"psrinfo" displays information about processors and virtual processors (USIV supports virtual processors; Each physical processor may support multiple virtual processors & each virtual processor may support multiple virtual processors)

govinda@/users/techno> psrinfo
0 on-line since 09/03/2004 17:17:07
1 no-intr since 09/05/2004 14:11:56
2 no-intr since 09/05/2004 14:11:56
3 no-intr since 09/05/2004 14:11:56
512 on-line since 09/03/2004 17:17:14
513 no-intr since 09/05/2004 14:11:56
514 no-intr since 09/05/2004 14:11:56
515 no-intr since 09/05/2004 14:11:56

"psrinfo -p" display the number of physical processors in a system; shows additional information about each physical processor with "-v" flag. -v stands for verbose mode; with -v flag, "psrinfo" displays information about processor type, floating point unit type and clock speed. If any of this information cannot be determined, psrinfo displays unknown.

govinda@/users/techno> psrinfo -p
4

govinda@/users/techno> psrinfo -pv
The UltraSPARC-IV physical processor has 2 virtual processors (0, 512)
The UltraSPARC-IV physical processor has 2 virtual processors (1, 513)
The UltraSPARC-IV physical processor has 2 virtual processors (2, 514)
The UltraSPARC-IV physical processor has 2 virtual processors (3, 515)

govinda@/users/techno> psrinfo -v
Status of virtual processor 0 as of: 09/09/2004 20:57:59
on-line since 09/03/2004 17:17:07.
The sparcv9 processor operates at 1200 MHz,
and has a sparcv9 floating point processor.
Status of virtual processor 1 as of: 09/09/2004 20:57:59
no-intr since 09/05/2004 14:11:56.
The sparcv9 processor operates at 1200 MHz,
and has a sparcv9 floating point processor.
Status of virtual processor 2 as of: 09/09/2004 20:57:59
no-intr since 09/05/2004 14:11:56.
The sparcv9 processor operates at 1200 MHz,
and has a sparcv9 floating point processor.
Status of virtual processor 3 as of: 09/09/2004 20:57:59
no-intr since 09/05/2004 14:11:56.
The sparcv9 processor operates at 1200 MHz,
and has a sparcv9 floating point processor.
Status of virtual processor 512 as of: 09/09/2004 20:57:59
on-line since 09/03/2004 17:17:14.
The sparcv9 processor operates at 1200 MHz,
and has a sparcv9 floating point processor.
Status of virtual processor 513 as of: 09/09/2004 20:57:59

Reference:
Solaris man page of "psrinfo"