Determining Number of Physical CPU

sagarparadkar · 01-18-2005, 06:19 AM

Dear All,

I wanted to find out how many physical CPUs are present in my Linux and Sun Solaris Server.

I believe there must be some OS commands to accomplish this, but could not remember any. Can someone inform me these commands...

Thanks in advance.

Regards,
Sagar Paradkar

kojak · 01-18-2005, 08:04 AM

cat /proc/cpuinfo

or dmesg

twantrd · 01-18-2005, 03:10 PM

/proc/cpuinfo works for linux, not solaris. To find out for solaris, there's a couple ways:

1. psrinfo -v
2. /usr/platform/sun4u/sbin/prtdiag -v

-twantrd

sagarparadkar · 01-18-2005, 10:25 PM

Hi all,

Thanks to kojak and twantrd...

Actually cat /proc/cpuinfo works nice for Linux. But 'dmesg' may not give you the number of CPUs if you are getting several messages fired to the console by any other applications, as the concerned file gets overwritten...

For Solaris I checked with 'psrinfo -v' and it worked nice.

Thanks again...

Regards,
Sagar

vwvr9 · 01-12-2009, 10:08 PM

cat /proc/cpuinfo | egrep "processor|physical\ id|core\ id|cpu\ cores"

Look at the "physical\ id" for physical CPU count and "cpu\ cores" for the core count

Code:

[root@abibi ~]# cat /proc/cpuinfo | egrep "processor|physical\ id|core\ id|cpu\ cores"
processor       : 0
physical id     : 0
core id         : 0
cpu cores       : 4
processor       : 1
physical id     : 0
core id         : 1
cpu cores       : 4
processor       : 2
physical id     : 0
core id         : 2
cpu cores       : 4
processor       : 3
physical id     : 0
core id         : 3
cpu cores       : 4
processor       : 4
physical id     : 1
core id         : 0
cpu cores       : 4
processor       : 5
physical id     : 1
core id         : 1
cpu cores       : 4
processor       : 6
physical id     : 1
core id         : 2
cpu cores       : 4
processor       : 7
physical id     : 1
core id         : 3
cpu cores       : 4
[root@abibi ~]#