
0answers
37 views

Debugging kernel running on AMD target from Intel host - how to return control to gdb?

I have compiled kernel 3.13.0-55 on Ubuntu on both AMD and Intel machines. I tried to copy compiled kernel to Intel target but it won't boot with that one. Therefore I have compiled the same version ...
2
votes
1answer
325 views

14.04, I have Disabled CPU throttling, but installing Atlas says: “CPU Throttling apparently enabled”

My PC is using ubuntu 14.04, and I need install Atlas. Atlas says: it need to disable CPU throttling, I have done the job to disable it. cat ...
0
votes
0answers
102 views

Proprietary Intel driver for processor microcode firmware seems to disable overclocking

I installed Ubuntu 14.04 on Asus B85M-G motherboard with G3258 CPU. This CPU has good overclocking possibilities and I was able to overclock it without hassle. Due to minor issues with hibernation and ...
1
vote
2answers
128 views

why does /proc/cpuinfo show a single processor on the BQ Aquaris phone?

phablet@ubuntu-phablet:~$ cat /proc/cpuinfo Processor : ARMv7 Processor rev 3 (v7l) processor : 0 BogoMIPS : 2072.57 Features : swp half thumb fastmult vfp edsp thumbee neon vfpv3 tls ...
0
votes
0answers
77 views

ffmpeg and libx264: Extremely high CPU temperature

Ahoy there! I turned my previous gaming rig into an Ubuntu Server 14.04 a year ago, and have been using it as a private nginx-rtmp live streaming server. Today I started to dabble with ffmpeg for ...
0
votes
0answers
54 views

CPU usage becomes extremely high after opening laptop lid after upgrading to kernel 3.19

So I recently upgraded my kernel to 3.19, and now, whenever I close my laptop's lid and re-open it, the CPU usage will spike to ~75% on all four cores of my CPU. However, Activity Monitor doesn't list ...
6
votes
1answer
129 views

Ubuntu not recognizing all CPU cores

I'm not new to Linux but I'm not an expert either, so bear with me if this is a stupid question. We're running Ubuntu 14.04.2 from a live session USB to test out a new dual CPU workstation. It has ...
12
votes
5answers
1k views

What is causing Ubuntu on MacBook Pro to have high CPU usage?

I installed Ubuntu 13.10 on a MacBook Pro 10,1. However, after installing, the kworker process consumes over 90% of CPU usage. I tried the following: (Suggested in this answer) Execute grep . -r ...
0
votes
0answers
25 views

CPU usage spikes to 75% and stay there after resuming from sleep mode?

So I recently upgraded my kernel to 3.19 (as part of a failed GNOME install that I have since undone), and now, whenever I close my laptop's lid and reopen it, CPU usage will spike after to minute or ...
1
vote
3answers
288 views

15.04 Only Boots in Recovery Mode After CPU Change

I moved from an FX-6300 to an i5-4690k so I could have an ITX-size computer, and transplanted both the hard drive and the GPU. Gnome wasn't very happy about this, so now when I try to boot normally, ...
1
vote
2answers
72 views

Check CPU and other hardware components in Lubuntu [duplicate]

Tell me please which are the best ways to check the temperature of the CPU and other hardware components in Lubuntu? It would be better if the applications could even tell me which are the normal ...
0
votes
0answers
65 views

Why is my Ubuntu running so slow?

AMD E2-1800 APU with Radeon(tm) HD Graphics × 2 4GB Memory (3.5 Usable) Gallium 0.4 on AMD PALM 64 Bit I know I have a slow processor but that shouldn't make my system run as slow as it is, even If I ...
1
vote
1answer
61 views

CPU benchmarking utility for Linux

I am looking for a utility that will benchmark CPU performance under single and multi threaded instances. At present I have an old rig with a dual core CPU (E7500) at 3.6 Ghz and I am looking at ...