Instead of physical processor-based licensing, it was decided that core-based is licensing is a more reliable and versatile metric to calculate the computing power irrespective of the fact that. VM totalmhz = 2 vCPUs * 3000 MHz =. and basing it on purely vCPU then 8 would be minimum but would give little room for moving machines around for patching ESXi, covering off high CPU workloads or providing resilience for potential hardware failures, I would recommend a minimum n+1 so 9 hosts. e. ESX server provides vCPUs for VM nodes. Towards 96 vCPUs you will be well into that territory and the. 2. For the vCPUs 2 and 3, is not needed. Select Unlimited to specify no upper limit. The remaining 15 host physical CPU cores and their thread siblings will be used for shared guest vCPU usage, with an 8:1 allocation ratio for those physical processors used for shared guest CPU resources. and basing it on purely vCPU then 8 would be minimum but would give little room for moving machines around for patching ESXi, covering off high CPU workloads or providing resilience for potential hardware failures, I would recommend a minimum n+1 so 9 hosts. With 6. But performance problems can occur much earlier. You have six cores per socket. and basing it on purely vCPU then 8 would be minimum but would give little room for moving machines around for patching ESXi, covering off high CPU workloads or providing resilience for potential hardware failures, I would recommend a minimum n+1 so 9 hosts. For example, a cluster has two hosts, each of which has four CPUs that are 3 GHz each, and one virtual machine that has two virtual CPUs. Without knowing other information like memory network capacity, processor usage etc. 0 BEST PRACTICES GUIDEThe number of vCPU you can have highly depends on the applications you have in your machines. It probably would have been better to use "each" instead of "any". used exceed wall clock time due to Turbo Boost, or can see. a physical CPU is namely corresponding to 1 core (embedded in a CPU socket) a VM machine (or a guest OS) recognizes/handles its CPUs always at a virtual CPU level (a virtual CPU is noted as vCPU below). CPU virtualization adds varying amounts of overhead depending on the percentage of the virtual machine’s workload that can be run on the physical processor as is and the cost of virtualizing the remainder of. For example, if the physical host contains a single 10-core CPU package, do not assigned more than 10 vCPU to the Exchange Server VM. Host > Hardware > CPU and check the value of Cores per socket to determine if your host has more than 32 physical cores per CPU. 7 there is no Socket or Core limit for Hosts. If not known leave as Default. It is recommended 1 vCPU for task users and 2 vCPU for knowledge users. Normally the CPU count would indicate the number of physical processors and the cores with be the number of cores within the processor but this looks backwards. Each physical processor (CPU) in a server needs to have at least one processor license key assigned to be able to run vSphere. For ESXi 7. A virtualization layer is sometimes known as an abstraction layer. So setting a reservation will help improve performance for the VM you set it on, but will not “solve” CPU ready issues caused by “oversized” VMs, or by too high an overcommitment ratio of CPU. 100% represents all CPUs on the host. VMs with more than one vCPU are also called symmetric multiprocessing (SMP) VMs. Inputs: Virtual server / VM specification: Disk - disk capacity allocated to a VM (provisioned storage). CPU can safely be oversubscribed. The physical CPUs are owned and coordinated by the hypervisor and it divides the CPU into these. I know this has been discussed ad nauseam but, I wanted to post this as I am sizing for a new environment. A good rule of thumb is, when sizing your VM, if the CPU utilization in the guest is on average below 20% at all times, reduce the number of vCPUs. The default parameters used by this tool are for illustration purpose only. 6 vCPU. The maximum number of processor cores that can be assigned to a single VM is 768 in vSphere 7. So, for every vCPU, there's a processor thread running for each on the physical CPU. 104 physical CPU cores across the cluster. 04-26-2023 06:36 AM. coresPerSocket larger than. LOGICAL PROCESSOR = Amount of CPU's presented to the ESX Host. 02-18-2015 04:51 AM. You configure how the virtual CPUs are assigned in terms of cores and cores per socket. 