intrbald man page on HP-UX

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intrbald(1M)							  intrbald(1M)

       intrbald - daemon for balancing interrupts

       interval |

       Balancing  interrupts  is a process which distributes interrupts across
       the available CPUs in an optimal fashion.  This action is performed  by
       (see intctl(1M)).

       Performing  frequent  CPU  migrations  between  system  partitions  may
       require you to perform periodic balancing of interrupts.	 This is espe‐
       cially true with systems that use WLM (Workload Manager), iCAP (Instant
       Capacity), and vPars (Virtual Partitions) products.  If	the  frequency
       of  CPU	migration is high, then balancing of interrupts should be per‐
       formed more frequently.

       The daemon monitors the system for imbalance in interrupt distribution.
       If  an  imbalance  is detected after the specified interval executes to
       balance the interrupt distribution.  uses the parameters from the  con‐
       figuration  file	 for  balancing	 the interrupts.  For more information
       about the command, see intctl(1M) and the configuration file.

       The daemon is started from the general purpose  sequencer  script  (see
       rc(1M)),	 at run level 2 and is killed at run level 1.  By default, the
       daemon is not enabled.  The daemon configuration file  must  be	edited
       and  the parameter set to in order to enable running the daemon.	 After
       setting to for the first time, you can start  the  daemon  manually  by
       executing the script Otherwise, the daemon will automatically start the
       next time the system is restarted.

       Any actions performed by the daemon are logged in and details of inter‐
       rupt migrations performed will be logged in the file

       recognizes the following options:

       Instructs the running daemon to reexamine the configuration file
		      If the parameter has been updated, then the running dae‐
		      mon uses the new value.  If the parameter is set to then
		      the running daemon stops executing.

       The daemon checks if the system requires any balancing of interrupts
		      after  interval seconds; the valid range is 5 seconds to
		      seconds (see limits(5)).

		      This value can also be  specified	 persistently  in  the
		      configuration file by setting the parameter.

		      The default value is 60 seconds.

		      Setting  this  value  too	 small	can  cause unnecessary
		      interrupt migrations.

       Gracefully kills the running daemon.

   intrbald rc Configuration File
       is the configuration file.

       The following parameters can be persistently specified in this configu‐
       ration file:
       Specifies if the daemon should be started automatically during the sys‐
       tem bootup process by the script.  The  daemon  will  only  be  started
       automatically if this parameter is set to

	      NOTE:  This value is by default.	Before using the daemon, needs
	      to be changed to in the file.   Then  the	 daemon	 needs	to  be
	      started,	either manually by running or it will be started auto‐
	      matically at next boot via the script.

       The daemon checks if the system requires any
	      interrupt balancing after this interval.	The interval is speci‐
	      fied  in	seconds;  the valid range is 5 seconds to seconds (see
	      limits(5)).  The default is 60 seconds.

	      Setting this value too small could cause	unnecessary  interrupt

       Exit values are:

	      Successful completion.
	      An error condition occurred.

       The command can be executed only by the superuser.  This command should
       be used only by performance analysts for performance  tuning  purposes.
       If  the	interrupts are not redistributed properly, a possible decrease
       in overall system performance can occur.	 Some  processors  can	become
       overloaded while other processors will not be optimally utilized.

       configuration file.  See the section above.


       start symbolic link.

       kill symbolic link.

       daemon log file.

       intctl(1M), ioscan(1M), rc(1M), limits(5).


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