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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What is “No Out-of-Band Systems Management” on Dell workstations? [closed]

I know what all of those words mean individually, but I'm asking what Dell means by them. This screenshot is from a desktop: This one is from a laptop: Searching has told me what "Intel ME ...
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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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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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CPU load percentage for individual processors

I am using following WMI query to get the CPU load percent data. Select * from win32_processor and below instance results are captured. Win32_processor WMI query results By above data it’s ...
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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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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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Strange server - creating cpu loading problems

So I brought a server got and ip install centos and deploy my website. I start seeing cpu at 20-100 usage... I just deploy a new site on the server the site currently have no traffic so from where ...
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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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Linux [migration/x] processes hogging CPU time

A customer has recently encountered a strange issue with some of our servers. The systems are running a slightly tweaked Debian 8.1, kernel 3.16. Over the course of several months, the CPU usage ...
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What kind of system should I build on the Google Cloud Platform to run a single python script many times as fast as possible? [duplicate]

I have a python script that generates a video of the Mandelbrot set being "zoomed" into (it also adds music). I want to generate videos at 4k 60fps. My computer is nowhere near powerful enough to ...
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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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Base clock rate of server CPUs lower than desktop CPUs - how come? [closed]

Why is the base block rate of server CPU's lower than the one of desktop CPU's? (when both feature the same number of cores) In other words: When comparing the base clock rate of CPU's of a certain ...
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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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How to find out WHICH CPU is damaged?

On one server we keep getting Error ID 19, Internal Parity Error. We already tried temporary disabling the Meltdown/Spectre fixes to no avail, so we think one of the CPUs is broken. The server has 8 ...
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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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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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690 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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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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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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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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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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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
278 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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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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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
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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
187 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
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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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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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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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Scaling Apache/PHP is as simple as maximizing the number of CPU cores?

I have an Linux/Debian server with Intel i7 CPU with 4 cores and 8 threads. When I run my heavy duty Apache/PHP job it uses 1 thread, and when I run concurrent Apache/PHP jobs they each use their own ...
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CPU temp - Dell vs Intel

I'm troubleshooting a DELL PowerEdge M630 (VRTX). I see CPU temp reaching at least as high as 74C. Dell says it is good until 85C. I looked up the CPU specs on Intel's site, and they say 74C is the ...
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Is it possible to run HP DL580 G5 on just 2 processors and 2PSUs?

So I just acquired a HP DL580 G5 server with the following config : 4X 6 core Xeon 7450 2.4GHz processors 128 GB RAM 6 X 72GB SAS drives 15K I noticed that it requires at least 3 power inputs to ...
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mixing Intel CPU of same FCLGA socket type and scalability?

I have a 4 socket server, calling for FCLGA 2011-3. It was built using four Intel E5-4667v3 (16 cores). If one cpu fails, can it be replaced with one E5-4667v4 (18 cores) and still work with the 3 ...
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What does “Status: Populated, idle” in dmidecode output mean?

I have a dual-xeon HP ProLiant DL160 Gen8 server that I'm in the process of setting up, running CentOS 7, and I noticed in my dmidecode output that the second processor is listed as Populated, idle ...
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How can I predict whether or not memory will bottleneck a CPU

My question is general, though I have a specific example. My question is this: How can I predict whether a powerful CPU will be fully exploited in a scenario with memory that is (relatively) low? My ...
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101 views

Bad performance on better hardware

I have postgresql streaming replication on 2 hosts and I've faced with the problem of different performance compared between two servers. It looks like all sql queries on one host are slower on 70-90% ...
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Samba fails Achilles Level 2 tests

During certain Achilles tests, CPU consumption of Samba rises to 100%. I am doing Achilles tests on a Linux-based server. I have noticed that during certain tests (and UDP port discovery), the ...
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1answer
900 views

Can I compare stress-ng bogo ops/s across different CPUs?

I'm testing out a new server with a Xeon 6130 CPU and trying to compare it to an older box with the E5-2660v4. Here's a test I just ran on each box: On the 6130: # stress-ng --matrix 40 -t 30s --...
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64 views

What should I need to do after a CPU/IGP change in Ubuntu 18.04?

On the next week I'd like to change my cpu from an Intel G3930 to G4600. What should I need to do and why? Can I change without reinstall anything? Linux can handle this automatic? Do I need for ...
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1answer
5k views

ksoftirqd and events process high CPU load

Centos 6.9 (64gb Ram) Running nginx, mariadb, php-fpm, iptables, java The server is having random but frequent bursts of 100% system cpu load on only 1 core, crippling network connections to the ...
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Core ids are not consecutive

I encountered a weird situation on a 28-core Intel Skylake system (kernel: 4.4.0-121-generic #145-Ubuntu SMP, hyperthreading is disabled): cat /proc/cpuinfo |grep "core id" core id : 0 core id ...

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