Core number on SunOs

psrinfo -v

Should give you some processor info.

psrinfo -pv

Right, but this command shows number of physical processors along with the number of virtual processors which are not necessary cores. They could also be just threads.

So, in general I don't see a way to determine number of cores per physical CPU using only this command.

prtdiag -v

Ok, this command produces the following output for CPUs

==================================== CPUs ====================================
               E$          CPU                    CPU
CPU  Freq      Size        Implementation         Mask    Status      Location
---  --------  ----------  ---------------------  -----   ------      --------
0    1503 MHz  1MB         SUNW,UltraSPARC-IIIi    3.4    on-line     MB/P0
1    1503 MHz  1MB         SUNW,UltraSPARC-IIIi    3.4    on-line     MB/P1

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Still, number of cores is not clear here.
I tried to search over the web, is seems like there is no reliable way to identify number of cores per CPU on SunOs 5.9

That's true. I have found somewhat more on the Web:

UltraSPARC III -- single core, no multithreading
UltraSPARC IV, IV+ -- dual core, no multithreading
UltraSPARC T1 -- 4, 6, 8 cores, 4 threads per core
UltraSPARC T2, T2+ -- 8 cores, 8 threads per core
SPARC T3 -- 8 or 16 cores, 8 threads per core
SPARC T4 -- 8 cores, 8 threads per core

There is also a line of SPARC64 processors. Does anybody knows if they are related to the above line of go separately?

try this -

 echo "`hostname` has `kstat cpu_info | grep core_id | uniq | wc -l` cores"

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I just tried the kstat cpu_info on 2 servers a T2000 and a V240

the V240 has 2 physicals each with 1 core
 

and the T2000 showed 8 cores.

@jgiordano -- this is a good solution, but as a I posted in the very first comment "core_id" is not present in the output.

I think the reason is that it's SunOS 5.9. SunOS 5.10 that I have in lab show "core_id" in the output of kstat.

Oh, so you suggest that Solaris 9 doesn't support T chips.
I need to check this.

Thanks for an idea!