VM with 20GB of memory with 8cores?

Alex
Alex used Ask the Experts™
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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
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Ben Personick (Previously QCubed)Lead SaaS Infrastructure Engineer

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.
AlexSenior Infrastructure Analyst

Author

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

So 48 logical Processors.

Thanks
Alex
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization Consultant
Fellow 2018
Expert of the Year 2017

Commented:
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AlexSenior Infrastructure Analyst

Author

Commented:
2 sockets and 4 cores on each socket have been assigned.
VMware and Virtualization Consultant
Fellow 2018
Expert of the Year 2017
Commented:
don't bother with sockets ANYMORE with 6.5

see above...
AlexSenior Infrastructure Analyst

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
AlexSenior Infrastructure Analyst

Author

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

Commented:
Hey Alex,  Glad to help :)

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