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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11 views

cpufrequency scaling with debian 8.1 and Intel XEON E5-1650 v3

I want my server with debian 8.1 not to use cpu scaling but always run at the highest possible frequency. I have installed cpufrequtils $ dpkg -l | grep cpufreq ii cpufrequtils ...
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10 views

Intel Core i7-950, Supermicro X8STi not using intel_pstate driver

In my server I am using an Intel Core i7-950 on a Supermicro X8STi motherboard. While the processor is working fine it, is not using the special Intel CPU driver called intel_pstate. Even though I set ...
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0answers
8 views

Apache Processes Randomly go to high CPU for 25 minutes on EC2/RHEL/Glassfish4

I have a server that receives large POST (100,000 chars max) requests and passes them back to a Glassfish4 application server using mod_jk. The requests are POST requests with a content-type of ...
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1answer
22 views

What does it mean when a process's cpu utilization seconds does not increase even though the process is clearly running?

On a Ubuntu 12.04 system, I'm running redis. Our monitoring looks at the redis process and grabs cpu utilization out of /proc/pid/stats. Great. For tens of seconds, this number does not increase at ...
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2answers
47 views

Minimum requirements seem to much for a 32 bit application

I am a developer using high level languages like C++ and .NET. One of the external applications I support will be upgraded soon. I have received the following minimum requirements for the upgrade: ...
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0answers
3 views

slurm+drmaa tasks vs cpus

What is the definition of task in slurm and drmaa and how is cpu in relation to that? When I have a progam prog that takes a parameter -n for the number of sub-processes it starts, do I need the ...
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0answers
6 views

What is difference between different cpu.cfs_period_us values? [migrated]

I'm reading kernel[1] docs and confused about the cpu.cfs_period_us in this part: 3. Limit a group to 20% of 1 CPU. With 50ms period, 10ms quota will be equivalent to 20% of 1 CPU. # echo ...
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1answer
16 views

Underclocking/undervolting AMD Opteron Processors to lower TDP rating

How does one safely lower the TDP rating of Opteron CPUs? I am willing to sacrifice some power, but wish to keep stability. Background: I have a TYAN S4985 Motherboard with 4 quad-core Opteron 8380 ...
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1answer
393 views

Do I need a CPU that supports Virtuallization to do Containerization?

I've read that Containerization is cheaper than virtualization; I know that containerization uses less resources than virtualization since there's only one OS involved and no virtualized hardware. ...
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35 views

Mapping uWSGI processes to specific cpu cores

I have 2 sites on my server (debian) with 4 cpu cores. For both of them I use workers=2 and cpu-affinity=1 so workers are mapped to cpu 0 and 1 for both sites like that: spawned uWSGI master process ...
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0answers
16 views

PowerEdge 1950 II fault server freezed

Server is a PowerEdge 1950 II 2x Intel(R) Xeon(R) CPU E5345 @ 2.33GHz 8x DDR2 FB-DIMM - Synchrone 1024 Mo log says: Tue May 26 22:56:04 2015 Multi-bit memory errors detected on a memory ...
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1answer
52 views

Skimp on CPU or skimp on RAM? [duplicate]

I'm upgrading to a dedicated server, and I've decided between two servers, but I don't know which to choose. The differences between the two configurations are: Server 1: Intel Xeon W3520(4 cores/ 8 ...
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0answers
33 views

digitalocean server cpu is 75% all the time

I have a nice server in digital ocean, it's the 1GB ram size. It has installed: php, mysql, nginx, supervisored, beanstalkd as I installed. But the problem is the I see that all the time the cpu is ...
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2answers
136 views

X5690 compatibility + HP DL360 G6

Does anybody know if the X5690 is compatible with the HP Proliant DL 360 G6? I got a pair of X5690s and a DL 360 G6 but i am unable to get any video signal. The fans spin up like crazy and that is ...
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0answers
133 views

IIS Worker Process Thread Count

I've seen this question asked but the answer given was either insufficient or unrelated. I feel like this is a pretty simple question(s). We have a Classic ASP app running on IIS7.5 on a Windows 2k8 ...
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0answers
15 views

Will KVM cpu utilization affect other KVM hosts? [duplicate]

I have got 4 kvm host with a total of 4 cpus cores assigned (on a intel core i7 3ghz). If one kvm host will take high cpu utilization (like 100%) will it affect to the other kvm hosts?
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1answer
167 views

