Information About Processor

dayvidvictor · 11-27-2010, 08:36 AM

Hello Everybody, I'm writting an app and I need to get all te informations about a processor. I know I can use

dmidecode -t 7
cat /proc/cpuinfo
hwinfo --cpu
lscpu
(...)

None of these have all the informations I need, and I need to get informations from different places. The problem is that sometimes I can't mix those information.

ex:
dmidecode tells me that there is 2 processors
cat /proc/cpuinfo tells me that there is only
one core, and even when it tells me there is 4,
how can I know if a core is from Processor A or Processor B?.
at other pc I can't know how many cores there is
because of the version of the kernel, cpuinfo doesn't give enought information about it.

I need to run that app for 2.4.X kernel versions and 2.6.X kernel versions.

can anyone help me?

udaman · 11-27-2010, 08:53 AM

From cat /proc/cpuinfo, You can tell which processor the core if from by the physical address. processor 0 on physical id 0, and processor 1 on physical id 0, are two cores from the same cpu socket.

Code:

processor       : 0
.
.
.
physical id     : 0

and

processor       : 1
.
.
.
physical id     : 0

dayvidvictor · 11-27-2010, 02:03 PM

tks udaman,

but the problem is that for older versions of the kernel (like 2.4.XX)
the /proc/cpuinfo isn't complete, doesn't have that much informations.

Right now I can't post the output of a 2.4 version, but it is kind of simple.

do you know if there is some other way to make a match about /proc/cpuinfo and
dmidecode?

how to know the number of cores?
I'm thinking about use lscpu, it gives the number of cores and number of threads
(for hyperthreads cpu), but there would be another binding and another depedence
for my application.

anybody has any idea?