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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1answer
23 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 ...
-1
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2answers
47 views

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

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 ...
3
votes
4answers
181 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. ...
15
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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 ...
0
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0answers
19 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 ...
0
votes
0answers
4 views

Strange markings on i7 5820 Haswell CPU [migrated]

Purchased a new i7 5820K from Amazon. I found these markings on the cpu; is this normal for Haswells? I thought maybe it's caused by quality assurance and/or testing from Intel's manufacturing ...
-1
votes
0answers
55 views

Disabled CPU C-States in BIOS doesn't take any effect

Server: IBM System x3550 m3 Performance States: Disabled Power C-States: Disabled C1 Enhanced Mode: Disabled OS: Windows 2012 Power plan: High performance I have already disabled any C-States ...
0
votes
0answers
59 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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vote
2answers
30 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 ...
0
votes
3answers
79 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 ...
1
vote
1answer
52 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 ...
1
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0answers
55 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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votes
0answers
69 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 ...
0
votes
0answers
50 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 ...
0
votes
0answers
42 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 ...
2
votes
1answer
81 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 ...
2
votes
2answers
40 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
votes
1answer
29 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 ...
1
vote
1answer
97 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 ...
0
votes
1answer
321 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. ...
0
votes
0answers
45 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 ...
2
votes
1answer
36 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
61 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 ...
0
votes
1answer
55 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 ...
0
votes
0answers
108 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 ...
1
vote
2answers
128 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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votes
1answer
104 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 ...
5
votes
1answer
501 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, ...
2
votes
2answers
267 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 ...
-1
votes
1answer
47 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 ...
1
vote
1answer
740 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
votes
1answer
273 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 ...
17
votes
2answers
1k 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
votes
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 ...
0
votes
4answers
426 views

How is NUMBER_OF_PROCESSORS env variable generated?

I have a couple of HP BL460Cs that are being tested to determine which processor we want to go with when we start upgrading our equipment, and there's a problem with this environment variable on one ...
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votes
3answers
243 views

Oops in syslog and freeze the server with docker

I've got following exceptions after my server freezes and reboot for 2 times I cannot tell the relevant with docker, but it happends every time I started some containers and I cannot find any useful ...
0
votes
1answer
174 views

Can I perform an IPMI bios update without a supported CPU?

I'm considering to build a server using the Supermicro X10SLL-F board with a Xeon E3-1231 v3 CPU. However, according to my research, this CPU requires a BIOS update (unfortunately Supermicro does not ...
1
vote
1answer
156 views

Website performance sluggish - High CPU and Disk Usage

Over the past couple of days my website's performance has been very sluggish, with queries taking a lot of time to execute. My CPU usage hit around 100% 4 times this week. Here is the output of top at ...
0
votes
1answer
99 views

PostgreSQL queries slower than before?

I am using PostgreSQL 9.3 server on my production server. Everything had been working fine for the past couple of months. But since the past week or so, PostgreSQL seems to have becomes very slow with ...
0
votes
0answers
98 views

Increased CPU usage and server response time

Over the past 10 days, I'm suddenly experiencing increased CPU usage on my website with CPU usage reaching 100% three times. During that time I'm unable to SSH to my website so I haven't been able to ...
2
votes
2answers
343 views

Sudden increase in CPU usage and server response time

Over the past 10 days, I'm suddenly experiencing increased CPU usage on my website with CPU usage reaching 100% three times. During that time I'm unable to SSH to my website so I haven't been able to ...
2
votes
1answer
187 views

Can I safely mix RAM (ECC) sizes in a server board?

I have a server (actually used as workstation) with a Supermicro X8DA6 motherboard, with 2 installed Intel X5650 processors. It uses ECC RAM. It currently has 6 Kingston KVR1333D3D8R9S/4GHB dimms ...
7
votes
2answers
378 views

Getting Cisco UCS Server's CPU Serial Numbers

I have a Cisco UCS C240 M3S server with dual CPU failure under warranty. I am trying to find both CPU serial numbers to complete the RMA request, however cannot find any serial numbers. I have tried ...
1
vote
0answers
379 views

Amazon EC2 T2 Small Instance CPU Usage Exceeding Limits

I am running WHM/Cpanel on an CentOS6.5 AMI on a Amazon EC2 T2.micro Instance. T2 instance baseline performance and ability to burst are governed by CPU Credits. Each T2 instance receives CPU Credits ...
0
votes
3answers
585 views

Desktop CPU VS server CPU performance - is passmark relevant?

I am replacing my SOHO server (desktop-grade components) with a used server. A quad-core i5 is being replaced with dual quad-core Xeons X5355, here are the details: i5-2300, passmark score 5276: ...
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votes
1answer
67 views

Amazon G2 not giving a much better computing performance than my laptop CPU [closed]

I have a Java console application that performs Reed-Solomon error correction on large volumes of data (~700 MB at a time), just to test performance. The application is multithreaded, I can see it ...
0
votes
1answer
62 views

Do blocking input ports increases security?

1-Do blocking unused input ports in firewall increases system security? How? (as there is no daemon listening on those ports anyway) 2-Do dropping those unused ports will positively or negatively ...
0
votes
1answer
71 views

intel 2620 and 2609 on debian cpuinfo [closed]

I have two Boxes running Debian 7 with the following processors. Each Box has two of the same processors. Intel® Xeon® Processor E5-2620 (15M Cache, 2.00 GHz, 7.20 GT/s Intel® QPI) # of Cores 6 # ...
4
votes
3answers
816 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 ...