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

[youngnastyman]

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!

[prabinseth]

Hi all,

As i have seen in so many complicated processes / apps to get number of physically socketed CPUs. But guys, i think its really simple to get the stats.Here are my 2 cents..

1. number of physical processors :

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

2. number of cores :

# cat / proc/cpuinfo | grep "cpu cores" | uniq

3. find if ht enabled

# cat /proc/cpuinfo | grep "ht" | uniq

if u see "ht" in flags then ht is enabled

suppose cpuinfo gives u the numbers

CPUs = 24 (0 to 23 )
siblings in each CPU = 12
CPU cores in each CPU = 6

that means each CPU is hyper threading enabled.

siblings (12 ) = cores (6) x hyper-threading (2)

number of physical CPUs = 24 / 12 = 2 !


chaos!
prabin

[Rubberman]

Hi all,

As i have seen in so many complicated processes / apps to get number of physically socketed CPUs. But guys, i think its really simple to get the stats.Here are my 2 cents..

1. number of physical processors :

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

2. number of cores :

# cat / proc/cpuinfo | grep "cpu cores" | uniq

3. find if ht enabled

# cat /proc/cpuinfo | grep "ht" | uniq

if u see "ht" in flags then ht is enabled

suppose cpuinfo gives u the numbers

CPUs = 24 (0 to 23 )
siblings in each CPU = 12
CPU cores in each CPU = 6

that means each CPU is hyper threading enabled.

siblings (12 ) = cores (6) x hyper-threading (2)

number of physical CPUs = 24 / 12 = 2 !


chaos!
prabin

Prabin, for your first posting here, this is awesome! Congratulations, and welcome to the forums!

[alopgeek]

A little expansion on what was provided makes it scriptable

#!/bin/bash

numCPU=`cat /proc/cpuinfo | grep -c processor`
numPhys=`cat /proc/cpuinfo | grep "physical id" | sort -n | uniq | wc -l`
numCores=`cat /proc/cpuinfo | grep "cpu cores" | uniq | awk '{print $NF}'`
cat /proc/cpuinfo | grep -q "ht"
isHT=$?
numThrd=1
if [ $isHT -eq 0 ]
then
numThrd=2
fi

sibs=$(($numCores * $numThrd))
socks=$(($numCPU / $sibs))

echo "Physical sockets are $socks"

[Seth_Miller]

#!/bin/bash

numCPU=`cat /proc/cpuinfo | grep -c processor`
numPhys=`cat /proc/cpuinfo | grep "physical id" | sort -n | uniq | wc -l`
numCores=`cat /proc/cpuinfo | grep "cpu cores" | uniq | awk '{print $NF}'`
cat /proc/cpuinfo | grep -q "ht"
isHT=$?
numThrd=1
if [ $isHT -eq 0 ]
then
numThrd=2
fi

sibs=$(($numCores * $numThrd))
socks=$(($numCPU / $sibs))

ARR[1]="Physical sockets are $socks"

case $numThrd in
1)
ARR[2]="Hyperthreading is NOT enabled"
;;
2)
ARR[2]="Hyperthreading is enabled"
;;
esac

ARR[3]="Number of cores not counting hyperthreads is $numCores"

ARR[0]=""
for i in $(seq 0 ${#ARR[*]}); do
echo ${ARR[$i]}
done

[matonb]

Micro tweak so it doesn't barf if there are no physical cores (VM)

#!/bin/bash

numCPU=`cat /proc/cpuinfo | grep -c processor`
numPhys=`cat /proc/cpuinfo | grep "physical id" | sort -n | uniq | wc -l`
numCores=`cat /proc/cpuinfo | grep "cpu cores" | uniq | awk '{print $NF}'`
if [ -Z $numCores ]; then
numCores=0
fi
cat /proc/cpuinfo | grep -q "ht"
isHT=$?
numThrd=1
if [ $isHT -eq 0 ]
then
numThrd=2
fi

sibs=$(($numCores * $numThrd))
if [ $sibs -ne "0" ]; then
  socks=$(($numCPU / $sibs))
else
  socks="0, Virtual Machine?"
fi

echo "Physical sockets are $socks"