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Questions tagged [multi-core]

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0
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1answer
54 views

Ubuntu 18.04 Xeon E5450 on p43-a7 socket 775 only one core working

I am new to Ubuntu, so i screwed something and idk what. After manually installing nvidia drivers, my Ubuntu recognize only one of four cpu cores. Architecture: x86_64 CPU op-mode(s): 32-...
0
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0answers
55 views

Run gnome-shell on multiple threads/cores on Ubuntu 18.04.2 LTS

I am having trouble running gnome-shell smoothly as whenever I try to do any kind of action from moving a window to showing/hiding all applications the gnome-shell process jumps to 100% CPU usage and ...
16
votes
2answers
3k views

How can one restrict the number of CPU cores each user can use?

We have a computer whose CPU has 32 cores and it's going to be used for running programs by a few different users. Is there any way to restrict the number of cores each user can use at any time so ...
0
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0answers
64 views

OS showing only one processor

I have 4 core processor but the system is only showing one core. Note: I am using acpi=off in grub entry. If I don't use it, my system crashes. What to do now? $ inxi -C CPU: Single core Intel ...
0
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0answers
111 views

Ubuntu automatically clean zombie and sleeping process

Is there a way how I can cleanup zombie process automatically? How can I clean up the zombie and sleeping process automatically?
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0answers
100 views

At what point should I worry about high temperatures?

I just got a new system76 galago pro. It's nice. It has 8 threads and lots of memory. I do a lot of multicore computing in R, and a lot of my jobs are borderline between something that I'd do ...
3
votes
1answer
342 views

How to list PIDs (procesees) for one CPU core only?

One CPU core is running at 100% I have one CPU core running at 100% for a minute and then it drops to about 5%. Immediately after that a different CPU core starts running at 100%: Using bash and ...
3
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2answers
4k views

Unable to use all cores or threads

There are several threads on this subject, however none seem to help in my specific predicament. As the title suggests, I am unable to take advantage of all four cores and threads on my Intel i5-7600T ...
0
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1answer
361 views

Application does not display with Core i5 7400

I'm using a core i5 7400, no off board video card, the motherboard is Asus B250M-PLUS-BR, Ubuntu 16.4 16.10 or 17.4 which has the bug of not opening in the desktop some application, for example ...
2
votes
1answer
2k views

Ubuntu using/enabling only 1 of 4 cores?

CPU: Intel Core i7 870 ... number of cores = 4 I installed Ubuntu 17.04 64-bit (twice; and even tried Ubuntu MATE 17.04 64-bit - same thing). It seems that only 1 of 4 cores is used: $ lscpu ...
0
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0answers
72 views

CPU dual core both cores syncing only after reboot

I have a Toshiba Satellite C850-1DD Notebook with dual core Intel(R) Celeron(R) CPU B830 @ 1.80GHz with 64-bit Ubuntu 16.04.2 LTS installation. Approximately 90% of the cases when I boot the system ...
1
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3answers
2k 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 ...
2
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3answers
1k views

unzipping multiple files at once

I have thousands of .zip files in one folder, I want to extract those using command or script, each .zip file to it own folder. I wish to run the unzip process multiple times. How can i do that?
4
votes
1answer
109 views

How to enable 256+ cores in Yakkety Server

Yakkety Server uses generic kernel flavor. It is 4.8.0 Linux kernel. While running on Intel KNL processor I cannot see cores above 256. user@ubuntu02:~$ grep processor /proc/cpuinfo | wc -l 256 ...
0
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0answers
311 views

How can I experience CPU steal time on co-existent VMs?

I've already had an Openstack cloud with two compute nodes each having 8 physical cores. I intend to make a scene that two or more VMs contend for the same shared core on a single host so CPU steal ...
3
votes
2answers
901 views

How to force “archive manager” (file-roller) to use all cpu cores?

