Monitor CPU Utilization by the VM to determine if additional vCPUs are required or if too many have been allocated. In order to set up the monitor. Also, it is important to mention that there is a limitation in the assignation of vCPU which is related to the license of the vSphere you are using. So far, 1:1 is ideal, but defeats the purpose of virtualization. 4. Without knowing other information like memory network capacity, processor usage etc. Right-click on the virtual machine and click Edit Settings. 4. 5 Virtual Center 2. any cores limitation for the free ESXI server? 11-20-2021 03:04 AM. With the parameters established, it's time to start sizing a new environment. Subscription based licensing. In other words, if there is not enough pCPU for the VM, it cannot be started. VMware uses the terms virtual CPU (vCPU) and physical CPU (pCPU) to distinguish between the. The physical CPUs are owned and coordinated by the hypervisor and it divides the CPU into these. vmdk (s) for data and another for logs. For example, if a four-CPU host is running a virtual machine with two CPUs, and the usage is 50%, the host is using two CPUs completely. If your pCPU is 3. 7. The rule of thumb for Fusion is that any individual VM should have no more than N-1 physical cores assigned. pCPU or ‘physical’ CPU in its simplest terms refers to a physical CPU core i. 1. for example: you know that your cpu load is very low then you. That was accomplished giving half of CPU cycles to each logical CPU. The better way is to talk with the vendor of each application and get their recommended configuration for the projected workload. The Get Link button generates a URL for this page with all currently entered data and then shortens it using the Bitly service. But performance problems can occur much earlier. 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. Vcpu/Cpu Datacenter Sizing Calculator. Virtual machine see it a 1CPU with 2 cores(i. 0 GHz, then one vCPU assigned to a VM will be up to 2. HI, Since Microsoft moved to per core licensing i. What's worked for me for many moons is the following: Start small, 2 vCPU to start with. 128 vCPUs/4 vCPUs per VM = 32 VMs. Total. 2 Replies. 1. But in vSphere, we still can't upgrade the vCPU to 4, so the only way going around it build more VMs (which costs. CPU can safely be oversubscribed. I know this has been discussed ad nauseam but, I wanted to post this as I am sizing for a new environment. Under the CPU field within the Virtual Hardware tab, select the total number of vCPUs determined in Step 1. The default setting. Procedure. vCPUs run on pCPUs and by default, virtual machines are allocated one vCPU each. Available CPUs: 12 (logical CPUs) Select logical processor affinity for this virtual machine. Powering on a VM with a manually configured value for cpuid. I am trying to understand vCPU concept in VMware. - if you have a request for 4 CPUs then you need. SOCKET = Physical hole where in one Processor can fit in. In a virtual machine, create one (or more) . Description. cpu. You configure how the virtual CPUs are assigned in terms of cores and cores per socket. 8 Cores x 8 = 64 vCPUs. Furthermore, the operator wishes to use 8 host physical CPU cores and their thread siblings for dedicated guest CPU resources. If you have many / most VMs using vCPU lightly, you might be able to do 3:1 or 4:1. If you have a physical CPU with 4 total threads, you can make unlimited VMs with 4 vCPUs each. Actually, there is not direct relationship between physical and vCPUs. A CPU is a physical chip that is installed in a computer. . I am trying to calculate the vCPU/pVCPU information in Dell PowerEdge MX740c using the Intel Xeon Gold 6148 Processor (SKU 6148) 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. 6% of the total with one VM getting 66. pCPU available on a host: (# of Processor Sockets) X (# of Cores) = # of Physical Processors (i. A short spike in CPU usage or CPU ready indicates that you are making the best use of the virtual machine resources. The minimum size of a SAP HANA virtual machine on Red Hat KVM is 8 physical cores and 128GB. This could be comprised of vSockets as well as vCores. Click Edit Settings. By default, vSphere manages the vCPU configuration and vNUMA topology automatically. 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. 5:1 or 2:1. You can determine the correct number of PVUs per core by referring to the PVU table. You have six cores per socket. 