SN(1)									 SN(1)

NAME    [Toc]    [Back]

     sn	- NUMA Memory Management Configuration Tool

SYNOPSIS    [Toc]    [Back]

     sn	[-vsah]
	[-b on|off]
	[-m on|off|fon|foff]
	[-t threshold]
	[-z distance]
	[-u on|off]
	[-p threshold]
	[-w interval]
	[-i on|off]
	[-f factor]
	[-r on|off|fon|foff]
	[node-path]

DESCRIPTION    [Toc]    [Back]

     The current NUMA configuration parameters are set according to
     specifications and/or  displayed for the given node-path or all nodes in
     the system.

OPTIONS    [Toc]    [Back]

     -v	  Show all configuration parameters.

     -s	  Silent operation. Just set specified parameters.

     -a	  Apply	requested operation to all nodes in the	system.

     -h	  Print	brief usage summary.

     -b	on|off
	  Turn BTE (Block Transfer Engine) on/off for dynamic migration.

     -m	on|off|fon|foff
	  Set the default dynamic migration mode; on sets the default to
	  migration enabled and	users can override the default on a per
	  address space	basis; off sets	the default to migration off and users
	  can override the default on a	per address space basis; foff
	  completely disables migration	and fon	forces migration to be
	  enabled.

     -t	threshold
	  Set the dynamic migration threshold to threshold. This threshold  is
	  a percentage of the maximum possible difference between a local and
	  a remote memory reference counter.






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     -z	distance
	  Set the cutoff distance for migration	to distance. This is the
	  minimum distance between a source and	a destination node required
	  for migration	to take	place.

     -u	on|off
	  Turn the memory reference counter unpegger on/off.

     -p	threshold
	  Set the pegged level to threshold. This threshold is a percentage of
	  the maximum count a memory reference counter can hold.

     -w	interval
	  Set the unpegger period to interval. This interval is	in seconds and
	  specifies how	often the unpegger should be waken up to check the
	  memory reference counters in every node, and reset those counters
	  that have reached a pegged level.

     -i	on|off
	  Enable or disable migration dampening.

     -f	factor
	  Set the migration dampening factor. This factor is a percentage of
	  the maximum possible dampening factor	(4 for Origin 2000 systems).

     -r	on|off|fon|foff
	  Set the default reference counting mode; on sets the default to
	  enabled and users can	override the default on	a per address space
	  basis; off sets the default to disabled and users can	override the
	  default on a per address space basis;	foff completely	disables
	  reference counting and fon forces reference counting to be enabled.

EXAMPLE    [Toc]    [Back]

     To	turn migration off for all nodes:
	$ sn -a	-m off
     To	turn migration on with a threshold of 34%:
	$ sn -a	-m on -t 34

     To	enable the extended reference counters on all nodes:
	$ sn -a	-r on

RESTRICTIONS    [Toc]    [Back]

     Only the superuser	or users with the MEMORY_MGT capability	are allowed to
     use this command to change	numa parameters.

SEE ALSO    [Toc]    [Back]

     numa(5), refcnt(5), gr_sn(1), nstats(1), gr_nstats(1), linkstat(1),
     xbstat(1m), hwgraph(4).





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