Solved

Number of Virtual sockets vs. Number of cores per socket confusion?

Posted on 2014-02-03
5
5,066 Views
Last Modified: 2014-02-19
Hi People,

Suppose I need a compute power of 8x vCPU for my server, which number should I select?


Virtual Sockets: 8
Cores per socket: 1

Or

Virtual Sockets: 1
Cores per socket: 8

Or

Virtual Sockets: 2
Cores per socket: 4

Or

Virtual Sockets: 4
Cores per socket: 2

Which one is good over the other ?
0
Comment
  • 3
5 Comments
 
LVL 119

Assisted Solution

by:Andrew Hancock (VMware vExpert / EE MVE^2)
Andrew Hancock (VMware vExpert / EE MVE^2) earned 375 total points
ID: 39830981
they are ALL the same! (as far as performance is concerned). But sometimes it does depend on NUMA in the server, and using Cores, could result in slower performance.

If you have a licensing Restriction to use Cores, use Cores.

otherwise just use sockets!

see here for the benchmarks and explanation.

https://blogs.vmware.com/vsphere/2013/10/does-corespersocket-affect-performance.html
0
 
LVL 13

Assisted Solution

by:Abhilash
Abhilash earned 125 total points
ID: 39830992
The performance really does not change with different configurations.
Check the below link to understand how they usually work and decide for yourself which is the best configuration
http://frankdenneman.nl/2013/09/18/vcpu-configuration-performance-impact-between-virtual-sockets-and-virtual-cores/#comment-20293
0
 
LVL 119

Assisted Solution

by:Andrew Hancock (VMware vExpert / EE MVE^2)
Andrew Hancock (VMware vExpert / EE MVE^2) earned 375 total points
ID: 39831001
I would also query if you really need 8 vCPU for your server.

Which is 8 Cores on the physical processor?

Many VMs require no more than 2 or 4 vCPU.
0
 
LVL 7

Author Comment

by:Senior IT System Engineer
ID: 39831002
Thanks Andrew,

my ESXi host is Xeon E5-2670

CPU sockets: 2
Cores per socket: 8
Logical Processor: 2x8x 2 (HT enabled) = 32

so I guess in this case the maximum vCPU that I can assign without causing NUMA problem for the future Exchange & SQL Server is:

Virtual Sockets: 4
Cores per socket: 8

is that correct ?
0
 
LVL 119

Accepted Solution

by:
Andrew Hancock (VMware vExpert / EE MVE^2) earned 375 total points
ID: 39831009
Just assign virtual sockets.

e.g. 32 virtual sockets.

unless you have a licensing requirement.
0

Featured Post

PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

In this article, I will show you HOW TO: Install VMware Tools for Windows on a VMware Windows virtual machine on a VMware vSphere Hypervisor 6.5 (ESXi 6.5) Host Server, using the VMware Host Client. The virtual machine has Windows Server 2016 instal…
In this article we will learn how to backup a VMware farm using Nakivo Backup & Replication. In this tutorial we will install the software on a Windows 2012 R2 Server.
Teach the user how to edit .vmx files to add advanced configuration options Open vSphere Web Client: Edit Settings for a VM: Choose VM Options -> Advanced: Add Configuration Parameters:
This video shows you how easy it is to boot from ISO images for virtual machines with the ISO images stored on a local datastore on the ESXi host.

789 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question