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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28 views

Diagnose DB server usage of 100 % [on hold]

I have a web application using MySQL RDBMS and the CPU usage of the DB server goes to 100%. How can I diagnose the root cause for this?
4
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3answers
443 views

How does Linux distribute load on multiple CPU cores

Let's say I got 2 quadcore processors (8x 2,13Ghz). The server runs multiple programs which can only utilize 1 core + Nginx and Apache worker at the same time. The question is, does Linux efficiently ...
4
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4answers
604 views

vCPU performance between 1 or 2 vCPU's

Within virtualisation (Predominantly VMware) is there a performance advantage using either 1 CPU with 4 cores or 2 CPU's with 2 cores? Let's assume the application running on a VM can use two CPU's.
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0answers
27 views

When installing InfluxDB, what is more important CPU or memory? [on hold]

I had to deploy an InfluxDB 0.8.3 setup in Amazon. Just one instance. I needed to figure out what would be better, if a memory or compute optimized instance. In the end I opted for memory, as I ...
0
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1answer
31 views

CPU clarification in vCenter

So i'm running a lab on a Dell PE R410 2 X 4C 2.26Ghz, this evening I saw that vCenter is showing that the processor is @ 2.27Ghz. It's not that big of a deal but was curious as to why there is that ...
0
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0answers
30 views

Dual core CPUs stall with Docker on Ubuntu Linux

I have seen performance degradation after half an hour to one hour with machines running Celery (Django/Python), or Storm under Docker containers with Ubuntu base on Dual-core CPUs on AWS. I see ...
0
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0answers
11 views

Avira Webgate Troubleshooting: High CPU load

we are using Avira Webgate as Virusscanner for squid. We have two Servers running the Avira Webgate and see in both servers the same behaviour: The CPU is nearly always at 100% CPU whicht is fine on ...
0
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0answers
29 views

High CPU Utilization from apache tomcat

In our environment, we have two tomcat servers on a windows environment which are load balanced. Server 1 has normal CPU utilization whereas Server 2 has almost/more than double the CPU utilization of ...
0
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0answers
15 views

Machine Check Exeption

I got a Machine Check Exception error earlier, Does this mean my CPU is corrupt? What is the problem here? I keep getting this error randomly and the system shuts off.
2
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1answer
95 views

CPU error messages shown in console during boot — “CPU1: Stuck ??”

I recently installed a second CPU into a server. The CPU is identical to the first and I verified that the CPU is in good working order prior to the installation. The server booted up and I installed ...
0
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0answers
28 views

How to estimate server load?

I know a time of some cryptographic operation - let's say, for instance, it takes 0.4598s to perform a cryptographic action. I have a Intel Xeon 3.00GHz CPU (multi-core). How can I calculate (I skip ...
0
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1answer
62 views

Strange CPU spikes with MySQL

On my server (ubuntu 12.04) mysqld started to show some strange CPU spikes. I've logged some of it as a sample: http://pastebin.com/4MwKUVwL The value after the triple dash '---' is the cpu usage ...
2
votes
1answer
54 views

Set default numa policy to “interleave” system wide

I know it is possible to set the numa mode to "interleave" (see NB below) for a specific process using numactrl --interleave, but I'd like to know if it is possible to make this the system wide ...
0
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1answer
32 views

Can you put different CPUs in a dual-cpu motherboard?

I have an ASUS KCMA-D8 motherboard with two Socket C32 CPU sockets. Only one is used right now. Can if put a different (better) CPU in the other socket and have the motherboard use both? Or do ...
1
vote
1answer
101 views

difference between taskset and cpuset

I'm trying to reduce the latency of my linux network application. I've learned that there are two tools for "binding" a program to particular CPU core: taskset and cpuset. Which one should I prefer? ...
0
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0answers
37 views

What bus size does the armadaxp CPU with armv7l architecture of a Synology DS214 have?

less /proc/cpuinfo prints Processor : Marvell PJ4Bv7 Processor rev 2 (v7l) processor : 0 BogoMIPS : 1064.96 processor : 1 BogoMIPS : 1064.96 Features : swp ...
0
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0answers
145 views

HIGH CPU usage by PHP on a VPS Magento Server

My server running magento is 4gb ram and 4 core cpu. But still i am struggling with the high CPU usage. I only have 10 visitors at any given point of time. I am not sure if the PHP has to take this ...
0
votes
1answer
22 views

Does enabling more IIS logging fields consume resources?