0 GHz, then the total clock speed is 2x2x3=12 GHz. At work on ESXi, with Xeon 5600 (hex-core) CPUs, we can run 20-50 VMs per server (all running off large, expensive SANs). Under Virtual Hardware, expand CPU. SOCKET = Physical hole where in one Processor can fit in. For example, if a CPU has 8 cores and 16 threads, the maximum vCPU count is: (8. Per virtual machine licensing. For example, if the physical host contains a single 10-core CPU package, do not assigned more than 10 vCPU to the Exchange Server VM. + (Average RDY Core 3) Because ESXi assign CPU resources to each machine when CPU cores available for all machines' cores, machine has 4 cores, so it has to wait for 4 core of physical cpu. Always ensure that the size of the physical CPU and. There are only 4 execution resources available. This can significantly reduce the effectiveness of DRS. Results! Total Available Cores (minus ESXi, CVM and Security appliance) Maximum VM's per host (based on the specified Vcpu/cpu ratio) The correct value of vCPU/CPU ratio depends on the type of workload, os and specific applications. It is recommended 1 vCPU for task users and 2 vCPU for knowledge users. In general fewer vCPUs = better. I have used a small trick to calculate the impact of sharing CPUs (vCPU to pCPU ratio). For example, 5% of total ready reported in vSphere for an 8 vCPU virtual machine has the average of 0. Check the VM vNUMA configuration. If you got 2 Intel CPUs with 6 cores each and Hyperthreading enabled, you got 12 physical cores, but 24 logical cores. Continuous Availability (CA) allows the cluster nodes to be stretched across two fault domains, with the ability to experience up to one fault domain failure and to recover without causing cluster downtime. Browse to the host in the vSphere Client. 1 Physical and Virtual CPUs VMware uses the terms virtual CPU (vCPU) and physical CPU (pCPU) to distinguish between the processors within the VM and the underlying physical processor cores. VM totalmhz = 2 vCPUs * 3000 MHz = 6000 MHz. 02-02-2023 02:55 AM. That is one physical core for every ten virtual. We have a 2500 MHz CPU, with 2 CPUs, each one with 12 cores. For PVUs: Multiply the number of processor cores required to license by the number of PVUs per core required for that processor family. pCPU) The number of logical cores if hyper-threading is enabled on the host: (# of Physical Processors i. Hyper Threading CPU's. For every CPU cycle it always waits until there is a physical core available for each virtual CPU on a VM. 00. It’s calculated by taking the number of processing threads that a chipset offers per core and multiplying the number of occupied sockets: (Threads x Cores) x Physical CPU = Number vCPU. So we will need 200GB of RAM to equal what we have in the physical boxes now. I am often asked by customers, vendors or internal teams to explain CPU capacity planning for large production databases running on VMware vSphere. Generally the more vCPUs per VM, the less options you give to the hypervisor to. The virtual machine monitor (VMM) is responsible for virtualizing the CPUs. Total number of assigned vCPUs to a VM is calculated as:With allocation ratio of 2:1 (2 vCPUs to every pCPU) you can allocate 128 vCPUs, but take in mind to avoid allocate more vCPU to a single virtual machine than it needs, always start small and add new vCPU only when needed. You configure how the virtual CPUs are assigned in terms of cores and cores per socket. In the past we’ve used rules of thumb like 4 vCPU’s to 1 pCPU (4:1) or even as high as 10 vCPU’s to 1 pCPU (10:1) but this was based on an often unspoken assumption – those workloads were basically idle. VMware refers to CPU as pCPU and vCPU. A typical vCPU-to-core ratio for server workloads is about 4:1—four vCPUs allocated for each available physical. . Some operating systems will have a maximum on number of vCPUs. x support a maximum of 64 vCPUs per virtual socket. You can access information about current. Core,Logical CPU,vCPU Explained. Description. vmdk (s) for data and another for logs. For example, a dual-core processor with hyperthreading activated has two. Using a per-core licensing option with a subscription model, you can include multiple cores per CPU (up to 16 physical cores per CPU). For example, my lab has dual-socket ESXi host configurations, and each. The reservation “reserves” CPU resources measured in Mhz, but this has nothing to do with the CPU scheduler. CPU sizing VM/core vCPU/core best practice. Many workstation systems don't have great RAM expansion (many top out at 24GB RAM). Click CPUs. numa. Available CPUs: 12 (logical CPUs) Select logical processor affinity for this virtual machine. Upper limit for this virtual machine’s CPU allocation. Calculating vCPU Number for a Particular Workload. This is very similar to how a mainframe works. NOTE: In this paper we are referencing to a CPU resource assigned to a VM as a “vCPU”, e. So if we configure 8 vCPU for a VM, there must exist at least 8 pCPU in the host. Meeting these defined settings are required to ensure the Gateway VM is not oversubscribing the underlying hardware and causing actions that can destabilize the Gateway service (e. When sizing