NAME    [Toc]    [Back]

       psradm, offline, online - Stops and starts processors in a
       multiprocessor system

SYNOPSIS    [Toc]    [Back]

       /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    [Toc]    [Back]

       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 processor 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.

DESCRIPTION    [Toc]    [Back]

       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    [Toc]    [Back]

       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    [Toc]    [Back]

       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

FILES    [Toc]    [Back]

SEE ALSO
       Commands: pset_info(1), psrinfo(1)

       Files: processor_sets(4)



                                                        psradm(8)