Questions tagged [cpu]

The CPU (Central Processing Unit), is the chip in the computer that actually performs the operations and calculations that are done as a program runs. It is essentially what executes a program.

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How to fix CVE-2018-364 vulnerability

I have found a log in my /log/messages showing a CVE-2018-3646 error with the following link, (https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1tf.html). I have accessed the mentioned file-...
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How to determine cause of poor CPU performance - AMD 75F3?

I have 2 identical machines with pretty identical configurations, however one machine is performing much worse than the other. After some digging it appears the CPUs on one machine is simply slower ...
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Intel RAPL default power limits are too low

I am running Arch Linux with kernel 5.17.4-arch1-1 on Asus Zenbook 14 UX435EG Laptop. Specs: CPU: 11th Gen Intel Core i7 1165G7 (4 cores, 8 threads, TDP-down: 12W @ 1.20 Ghz, TDP-up: 28W @ 2.80 Ghz, ...
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Forgot how to boot linux when one CPU is dead

A computer has one CPU dead, and I found a while ago a solution to boot it using the other CPU by adding a simple flag in the linux line configured by GRUB. Without this option, the OS ubuntu 14.04 ...
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Why htop shows that total % CPU usage of processes is more than 400% on a 4 core/4 thread system?

I'm running some intensive tasks on my Linux (Manjaro) server and the CPU is at 100% of all its cores, but I saw that the percentages of CPU use per process sum to a much higher number than 400% on my ...
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cpu is overheating when working on linux mint

I don't think that I'm doing anything could affect my CPU temperature but it's shown that the temperature is high and my laptop is actually overheating, and is lagging when I'm working on Linux Mint. ...
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Changing CPU affinity on they fly has no result

so I am creating my own script to set priority and cpu affinity for important processes on my system, and I tried using taskset command, but it seems to do nothing. Here's sample: import psutil import ...
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What does 2 digit number which is shown for the line connecting IO device to NUMA node in lstopo represent?

I have taken a lstopo capture of the system using this command lstopo --output-format png -v > cpu_io.png. Below is the output of cpu_io.png This will list the basic IO devices connected to the ...
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is there a cli like : `cpu-cli app.sh`?

is there a cli that get the avg of CPU usage launching like usual cli tool like $ time app.sh without avoiding the forked process $ cpu app.sh avg 22.2% CPU usage max 55.5% CPU usage min 11.1% CPU ...
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Gnome Boxes Processor Count

VMWare Workstation 16 allows me to choose how many processors the VM may use. Does Gnome Boxes have this same option? I am unable to find it.
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Does my microcode need to be updated?

Does anyone know if everything is okay with my microcode? What does it mean when it says ''MDS: Vulnerable: Clear CPU buffers attempted, no microcode''? Is something wrong?
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What is eating up my CPU?

I am facing a difficult situation. 100% CPU but I cannot see a singular process using much in top or htop. I run this command: :~$ ps -eo pcpu,pid,user,args | sort -k 1 -r | head -10 %CPU PID USER ...
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Scheduling difference manual execution vs Slurm srun/sbatch

tl;dr A CPU intensive workload ignores the nice values of other processes only when started via Slurm sbatch/srun (not when manually started). I am running a systemd service which periodically gathers ...
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How to get overall CPU usage (e.g. 57%) on Linux

I am wondering how you can get the system CPU usage and present it in percent using bash, for example. Sample output: 57% In case there is more than one core, it would be nice if an average ...
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How to calculate CPU utilization for an application in a multicore system

On 8-core server, 0-3 are configured as isolcpus and remaining cores (4-7) are available for system and user processes to run. My application has multiple processes which will run on any one of the ...
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How to find the number of jobs (created by gnu parallel) running in each CPU core at any given time?