CPU capacity for the ESXi hosts in the management domain, consider: The requirements for the management workloads. All it can do is migrate those vcpus to another physical core if the load balancer thinks it beneficial to do so, ie- if one core becomes overwhelmed with work and another core is sitting idle, ESX will migrate the vcpu to that idle core. New CPUs (at least in the consumer market) will eventually likely all have the split into performance and efficient cores that Intel has started with the 12000 series. The formula for this is number of CPUs on the ESXi host, multiplied by number of available CPU cycles in GHz. VMware has created a tool to identify the number of per-CPU licenses (supporting up to 32 physical cores per CPU) required for existing. A. The default setting. Use the Number of virtual processor drop-down to lower the vCPU count by 1. The formula is: 1 (processor) * 2 (core) * 2 (threads) = 4; so, I could create a virtual machine with maximum 4 vCPU. You can configure virtual machines with one or more virtual processors, each with its own set of registers and control structures. Calculating vCPU Number for a Particular Workload. 0. The crucial difference in the CPU vs vCPU comparison is a technical one. Press c for the CPU view. For vRAM. This gap makes it especially. Select Unlimited to specify no upper limit. That is, plan a pilot that uses 8 to 10 virtual machines per core. A limit is a max value: if you set a mem limit to 8 GB this is the max memory that guest can use. Testing has shown that Intel HyperThreading, which allows for a single physical core to represent 2 threads to the operating system, provided no noticeable gains in performance and therefore should. When you assign a CPU t a VM in it's settings, this is called a vCPU. Right-click on the virtual machine and click Edit Settings. ESXi will switch the available host threads between all those 112 vCPUs staring the CPU time as fairly as possible. The calculator will then output the. License for each processor license is flexible for up to 32 physical processing cores per CPU. Each vCPU is mapped to a logical processor, which is a physical core on your host system if you. Essential Kits, and vSphere Scale Out. 128 vCPUs/4 vCPUs per VM = 32 VMs. This article provides guidance for reviewing a series of ESX/ESXi host VMkernel and virtual machine failures, and the physical CPUs they are associated with. 1. pCPU) The number of logical cores if hyper-threading is enabled on the host: (# of Physical Processors i. Here, we select Intel Xeon E-2288G as the underlying CPU. Ready (%RDY) - % time a vCPU was ready to be scheduled on a physical processor but couldn’t due to processor contention. 6% of the total with one VM getting 66. If the physical server instead had 20 total physical cores, it could host 10 of these VMs (assuming memory, network and storage hardware are also sufficient using the. If not known leave as Default. Edit: you can multiply the # of vCPU with the ratio you want to overcommit a CPU. This could be comprised of vSockets as well as vCores. Without overprovisioning, 1 core equals 1 vCPU so the E5-2630L and E5-2640 will give you 8 vCPUs per processor while the E5-2650 will give you 10 vCPUs per processor. If you have one socket and six cores per socket then you have 12 logical processors with hyperthreading. In the past we’ve used rules of thumb like 4 vCPU’s to 1 pCPU (4:1) or even as high as 10 vCPU’s to 1 pCPU (10:1) but this was based on an often unspoken assumption – those workloads were basically idle. : host with 8 logical cores, has 2 SQL x. I am trying to find some documentation or best practice guides for virtualization with respect to provisioning vCPUs per physical core (of a CPU). machines can be assigned to each CPU, or core, in the host. In the most simplest form, maybe think of it this way. vNUMA on vSpherephysical processor counts. On the rest I agree and there is no discussion otherwise can becomes really co. VMs with more than one vCPU1. Turn off CPU and Memory Hot Add, it's more trouble than it's worth. min . The hypervisor hands off tasks to the CPU and uses its own task manager to balance workload against the physical CPU. Put simply, the vCPU:pCore ratio assumes the N+1 host is not in the cluster which is how I personally size environments, especially for business critical. 