How do I get the physical CPU socket count in RHEL?

youngnastyman · 06-30-2011, 09:44 AM

We are working on our subscription renewal and now since Red Hat has changed their subscription model we need to give them the number of physical CPU sockets on each system.

I have tried looking thru /proc/cpuinfo as well as tried to parse data out from dmidecode but both of those solutions count each individual core as a CPU.

Is there a clean and easy way to determine the number of sockets on each system? We also use RHN Satellite to manage our systems but I believe that is pulling the same data from dmidecode.

Help!

smallpond · 06-30-2011, 10:01 AM

/proc/cpuinfo is the way to go - here's part of the last entry on my server:

Code:

processor       : 15
vendor_id       : GenuineIntel
cpu family      : 6
model           : 46
model name      : Intel(R) Xeon(R) CPU           E7520  @ 1.87GHz
stepping        : 6
cpu MHz         : 1862.049
cache size      : 18432 KB
physical id     : 1
siblings        : 8
core id         : 10
cpu cores       : 4

Since these are quad-core processors and I have 16 processors defined, you would think I have 4 chips. But no. Each core is hyperthreaded and counts as 2, so the right thing to look at is "siblings". I have 16 processors / 8 siblings = 2 chips.

Note: so to count them up:
if siblings = S, then each processor = 1/S chips
else if cores = C, then each processor = 1/C chips
else each processor = 1 chip

youngnastyman · 06-30-2011, 10:42 AM

ok so i figured it out! lol...

this is what i did

cat /proc/cpuinfo |grep "physical id" |sort -n |uniq |wc -l

This seems to be the best way for me so far.. unless anyone can think of something better