I am using Ubuntu's Archive Manager (file-roller) to compress (tar.gz) some large files and directories. Often this takes a long time, because this program uses just one of my eight CPU cores. Is ...
3
votes
1answer
629 views

Any way to multithread dpkg-deb

Compression for a 500MB deb takes a long time. I still need the compression. Is there anyway to multithread it? There's pxz, pigz, pbzip2. Is there any way I can get dpkg-deb to use one of these. Or ...
3
votes
1answer
178 views

CPUs are overused with internet browsers, maybe Ubuntu+i5+JS don's work well

I'm having trouble with the Ubuntu 14.04 on PCs Intel NUC i5 8 GB RAM SSD HD. They are used mostly with Google Spreadhseets and are high usage of internet browsers and JS applications. PCs are quite ...
0
votes
1answer
646 views

Applications running slower with multiple threads

I have a 40-core server running Ubuntu 14.04 LTS. I am using an application with multithreading capability. I find that running the application with increasing numbers of threads improves run time ...
0
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2answers
482 views

problem during installing multi2sim simulator

I'am new to ubuntu and when I'am trying to install multi2sim I get this error: CXX WorkItemIsa.o WorkItemIsa.cc: In member function ‘void SI::WorkItem::ISA_V_CVT_I32_F32_Impl(SI::Instruction*)’...
0
votes
1answer
75 views

How to make Hyper tread on in Ubuntu 15 linux

What is terminal command to make 'on' a hyperthread in Ubuntu?
0
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1answer
67 views

Which programs on Ubuntu support 8 processor cores? [closed]

I'm now using the Ubuntu virtual machine through Google Cloud service with 8 processor cores. I want to check if these cores work simultaneously. For doing that I have to run such program which ...
0
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1answer
384 views

Intel Core i7-3612QM multi-core CPU not being utilised properly

I have a Dell Inspiron 7520 with an Intel Core i7-3612QM CPU that repeatedly cycles through 100% usage of each individual core while barely using any other core as shown in the screen shot below. ...
0
votes
1answer
320 views

Disable multicore in Ubuntu14.04

In windows 7 msconfig can disable different cores of the Operating System after a restart as per this link. Is there a similar option in ubuntu that can explicitly disable all cores but one?
0
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1answer
712 views

Start windows application with single core in wine

I am trying to run Broken Sword 4 in wine on Ubuntu 14.04. It installed perfectly. However, the usual blackened character problem occurs. This is caused by multicore CPUs. So I have to explicitly ...
3
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3answers
3k views

Indicator displaying current CPU frequency and usage

Unfortunately, it seems that cpufreq indicator is only showing an icon indicating proportional frequency instead of precise number I would like to see. Is there any indicator showing actual CPU ...
1
vote
1answer
764 views

Does the Linux OS run on one core in multi-core system?

If I use a multi-core processor computer, does the Linux OS run on one core or is it distributed to multiple cores? (I know that scheduled processes can be executed on multiple cores.)
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votes
3answers
110k views

Cores vs Threads: How many threads should I run on this machine?

How many threads should I run on this machine? My lscpu says there are 96 cores. Are those physical cores? What is the maximum and optimal thread that I can run on this machine? https://...
2
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0answers
2k views

Why aren't all of my CPU cores always detected in ubuntu 14.04 with an Intel Core Duo 2 CPU?

I'm using Ubuntu 14.04.2 LTS with kernel 3.16.0-38-generic #52~14.04.1-Ubuntu SMP Fri May 8 09:43:57 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux. Computer model: iMac Late 2009 ( https://support.apple....
1
vote
0answers
171 views

How to forcefully run two thread on two cores

I have a C Code in linux, in which I have two Pthreads. What I have to do is that, I want every thread running on different Cores. For Example, I have two cores, so one thread should execute on core1 ...
2
votes
1answer
762 views

Not all cores registered, Ubuntu 14.04 i7-2630QM

I'm not sure when this happened, but for some reason my processor is only using two out of 4 physical/8 logical cores. I've tried to remove acpi=off from /etc/default/grub with no luck. I've changed ...
3
votes
1answer
803 views

Gimp uses only one CPU when applying a Gaussian Blur

If I use "Selective Gaussian Blur" in Gimp, only one CPU gets used. My PC has four. Is there a way to tell Gimp to use all available CPUs? Some operations take quite long, and this would reduce the ...
1
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0answers
2k views

Support for cores revisions 0x17 and 0x18 disabled by module param allhwsupport=0

I was wondering if there is a fix for this problem, as every time I boot my laptop this message comes up. Is there any way to get rid if it? Thanks.
2
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0answers
71 views