2) If you have an allocation pool with 12 GHz CPU allocation and a CPU speed of 1 GHz, the customer can use 12 vCPUs (12 * 1 GHz). CPU Summation. Virtual CPU (vCPU)— Virtualized central processor unit assigned to a VM. The socket or sockets used by a virtual machine are dedicated to that virtual machine i. VMware ESXi will present individual threads as independent vCPUs, so a dual socket 10-core per-socket HT-enabled system will be able to use 40 vCPUs. The maximum CPU limit for a DRS cluster is the sum of numVMCPUs * GHzPerHostCore for. CPU virtualization adds varying amounts of overhead depending on the percentage of the virtual machine’s workload that can be run on the physical processor as is and the cost of virtualizing the remainder of the workload. For the 55xx or newer CPU models, enabling HyperThreading will make a noticable difference. For purposes of this blog post and the way VMware works, a vCPU represents the total amount of CPU resources assigned to a VM. pCPU or ‘physical’ CPU in its simplest terms refers to a physical CPU core i. Without knowing other information like memory network capacity, processor usage etc. 7. This will allow you to diagnose the performance problems of. Amount of usable CPU Cores for Virtual Machines after considering reservations for vSphere High Availability. 8 vCPUs = 8 cores per socket. In reality the vCPU count is determined by the manufacturer - it is the number of processing threads that chipset offers per core. When you assign a CPU t a VM in it's settings, this is called a vCPU. In vSphere, a physical CPU (pCPU)The available CPU resources in the parent resource pool are insufficent for the operation. For VPCs: 1 VPC equals 1 virtual CPU (vCPU); subject to the “lower of” rule above. CPU: VMware Horizon DaaS recommends setting a 10x over commit ratio for CPU. The reservation is expressed in MHz or GHz. preferHT=True – For all VMs to use hyper-threading with NUMA, add the following configuration on the ESXi Host Advance settings: numa. e there are 112 vCPUs allocated. A i7-980X has similar CPU power. This calculation depends upon how many virtual CPUs you need per virtual machine. These virtual processing resources are pulled from the host’s available physical CPUs. Administering CPU Resources in vSphere. A CPU is a piece of computer hardware that is commonly referred to as a “processor”. 2. VM CPU RDY=(Average RDY Core 1) + (Average RDY Core 2) +. Your example would give you 6 cores to work with. The maximum CPU count depends on various factors, including the version of VMware Workstation, the host system’s hardware capabilities, and the selected CPU. It is possible to overcommit compute resources, you could potentially have VMs running on a host that between them have more virtual processor cores than you physically have available. Are we saying: 1) 0-50msec ( acceptable) 2) Anything between 50msec-1000msec is abnormal, but it should not impact performance. The CPU is the primary element that performs the computer functions. %USED might depend on the frequency with which the CPU core is running. With the parameters established, it's time to start sizing a new environment. In this example, you would need to purchase. , you have 2. Therefore, to get the CPU ready % from the ms value reported by vSphere, use the. 625 % per vCPU. This tool calculates the number of hosts in a vSphere ESXi cluster based on the planned VM workload and host configuration. In other words, if there is not enough pCPU for the VM, it cannot be started. Guaranteed CPU allocation for this virtual machine. 0 Update 1. One vCPU is equal to whatever the frequency of the physical CPU of the host on which the VM is running, regardless of how many cores there are. I3en. CPU use can be monitored through VMware or through the VM’s operating system. Step 1: Determine the total number of vCPUs to allocate to the virtual machine. CPU virtualization emphasizes performance and runs directly on the processor whenever possible. Google: For the n1 series of machine types, a vCPU is implemented as a single hardware hyper. The number of physical cores i. First of all, you need to start with the underlying hardware, CPU and memory. Actual processor speed might be higher or lower depending on host power management. vCPUs run on pCPUs and by default, virtual machines are allocated one vCPU each. Your CPU, if Hyperthreaded, doubles your amount of physical cores. High %RDY and high %CSTP indicate an over-allocation of CPU resources – i. Navigate to a virtual machine in the inventory and click Actions. Sizing the physical environment. For every workload beyond a 1:1 vCPU to pCPU ratio to get processor time, the vSphere hypervisor must invoke processor scheduling to distribute processor time to virtual machines that need it. Browse to the virtual machine in the vSphere Client. As threads execute (vCPUs are used) they are cycled around the physical CPUs. Allocate the minimum number of vCPUs required to meet the workload requirements. Adding this detail for the forum users who might find it helpful. Then we add in the memory we need to run vCenter in a virtual machine (8GB plus 342MB), and also figure 1GB for ESX or ESXi per server. I've been doing some research on vCPU to CPU ratios for a server cluster in a VMware environment. VMs