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. There is no common ratio and in fact, this line of thinking will cause you operational pain. NOTE: At the time of writing, the CPU limit per VM on VMware Cloud on AWS is 36 CPUs on i3 and 96 CPUs on i3en instances based on the server hardware capabilities. What hyperthreading does is present each core as two logical cores to your system. For the best performance, when you use manual affinity settings, VMware recommends that you include at least one additional physical CPU in the affinity setting to allow at least one of the. So, for every vCPU, there's a processor thread running for each on the physical CPU. The formula is: 1 (processor) * 2 (core) * 2 (threads) = 4; so, I could create a virtual machine with maximum 4 vCPU. Resolution. With a VM you assign the number of vCPU you want that machine to have, and then pin THOSE CPU to a specific Core on the ESX host. %USEDExpert. If performance is impacted, consider taking the following actions. I am trying to understand vCPU concept in VMware. Modern CPU's have multiple cores per CPU (physical cores). Hi. 9 . 1 Solution schepp Leadership 07-20-2012 03:31 AM Hi. 5GHz of CPU time). VMware refers to CPU as pCPU and vCPU. Mark. Each of those cores has hyper threading and can appear as two virtual cores. The rule of thumb when allocating CPU’s to a Virtual Machine (Best Practice) is to allocate 1 vCPU and then test the CPU utilization. When you assign a CPU t a VM in it's settings, this is called a vCPU. Microsoft provides guidelines to calculate the required compute resources for a single instance of Exchange Server (as an application) so that. If you have one socket and six cores per socket then you have 12 logical processors with hyperthreading. For ESXi 7. • An 8 vCPU virtual machine achieved 86 percent of physical machine performance. e. 5 as well. 6 Determining Host CPU and Memory Requirements. CPU affinity is the same as pinning a process in Windows. Limit Places a limit on the consumption of CPU time for a virtual machine. Therefore, if the vSphere administrator has created a 5:1 vCPU to pCPU ratio, each processor is supporting five vCPUs. 6 vCPU. Virtual server / VM specification: vCPU: RAM (GB): # of. In general fewer vCPUs = better. CPU ready is a reliable metric to determine when or if you have truly overprovisioned your pCPU's. 00. These virtual processing resources are pulled from the host’s available physical CPUs. High %RDY and high %CSTP indicate an over-allocation of CPU resources – i. Q1 Please clarify if following understanding of mine is correct or not: a physical CPU is namely corresponding to 1 core (embedded in a CPU socket) a VM. 8 vCPUs = 8 cores per socket. A limit is a max value: if you set a mem limit to 8 GB this is the max memory that guest can use. Answers. Sizing the physical environment. ok thanks for your replies so far. Allocate the minimum number of vCPUs required to meet the workload requirements. The Physical version had 2 quad core CPUs (running at 1. Virtual socket —Represents a virtualized physical CPU and can be configured with one or more virtual cores. 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. Using multicore virtual CPUs can be useful when you run operating systems or applications that can take advantage of only a limited number of CPU sockets. 0 Update 1. For most types of platforms, this is considered a good practice. Emulating physical processor topology for virtual machines is critical for both execution and. In regards to Benchmarking maybe the below blog MAY be able to help you find an appropriate benchmark test to run from the two suites listed. Consider NUMA and ideally size VMs to. 3 physical CPU. The maximum value of the CPU slider is the cluster's total CPU capacity. e. We generally use the calculation of 8 vCPU's per logical processor (on Hyper-V. CPUs contain cores. This value is expressed in MHz or GHz. A pCPU with 6 logical processors can support up to 48 vCPUs in a non-Windows 7 VDI scenario, e. Subscription capacity = number of cores required per CPU × number of CPUs per. Multiple vCPU’s, the hypervisor CPU scheduler must wait for physical CPU’s to become available Over allocation could result in poor performance. 160 virtual machines. Example Dual AMD EPYC 7713 (2x8x8 cores with 32MB of L3 per 8 cores). , "Windows Server 2016 is licensed under the Per Core + Client Access License (CAL) model". The crucial difference in the CPU vs vCPU comparison is a technical one. e there are 112 vCPUs allocated. 