An affinity score measures the proximity of memory to a processor, crucial in IBM Power systems using a non-uniform memory access (NUMA) architecture. A score of 100 signifies optimal performance, while 0 indicates inefficiency. Local memory access boosts performance, but factors like adding partitions or using Live Partition Mobility (LPM) can reduce it, increasing CPU utilization due to delayed memory access. Users can check their system's affinity score on the HMC or via IBM i performance data, specifically the QAPMSYSAFN file. The Dynamic Platform Optimizer (DPO) can enhance memory affinity without downtime, but may affect overall server performance if run during peak hours. May advises regular review of affinity scores and suggests consulting the IBM i Performance FAQ for further insights into system performance optimization.
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