[linux] associate threads with cores

[nschloe]

Summary

• OS: Linux
• Type: core

Description

With

psutil.cpu_percent(percpu=True)

I get eight percentages on machine, one for each thread. (My machine has four cores with two threads each.)

I would like to know which thread belongs to which core to be able to associate temperatures (psutil.sensors_temperatures()["coretemp"]) accordingly.

This becomes increasingly interesting with the advent of machines where only a number of cores have multiple threads, and others don't (efficiency cores).

On Linux (Unix?), this information is given in /proc/cpuinfo as core id:

processor	: 0
vendor_id	: GenuineIntel
cpu family	: 6
model		: 142
model name	: Intel(R) Core(TM) i5-8350U CPU @ 1.70GHz
stepping	: 10
microcode	: 0xf0
cpu MHz		: 3100.396
cache size	: 6144 KB
physical id	: 0
siblings	: 8
core id		: 0
cpu cores	: 4
apicid		: 0
initial apicid	: 0
[...]

processor	: 1
vendor_id	: GenuineIntel
cpu family	: 6
model		: 142
model name	: Intel(R) Core(TM) i5-8350U CPU @ 1.70GHz
stepping	: 10
microcode	: 0xf0
cpu MHz		: 3099.999
cache size	: 6144 KB
physical id	: 0
siblings	: 8
core id		: 1
cpu cores	: 4
apicid		: 2
initial apicid	: 2

[...]

[dbwiddis]

Probably relates to #2034