![]() ![]() When SNC is enabled, the cores are split into two separate clusters, each with four memory channels, resulting in two NUMA domains within a physical processor socket. Intel CPUs have eight memory channels, divided into four groups of two channels each. On Intel CPUs, you can enable or disable sub-NUMA clustering (SNC). The NUMA settings that are available depend on the processor type. For example, you can choose a NUMA setting that uses only the memory that's closer to the core, resulting in higher memory bandwidth and lower memory latency. For most workloads, the difference does not have an effect: the difference is typically in nanoseconds, and is negligible compared to the software running on the CPU.įor high-performance computing (HPC) applications that are memory sensitive and highly tuned for performance, you can get predictable performance by configuring the NUMA settings. ![]() Because of the location of the memory channels relative to the cores, this results in different access times for different memory locations. ![]() With the default NUMA setting, memory is interleaved across all channels of the CPU. The NUMA setting configures how the processor cores access the memory channels, and thereby the memory, on the CPU. CPUs have memory channels that are connected to the memory modules (called DIMMs). With NUMA, the time it takes to access the memory depends on the physical location of the memory relative to the CPU. NUMA is a computer memory design used in multi-core CPUs. Non-uniform memory access (NUMA) configures how the memory is interleaved between cores and memory channels in the CPU. Used to optimize performance for workloads that are highly tuned for performance and have significant memory access. ![]()
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