[Linux] ps.util_freq() takes more than 5 seconds on AMD Epyc 7742

[lbhm]

Summary

• OS: Ubuntu 20.04.1 LTS
• Architecture: x86_64
• Psutil version: 5.8.0
• Python version: 3.8.5
• Type: performance

Description

I recently got access to a dual-socket AMD Epyc 7742 machine with a total of 256 logical cores. One of the first things I did was to install bpytop to monitor system behavior. However, I noticed that bpytop reacts very slowly on this machine. When I reached out to the bpytop community, they asked me to run scripts/internal/print_api_speed.py from the psutil repo and it showed that cpu_freq takes 5.11 seconds.

Could this issue be related to the core count of the CPUs or to their relative novelty? I'd appreciate any help on how I can improve the performance of cpu_freq() on the system.

[giampaolo]

This was addressed in #1851, which is still unreleased. You can get it by using latest GIT master version.