psradm man page on DigitalUNIX

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psradm(8)							     psradm(8)

       psradm, offline, online - Stops and starts processors in a multiproces‐
       sor system

       /usr/sbin/psradm -f  [-v] [[-a] [processor_id...]]

       /usr/sbin/psradm -n  [-v] [[-a] [processor_id...]]

       /usr/sbin/online [-v] [processor_id...]

       /usr/sbin/offline [-v] [processor_id...]

       The following options apply only to the psradm command: Specifies  that
       all  the	 processors  except the master processor be put off line or on
       line.  Puts the specified processor off line.  Puts the specified  pro‐
       cessor on line.

       The  following  option  applies to all forms of the command: Displays a
       message about the status of the operation performed on each processor.

       On a multiprocessor system, the psradm command puts one or more proces‐
       sors off line (stops a processor) or on line (starts a processor).

       The processor_id variable specifies an integer that uniquely identifies
       a processor.  Use the psrinfo command to display processor  identifica‐
       tion numbers.

       The  offline command puts one or more processors off line (stops a pro‐
       cessor).	 If no processors are specified, all processors	 that  are  on
       line are stopped except the master processor.

       The  online  command puts one or more processors on line (starts a pro‐
       cessor).	 If no processors are specified, all processors that  are  off
       line are started.

       You must be the root user to use this command.

       The  /var/adm/wtmp file contains information about successful processor
       state transitions.

       Do not use the psradm command to disable CPUs when benchmarking perfor‐
       mance,  because	the command does not provide an accurate reflection of
       the performance of a system that actually  has  fewer  CPUs.   Accurate
       performance  results are obtained only when you disable the CPUs at the
       SRM console command level.

       On platforms that do not support primary	 processor  reassignment,  you
       cannot use the off line command options to stop the boot processor in a
       multiprocessor system.

   AlphaServer GS80/GS160/GS320 Series
       Each quad building block	 (QBB)	on  the	 AlphaServer  GS80/GS160/GS320
       series  assigns	one  processor to take interrupts for that QBB. If you
       attempt to take this processor off line, the following  error  is  dis‐
       played: offline: processor N: Invalid argument

       An  interrupt-handling  processor  has an identifier number (N) that is
       evenly divisible by 4. At present, there	 is  no	 method	 of  migrating
       interrupts  to  another processor, therefore, you cannot take this pro‐
       cessor off line.

   AlphaServer ES47/ES80/GS1280 Series
       Each CPU on the AlphaServer ES47/ES80/GS1280 series has the capacity to
       handle  I/O  interrupts	from  either a locally attached I/O adapter or
       from another CPU that has been offlined. However, each CPU  is  limited
       to  handling  the  I/O  interrupts of two CPUs total, including its own
       local I/O. Therefore, on a system with X I/O hoses, the largest	number
       of CPUs that can be offline at any one time is (X/2).  Attempts to off‐
       line more CPUs will result in the following error message from psradm:
	offline: processor N: Invalid argument

       There is currently no command to tell you which CPUs are	 handling  I/O
       interrupts from which I/O adapters.

       The following command puts processors 2 and 3 off line: # psradm -f 2 3
       The following command puts all the processors on line: # psradm	-n  -a
       The following command puts all processors on line: # online -v

       Commands: pset_info(1), psrinfo(1)

       Files: processor_sets(4)


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