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Operating Systems Linux Red Hat CPU Count
# 1  
CPU Count

Hi,

I am observing high load average on RHEL5 server and need to check the number of core processors available on the box to give me a bigger picture on whether or not I should be worried.

I have always checked the physical count quite simply.....

# grep 'physical id' /proc/cpuinfo | sort | uniq | wc -l
1

....however can anyone confirm that the below output truely represents the actual number of core processors available on my server?

# cat /proc/cpuinfo | grep processor | awk '{a++} END {print a}'
8

R,
D.
# 2  
You get a useless use of cat award. And if you're using awk, why bother using grep?

I'd grep for something a little less generic than 'processor'. That might turn up in a CPU name or something potentially. And pin it to the beginning of the line where it should always be found.

Code:
 awk '/^cpu MHz/ { a++ } END { print a }' /proc/cpuinfo

# 3  
I am aware of that so (without printing the entire cpuinfo) "processor : 7" equates to 8 core CPU's? - Just looking for a consensus/confirmation.
# 4  
It could mean one 8-core CPU, a pair of 4-core CPU's, four 2-core CPU's, or 8 1-core CPU's. Cores are counted individually. If you care which belongs in what chip, that's the physical ID.

If you just care about the number of cores, counting the line match like that will work fine.

In fact, you don't need to even match anything. Just count the number of records, splitting on blank lines, by setting RS to "". Then when awk runs out of input, print NR, the number of records. On my dual-core system:

Code:
$ awk -v RS="" 'END { print NR }' /proc/cpuinfo
2
$

# 5  
Yip, simply looking for the number of cores which according to this is 8. Thing is though it does not correspond to what the hardware mgmt interface sayes?

# hpasmcli
HP management CLI for Linux (v2.0)
Copyright 2008 Hewlett-Packard Development Group, L.P.
hpasmcli> show server
System : ProLiant BL460c G6
Serial No. : GB8033X7FV
ROM version : I24 03/30/2010
iLo present : Yes
Embedded NICs : 2
NIC1 MAC: 78:e7:d1:65:3a:60
NIC2 MAC: 78:e7:d1:65:3a:64
Processor: 0
Name : Intel Xeon
Stepping : 5
Speed : 2933 MHz
Bus : 133 MHz
Core : 4
Thread : 8
Socket : 1
Level2 Cache : 1024 KBytes
Status : Ok
Processor total : 1

R,
D
# 6  
If you'd bothered posting your /proc/cpuinfo, I might be able to explain, but at present I can only guess.

Do your CPU's have hyperthreading? That will show up as double the number of cores in Linux.
# 7  
Ok, cpuinfo attached...

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