Questions tagged [central-processing-unit]

The central processing unit (CPU) is the portion of a computer system that carries out the instructions of a computer program, to perform the basic arithmetical, logical, and input/output operations of the system. The CPU plays a role somewhat analogous to the brain in the computer.

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Can CPUs run with constant boosted speed?

My default AWS server CPU speed is 2.5GHz but somehow I did manage to boost it to 3.1GHz. However, when I run watch -n.1 'cat /proc/cpuinfo | grep -i mhz' they are not constantly working with 3.1GHz. ...
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Why are server CPUs so weak and expensive? [closed]

So looking at CPUs with good single core performance. One example would be AMD EPYC 73F3 which is (according to passmark) on par with Ryzen 5950X, but 10 times more expensive and it's rated over x2 ...
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MariaDB High CPU load after Crash

I have a problem with MariaDB 10.3.16. I was trying to convert a rather large table (26GB) from MyISAM to InnoDB and unfortunately the disk space ran out during this process. When it got full, it ...
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Uneven CPU usage with NGINX

On my CentOS 7 server, the load on each core is unequally distributed, as seen in the screenshot: some nginx worker seem to take way more load than other. irqbalanceis enabled, hyperthreading disabled....
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Does configuring BIOS really solve ESXi CPU Contention?

There's alert coming up on our server saying CPU Contention even if we already isolate that VMguest from another high CPU consuming VMguest: Alert Definition Name: Virtual Machine on a host with BIOS ...
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VPS performance apparently low - how can I verify?

I apologize wholeheartedly but this is probably as unspecified as it can get as for a question. I run a linux VPS and...I think it has an important performance problem, but I can't pin point what it ...
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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 can I get my CPU to run at maximum speed by circumventing CPU scaling? [closed]

I am running CentOS 7 (7.9.2009) (kernel 3.10.0-1160.49.1.el7.x86_64) on a rather old laptop (Lenove T61) with a dual core CPU (Intel(R) Core(TM)2 Duo CPU T7300 @ 2.00GHz). The driver for CPU scaling ...
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Hardware errors in either CPU or RAM, what to do?

I have a server that, every now and then reports Hardware Errors to the OS, but otherwise runs without any noticeable issues. Today I found this while walking by the monitor attached to it. Can anyone ...
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Total CPU Utilisation % from SAR on Ubuntu

When I run sar 1 1 to monitor CPU usage, I get the following output: username@my-server:~$ sar 1 1 Linux 5.4.0-84-generic (my-server) 10/18/21 _x86_64_ (80 CPU) 19:50:45 CPU %user ...
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How to calculate the QuickPath Interconnect (QPI) bandwidth?

For Xeon E5-2697 v2, Intel lists: Bus Speed = 8 GT/s # of QPI Links = 2 According to Wikipedia, one must know the QPI frequency and link width to calculate the QPI bandwidth, but these don't seem to ...
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Why does server throw Q Code 19 only when both CPUs installed?

I've got two identical intel CPUs in an Asus board with one stick of ram each. On power up, board immediately throws code 19 ("SB initialize before installed memory"). I've tested each CPU ...
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what are the risks when mixing different DELL servers and how to know supported rhel versions

we are using the following DELL servers and this server is part of the cluster SERVER - R730 we want to add new servers as R740 to our cluster ( R740 is with Intel Xeon Silver 4110 8c Processor) so ...
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Websites getting down every day on VPS Server

I have a VPS server using 4 CPU and 4GB RAM shared across 10 PHP websites of which 2 website(website and set cron jobs) are using sometime more than 6 CPU core of 4 CPU core available. And because of ...
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high CPU usage of MySQL and recommendation from Mysqltunner

we have noticed that our database server is getting so high CPU (more than 90 % used by mysqld process), the output of mysqltunner is shown below, can you help me please, i'm okay about the ...
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Setting CPU frequency to hardware minimum limit - will it harm the hardware?

I'm running on a Intel Celeron N4120. I can easily set the CPU governor for all 4 cores to powersave using: for n in {0..3} do sudo cpufreq-set -g powersave -c $n done Now, using cpufreq-info I ...
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vCPU/pVCPU Calculation

I am trying to calculate the vCPU/pVCPU information in Dell PowerEdge MX740c using the Intel Xeon Gold 6148 Processor (SKU 6148) with Hyperthreading. Does this seems correct? pCPU Calculation (# ...
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Can Intel Turbo Boost frequency for all cores be lower than the base frequency?

