Simulator vcpu vmware numa3/11/2024 Another way to say this is that by default vSphere prefers to use physical cores over hyperthreads. It will first use all the physical cores before using the secondary SMT contexts of Hyper-Threaded processors as its default behavior. In other words, it will try to give every vCPU it’s own physical core with nothing else scheduled on the secondary hyperthread. The gist is that vSphere will spread out a VM’s virtual CPUs across as many physical cores as possible in order provide the best performance to an SMP virtual machine. There have been some great articles written in the past with respect to this advanced setting here and here. vSphere chooses when to schedule on the Hyper-Threading SMT context. The guest operating system sees only physical cores. VSphere present vCPU’s to the guest operating system and does not ever expose when those threads are scheduled onto a Hyper-Threaded SMT context. “PreferHT exposes Hyper-Threading to the guest operating system” – False! As with many advanced settings, it can be helpful or hurtful. I want to re-clarify how and when it should be used. I’ve been involved recently in a couple situations in which the ‘preferHT’ advanced setting has been implemented, but for the wrong reasons.
0 Comments
Leave a Reply.AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |