Cpuinfo

Christian Külker

0.1.2

2023-05-19

There is a lot of useful information in /proc/cpuinfo. However, modern server boards have many CPUs and sometimes even more cores. In order to keep track of this long information, sometimes this information needs to be pre-processed a bit. This article is about some small scripts to get specific information.

Model Name

grep -i 'model name' /proc/cpuinfo|uniq

Machine     Model Name
=========================================================================
X200 Tablet Intel(R) Core(TM)2 Duo CPU     L9400  @ 1.86GHz
Super Micro Intel(R) Xeon(R) CPU E5-2658 0 @ 2.10GHz
MIC         0b/01

Number Of Calculation Cores

grep -i 'processor' /proc/cpuinfo|wc -l

Machine     Model Name                                              Value
=========================================================================
X200 Tablet Intel(R) Core(TM)2 Duo CPU     L9400  @ 1.86GHz             2
Super Micro Intel(R) Xeon(R) CPU E5-2658 0 @ 2.10GHz                   16
MIC         0b/01                                                     244

Number Of Real Cpu Cores:

Physical ID

grep -i "physical id" /proc/cpuinfo|sort -u|uniq|wc -l

Machine     Model Name                                              Value
=========================================================================
X200 Tablet Intel(R) Core(TM)2 Duo CPU     L9400  @ 1.86GHz             1
Super Micro Intel(R) Xeon(R) CPU E5-2658 0 @ 2.10GHz                    2
MIC         0b/01                                                       1

Core ID

grep -i 'core id' /proc/cpuinfo|uniq|wc -l

Machine     Model Name                                              Value
=========================================================================
X200 Tablet Intel(R) Core(TM)2 Duo CPU     L9400  @ 1.86GHz             2
Super Micro Intel(R) Xeon(R) CPU E5-2658 0 @ 2.10GHz                   16
MIC         0b/01                                                      62

However, the cpu cores value for MIC is set to 61. And 244 cores divided by 4 is 61, not 62.

CPU Cores

grep -i 'cpu cores' /proc/cpuinfo|uniq|sed -e 's%cpu cores.*: %%'

Machine     Model Name                                              Value
=========================================================================
X200 Tablet Intel(R) Core(TM)2 Duo CPU     L9400  @ 1.86GHz             2
Super Micro Intel(R) Xeon(R) CPU E5-2658 0 @ 2.10GHz                    8
MIC         0b/01                                                      61

The Number Of Cores

To make the situation unambiguous, the number or real cores should be calculated as

echo $((`grep -i "physical id" /proc/cpuinfo|sort -u|uniq|wc -l` * \
`grep -i 'cpu cores' /proc/cpuinfo|uniq|sed -e 's%cpu cores.*: %%'`))

Machine     Model Name                                              Value
=========================================================================
X200 Tablet Intel(R) Core(TM)2 Duo CPU     L9400  @ 1.86GHz             2
Super Micro Intel(R) Xeon(R) CPU E5-2658 0 @ 2.10GHz                   16
MIC         0b/01                                                      61

History

Version Date Notes
0.1.2 2023-05-19 Improve writing
0.1.1 2022-07-02 Commands meta data, shell->bash
0.1.0 2016-06-22 Initial release
  • Cpuinfo