nstats(1) nstats(1)
nstats - NUMA Memory Management Statistics
nstats [node-path] [-hav] [-r command]
Display the absolute NUMA Memory Management statistics, or display the
relative NUMA Memory Management statistics after running a command.
-h Print a small summary of usage.
-a Print absolute statistics for all nodes in the system.
-r Run the command specified by command and display the relative
statistics at the end of the command. Nstats samples the absolute
statistics before running the command and after running the command.
When the command exits, nstats displays the difference between the
two samples.
Migration Threshold
Current migration threshold for this node expressed as a percentage
of the maximum threshold supported by the memory reference counters.
This maximum threshold is shown by the sn(1) command, and it can be
set by the system administrator to be either 2047 or 524287. Only
machines with PREMIUMM directory memory support the higher value of
524287. The migration threshold determines how aggressively the
system is trying to migrate memory to the nodes that are issuing
most memory accesses to a page of memory. Migration is requested
when the difference between the number of local accesses and the
number of remote accesses exceeds the number defined by the
migration threshold.
Counter Interrupts [Toc] [Back]
This is the number of interrupts generated by the memory reference
counters, including interrupts for migration and interrupts for
updating the extended memory reference counters (refcnt(5)).
Auto Migrations To Node
Number of pages automatically migrated to a node.
Auto Migrations From Node [Toc] [Back]
Number of pages automatically migrated out of a node.
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Auto Migration Skips [Toc] [Back]
Rejected automatic migration requests due to a page being frozen or
not in a migratable state.
User Migrations To Node
Number of pages migrated to a node due to an explicit user migration
request.
User Migrations From Node [Toc] [Back]
Number of pages migrated out of a node due to an explicit user
migration request.
User Migration Skips [Toc] [Back]
Rejected user migration requests due to a page being frozen or not
in a migratable state.
CoalD Migrations To Node [Toc] [Back]
Number of pages migrated to a node due large page coalescing.
CoalD Migrations From Node [Toc] [Back]
Number of pages migrated from a node due to large page coalescing.
CoalD Migration Skips [Toc] [Back]
Rejected large page coalescing migration requests due to a page
being frozen or not in a migratable state.
Frozen Pages In Node [Toc] [Back]
Pages frozen due to excessive migration.
Melted Pages In Node [Toc] [Back]
Pages melted (unfrozen) after having been frozen for a period of
time.
To display the NUMA statistics for all nodes
$ nstats -a
To run a command and display NUMA statistics at the end
$ nstats -r ls -l
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RESTRICTIONS
All statistics are global.
numa(5), refcnt(5), gr_sn(1), sn(1), gr_nstats(1), linkstat(1),
xbstat(1m), hwgraph(4).
PPPPaaaaggggeeee 3333 [ Back ]
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