[RFE] PCP Power consumption metrics
Environment
- Red Hat Enterprise Linux 8
- Performance Co-Pilot (PCP)
- pmda-denki
Issue
Utilities such as powertop are able to query the system's power consumption. It would be helpful if those same metrics were captured by Performance Co-Pilot so that we could chart power consumption along with other metrics.
We would appreciate really fine data (per disk, cpu, pci device, etc) but happy even with a raw consumption numbers.
Resolution
An implementation of pmda-denki, the Performance Metrics Domain Agent (PMDA) for handling metrics related to electrical power, has landed in upstream PCP and is available in RHEL8.6GA and later.
pmda-denki implements
- consumption metrics based on Running Average Power Limit (RAPL) readings, available on recent Intel and AMD cpus. This requires a kernel based on upstream kernel 5.x for being usable on AMD cpus.
- consumption metrics based on battery discharge, available on systems which have a battery.
The upstream request was tracked as PCP Issue 535, and the request for inclusion into rhel in (private) bz1629455.
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