It seems that IIS7 doesn't enable the bytes sent and bytes received fields in its logs by default. I would like to enable them so I could watch bandwidth consumption of individual sites, but my ...
6
votes
2answers
346 views

ESXi and Windows Server CPU parking

For those that don't know, CPU parking is a feature in recent Windows Server releases that allows Windows to pretty much drop a CPU core to zero use, and having nothing use it. It's been introduced as ...
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votes
1answer
72 views

High load of RAM but low CPU

I've a dedicated problem.. When I make a load test with ~500 connections, CPU stay low (about 30%) but memory grow up fast ! And I have a 100% used RAM and 50% used SWAP.. An other dedicated with 2x ...
0
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2answers
33 views

Windows Server 2012 - Trace CPU Spike / Takeover

I have had a problem in the last few days where every 10-15 minutes, my entire server goes non-responsive, shutting out all TCP connections, for about 3 minutes. I finally found that the connections ...
28
votes
1answer
957 views

Is it possible to influence the way CPUs are enumerated under Linux?

I have a HP DL380 G7 with 2 unequal CPUs in it. One is a quad core CPU with faster cores, and one is a 6 core CPU with slower cores. On this box I run an application that due to licensing reasons ...
0
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4answers
68 views

Proper way of interpreting system load on a 4 core 8 thread processor

As we all know, load of 1.00 on a single processor means that there is a load of 100%. Analogically a 4.00 load on a quad core would be 100%. How should I interpret load on a 4 core 8 thread ...
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0answers
35 views

Efficient way to use maldet scanner

I don't know if this is the right place to ask this question or not. Sorry if this is not the right place. I have installed the maldet (Linux Malware Detect) scanner to scan malware from the server. ...
0
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0answers
45 views

Dell Poweredge R410 does not recognize second CPU

I have a Dell Poweredge R410 with two CPUs installed. I tried everything but the second CPU does not get recognized by the BIOS or the Linux Operating System it has. Both CPUs are Intel Xeon E5602 ...
2
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0answers
60 views

WPF application issues on AMD CPU vs Intel

I'm not sure if I should toss this on SO or not, I don't think its code based, so I'll start here. We are having an issue in the testing of our new product when using on an AMD CPU vs Intel. The app ...
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0answers
111 views

Getting high CPU usage on EC2 running Plesk

I've been running Plesk on an AWS EC2 instance for over a year with no major issues. All of a sudden yesterday I start getting severe CPU spikes / periods which has made my uptime about 16% over ...
1
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1answer
41 views

Historical CPU Utilization by Service Name In RHEL 6.2

I need to implement historical CPU Utilization by service name in Linux Red Hat 6.2. Is there any software or command which can provide such details ?
0
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1answer
14 views

How to interpret system load on a virtual server?

I understand that system load as reported by linux 'top' is the avg number of processes waiting for CPU time and you should thus take the number of CPU cores into account when interpreting the load. ...
0
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1answer
62 views

Why does Apache split up the CPU for www-data processes out of 100 or 200?

It seems like Apache always splits up the CPU usage for www-data processes out of 100 or 200. Why is this? For example, one www-data process = 100% CPU usage: http://i.imgur.com/mfRuOSm.png Four ...
0
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0answers
72 views

Why my amazon m1.small ec2 instance goes 100% everyday at exact time

Not sure what is happening, my instance goes 100% CPU usage two exact times during the day one at 11:33 UTC and another at 3:38 otherwise rest of the day usage is under 10%. I didn't find: 1. Any ...
0
votes
2answers
110 views

Are AMD Opterons more reliable than AMD FX CPUs?

AMD Opteron CPUs are marketed for servers, and FX CPUs for desktops. However, both support ECC, and while only Opterons support registered RAM, the issue is unrelated to reliability. So, what makes ...
0
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2answers
37 views

rhev and number of cpus

I use RHEV-M to manage a cluster which has several RHEV hypervisor nodes. Currently, each node has 2 CPU sockets. My question is can I add to the RHEV cluster another node which has 4 sockets, and ...
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1answer
48 views

Does/can serving larger files (images in this case) necessitate increased CPU load on a linux/apache web server?

