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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...]

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
  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.

  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
  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.

  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.

  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)

Index for Section 8

Alphabetical listing for P

Top of page