I'm using gnu parallel that reads a text file containing curl commands. If I do ps -ef | grep -cw [c]url it shows total number of curl process at a moment. But I want to know number of gnu parallel ...
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Can't modify Turbo Ratio Limits

After installing msrtools, booting kernel with msr.allow_writes=on, loading the module using modprobe msr and setting MSR_PLATFORM_INFO (0x0ce) bit 28 to 1 I cannot modify MSR_TURBO_RATIO_LIMIT (0x1ad)...
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Interpreting variations in LOCal timer interrupts number

Running a given workload in different CPU isolation (IRQs & processes) configurations, I do not observe significant differences among values (grand total) reported in /proc/interrupts & /proc/...
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What PSI cpu full means?

I've found two articles about PSI, and both of them say that cpu has only "some" metric. atop shows only "cpu some" too. But my system has "cpu full" metric: $ cat /proc/...
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ftrace cpu_idle state 0 and -1

I have read in here that when using ftrace and we get a cpu_idle line like: <idle>-0 (-----) [000] .n.1 4536.120761: cpu_idle: state=4294967295 cpu_id=0 this means that the CPU goes back ...
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How to Choose Between Real-Time, Low-Latency and Normal Kernels on Startup?

For instance, I know it's possible to easily install several desktop interfaces and choose what session to log into on startup. Is this type of thing possible for choosing between kernels? I would ...
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CPU LOAD AVRG + how to deal process with D state

we can see from our RHEL 7.6 server ( kernel version - 3.10.0-957.el7.x86_64 ) that following process are with D state ( they runs from HDFS user ) Note - D state code means that process is in ...
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CPU usage never 100%

I'm encoding video in 6 instances of Handbrake, but CPU usage is never above 85%. Why is this/how do I diagnose the issue?
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CPUTSET - Erro the create CPU isolate failed to create shield, hint: do other cpusets exist

i'm try using cpuset version 1.6. But I was try init shield show this error: "failed to create shield, hint: do other cpusets exist?" I'm was Investigate in code, found this section where ...
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why docker container consume huge CPU load average

I want to discuss about strange behavior on our rhel 7.6 server We installed Kafka exporter with container on the server – kafka-01 machine ( total CPU on machine are 12 ) The following yml file ...
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Get memory/cpu usage by application

What I need I want to monitor system resources (namely memory and cpu usage) by application - not just by process. Just as the Windows Task Manager is grouping resources by the "calling mother ...
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Why does my Laptop CPU throttles itself until I pull and reinsert Power Cable?

my Laptop (HP Envy x360) with an AMD Ryzen 5 2500U is at a stable ~2,4 GHz when under load but after some time it always drops to 1,2 GHz and won't go up even though plugged in, 100% Battery charge ...
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A process is running and I cannot find what is it and cannot kill that!

I've found a bash process in my Ubuntu server that is consuming all of my CPU I've try to kill this process by kill -9 and after kill the process run automatically How can find what is this process ...
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High CPU usage of postgresql

I have a PostgreSQL backed complex Ruby on Rails application running on a Ubuntu Virtual Machine. I see that the Postgres processes were having very high CPU usage while running top command. ...
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Do CPUs that support 5-Level Papging implement a 57-bit long address bus? [closed]

Despite having a data bus size of 64 bit, the address bus size of modern AMD64-compatible CPUs is/was 48 bit for some time which allows using 48-bit long virtual memory addresses with a maximum of ...
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kworker hogging CPU after getting additional SSD - high acpi interrupts on gpe11, masking or disabling causes system freeze

Mine is a 7 year old Dell Inspiron 3542 (Intel i5), have been running Linux for about 5 years now. Recently I got an additional SSD fitted in the HDD slot and moved the HDD into the place of DVD Drive ...
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How to manually calculate CPU load?

The CPU utilization and CPU load are actually different. I was able to calculate the CPU utilization by taking stime + utime for my process /proc/[PID]/stat and dividing with the stime + utime of the ...
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Copy file from server to two target disks

After I rescue some disk, I copy the result (disk image of several TBs ) from local network data storage (LNDS) to target disk as a file. Usualy the filesystem of the target disk is NTFS. The LNDS is ...
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CPU speeds on linux

I am a new Linux user and have just recently installed Mint. In my bios I have my cpu set to a constant speed of 4.1 GHZ. In windows it shows as 4.1 GHZ but in Linux it shows up as just 3600 GHZ. I ...
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Watchdog message about CPU soft lockup in Fedora