We are experiencing quite a high CPU load on our web server right now (I'm just doing some research, I am not actually the website's administrator) One of the most significant changes has been a new ...
0
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0answers
31 views

SNMP OID for CPU model information

I am currently trying to find the oid / way to gather the CPU model name from a server using SNMP. I have tried looking up the specific oid for it however all I could find were ones that related to ...
0
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2answers
89 views

How to choose the right CPU for a web server [duplicate]

How can i choose the right CPU for a site that runs on two servers, a web server (Apache worker MPM) and a database server (MySQL). The website is written in PHP-Mysql, with no PHP caching (as ...
2
votes
1answer
60 views

How important is the CPU when building a CUDA system?

I'm just a clueless sysadmin and we need to put together a couple of machines specifically for users to use CUDA. We're looking at the Dell PowerEdge T620 and jamming four CUDA cards into the sucker. ...
1
vote
1answer
61 views

Limit user to N CPU cores

I want to limit a user on my system to only be able to use one core of my system. After searching, I found this, but I can't figure out how to use it. I would also like to limit the use of that core ...
0
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1answer
177 views

php-fpm use a lot of cpu

I use wordpress on Ubuntu 12.04 with Nginx + php-fpm on my VPS. There are 2 CPU cores + 4096Mb memory. I've moved mysql database to antoher server and set remote access. There are about 300 online ...
2
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2answers
1k views

Ubuntu on VPS becomes unresponsive: BUG: soft lockup - CPU#0 stuck for 22s

We have a VPS running Ubuntu, on Xen. The problem is this, about once a day, for about 20-50 minutes, at a random time, the server becomes completely unresponsive to the outside world. After this ...
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votes
2answers
324 views

Best type of virtualization when CPU has more threads than cores

I have a 4 cores/8 threads Intel Xeon processor. This is something I tried to particularly ask in SolusVM support, however I haven't got a good reply. I even don't know if they are right: they told me ...
0
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0answers
25 views

False flag multibit errors on highest populated DIMM socket on second CPU of Sunfire x2200. Faulty CPU or faulty motherboard?

I'm testing 2GB ECC Registered DIMMs in a Sunfire x2200. Recently the system event log (SEL) began logging Multibit Errors on the highest populated DIMM socket on CPU1. With 8 DIMMs on CPU1, the SEL ...
1
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0answers
62 views

Debian 100% cpu every 30 minutes but not loggable?

I have a Debian 7 x64 machine running with Digital Ocean that has every 30 Minutes a 100% cpu usage for about 1 minute. A couple of days ago it stayed there for a couple of hours so the server finally ...
4
votes
1answer
221 views

Hyper-V cluster with different cpu

i have these three servers with different CPU : First Server : Intel Xeon E5645 2.4Ghz 12M Second server : Intel Xeon X5660 2.8Ghz 12M Third Server : Intel Xeon X5550 2.6Ghz 8M I want to install ...
0
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4answers
973 views

How to explain to users the difference between Xeon and i7/Consumer CPU [closed]

I know that these 2 CPUs, given the same clock speed are still different due to many different factors, but realized I didn't really have enough knowledge to explain it clearly. I assume caching and ...
0
votes
1answer
190 views

What are the performance implications of Hyper-threading for single Nehalem+ CPU? [duplicate]

I am choosing between two models of servers, the major difference between them being the the availability of Hyper-Threading. Servers in question are SYS-E32-1 and SYS-E32-3 from So you Start (an OVH ...
17
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3answers
1k views

“Peaky” CPU Usage on Domain Controllers

We have two Windows Server 2008 SP2 (sadly not 2008 R2) Domain Controllers in a small 150 client domain that are exhibiting very "peaky" CPU usage. The Domain Controllers both exhibit the same ...
0
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2answers
1k views

Ubuntu running Apache Server (Prefork) PHP Fast-CGi High CPU Usage

I have a server running very slowly due to high CPU usage. I think this must be a configuration issue but I can't put my finger on why. The server is running Plesk and I've configured PHP to run as a ...
1
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1answer
148 views

Regular periodic CPU spikes from hyper-v vmms.exe

On a fresh install of Windows Server 2012 R2 in a Hyper-V host role, with four VMs running but idle and nothing going on in any of the VMs or on the host, I get a periodic CPU spike on a regular ...
0
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1answer
78 views

lsof getting ran by root, but not by a user and using high CPU usage

My server is using high CPU usage from lsof, and it appears to be ran randomly and by the root user. I'm finding this out via Newrelic information Is it at all possible to find what is running this ...