with more than one vCPU are also called symmetric multiprocessing (SMP) VMs. Furthermore, the operator wishes to use 8 host physical CPU cores and their thread siblings for dedicated guest CPU resources. In terms of raw Ghz, each Virtual CPU (vCPU) you assign to a VM is equal to one Physical CPU (pCPU) Core. I think you are over thinking this. CPU usage is the average CPU utilization over all available virtual CPUs in the virtual machine. Determining this ratio will depend on the CPU utilization of the workloads. The number of logical CPUs means the number of physical processor cores or two times that number if hyperthreading is enabled. BTW if your search inside the community, you can find many related topics about CPU Sockets and cores relation, like the following links: pCPU vs vCPU - Relation/Ratio. Otherwise vCD will complain when importing the file that the counters already exist. Solved: I want to get the ratio of vCPU:pCPU, For pCPU, do i need to taking in to account Hyperthread(Logical Processors)? Or just the Physical CPUToday, vCPU count is largely determined by the manufacturer. Performance Specifications. To calculate virtual machine CPUs within the vSphere Client, multiply the number of sockets selected by the number of cores selected. Your Virtual Server includes 24x7 support for the virtual infrastructure, generator-backed power and other benefits of Data Center hosting and operating-system licenses for Windows Server. Core,Logical CPU,vCPU Explained. On the Virtual Server, the same run takes about 30-35 minutes longer to run. This will be discussed further in this series. To start with Physical component. Or if you have many VMs that demand a lot of vCPU, you might only be able to get away with 1. 2. To start with Physical component. followcorespersocket: If set to 1, reverts to the old behavior of virtual NUMA node sizing being tied to. If you have HT off, you should turn it on. This cost does not include optional services like data backups or server. The maximum number of vCPUs per ESXi host is also governed by maximums. A short spike in CPU usage or CPU ready indicates that you are making the best use of the virtual machine resources. For example, if a virtual machine with one virtual CPU is running on a host that has four physical CPUs and the CPU usage is 100%, the virtual machine is using one physical CPU completely. Inputs: Host specification - since the Windows Server 2022 Datacenter and Standard editions are licensed by physical core, this tool requires information about the number of servers/hosts, the number of CPUs per server, and the number of cores per CPU. This issue occurs when CPU reservation set on the virtual machine exceeds the physical CPU core capacity for the available ESXi hosts. This is called "over provisioning", and is a valid technique to use. vSphere attempts to keep the VM within a NUMA node until the vCPU count of that VM exceeds the number of physical cores inside a single CPU socket of that particular host. Number of CPUs. 1. The calculator is designed to be conservative and show information assuming the resources (CPU/RAM) required for the configured availability level are removed from the calculation. CPUs contain cores. If it matters, I am looking at vmWare for the virtualization implementation. In vSphere, administrators assign CPUs to virtual machines in order to support the workload needs of each individual virtual machine. Each logical proc should be treated like any other core. CORE = Logical Processor in physical chipset. Example: You a Quad Core Xeon Processor Socket. g. If а CPU has more than 32 cores, you need additional CPU licenses. Some operating systems will have a maximum on number of vCPUs. A high %RDY time (use 20 percent as the starting point) may indicate the VM is under resource contention. Therefore, to get the CPU ready % from the ms value reported by vSphere, use the formula below: CPU ready % = ( (CPU Ready summation value in ms / number of vCPUs) / (<chart update interval in seconds, default. How VMware CPU Scheduling Works: You have one Physical Hypervisor (ESXI) with one physical CPU, 12 cores and 16 virtual machines. The reservation “reserves” CPU resources measured in Mhz, but this has nothing to do with the CPU scheduler. Example: This table outlines. Press the Windows key + R to open the Run command box, then type msinfo32 and hit Enter. 1. CPU affinity thing in here. You need to license your physical host cores. The vNUMA blog series by Frank. The VMkernel Resource Manager schedules the virtual CPUs. 16 vCPU / 1 vCPU = 16 VM’s. (ESXI Installed). A short spike in CPU usage or CPU ready indicates that you are making the best use of the virtual machine resources. 