The Intel Xeon 6208U CPU is advertised to have a base frequency of 2.9 GHz and Turbo Boost frequency of 3.9 GHz - but that is for one core, which is not very useful (and IMO, highly misleading). I'm ...
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worker_processes value for Nginx/Openresty running on Kubernetes

Based on the documentation here, https://nginx.org/en/docs/ngx_core_module.html#worker_processes The worker_processes is defined as the number of worker processes. The optimal value depends on many ...
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Why one of the cores is running full on (100%) during development? [closed]

I'm developing an app (Python) which uses face recognition and OpenCV libraries. I can see even after the app finished processing one of the cores keeps running full on for another 10 mins or so. ...
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KVM Ubuntu host - Ubuntu guest: high cpu playing youtube videos

Goal is to lower cpu load in an Ubuntu 20.04.2 vm when playing youtube videos. OS is Ubuntu 20.04.2 for host and kvm guests. Cpu is intel i7-3820qm @ 2.70ghz - ivy bridge - 4 cores - 8 threads. Have ...
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Load average explanation for multi-core systems

I'm trying to understand the Load average in my Debian system. I've read some explanations of the displayed values and I came to understand that the number represents how "overloaded" my ...
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CPU frequency in KVM vps

Is it possible to display CPU max and min frequency in a KVM vps using Libvirt on server ? It only shows CPU mhz in vps and not max and min mhz as seen on server in lscpu command output.
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Intel Skylake Gold 6154 CPU genuine or Engineering Sample? Intel Diagnostic tool passes but CPU-Z and HWInfo shows "ES"

I am testing a GPU Compute Server (ASUS ESC8000 G4) with 2 Intel Xeon Gold 6154 CPUs and I ran the newest version of the Intel Diagnostic Tool (IPDT, Version 4.1.4.36.W.MP) and the tool passes all ...
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matching second hand cpus for dual cpu system

I have a need to replace some CPUs in an HP DL360 server (g8 or g9 I believe). FWIW the new CPU will be V1 or V2 E5-26xx CPU's (most likely E5-2697v2 or similar - something that gives the maximum ...
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Dual Intel Xeon E5-2670 (current) vs AMD Ryzen 9 3900 (new box), for combined web/database server

Due to upgrading from Centos 7 to 8 (no in-place upgrade is supported) I need to get a new dedicated server. Naturally, having had the current one a few years, an upgrade would be nice. The question ...
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Does high cpu load make apache reject incoming requests?

I am deploying a laravel app on a RHEL7.x server with apache as the underlyiing web server. Part of the functionality of the application is to accept http POST requests from other servers and save ...
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What is a software prefetcher (processor setting)?

Configuring the CPU(s) of a DELL Server (via iDrac) I have run accross the term software prefetcher. I have an idea that prefetching is to "fetch" in advance data from the memory in to the ...
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Unable to get access IMPI / BIOS / Intel Xeon Gen2 compatibility issue?

I've bought new( not used ) SuperMicro MBD-X11DPI and x2 - Intel Xeon Silver 4210R OEM Micron [MTA72ASS8G72PSZ-2S6E1] 64Gb Samsung [M393A8G40MB2-CTD] 64Gb When I'm booting, 10 different ...
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KVM heavy CPU usage

I have own kvm on my dedicated server. I create five kvms. On one of them I have problem with CPU. Sometimes top looks like that: TOP image ps aux show a one procces which use 100% of all available ...
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1 vote
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Server performance upgrade for 500 users [duplicate]

I have an application(Moodle platform) with 50 users. The actual performances of the server are: RAM is 2 GB Storage is 10 GB CPU is AMD 2.1 GHz with 2 Core The server is hosted in amazon, instance ...
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2 votes
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Replacing HP ML30 G10 Processor

Dears, I currently have the HPE ML30 G10 with Intel® Xeon® E-2124 processor installed in it. I wonder if it is possible to replace the processor with Intel® Xeon® E-2288G or Intel® Xeon® E-2236 ...
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Could an incompatable Xeon processer cause only two of four RAM slots to be used?

