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psradm(8)
NAME
  psradm, offline, online - Stops and starts processors in a multiprocessor
  system

SYNOPSIS
  /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 ...]

DESCRIPTION
  On a multiprocessor system, the psradm command puts one or more processors
  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 identification
  numbers.

  The offline command puts one or more processors off line (stops a
  processor).  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
  processor).  If no processors are specified, all processors that are off
  line are started.

  Note that you cannot use these commands to start or stop the master
  processor in a multiprocessor system.

  You must be the root user to use this command.

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

FLAGS
  The following flags apply only to the psradm command:

  -a	    Specifies that all the processors except the master processor be
	    put off line or on line.

  -f	    Puts the specified processor off line.

  -n	    Puts the specified processor on line.

  The following flag applies to all forms of the command:

  -v	    Displays a message about the status of the operation performed on
	    each processor.




EXAMPLES
  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

RESTRICTION
  Do not use the psradm command to disable CPUs when benchmarking
  performance, 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.

FILES
  /var/adm/wtmp

RELATED INFORMATION
  psrinfo(1), pset_info(1), processor_sets(4)