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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48 views

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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2answers
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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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rhel + how to disable CPU's on my machine

We have physical Linux machine with 16 cpus lscpu Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian CPU(s): 16 We want to disable ...
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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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2answers
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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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1answer
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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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2answers
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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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2answers
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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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2answers
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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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1answer
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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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3answers
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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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3answers
785 views

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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1answer
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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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1answer
463 views

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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1answer
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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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2answers
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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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2answers
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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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811 views

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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1answer
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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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1answer
601 views

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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1answer
2k views

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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1answer
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I have code compiled for Intel i7: how can I know which Xeon processors it could run on?

I have code compiled for Intel i7: how can I know which Xeon processors it could run on? There seems to be no clear way to know. I developed these rules-of-thumb, but am unsure if they suffice. The ...
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1answer
102 views

stresslinux hanging on boot at “NMI watchdog enabled, takes one hw-pmu counter. #3”

I have a Gigabyte GA-z170N-WIFI (32GB memory in two 16GB modules) board that refuses to boot, When booting to real media (I.e. Ubuntu 18 live install CD or it's installed OS on SDD) it freezes at ...
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2answers
311 views

HP DL580 Gen8 - not booting after CPU upgrade

We bought several used DL580 Gen8 recently. One of them (let's call it type A) had four E7-4830v2 installed and the other (let's call it type B) had four E7-4880v2 installed. Everything worked fine ...
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349 views

How to tune linux machine in order to improve CPU load average and CPU utilization

We are working with huge hadoop cluster. We have 736 datanode machines and each node have 16 core X 2 thread. On some machines we saw CPU load average (98-128 for 5 min). After deeply ...
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1answer
559 views

How to properly configure ESX VMs to use hyper threading in a usefull way?

I've a kind of specific question that I was unable to find an answer for in the official documentation of VMware or on some other very useful threads here on this platform, so here it is: I've got a ...
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1answer
562 views

CPU cores not showing or disabled?

I have a few servers with Dual E5-2680 v2 CPUs on Ubuntu 18.04. Each E5-2680 v2 has 10 physical cores or 20 threads. That being said, running "cat /proc/cpuinfo | grep processor | wc -l" should show ...
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How does the vCPU align with the CPU? (VM with more cores than the CPU has)

I have a VM running on vSphere 6.5.which has 24 vCPU's. The server has two physical cpu's (xeon e5-2699 v4) which have 22 cores and hyperthreading is enabled. How exactly are the vcpu's running on ...
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1answer
39 views

If I buy CPUs for my server, do I have to buy a “matching pair”?

Can I purchase two identical CPUs say from different websites? I was told they need to be a "matching pair" but I can't find any evidence to support that. Will I encounter any problems from buying ...
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1answer
29 views

Which is better CPU?

I have two linodes. Both are 4 cores with 8GB RAM. I see different CPUs on both the linodes. I use one for production and one for test. Below is the CPU information I see. Please advise which one ...
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1answer
3k views

Intel Turbo not working in CentOS 7 with Intel Xeon Scalable (and other newer CPUs)

We have a small cluster where I work, that I look after. The nodes run CentOS 7.5. Our older nodes use Xeon E5 v4 CPUs, mostly the E5-2699 v4. With the older nodes, the Intel Turbo Boost works ...
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1answer
315 views

Unexpected CPU Percentage with azure metrics

I'm currently having trouble to explain the following behavior on an azure VM. The VM is a Standard DS4 v2 Promo (8 vcpus, 28 GB memory) with Ubuntu 18.04 freshly installed. I generate some workload ...
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1answer
80 views

Fast CPU v Lots of cores… which is best? [duplicate]

We run an ecommerce platform with many sites and lots of crons continually running etc... Resources (images, js) are primarily delivered via CDN. Our server runs CPU intensive apps such as CXS Watch ...
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1answer
946 views

MYSQL is consuming 100% of CPU usage

Been monitoring WHM > Process Manager for a while now, and a particular process from MYSQL keep eating up CPU Usage playing from 30%-100% from time to time PID : 3618 owner : mysql CPU% : 100.60 ...
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3answers
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Package temperature above threshold, cpu clock throttled

I have 2 HPE Proliant DL360 Gen10 servers that are configured nearly the same. They both run CentOS 7.5. The only differences are that one has newer firmware and kernel, in an attempt to fix this ...

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