Two systems I know from HPC that more usefully expose various architectures' RAPL etc. to userland via a daemon for application profiling are https://variorum.r

Two systems I know from HPC that more usefully expose various architectures' RAPL etc. to userland via a daemon for application profiling are https://variorum.readthedocs.io/ https://variorum.readthedocs.io/ and https://hpc.fau.de/research/tools/likwid/ https://hpc.fau.de/research/tools/likwid/. Of course other sources of power consumption than CPU/uncore and GPU may be significant. For whole-node power on typical racked systems, I'd expect to interrogate the power strips or similar supplies with SNMP or otherwise.