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psradm(8)							    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...]

OPTIONS

  The following	options	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	option applies to all forms of the command:

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

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 proces-
  sor).	 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 proces-
  sor).	 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.


RESTRICTION

  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 com-
  mand 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 multipro-
  cessor system.

  Each quad building block (QBB) on a AlphaServer GS-series system assigns
  one processor	to take	interrupts for that QBB.  If you attempt to take this
  processor off	line, the following error is displayed:

       offline:	processor N: Invalid argument

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

EXAMPLES

   1.  The following command puts processors 2 and 3 off line:
	    # psradm -f	2 3

   2.  The following command puts all the processors on	line:
	    # psradm -n	-a

   3.  The following command puts all processors on line:
	    # online -v



FILES

  /var/adm/wtmp

SEE ALSO

  Commands: pset_info(1), psrinfo(1)

  Files: processor_sets(4)