How does NUMA work in VMware?

The virtual CPUs of the virtual machine are constrained to run on the home node to maximize memory locality. The NUMA scheduler can dynamically change a virtual machine’s home node to respond to changes in system load. The scheduler might migrate a virtual machine to a new home node to reduce processor load imbalance.

What is VM NUMA?

vNUMA (virtual non-uniform memory access) is a memory-access optimization method for VMware virtual machines (VMs) that helps prevent memory-bandwidth bottlenecks. If a VM has more than eight vCPUs, vNUMA is automatically enabled.

What is NUMA used for?

NUMA (non-uniform memory access) is a method of configuring a cluster of microprocessor in a multiprocessing system so that they can share memory locally, improving performance and the ability of the system to be expanded. NUMA is used in a symmetric multiprocessing ( SMP ) system.

What does NUMA mean and how does it work?

(Non-Uniform Memory Access) A multiprocessing architecture in which memory is separated into close and distant banks. NUMA is similar to SMP, in which multiple CPUs share a single memory. However, in SMP, all CPUs access a common memory at the same speed.

What is NUMA support?

The traditional model for multiprocessor support is symmetric multiprocessor (SMP). In this model, each processor has equal access to memory and I/O. System designers use non-uniform memory access (NUMA) to increase processor speed without increasing the load on the processor bus.

What is a socket in a VM?

Virtual socket and virtual socket are “constructs” presented upstream to the tightly isolated software container which we call a virtual machine. When you run a operating system it detects the hardware (layout) within the virtual machine. The VMkernel schedules a Virtual Machine Monitor (VMM) for every vCPU.

What is NUMA optimization?

NUMA optimization makes the VPC VM aware of the host NUMA architecture, enabling it to reduce memory latency by using local memory and thereby allocate more CPU cycles for packet processing.

What is NUMA topology?

Non-uniform memory access (NUMA) NUMA is a derivative of the SMP design that is found in many multi-socket systems. In a NUMA system, system memory is divided into cells or nodes that are associated with particular CPUs. Requests for memory on other nodes are possible through an interconnect bus.

What is NUMA balancing?

Automatic NUMA balancing improves the performance of applications running on NUMA hardware systems. Automatic NUMA balancing moves tasks (which can be threads or processes) closer to the memory they are accessing. It also moves application data to memory closer to the tasks that reference it.

What is a NUMA domain?

A multiprocessing (multi-die) architecture in which each processor is attached to its own local memory (called a NUMA domain) but can also access memory attached to another processor.