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vSphere High Performance Essentials by Christian Stankowic

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Non-uniform memory access

Non-uniform memory access (NUMA) is a technology that focuses on servers with multiple CPU sockets. All CPU and memory sockets are divided in multiple NUMA nodes, having very fast access to their node's memory (local memory). It is also possible to access other node's (non-local) memory resources—with lower speed. Basically, all processors can access all the memory resources, as it is distributed shared memory (DSM). NUMA is the opposite of uniform memory access (UMA), where all the CPUs share the same memory resources. Using NUMA is highly recommended as it can heavily improve the performance and scalability of high-performance workloads. NUMA-aware applications that stay in their node can achieve greater performance. ...

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