Processor utilization difference between IBM AIX and Linux on Power – apple to apple comparison
The overall system-level processor utilization between AIX and Linux on Power for identical workload and Power hardware configurations in multicore SMT systems can't be compared because the calculations are completely different. The overall system-level processor utilization reported in Linux on Power is derived from /proc/stat, which is purely time based. Whereas, AIX is based on PURR and SPURR, which is more towards CAPEX planning and also projects more realistic and accurate processor utilization for the latest evolution of processors which has SMP and SMT environment. Actual performance difference between single threaded and SMT8 on POWER8 is 2.2 times. In time-based calculations, processor utilization report for a single thread projects as if each SMT thread and execution unit is independent of the other. This gives a notion that users can achieve eight times better performance in the SMT8 mode, which is not true in real world. The realistic 2.2 times processor utilization factor that is not accounted in the calculation is one of the reasons for the low processor utilization reported in Linux on Power system for certain workloads that do not utilize 100% core, when compared to the AIX on Power platform.
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