Solution : https://service.sap.com/sap/support/notes/1329360 (SAP Service marketplace login required)
Summary :
SAP recommends enabling Hyperthreading on HP-UX servers with Dual/Multi-Core Itanium processors to improve SAP application performance, particularly on larger NUMA/Cell-based servers due to their high memory latency access times. Hyperthreading allows one physical core to execute two hardware threads, thus optimizing idle times caused by memory stalls. However, it does not increase the number of physical cores, and in some cases, it might not enhance performance, necessitating deactivation or adjustment using HP-UX's PSET functionality. For configuration, use the commands `setboot -m on` and `kctune lcpu_attr=1` on HP-UX. Additional details can be found in HP's resources mentioned in the documentation.
Key words :
/en/os/hpux11i-kod-montecito-hyper-threading, make system sizing/tuning decisions based, hardware maintains processor states/instruction streams, hyperthreading primarily increases total system throughput, cpu intensive processes/bottleneck processes, sap workloads system pre-requisites, higher memory latency access times, increasing total system throughput, dual/multi-core itanium processors, shared functional/execution units
Related Notes :
| 1075118 | SAP on HP-UX: FAQ |
| 1031960 | Recommendations and availability of HP-UX 11.31 |
| 172747 | SAP on HP-UX: OS kernel parameter recommendations |