I am running Fedora 34 KDE on my ASUS ZenBook Flip 14 with an Intel 11th Gen i7. It seems like every few minutes, I get this error message: watchdog: BUG: soft lockup - CPU#7 stuck for 22s! [swapper/7:...
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cpuAffinity and isolcpus

I want to use two of my four processor cores for a custom program. I use isolcpus=1,2 in /boot/cmdlineto isolate cores 1 and 2 and run my program with taskset 0x6 chrt -f 1 <program>. I also ...
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Ryzen 3000/5000 CPU Lockup on ASRock X470D4U

Ahoy ahoy friends. Currently i am running my system, using an ASRock Rack X470D4U motherboard and Ryzen 2700X CPU. I use Debian 11 with 5.10 Kernel and KVM + Libvirt in order to run my 30 VM Guests. ...
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How to check Processor Generation?

I was trying to exchange my laptop in an online site and i need to provide them my processor generation. They have shown how to check that in windows machine but i'm using a linux machine. How to ...
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Linux Mint showing 1 thread per core in a 4 thread/core cpu

I have a Ryzen 3 3200g and, when I do lscpu in a Linux Mint 20.1 Cinnamon OS terminal, the output says that I only have 1 thread per core. The Windows system's info accurately recognizes that my CPU ...
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How to get sensors-detect to detect an AMD Phenom II temtperature sensor

Yes, I know that is an old chip. Running a sensors-detect with all the optional tests yields nothing. My sensors refuse to read the temperature of the CPU. I know there is a working temperature sensor ...
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CPU fans not working on Dell laptop running Ubuntu

The CPU fans are not working at all on my DELL Inspiron 15R N5110, I am running Ubuntu 20.04.2 Server, and the laptop overheats quickly after a small duration of uptime. I checked the hardware and the ...
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Why would Linux kernel drop the isolcpus parameter?

I'm trying to pass isolcpus=1-4 to the kernel command line, Linux version 5.10.42 LTS. My boot manager is EFISTUB/efibootmgr. I'm booting OK but the parameter is simply not there when checking with $ ...
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Can't increase cpu cores on VBox vm

I imported a virtual machine from another host (the original host is using VirtualBox 5.0.16 and the new host is using VirtualBox 6.1.12). This virtual machine is installed with RHEL 4 32-bit version ...
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Linux-Kernel Config - Symmetric multi-processing support - Does this apply to my CPU?

I'm configuring the Linux kernel and at this point I am not sure what it means. Symmetric multi-processing support This enables support for systems with more than one CPU. If you have a system with ...
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Process I\O vs CPU bound?

I saw this question online preparing for a job interview: Given a Non-Preemptive kernel which type of process will get effected more in terms of performance and why? I\O bound CPU bound I know ...
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How are vcpus distributed in AIX LPARs?

I'm reading some docs about LPAR on AIX/IBM server I have this schema: +---------------+------------------------------------------------------------------------+ |LPARS |Virtual cpus | ...
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Why does my CPU disregard the maximum frequency set by e.g. cpupower and how can I keep my CPU from getting too hot?

I am using Debian 10 (buster), 4.19.0-16-amd64 #1 SMP Debian 4.19.181-1 (2021-03-19) x86_64 GNU/Linux on my Lenovo T530 laptop which has a i7-3630QM. It has been many years since I bothered with ...
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No crit high low returned by sensors - is this normal?

I assembled a brand new Ryzen-based workstation. The temperature sensors returned by sensors seems to be working fine, but those of the CPU do not specify low, crit, and high thresholds. > sensors ...
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Listing CPU Cores For Multiple CPU Packages

I need to get CPU cores and details per CPU core. I use cat /proc/cpuinfo command an it works. But I need to get information for multiple CPU packages. I have only single CPU package. How would the ...
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lm-sensors meaning of output

What does this mean, what is hyst? "hyst = -273.1°C" $ sensors k10temp-pci-00c3 Adapter: PCI adapter Tctl: +45.0°C Tdie: +45.0°C Tccd1: +45.2°C nvme-pci-0100 ...
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