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. Press the Ctrl + Shift + Esc keys simultaneously to open the Task Manager. Total amount of CPU resources available in the cluster. 4Ghz) and the virtual version now has 2 vCPUs (The ESXI host has. If you are trying to do safe over commit, then the best ratio varies depending on how much CPU service your VMs actually use. ESXi supports virtual machines with up to 128 virtual CPUs. Each vCPU is mapped to a logical processor, which is a physical core on your host system if you. You should consider pCPUs (including Cores) only. You're likely hitting CPU Ready alerts due to the one 16 vCPU VM being so dissimilar to the others that are hosted there. pCPU or ‘physical’ CPU in its simplest terms refers to a physical CPU core i. Select a VM, and go to the performance charts and go to advanced. 3% of the total CPU power of host. The underlying physical resources are used whenever possible and the virtualization layer runs instructions only as needed to make virtual machines operate as if they were running directly on a physical machine. CPU overcommitment be less than 2:1, and ideally 1:1 for hosts servicing Exchange workloads. Ghz per Core 4. 2 Replies. Thus, this would cause a great deal of CPU Ready because the VM would be ready to consume CPU time on 8 cores but only 4 are actually available. This value indicates that virtual machines may run on any host in the cluster and that you are abstracting the resources at a cluster level rather than a single physical host level. This VM runs a CPU-intensive application, and the faster the CPU - the quicker the data can be processed. What you might not have thought about is that the guest operating systems. Use the Number of virtual processor drop-down to lower the vCPU count by 1. x Continuous Availability. To manage vCPU allocation in VMware, you should consider the following best practices: Use a balanced approach: Avoid overallocating or underallocating vCPUs. This cost does not include optional services like data backups or server. For PVUs: Multiply the number of processor cores required to license by the number of PVUs per core required for that processor family. 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. That's simple: if you have 32 parallel threads running, but only 20 cores, each thread gets only 62. Use '-' for ranges and ',' to separate values. However, VMware have an add-on software module named Virtual SMP (symmetric multi-processing) that. : host with 8 logical cores, has 2. Browse to the host in the vSphere Client. Each vSphere license has a certain capacity that you can use to license multiple physical CPUs on ESXi hosts. In vSphere, a physical CPU (pCPU)The VMkernel Resource Manager schedules the virtual CPUs on physical CPUs, thereby managing the virtual machine’s access to physical CPU resources. Inputs: Host specification - since many software licensing schemes are linked to server CPU specification, this tool requires information about the number of servers/hosts, the number of CPUs per server, and the number of cores per CPU. Administering CPU Resources in vSphere. For example, if a host has 128 logical CPUs, you can configure the virtual machine for 128 virtual CPUs. This is documented in Hardware Features Available with Virtual Machine Compatibility Settings under: "Maximum number of cores (virtual CPUs) per socket". PROCESSOR = CPU. 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 -. Each per-processor license will cover CPUs with up to 32 physical cores. Upper limit for this virtual machine’s CPU allocation. 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. (threads x cores) x physical CPU = actual vCPU. To calculate the number of vCPUs required for a particular workload, first determine the number of physical CPU cores available on the host. used exceed wall clock time due to Turbo Boost, or can see. This edition covers VMware virtualized SAP HANA systems running with vSphere 7. CPU use can be monitored through VMware or through the VM’s operating system. Also to upgrade the SAN with one more P4500 SAN tray. A general estimation is that 1 vCPU =. In general, 1 vCPU is not equal to 1 CPU. I think you are over thinking this. As for a virtual CPU (vCPU) this refers to a virtual machine’s virtual processor and can be thought of in the same vein as the CPU in a traditional physical server. To resolve this issue: Calculate the maximum reservation value. OK maybe "spreading CPU cycles accross multiple physical CPU's" isnt the correct phrase. A safe ratio is ~4:1 ratio (vCPU:pCPU). 