sn - NUMA Memory Management Configuration Tool
The current NUMA configuration parameters are set according to
specifications and/or displayed for the given node-path or all nodes in
-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.
Turn BTE (Block Transfer Engine) on/off for dynamic migration.
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
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.
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.
Turn the memory reference counter unpegger on/off.
Set the pegged level to threshold. This threshold is a percentage of
the maximum count a memory reference counter can hold.
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.
Enable or disable migration dampening.
Set the migration dampening factor. This factor is a percentage of
the maximum possible dampening factor (4 for Origin 2000 systems).
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.
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
Only the superuser or users with the MEMORY_MGT capability are allowed to
use this command to change numa parameters.
numa(5), refcnt(5), gr_sn(1), nstats(1), gr_nstats(1), linkstat(1),
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