http://www.alper.net/ Eyup Alper Yoney

Numbers of CPU Cores in Solaris 10

The psrinfo is a tool that reports the numbers of physical processors and numbers of virtual processors. Most unfortunate, it is not possible to find out numbers of cores in the Solaris 10 psrinfo output.  Below output shows that my configuration has got 2 physical processors and total 16 virtual processors.

alper:~ $ psrinfo -vp
The physical processor has 8 virtual processors (0-7)
SPARC64-VII (portid 1024 impl 0x7 ver 0x91 clock 2400 MHz)
The physical processor has 8 virtual processors (8-15)
SPARC64-VII (portid 1032 impl 0x7 ver 0x91 clock 2400 MHz)

To find out the numbers of cores, you need analyze the kstat output. The below output shows that virtual CPU instance: 0 belongs to cpu core 0 (core_id line in output).

alper:~ $ kstat cpu_info
module: cpu_info                        instance: 0
name:   cpu_info0                       class:    misc
        brand                           SPARC64-VII
        chip_id                         1024
        clock_MHz                       2400
        core_id                         0
        cpu_fru                         hc:///component=/MBU_A/CPUM0
        cpu_type                        sparcv9
        crtime                          126.7569109
        current_clock_Hz                2400000000
        device_ID                       279287011836295
        fpu_type                        sparcv9
        implementation                  SPARC64-VII (portid 1024 impl 0x7 ver 0x91 clock 2400 MHz)
        snaptime                        10650736.0805644
        state                           on-line
        state_begin                     1269762960
        supported_frequencies_Hz        2400000000

Therefore, it is possible to find out the number of cores by counting numbers of unique core_id in `kstat cpu_info` command.

alper:~ $ kstat cpu_info | grep core_id | awk '{ print $2}' | uniq | wc -l
       8

Briefly, my configuration has got 2 physical processors, 8 cores (4 in each physical processor), and 16 virtual processors (2 in each core).