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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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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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What can i measure to estimate performance of non-speculative execution?

Attempting to calculate worst-case long-term hosting cost increase as a multiple of the 2018 total, I ran into an issue that does not appear to be solvable with the canonical advice to "Benchmark your ...
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1answer
31 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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4answers
449 views

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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What is the most important hardware spec with PHP's readfile function? [duplicate]

I have a PHP script that serves files via the readfile() function on an Ubuntu server with PHP5. I would like to speed up the process, but I am not sure which system requirement will help me to ...
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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
662 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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56 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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1answer
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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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3answers
666 views

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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2answers
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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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1answer
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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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2.5 GHz, Intel Skylake P-8175 vs. 3 GHz, Intel Xeon Platinum 8124M for CPU intensive application [duplicate]

I have a fairly CPU intensive Scala app. I am wondering which one of the following two CPUs are better for this app: 2.5 GHz, Intel Skylake P-8175 3 GHz, Intel Xeon Platinum 8124M Both of these ...
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0answers
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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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1answer
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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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NFV-grade server hardware configuration [duplicate]

Interested to know how to spec my servers for high performance networking applications and to perform real-time processing of many packets. (servers to be equipped with 100Gb/s NICs) Currently I'm ...
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0answers
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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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0answers
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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
416 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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cpu idle and steal time together

Given 'top' stats like follows: top - 10:15:30 up 1:04, 2 users, load average: 9.06, 9.63, 8.71 Tasks: 425 total, 19 running, 406 sleeping, 0 stopped, 0 zombie Cpu0 : 57.5%us, 6.7%sy, 0.0%...
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54 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
2k 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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1answer
39 views

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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229 views

Redhat vs Oracle Linux benchmarks

I have two servers, both have Intel 8160 processor, 768 GB memory, same hardware specs, same software/package versions. The only difference being that one is running RedHat Enterprise Linux 7 and the ...
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1answer
158 views

Which CPU is utilized when seraching a server from an end user machine?

When an end user desktop that is connected to a network runs a normal Windows Explorer search of a network location (\\server-name), which CPU is utilized? The CPU on the end user machine, or the CPU ...
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1answer
65 views

Network performance with an i7 6700 Skylake

We're looking into setting up multiple servers with Nginx; the estimated required capacity is 60 Gbps (six-zero gigabit per second) A nearby datacenter offers us servers with "i7-6700 Quad-Core ...
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0answers
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Any difference between “siblings” in /proc/cpuinfo and “threads” in intel official documentations?

/proc/cpuinfo provides such info: ... vendor_id : GenuineIntel cpu family : 6 model : 63 model name : Intel(R) Xeon(R) CPU E5-2630 v3 @ 2.40GHz stepping : 2 microcode : 59 cpu MHz :...
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1answer
61 views

How to view CPU model in red hat vps or cloud

How can I view CPU model in Red Hat VPS or cloud? If I run the command cat /proc/cpuinfo as root it shows qemu virtual cpu version (cpu64-rhel6) How to view model? Like E3-xxxx or v5-xxxx.
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1answer
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VServer shutdown on high cpu load - normal?

I rented a VServer to perform some distributed computation tasks. Unfortunately I had to notice that after some minutes of almost full cpu load my vserver shut down. I also got an email, notifying me,...
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1answer
89 views

What is the most accurate way of measuring cpu utilization of processes in Windows based systems

I have been trying to find out the best way to measure the CPU utilization of processes in a Windows Server 2012R2 system and I found out that there are many inconsistencies among the methods used to ...
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0answers
29 views

DDOS attack on cloudflare attached server

So I have like 4 Digital Ocean droplets and they all are attached to DNS through cloudflare. The problem is they all are being attackers in different times of month by millions of IPs and some of them ...
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1answer
33 views

Does my Z370 HD3P board have the Intel Management Engine?

I recently got a Gigabyte Z370 HD3P motherboard. How can find out if it has the Intel management engine on it or not? One person told me it is on the CPU, but my understanding is that it is a ...
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2answers
545 views

DL360 G6 dual CPU endless boot

I have a HP ProLiant DL360 G6 with a Xeon X5570 and 32GB (2x16GB) 4R RAM, which works just as expected, but whenever I try to add another X5570 to the other socket (making it a dual CPU machine) it ...
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2answers
2k views

how to know if my servers should use huge pages ( memory page size )

we have several servers in cluster , and we want to know what in general in which cases we need to configure huge pages ? I have also few quastions dose "memory page size" is equal to Huge pages ? ...
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1answer
128 views

Intel Scalable Processors

this should be a pretty straight forward question but might come out as ambiguous (might also be the wrong place to ask). I've been researching the newest and bluest Dell Poweredge and HPE server ...
2
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1answer
33 views

Are processors more efficient at lower temperatures

I couldn't find a stackexchange site that's more suited for this question, I apologize. This doesn't necessarily have a lot to do with servers and stability.... I do not have problems with stability ...
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1answer
522 views

Xeon Processor or Corei7 for Mysql as a Database Server? [duplicate]

I have a wordpress database (4GB). I have two servers with the following spec: Processor Cores RAM HDD DBMS 1. Xeon X5650 2.6GHz 6 64GB 250GB SSD Mariadb ...
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2answers
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Strange CPU usage when I touch (or a little shake) [closed]

I've got a setup on a ASUS Z10-PAU8 MB and Xeon 1620 v4 + Corsair RMx 850W + 1 HDD + 1 SSD. We noticed that, with the slightest touch (little shake the table where server temporarily lays) of the ...
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1answer
241 views

Reporting units for user and system CPU usage for individual process via collectd

I've been using the collectd:Process Plugin to monitor the per process metrics on a Linux server I'm running. It is just that there are no information about the units for which process use the CPU ...
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4answers
870 views

How is RAM and CPU allocated if no manual changes are applied to an Ubuntu Server

We have an Ubuntu Server (16.04) running R-Studio Server where we do statistical simulations. Those simulations are sometimes heavy on RAM and CPU so i would like to know how memory and RAM is ...
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1answer
87 views

cpufrequency on Debian 8 (Jessie)

I'm running a database benchmark (TPC-H) and because of this, I need my processor not to have variable-speed. I know there are modes: Powersave Conservative Ondemand Usespace Performance On S.O. Red ...
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2answers
87 views

What gives better performance single proc - 16 core or dual proc - 8 core each? [duplicate]

What gives better performance single proc - 16 core or dual proc - 8 core each? We are considering going for a sing proc server due to increase in license cost. Edit: We plan to use VMWare vsan, It ...
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1answer
7k views

KVM: Which CPU for VM ('host' vs 'kvm64') to use for web load?

Being play with Proxmox 5.0 as a hypervisor platform and set up KVM VM to serve website, I really wonder if I should use kvm64 "virtual" CPU or try to use host. To be specific, I have an 4-core CPU ...
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1answer
314 views

ProLiant DL580 G7 E7 Upgrade Issue version 2

I am responsible for ProLiant DL580 upgrade to four E7-4870 processors. We are running Windows Server 2012 R2. The situation is very similar to what has already been discussed here: ProLiant DL580 G7 ...