CP-U handles all processes while two CP-Us are available

[Huu-Quan]

Hi,

The customrer would like to know why only one CP-U handles all processes while two CP-Us are available. The server is RP74xx.

The root cause(s)??

Thanks and regards,
Huu-Quan

[Shaikh Imran]

hi,
Could you please give some more inputs.
such as
sar o/p
top o/p
pointing this case.

Regards,

[Muthukumar_5]

hai,

Get the processor configuration on the system as # mpsched -s

Check the binding informations on the processors with # mpsched -q

Schedule a new process to run on the not running cpu with mpsched(1) call.

Check the cpu status with sar or top command

Regards,
Muthukumar.

[rick jones]

If the processes aren't hard bound to the CPU (or pset with that CPU) then perhaps there isn't enough work to do to keep both CPUs going. One CPU will not "steal" processes from another unless they remain runnable for some length of time and don't actually run. So, if they run often enough, they will not migrate to the other CPUs.

BTW, it would also be good to mention the OS version.