Solaris

psrinfo -pv

number of physical cpu: "psrinfo -p"
number of cores: "kstat cpu_info|grep core_id|sort -u|wc -l"
number of threads: "psrinfo -pv"

root@pbiudb01 # psrinfo -p
2
root@pbiudb01 # psrinfo -pv
The physical processor has 64 virtual processors (0-63)
  UltraSPARC-T2+ (cpuid 0 clock 1165 MHz)
The physical processor has 64 virtual processors (64-127)
  UltraSPARC-T2+ (cpuid 64 clock 1165 MHz)
root@pbiudb01 # kstat cpu_info|grep core_id|sort -u|wc -l
      16

# echo "`psrinfo -p` socket(s)"
2 socket(s)

# echo "`kstat -m cpu_info|grep -w core_id|uniq|wc -l` core(s) "
8 core(s)

# echo "`psrinfo|wc -l` logical (virtual) processor(s)" 
64 logical (virtual) processor(s)