Reserving a core for system processes to prevent wedging

I am working on a multi-core machine (running Ubuntu 14.04 server), where some programs seem to use up all resources causing wedging. Is there a way I can reserve one core for the os processes to ...
9
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2answers
7k views

avconv on multiple threads

Is it possible to run jobs on multiple processor or threads to speed up avconv? Is there a feature in progress, if not I wonder why?
3
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0answers
122 views

One of my two cores suddenly flatlines at zero percent

I've been using Ubuntu for about three months, and twice now the first core of my dual-core laptop suddenly flatlined at zero percent for no apparent reason, while the second one seemed unaffected. ...
2
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2answers
1k views

How to limit users to N cores?

I have an SSH server where users login to do various tasks. The problem is I have 4 cores, and one user is running tasks on 4. How can I limit the number of cores any given user can use? This is not ...
0
votes
1answer
225 views

Force to use specific number of cores

I am using Ubuntu 13.10 on laptop that has Intel i5 (4 logical cores). Question: Can I force Ubuntu to use only one or two cores? Explanation: I want to test how my application performance scales ...
3
votes
1answer
1k views

Why does /proc/cpuinfo say “cpu cores: 2” on an AMD FX-4100 Quad-Core Processor

I'm trying to figure out how to interpret my /proc/cpuinfo. I've got an AMD FX-4100 quad-core and cpuinfo gives, as it should, 1 'physical id', 4 'core id's and 4 'siblings', but why does 'cpu cores' ...
-1
votes
1answer
5k views

Ubuntu 12.04 LTS iso for 64-bit intel i7-4700MQ quad core laptop [duplicate]

I have a Lenovo Ideapad with Intel i7-4700MQ processor. Which Ubuntu iso should I download for installation?
1
vote
1answer
8k views

How to enable VT-X to adjust the processor of a vm

I am using Oracle VM VirtualBox. I've been trying to adjust the process of my Virtual Machine but the slider of the Processor on the Processor tab is disabled. As far as I know, VT-x should be enabled ...
4
votes
1answer
13k views

Display clock frequency per core using Conky [duplicate]

I am using Conky to display a lot of information of my system. I managed to display the load percentage per core. But I do not know how to display the clock frequency of each core. What I have now is: ...
19
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3answers
71k views

How do I enable multiple cores in my virtual enviroment?

I've installed Ubuntu in a virtual environment using Oracle VM VirtualBox Manager and it works great. However I'd like to enable multiple cores - as seen in the image below my Windows machine has 2 ...
1
vote
1answer
479 views

How can I create ISOs quickly using all 16 cores of a Parallella board?

I have a large video collection (over 900 disks). Using Handbrake to rip to .mp4 is painfully slow, especially when ripping BRD. I found another solution that will play back ISOs, but I want to be ...
6
votes
1answer
4k views

How do I enable all four cores on my Toshiba P70-A notebook? (only one enabled now)

I recently noticed my computer is highly sluggish (recent install of Kubuntu 13.04 by the way). I have a Toshiba Satellite P70-A PSPLPC-01Y007 laptop with an Intel i7 quad-core, 16 GB of ram. It ...
0
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1answer
774 views

Logical / Physical processors supported [duplicate]

Can anyone tell me the maximum number of logical as well as the maximum number of physical processors supported in the latest release of Ubuntu? In the documentation online, I've found the 8 ...
1
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1answer
3k views

How to enable concurrency in grub2?

While reading about speeding up Linux, particularly the boot process I found that concurrency is suggested for multiple core PC's. It appears that this setting was easily achieved in legacy GRUB, ...
1
vote
1answer
588 views

Firefox multi-core when opening a list of bookmarks?

Is there a way to configure Firefox to use all available cores when opening a list of bookmarks? For example, if I open a list of 10 bookmarks in one go, I would like Firefox to use all 4 cores ...
54
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8answers
54k views

Multi-Core Compression tools

What compression tools are available in Ubuntu that can benefit from a multi-core CPU.
0
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2answers
555 views

my internet is suddenly slow

im running Ubuntu 12.10 and it works like a charm... but one problem, when i updated my software everything seemed OK until i noticed that my internet speed very slow. i had about 5-6 MBPS but it ...