Issue With everything installed correctly, only two of my four RAM sticks are being recognized with the BIOS. I checked the QVL for the motherboard, and the Xeon E5-2628L v3 that I am using is not ...
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CPU load for high performance computing

Is there a reasonable/safe level of CPU load in the context of high performance computing? I understand the meaning of load average for servers in general, but do not know what to expect for servers ...
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2 votes
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How can I lower the CPU usage on MySQL queries?

We are running a Wowonder-based social site for a little community and as soon as we hit 100 users online, our site becomes extremely slow due to high CPU usage. The script itself should be fine ...
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SFTP server for 1 to 5 people team : is an i5 Gen2 enough or is an i7 recommended? [duplicate]

For a one-man company which is planning to hire a small staff, I'm considering transforming a former small form factor desktop into a server to deliver files through SFTP. As a basis for evaluation, ...
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Intel Xeon E5-2630L Vs E-2124

I have a dedicated web server with a web hosting company and am looking to move to a cheaper (saving about 35%) offering, but am concerned about possible performance issues. It's running FreeBSD/...
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High MySQL CPU usage and low RAM usage

I have the following specs: 8vCPUS / 32 GB Memory / 160 GB Disk hosted on Digital Ocean The web application is built upon Laravel (PHP) and is is currently serving 550 concurrent users at this time. ...
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4 votes
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How can I tell the maximum threads my server can run?

Here is the machine spec: CPU(s): 20 Thread(s) per core: 1 Core(s) per socket: 10 Socket(s): 2 Based on what I've read so far, these numbers mean that I can run 20 ...
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Consecutive CPU numbering on multi-socket NUMA Linux system

I've noticed that CPUs are numbered by Linux according to quite different schemes on different multi-socket NUMA systems. I mean the CPU numbers you use in kernel parameters such as isolcpus= or when ...
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How to identify CPU(s) on Linux EC2 instance?

I'm running a Linux c5d.9xlarge instance and wondering what CPU it's using. Amazon's Instance Types webpage states: C5 and C5d 12xlarge, 24xlarge, and metal instances have the following specs: ...
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Number of virtual cores + how to know the right value

from lscpu we get the following lscpu Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian CPU(s): 48 On-line CPU(s) list: 0-47 ...
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What's the difference between desktop processor and server processor?

We are thinking in to buy a new server but around here the server motherboards are not easy to get so we are thinking in to buy a mother for an AMD Ryzen Threadripper 3960X and a mother for it but ...
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Significantly downgrading a server processor in light of extremely idle CPU?

I'm considering migrating my database to a new server. The new server has a much less performant CPU, but more RAM and a faster SSD. Also, it is half the monthly price. Based on available CPU ...
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php-fpm and CPU Overutilization on ubuntu 16.04

I've got configured apache2 and php7.2-fpm. Machine has 32 vCPUs and 192G ram. FPM is set to static mode with 1200 pm.max_children. When 400 fpm process are started the platform is slow and load ...
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Limit processes resources usage with (PowerShell) script

(Sorry for duplicate of https://stackoverflow.com/questions/57704486/limit-processes-resources-usage-with-powershell-script) I'm setting up a shared computer (up to 50 concurrent users) and I'd like ...
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2 x Intel Xeon 5645 vs 1 x Intel Core i7 3.9Ghz: what is a fundamental difference?

I would like to understand a fundamental difference between the two following setups: 2 x Intel Xeon 5645 6x2.40 GHz + DDR3 memory 1 x Intel Core i7 4x3.9Ghz + DDR3 memory I am running a LAMP stack ...
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Is there a way to find CPU power use specifically?

I have a few nodes running CentOS 7.6. With DCMI and ipmitool, I can obtain the power use of the entire node. Is there any way to determine how much power is being used by a CPU alone, preferably ...
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4 votes
1 answer
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Wrong number of cpu cores for Xeon X5650 in Xcp-Ng

--- UPDATE 2 --- Never solved for Xcp-Ng 7.6. Issue does not exist with xcp-ng 8.0. I have a Intel Xeon X5650 processor (from eBay) but linux (Xcp-ng 7.6) only lists 8 using lscpu. However dmidecode ...
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What is the relation between IO wait utilisation and load average

Load average uses processes that are running or runnable or in uninterrupted sleep state. So do the processes in uninterrupted sleep state correspond with the %wa as per the top command? Both are ...
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