Questions tagged [multi-core]

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Ubuntu 20.04 Multicore CPU scaling/frequency issues on i7-10510U

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 ...
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Ubuntu Studio (sometimes) i7 core stuck at 100%

Distributor ID: Ubuntu Description: Ubuntu 20.04.3 LTS Release: 20.04 Codename: focal Hello. I run Ubuntu Studio in an Acer Aspire V Slim which I upgraded with SSD and a Polaris_CX motherboard....
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1 answer
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Multiprocessor and 20.04

I just upgraded my bi-Xeon server with 20 cores/proc (i.e. a 40 cores server) from 18.04 to 20.04 and now the system is only viewing 1 processor! The BIOS is correctly seeing the whole system (2 procs,...
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How to manage number of cores used on my institution's server

I'm using a remote server where I'm not supposed to request more than 24 of the 100 cores. I'm running a couple of R scripts which seem to be using too many... How can I tell, in htop, how many cores ...
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why the number of cores is different than expected?

I am trying this solution to a similar answer , in order to determine how many cores my systems have so I try the following commands 1) cat /proc/cpuinfo | grep processor | wc -l cat /proc/cpuinfo | ...
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Which 25 % usage of CPU is the most effective for a long-term calculation?

When we run a program like BOINC which is an endless calculation, we can let it work at a particular CPU power. Let's try to set 25 % on an ordinary desktop computer (multi-core single cpu air-cooling)...
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Parallel processing isn't working with multi cores in ubuntu 20.04

My laptop has 4 cores. Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian Address sizes: 39 bits ...
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1 answer
95 views

One CPU works more harder than others

Recently I have a problem with my CPU. Without opening any other program, a CPU starts working harder than normal. Characteristics:
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2 answers
244 views

Multiprocess per single core

I have 6 cores and want to run 12 processes in the same time in parallel .. I'm using mpirun but sucked and confused in the option that I will use for multiprocess per core .. the command of 6 ...
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Why is Libreoffice using only one core?

When I use libreoffice calc for big table (around 100 000 lines), when I make operations on the filters, libreoffice freezes for some times while calculating, and i've seen in the CPU use that it's ...
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10 votes
4 answers
19k views

AMD Ryzen 5 3600 + Ubuntu 20.04 problems

I have Ryzen 5 3600, Gigabyte X570 GAMING X and Radeon RX 580 Series. I installed Ubuntu 20.04 and it is loaded with kernel parameter 'acpi=off' but now system recognize only 1 core(lspcu, cut /proc/...
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How to enable all the cores available in ubuntu 18.04

When I executed the command: sudo lshw | grep core It's showing following output: cores:2 cores_enabled:1 threads:2 How can I enable both cores? (Ubuntu 18.04). Edit: No options visible in BIOS ...
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8 votes
1 answer
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How do I disable a specific CPU core at boot?

I have a 16 core Intel Xeon processor that successfully boots into the BIOS and GRUB, but fails to load Ubuntu (or any operating system). It turns out that core #14 is the cause of all the issues (...
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1 vote
1 answer
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AMD A10-4600M has 2 cores instead 4 problem!

I have Ubuntu 19.04(this problem occurs in 18.04 and 12.04 too), AMD-4600M processor. A lscpu command, settings and /proc/cpuinfo say that my processor has 2 cores, 2 threads, 2048M l2 cache. But I ...
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1 answer
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How do I backup my file system with tar and multi-thread?

I would like to backup my file system and do it with parallel. I found this guide: https://help.ubuntu.com/community/BackupYourSystem/TAR Where they give me the command: tar -cvpzf backup.tar.gz --...
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5 votes
2 answers
5k views

multi-core CPU usage

I am using the Windows Subsystem for Linux (WSL), and I am unexperimented in the capabilites of linux. Recently, I've been wanting to get better insight in the CPU usage of processes, but I am getting ...
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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-...
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24 votes
2 answers
21k 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 ...
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1 vote
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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 ...
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360 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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3 votes
0 answers
176 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 ...
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3 votes
1 answer
977 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 ...
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4 votes
2 answers
11k 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 ...
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1 answer
461 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 ...
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3 votes
1 answer
5k 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 ...
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2 votes
3 answers
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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 ...
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3 votes
3 answers
4k 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?
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  • 333
4 votes
1 answer
141 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 ...
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557 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 ...
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  • 93
3 votes
2 answers
2k 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 ...
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5 votes
1 answer
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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 ...
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2 votes
1 answer
220 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 ...
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0 votes
1 answer
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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 ...
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0 votes
2 answers
739 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*)’...
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0 votes
1 answer
107 views

How to make Hyper tread on in Ubuntu 15 linux

What is terminal command to make 'on' a hyperthread in Ubuntu?
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1 answer
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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 ...
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0 votes
1 answer
436 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. ...
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1 answer
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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?
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1 answer
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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 ...
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4 votes
3 answers
7k 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 ...
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1 vote
1 answer
1k 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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57 votes
4 answers
221k 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://...
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2 votes
0 answers
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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....
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1 vote
0 answers
762 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 ...
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2 votes
1 answer
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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 ...
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3 votes
1 answer
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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 ...
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1 vote
0 answers
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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.
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2 votes
0 answers
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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 ...
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  • 175
9 votes
2 answers
8k 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?
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3 votes
0 answers
129 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. ...
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