High CPU Usage and hangs randomly with HHVM

I'm using phpbb on Centos 7 with 512mb of ram and 1 core. And I'm having randomly hangs and high cpu usage when I get some url of my clean phpbb installation. This is my server.hdf file: idFile = ...
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1answer
33 views

Multiple Processors and Ram

Currently we have a hosted server that has one multi-core processor. We are looking at purchasing servers and one of the options is to add an additional processor (So there would be TWO multi-core ...
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2answers
86 views

How to run a single-threaded application on multiple processor cores efficiently? [closed]

There is this old application that we are using (called Aldfaer) that only uses a single thread. One of its processes takes about 90 minutes to complete at this moment, and we would like to decrease ...
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4answers
255 views

What is a core, and will purchasing more cores for my VPS speed up page load times?

I recently purchased a premium WordPres plugin called Hide my WP. I planned on using this plugin for my nonprofit organization's website, which is a multisite WordPress installation with an SSL. ...
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3answers
1k views

Why CPU spent time on IO(wa)?

I know wa (in top) measures the CPU time on waiting for I/O. Many articles say that. But I am confused that, based on 2 knowledge points: if a process uses a system call to read disk, the process ...
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0answers
14 views

Is a Beowulf cluster a solution for me? [duplicate]

Background I'm an undergrad working on an scientific experiment. Till now I was pilot testing our one of the program on Ubuntu 12.04 and now I need to deploy it. The PC on which I tested the program ...
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28 views

Systems freezes + Memory issues

I have a Hyper-V 2012 R2 server and increased its RAM to 32GB from 16GB. (for a small business). 1-2 months after the upgrade the system started to freeze seemingly randomly. Whether it was posting ...
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459 views

Practical difference between SPARC vs x86

Recently I've been looking into some SPARC devices and their capabilities. But when I look for the differences between the two, I've seen a lot of people using the Ferrari vs bus metaphor If your ...
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2answers
76 views

Single E5-1600v2 on Dual Socket motherboad

Is it possible to install one E5-1650 v2 on each node on twin 1U, dual socket supermicro 1027TR-TF server? I know that E5-1600 series cannot run in dual socket configuration. The question is that ...
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3answers
208 views

Kernel Processes Periodically Eating CPU During High Load

I run a production web server with 24 cores in which the work is both CPU and I/O intensive, but mostly CPU. My scripts delay execution when total CPU load is ~85% or higher in order to keep the load ...
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1answer
108 views

Incorrect CPU count on HP XL230a Gen9

we have an issue with our HP XL230a Gen9 blades where some of the applications are only seeing half of the CPU. On the task manager we see all 56 cores but application are only seeing half of them. We ...
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0answers
97 views

Turbo boost is on even when CPU utilization is at 0 percent

My new server is behaving strangely, it seems that turbo boost is always on even when there's no utilization. The OS is windows server 2012 r2 and power option is set to balanced with default BIOS ...
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0answers
108 views

MySQL/Percona Server sudden CPU usage spikes

I've got some trouble with Percona Server 5.5: suddenly abnormous MySQL CPU usage caused the system to become unresponsive as it was eating up all CPU with a large number of threads. It's a 24 core ...
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0answers
88 views

OS X Server - httpd processes hogging CPU

I'm using OS X Server (4.0.3) on Yosemite (10.10.2), but noticing that the Apache processes are consuming a lot of the i7 CPU: http://i.imgur.com/pnqJOBY.png Can anybody explain why it's so high ...
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0answers
57 views

Centos 7 cpu frequency below the minimum value

Hyeverybody,I have 2 similar Dell PowerEdge r720 server wih the following configuration: CPU: Intel(R) Xeon(R) CPU E5-2630 v2 @ 2.60GHz RAM: 64GB OS: Centos 7 I have noticed, that the in recent 2 ...
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1answer
121 views

Adding new processor to HyperV server?

