We help IT Professionals succeed at work.

VM with 20GB of memory with 8cores?

Alex
Alex asked
on
8 Comments
1 Solution
76 Views
Last Modified: 2019-03-13
So,

I have a VM on ESXi 6.5 with 20Gb of memory but 8 cores as well. I think that's a bit odd but I'm wondering if it would in fact cause any issues or performance impact. Essentially I figured it'd be something to do with the vNUMA and the pNUMA and how it manages across the two.

I know that 6.5 has improved the vNUMA considerably, so I'm wondering if this is still an issue, if so can you provide any documentation?

Thanks
Alex
Comment
Watch Question

View Solution Only

Ben Personick (Previously QCubed)Lead SaaS Infrastructure Engineer
CERTIFIED EXPERT

Commented:
Numa scheduling a large number of cores on a VM isn't in and of itself an issue.

To determine if there is a problem with a VM of 8 cores requires knowing:

  • A)  The underlying physical hardware's total number of virtual cores.    (Virtual Cores = 1x or 2x the value of Physical cores (1x is Hyper threading is disabled, 2x if HT is enabled)  (physical = total cores across all CPUs on the system)
  • B)  The mix of additional VMs on the system, their number of CPUs, and average load.
AlexA lack of information provides a lack of a decent solution.
CERTIFIED EXPERT

Author

Commented:
It's a 24 core server with 256GB of memory

So 48 logical Processors.

Thanks
Alex
Andrew Hancock (VMware vExpert PRO / EE Fellow)VMware and Virtualization Consultant
CERTIFIED EXPERT
Fellow
Expert of the Year 2017

Commented:
AlexA lack of information provides a lack of a decent solution.
CERTIFIED EXPERT

Author

Commented:
2 sockets and 4 cores on each socket have been assigned.
VMware and Virtualization Consultant
CERTIFIED EXPERT
Fellow
Expert of the Year 2017
Commented:
This problem has been solved!
(Unlock this solution with a 7-day Free Trial)
UNLOCK SOLUTION
AlexA lack of information provides a lack of a decent solution.
CERTIFIED EXPERT

Author

Commented:
Perfect, so stick with solid cores and then this should in fact improve performance going forward.

Excellent, that explains a lot, as for the 20GB of memory, that wouldn't cause any performance issues given the lack of cores and the large quantity of memory as it did before?

Thanks
Alex
AlexA lack of information provides a lack of a decent solution.
CERTIFIED EXPERT

Author

Commented:
Thank you both gentlemen, always a pleasure learning from the pros :-)
Ben Personick (Previously QCubed)Lead SaaS Infrastructure Engineer
CERTIFIED EXPERT

Commented:
Hey Alex,  Glad to help :)

Gain unlimited access to on-demand training courses with an Experts Exchange subscription.

Get Access
Why Experts Exchange?

Experts Exchange always has the answer, or at the least points me in the correct direction! It is like having another employee that is extremely experienced.

Jim Murphy
Programmer at Smart IT Solutions

When asked, what has been your best career decision?

Deciding to stick with EE.

Mohamed Asif
Technical Department Head

Being involved with EE helped me to grow personally and professionally.

Carl Webster
CTP, Sr Infrastructure Consultant
Empower Your Career
Did You Know?

We've partnered with two important charities to provide clean water and computer science education to those who need it most. READ MORE

Ask ANY Question

Connect with Certified Experts to gain insight and support on specific technology challenges including:

  • Troubleshooting
  • Research
  • Professional Opinions