3 Multiple Point-In-Time Instances 4. Identify your VM by its World ID. Ignore threads, it just the physical cores what matters. Reply. A Hyper-V vCPU is not a 1-to-1 mapping of a physical core. 1) In terms of vCPUs per core I try to gauge the amount of cycles being used by the physical CPU - tools liker VMware's Capacity Planner and PlateSpins Power Recon will measure this -. Determining this ratio will depend on the CPU utilization of the workloads. Procedure to set the number of cores per CPU in a VM: Step 1: Determine the total number of vCPUs to allocate to the virtual machine. VMware uses the terms virtual CPU (vCPU) and physical CPU (pCPU) to distinguish between the. Percentage of physical CPU core cycles used by the resource pool, virtual machine, or world. A physical core is just that: the phsical hardware. Guaranteed CPU allocation for this virtual machine. e. For CPU's it isn't a 1 to 1 ratio for physical to virtual. A vCPU is a virtual CPU that is assigned to a VM. 5GHz of CPU time). The maximum value is equal to the number of cores multiplied by the frequency of the processors. CPU ready is a reliable metric to determine when or if you have truly overprovisioned your pCPU's. The calculator is designed to be conservative and show information assuming the resources (CPU/RAM) required for the configured availability level are removed from the calculation. For example, "0,2-4,7" would indicate processors 0, 2, 3, 4 and 7. 0GHz turbo boost. Note: In this chapter, "Memory" can refer to physical RAM or Persistent Memory. 2x P4500G2 SAN. This hints at the 8 cores behaving more like 24 cores, but now this just. This way, we have the four vCPUs pinned to physical cores and also using them in exclusivity, in the same NUMA. To setup the HAL in Windows, simply go to Device Manager, expand the Computer, and where you see the. Host CPU Considerations. vcpu. In this Dell white paper, the following vCPU:pCPU guidelines are established: • 1:1 to 3:1 is no problem. This threshold cannot be overtaken because Hyper-V is. In order to set up the monitor. However, VMware caution against using hyperthreading in high-CPU consumption scenarios. Configuring Multicore Virtual CPUs. VMware Horizon DaaS recommends you size a host based on the anticipated number of desktops for the near term. . A pCPU with 6 logical processors can support up to 72 vCPUs as long as they are in Windows 7 VMs in a VDI scenario. Microsoft recommends that you maintain a one-to-one ratio of virtual processors to physical CPU cores. pCPU available on a host: (# of Processor Sockets) X (# of Cores) = # of Physical Processors (i. However, VMware have an add-on software module named Virtual SMP (symmetric. Don’t create a VM larger than the total number of physical cores of your host. # of Threads 20 < < < This is number of vCPU you can assign with hyperthreading. A general estimation is that 1 vCPU = 1 Physical CPU Core. Case Studies : Managed. Instead, sizing will typically be based on the anticipated. 1/2. In that case, adding a vCPU to the VM may provide. . As I said the Redhat VM in question is constantly at 90 - 100% cpu (maxing out at 100 quite often). From the Latency Sensitivity drop-down menu, select a setting. Virtual machines can not have more virtual CPUs than the actual number of logical CPUs on. For example, if a host has 128 logical CPUs, you can configure the virtual machine for 128 virtual CPUs. By default, vSphere manages the vCPU configuration and vNUMA topology automatically. 5GHz CPUs in the host, but the guest OS in the VM is consistently requesting to be scheduled for 3. 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. This is documented in Hardware Features Available with Virtual Machine Compatibility Settings under: "Maximum number of cores (virtual CPUs) per socket". 8 Cores x 2 (Hyper Threading) = 16 x 8 = 128 vCPUsAvailable from 9. Just a basic calculator how to size your physical hardware environment based on the amount of requested virtual cores. For example, if you assume 8 virtual machines per core and have a 2-socket 8-core ESXi host, you can host 128. It is recommendable to leave 10% or more room for CPU bursts. The first VM has 6 vCPUs, the second and third each have 4 vCPU's for a total of 14 vCPUs. how many vCPUs are assigned to VMs Vs Cores available - going beyond 3:1 is generally touted as not ideal. coresPerSocket larger than 64 will result in a. I've read several articles & forum postings on physical CPU sockets, cores, vCPUs,. The percentage of time a vCPU in a run queue is waiting for the CPU scheduler to let it run on a physical CPU. 4 vCPUs = 4 cores per socket. VMware multicore virtual CPU support lets you control the number of cores per virtual socket in a virtual machine. One or more vCPUs are assigned to every Virtual Machine (VM) within a cloud environment. Modern CPU's have multiple cores per CPU (physical cores). g. Either way I would see this as 4 vCPU in Azure.