1. 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). If you looked at ESXTOP, you would most likely notice that each HT was at 50% UTIL, and each PCPU (physical core) would be at 100% UTIL. 0GHz CPU's, the vCPU would only ever be able to use 3. 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. Considering that 1 vCPU is equal to 1 CPU is an assumption for the sake of simplification, since vCPUs are scheduled on logical CPUs which are hardware execution contexts. For example, "0,2-4,7" would indicate processors 0, 2, 3, 4 and 7. 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. But some workloads – like SQL, for example – usually. a VM with eight CPUs assigned (in any cores per socket configuration) will be referenced as an “eight vCPUs VM”. Determining Host CPU and Memory Requirements. The average virtual machine profile is: 4 vCPU and 4GB to 18GB RAM. Also for increased performance allocate vCPU's in a matching format to the underlying physical CPU's. Adding CPU resources to a running virtual machine with CPU hot add enabled disconnects and reconnects all USB passthrough devices that are connected to that virtual machine. Total number of VMs 7. In terms of how many vCPU can be assigned to a VM, the short answer is all of them but it is likely to cause performance issues. 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. too many vCPU for the job at hand. vcpu. The performance will depend on the type application workloads you have. NOTE: In this paper we are referencing to a CPU resource assigned to a VM as a “vCPU”, e. Two vCPUs will be two cores or sockets, depending on how you configure it inside the guest, and will. / October 18, 2021 / Uncategorised, VMware. vCPU comparative to physical CPU and cores. 11-20-2021 04:45 AM. Turn off CPU and Memory Hot Add, it's more trouble than it's worth. 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. Note: If the ESXi host is of version 7. The general rules are the following: - VMware: The value for Virtual CPU must be 1, 2 or 4. VMware refers to CPU as pCPU and vCPU. If your virtual machine still experiences performance issues, and if its kernel or HAL can handle switching to a single vCPU, lower the vCPU count to 1. You can configure a virtual machine with ESXi 6. The CPU reservation for low latency VM is. If hyperthreading is enabled, each. When you assign a CPU t a VM in it's settings, this is called a vCPU. vCPUs run on pCPUs and by default, virtual machines are allocated one vCPU each. No matter how many vCPUs you assign you are always using all of the host's CPU cores. , you have 2. Press the Windows key + R to open the Run command box, then type msinfo32 and hit Enter. How does VMware handle. Actual processor speed might be higher or lower depending on host power management. The definition can definitely vary, for example AWS defines vCPU as:. A vCPU is a virtual CPU that is assigned to a VM. The percentage of time a vCPU in a run queue is waiting for the CPU scheduler to let it run on a physical CPU. Starting with vSphere 7. So, where it had 0 CPU ready with a pair of vCPUs, even at 80%+ use, you could have a high percentage of CPU ready when going to 4 vCPUs on the same VM, with the use. If you need the full power of a single core for every virtual CPU, then you should avoid over-commitment. Option C: VM vCPU Affinity to bind the Oracle Java VM(s) to a set number of physical core (s) within a physical socket (s) in an ESXi server 2) Establishing an auditing mechanism of documenting Oracle Java VM (s) movements via vMotion events in the above “Compute Enclosure”. What is vCPU ? A vCPU stands for virtual central processing unit. You can calculate the required licenses if you are using a perpetual license with SnS (Support and Subscription). 5% of single-core cpu-time. For example, my lab has dual-socket ESXi host configurations, and each. 