Evaluating the Energy Measurements of the IBM POWER9 On-Chip Controller

Publikation: Beitrag in Buch/Konferenzbericht/Sammelband/GutachtenBeitrag in KonferenzbandBeigetragenBegutachtung


Dependable power measurements are the backbone of energy-efficient computing systems. The IBM PowerNV platform offers such power measurements through an embedded PowerPC 405 processor: The On-Chip Controller (OCC). Among other system-control tasks, the OCC provides power measurements for several domains, such as system, CPU, and GPU. This paper provides a detailed description and an in-depth evaluation of these OCC-provided power measurements. For that, we describe the provided interfaces themselves and experimentally verify their overhead (3.6 µs to 10.8 µs per access) and readout rate (24.95 Sa/s). We also study the consistency of the reported sensor readouts across the measurement domains and compare it to externally measured data. Furthermore, we estimate the internal sampling rate (1996 Sa/s) by provoking aliasing errors with artificial workloads, and quantify the errors that such aliasing could introduce in practice (for power consumption of processors 12% in our experimental worst-case scenario). Given these insights, practitioners using the IBM PowerNV platform can assess the quality of the embedded measurements, permitting sought-after energy efficiency improvements.


TitelICPE '23: Proceedings of the 2023 ACM/SPEC International Conference on Performance Engineering
ErscheinungsortNew York, NY, USA
Herausgeber (Verlag)Association for Computing Machinery
ISBN (elektronisch)979-8-4007-0068-2
ISBN (Print)979-8-4007-0068-2
PublikationsstatusVeröffentlicht - 15 Apr. 2023


ReiheICPE: ACM/SPEC International Conference on Performance Engineering

Externe IDs

unpaywall 10.1145/3578244.3583729
Scopus 85158099806
ORCID /0000-0002-5437-3887/work/154740528


Ziele für nachhaltige Entwicklung


  • energy efficiency, on-chip controller, power measurements, POWER9