The reason why "wide and flat" is suggested is so that you don't really have to do any research on how many nodes are present on your host, and your other hosts if you use vMotion. You could do this manually, or just save yourself headache by using as many sockets as possible with the least number of cores and let VMWare handle the details for you. Thanks, that's a solid explanation.
I keep hoping I'll have the kind of problem where I'll have to allocate dozens of cpu's to a vm. That means I'd actually have hardware capable of it.
No problem, I haven't gotten to the point where I'm allocating 24 vCPUs to a single VM either, but this is good information to know for the future as computing demands keep increasing. To continue this discussion, please ask a new question.
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Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. However, this is not entirely correct, as the vCPU is made up of time slots across all available physical cores, so in general 1vCPU is actually more powerful than a single core, especially if the physical CPUs have 8 cores.
With an entreprise-grade cloud, if there is not enough CPU resources to go around e. Cookies As part of our commitment to data protection, we've updated our privacy policy. Insights myHyve Login. Hyve Content Manager. If you use CPU overcommitment in the configuration of your VMware virtual machines, keep in mind these values:.
First of all, determine how many logical processors Total number of CPUs of your physical host are needed for a virtual machine for proper work with sufficient performance. Then define how many virtual sockets with processors Number of Sockets in vSphere Client and how many CPU cores Cores per Socket you should set for a VM keeping in mind previous recommendations and limitations. The table below can help you select the needed configuration. If you need to assign more than 8 logical processors for a VM, the logic remains the same.
To calculate the number of logical CPUs in vSphere Client , multiply the number of sockets by the number of cores. In the navigator, open Hosts and Clusters, and select the needed virtual machine that you want to configure. Right-click the VM, and in the context menu, hit Edit Settings to open virtual machine settings.
Click the drop-down menu in the CPU string, and select the total number of needed logical processors for this VM. Cores per Socket. In this string, click the drop-down menu, and select the needed number of cores for each virtual socket processor. CPU Hot Plug. Remember limitations and requirements. This frequency is the maximum frequency for a virtual machine, even if this VM is the only VM running on the ESXi host or cluster with more free processor resources.
The set limit is true for all virtual processors of a VM. If a VM has 2 single-core processors, and the limit is MHz, then both virtual processors work with a total clock speed of one million cycles per second MHz for each core.
This parameter defines the priority of resource consumption by virtual machines Low, Normal, High, Custom on an ESXi host or resource pool. Hardware virtualization. Select this checkbox to enable nested virtualization. This option is useful if you want to run a VM inside a VM for testing or educational purposes.
Performance counters. This feature is used to allow an application installed within the virtual machine to be debugged and optimized after measuring CPU performance. Scheduling Affinity. This option is used to assign a VM to a specific processor. Using this option is deprecated in vSphere 7. On the following screenshot, you see processor configuration for the same Ubuntu VM that was configured before in vSphere Client.
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