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'd suggest decreasing the vCPU count on that VM and reviewing utilization thereafter. I am trying to find some documentation or best practice guides for virtualization with respect to provisioning vCPUs per physical core (of a CPU). Two vCPUs will be two cores or sockets, depending on how you configure it inside the. The core/socket option available at virtual machine level is to satisfy the needs of some. In the most simplest form, maybe think of it this way. This table provides the examples of socket determination based on CPU and Cores per Socket within the vSphere Web Client: The vCPU count is calculated by taking the number of processing threads per core and multiplying it by the number of cores and occupied CPU sockets. For larger deployments: VMware has developed the attached. Perform always a loadtest with third-party tools like Loadgen or LoginVSI to. Non Hyper Threading CPU's. Outputs: Cost items are grouped by type - one-time costs and yearly recurring costs. Host > Hardware > CPU and check the value of Cores per socket to determine if your host has more than 32 physical cores per CPU. Recommendations for CPU sizing: 1. To calculate virtual machine CPUs within the vSphere Client, multiply the number of sockets selected by. Right-click a virtual machine in the inventory and select Edit Settings. 4Ghz CPUs). Each vCPU is seen as a single physical CPU core by the VM’s operating system. This will help with minimizing and maximizing. 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. It is recommendable to leave 10% or more room for CPU bursts. 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. The number of logical CPUs means the number of physical processor cores or two times that number if hyperthreading is enabled. As an informal initial sizing approach, to start, assume that each virtual machine requires 1/8 to 1/10 of a CPU core as the minimum guaranteed compute power. Value, per vCPU. Some operating systems will have a maximum on number of vCPUs. 03-27-2012 05:52 AM. vmkernel runs always on physical core 0. coresPerSocket larger than. Otherwise there is no other "Direct Passthrough" you can do -everything has to undergo ESXi's internal scheduler. That is, plan a pilot that uses 8 to 10 virtual machines per core. To start with Physical component. Here, we select Intel Xeon E-2288G as the underlying CPU. 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. VMware vCenter. CPU Summation. Therefore, to get the CPU ready % from the ms value reported by vSphere, use the. Based on design, VMware ESXi can handle the CPU oversubscription (request of vCPU more than. Some guys recommend 4 VM's to one. To start with Physical component. There are three main licensing models for vSphere: Per CPU licensing that covers one CPU with up to 32 cores. A CPU socket is a physical connector on a computer motherboard that connects to a single physical CPU. pCPU) X (2 cores) = # Virtual Processors (vCPU) Total CPU resources required for virtual machines at peak:A Hyper-V vCPU is not a 1-to-1 mapping of a physical core. I am trying to understand vCPU concept in VMware. Depending on your application workload and performance needs you can easily scale to a higher ration. 1. Adding this detail for the forum users who might find it helpful. First, we need to select a virtual server and CPU. There is no common ratio and in fact, this line of thinking will cause you operational pain. 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. physical processor counts. pCPU) The number of logical cores if hyper-threading is enabled on the host: (# of Physical Processors i. Instead, there is a layer between the OS and the physical layer, called a virtualization layer. 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. What a logical core is depends on your server. ESX server "owns" all physical resources including all cores/cpus. x support a maximum of 64 vCPUs per virtual socket. This also degrades performance of the VM. On the Virtual Hardware tab, expand CPU, and allocate the CPU capacity for the virtual machine. The answer is, Yes and No. CA requires an equal number of nodes in each fault domain. Microsoft provides guidelines to calculate the required compute resources for a single instance of Exchange Server (as an application) so that. multiple vCPU helps some time when you have native multithreading application (SQL, Exchange). 7 or ESXI 7 support. Solution. Hello @Shield07. AWS: Each vCPU is a thread of a CPU core, except for. For example, an Intel Xeon CPU may have 4, 8, etc. A CPU is a piece of computer hardware that is commonly referred to as a “processor”. Don’t turn on vCPU Hot Add unless you’re okay with vNUMA being turned off. Number of vCPU – Number of virtual CPUs per desktop. The old rule of thumb of using 8 as the number of. . As for a virtual CPU (vCPU) this refers to a virtual machine’s virtual processor and can be thought of in the same vein as the CPU in a traditional physical server. 