I currently have a HyperV Server 2012 R2 running on a motherboard that supports two processors, but currently has only one. It has 64GB of memory. I'd like to now add a second processor, moving half ...
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2answers
54 views

Nature of load on a Microsoft Exchange 2013 server

I was wondering if anyone can offer some guidance on the nature of the load that is generated on a Exchange 2013 server. The background of my question is that I'm currently considering options ...
0
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1answer
51 views

Are there benchmarks that measure code execution with various CPUs? Nodejs server building

I have experience building PCs with gaming in mind. But where do I start when it comes to building a server (running specifically NodeJS programs)? I know the most significant factor would be the ...
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1answer
166 views

Isolating a high-CPU PHP Process

I have a 16 CPU core server that's experiencing consistent load averages of 40-70. After camping on a top command for a number of hours, I've isolated the CPU spikes to a single user. After pressing ...
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1answer
542 views

HP Server ProLiant DL360 Gen9 vs IBM System x3850 X5 ==> Numa Processor group usage

The same C# executable programmed to run on every nodes have those different behavior: HP: Run on one node only (one processorGroup) (any one of the 2). Problem: it suppose to run on every nodes. ...
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67 views

Counterintuitive drop in CPU

I am running a memcached service in a linux container pinned to a specific physical core. As expected the CPU increases when the number of requests increase. The requests are sent from a workload ...
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1answer
47 views

Different server response time for 2 web pages with the same view and template?

I've recently been facing hugely increased server response time for some of my web pages (response time in the range of 10-20 seconds). For example, for the page http://www.edmhunters.com/afrojack/ - ...
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votes
1answer
120 views

Dell R410 and X5690 wont boot

I have an R410 that we opened up to upgrade from 2 x E5520 to 2 x X5690. However after the upgrade network didnt work and we could not even get a monitor output. We tried swapping CPU positions and ...
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1answer
81 views

Server virtual processors and processing units

I am using PowerVM hypervisor with AIX operating system, and having troubles understanding the difference between virtual processors vs processing units. Here is an example: I have got a server with ...
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0answers
179 views

High CPU load because high CPU time for sys

I am using MariaDB galera cluster with two nodes + one node for arbiter. My system has 24 core CPU. I am getting stuck with CPU bound. Sometimes, my system consume CPU time to 1000% and CPU load get ...
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2answers
206 views

Numbering scheme for CPU affinity

In the VMware Infrastructure Client (no vCenter), under the Resources / Advanced CPU section of each VM's Edit Settings dialog, there is an option to alter the Scheduling Affinity of a VM. It sets ...
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1answer
129 views

High IO wait when test disk with dd

My server is using two SATA disk Raid 1. I test disk using dd #!/bin/bash i=0 MAX_LOOP=10 while [ $i -lt $MAX_LOOP ] do dd if=/dev/zero of=/data/output bs=1G count=10 ((i++)) done ...
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1answer
733 views

Hyper-V offline migration between AMD and Intel Processors

I have an existing 3 server hyperv cluster using Dell R715 AMD machines. Now I'm planning out what to do if our server room is damaged in a disaster. The plan is to have a single, fairly powerful, ...
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2answers
379 views

Choosing CPU configuration for small NAS

I am going to build an small 4 disks NAS server with FreeNAS/ZFS. I've read that due to ZFS performance 8GB is the recommended amount of RAM for the solution, but I wonder about the CPU. Currently I ...
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1answer
53 views

What is the effect when I reduce the number of physical CPUs in a Windows Server 2008 machine

I need to reduce (remove 2 CPUs) the number of physical CPUs in one of our servers (4 CPUs to 2 CPUs). Does it have any impact on the Windows Server 2008 operating system? I mean, do we need to ...
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1answer
1k views

High CPU utilisation w3wp.exe - GC issue?

I've inherited a website that uses a lot of session state. We've recently experienced continuous high CPU ~95-100% for prolonged period of times. When debugging using DebugDiag, it shows that there ...
0
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1answer
393 views

Can RHEL5/CentOS5 be run on Intel Haswell-EP (E5-26XX V3) CPUs?

We need to upgrade the hardware on some of our CentOS 5.11 servers. From Redhat's Intel CPUs and Supported RHEL Versions page, I see that the E5-26XX V2 CPUs are supported. However, the E5-26XX V3 ...
18
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2answers
2k views

How are CPU time and CPU usage the same?

In the Wikipedia page for CPU time, it says The CPU time is measured in clock ticks or seconds. Often, it is useful to measure CPU time as a percentage of the CPU's capacity, which is called ...
43
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5answers
16k views

On a dual CPU server, is it normal for one CPU to run hotter than the other?

I have a dual Opteron server running Linux with libvirt to host several VMs. The VMs work fine and the server processes OK, but I notice one CPU always runs about 69C (throttles at 70C) and the other ...