[BUG] failure to count cpus when cpusets used

[tudorapo]

Describe the bug

When cgroups (systemd slices) are used to restrict the user to a subset of all cpus the cpu count fails and bpytop fails

To Reproduce

1. have an ubuntu 21.10
2. set up a system slice for two cores and an user slice for the remaining cores
3. as an user run bpytop

Expected behavior

bpytop runs

bpytop version: 1.0.61 psutil version: 5.8.0

Ubuntu 21.10 gnome terminal inconsolata, size 16 Python 3.9.7

Additional context At line 259 THREADS is defined as psutil.cpu_count(logical=True). Later this number is used to create the cls.cpu_whatever lists Then a few pages below psutil.cpu_percent(percpu=True) is used to iterate through this array..

but:

psutil.cpu_count(logical=True) 10 len(psutil.cpu_percent(percpu=True)) 12

Changing the original sin line to this: THREADS: int = len(psutil.cpu_percent(percpu=True)) or 1 fixes the bug.

error.log The log is full with my debug prints, sorry.