2 vCPUs = 2 cores per socket. Additional hosts can be added to a Tenant, and the hardware on hosts can be upgraded over time. Before you power on the VM, you can set the VM to 1 vCPU, and then you are setup at the hardware level. A very important part of understanding this is that when you configure a vCPU on a VM, that vCPU is actually a Virtual Core, not a virtual socket. Using the command line, run “esxtop”. Always ensure that the size of the physical CPU and. As a result, a Windows host sees 2 CPUs, each one having about 50% of total CPU power. So, in your case, it will always wait until 22 physical cores are available before a CPU cycle can be processed. NOTE: At the time of writing the maximum vCPU limit per VM is 36 on i3 instances based on the AWS server hardware capabilities. To upscale we are thinking of adding more DL385's and installed more memory on all the servers. vCPUs are assigned to VM based on the workloads, a higher workload requires a higher vCPU to process and perform the tasks easier and smoother, hence you need to know your workload and application profiles to determine the right configurations for your VMs. If in put in simple words - in x86/x64 CPU achitecture one physical core can basicly run one instruction from only one thread at a time. Your process use a specific CPU or many CPU. For example, if you need to configure a VM to use 2-processor sockets, each has 2 CPU cores, then the total number of logical CPUs is 2*2=4. Using the VMware ESXi web client (HTML5), you can monitor host and guest processor (CPU) utilization and other host CPU information. This issue occurs when CPU reservation set on the virtual machine exceeds the physical CPU core capacity for the available ESXi hosts. Multiple vCPU’s, the hypervisor CPU scheduler must wait for physical CPU’s to become available Over allocation could result in poor performance. 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. I am a VMWare admin and was recenlty asked by a customer in our cloud environment to add an extra vCPU to one of their VMs so that it aligned more with the physical counterpart they had migrated away from. Maximum number of Cost items = 25. VM CPU RDY=(Average RDY Core 1) + (Average RDY Core 2) +. Virtual CPU-to-Physical CPU Ratio As a general guideline, attempt to keep the CPU Ready metric at 5 percent or below. For example, "0,2-4,7" would indicate processors 0, 2, 3, 4 and 7. 5K user OVAs" since those are 2 vCPU each. 3). 7. 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. Your example would give you 6 cores to work with. The calculator will then output the. PreferHT=1. 1 vCPU, requests are processed quickly. First of all, you need to start with the underlying hardware, CPU and memory. To start with Physical component. Active CPU is approximately equal to the ratio of the used CPU to the available CPU. (ESXI Installed). You can configure virtual machines with one or more virtual processors, each with its own set of registers and control structures. 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. In this example, you would need to purchase. How VMware CPU Scheduling Works: You have one Physical Hypervisor (ESXI) with one physical CPU, 12 cores and 16 virtual machines. CORE = Logical Processor in physical chipset. The number of physical cores i. Note that these ready time values are per vCPU. VMware vSphere 8. LOGICAL PROCESSOR = Amount of CPU's presented to the ESX Host. Maximum Memory Contention among all the VMs. That is, the license will cover CPUs with up to 32 physical cores. (16 Threads x 8 Cores) x 1 CPU = 128 vCPU. For every CPU cycle it always waits until there is a physical core available for each virtual CPU on a VM. This could be a lot higher or lower depending on work load and how many vCPUs you allocate to VMs. For example, A 8 cores/ 16 threads CPU has (16 Threads x 8 Cores) x 1 CPU = 128 vCPUs. In that case, adding a vCPU to the VM may provide. CPU: VMware Horizon DaaS recommends setting a 10x over commit ratio for CPU. The CPU scheduler for a VM with normal latency sensitivity can move the virtual CPUs of the VM across any physical CPU of the host. In vSphere, administrators assign CPUs to virtual machines in order to support the workload needs of each individual virtual machine. When a virtual machine is scheduled, its virtual processors are scheduled to run on physical processors. 02-18-2015 04:51 AM. I am trying to understand vCPU concept in VMware.