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The vCPU count of the VM is increased to 16 vCPUs as a consequence, this configuration exceeds the physical core count. Keep the cache map in mind when we start to consolidate multiple vCPUs into sockets. Each socket is listed and with each logical processor a cache map is displayed.
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(Linux machines contain the command numactl – – hardware and use lstopo -s to determine cache configuration). Microsoft Sysinternals tool CoreInfo exposes the CPU architecture in the virtual machine with great detail. To match the physical placement, a single virtual NUMA node is exposed to the virtual machine. The constructs virtual nodes and physical domains will be covered later in detail.Īll 10 virtual sockets are grouped into a single physical domain, which means that the vCPUs will be scheduled in a single physical CPU package that typically is similar to a single NUMA node. The last entry summarizes the virtual NUMA topology of the virtual machine. The resPerSocket = 1 indicates that it’s configured with one core per socket. The VM is configured with 10 vCPUs (numvcpus). When using this one-liner after powering-on a 10-vCPU virtual machine on the dual E5-2630 v4 (10 cores per socket) ESXi 6.0 host the following NUMA configuration is shown: *|numa.*|numaHost.*" "/$path/vmware.log" echo -e done Vmdumper -l | cut -d \/ -f 2-5 | while read path do egrep -oi "DICT.*(displayname.*|numa.*|cores.*|vcpu.*|memsize.*|affinity.*)=. Using the following one-liner we can explore the NUMA configuration of active virtual machines on an ESXi host: * When using the advanced setting “=TRUE”, SMT threads are counted instead of cores to determine scheduling options.
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#VMWARE ESXI 5 ADD CPU TO HOST UPGRADE#
If you are using VMs with a non-default Cores per Socket setting and planning to upgrade to ESXi 6.5, please read this article, as you might want to set a host advanced settings before migrating VMs between ESXi hosts. Understanding elemental behavior is crucial for building a stable, consistent and proper performing infrastructure. A big step forward in improving performance is the decoupling of Cores per Socket setting from the virtual NUMA topology sizing. Some changes are made in ESXi 6.5 with regards to sizing and configuration of the virtual NUMA topology of a VM.