[linux.git] / Documentation / numastat.txt


Numa policy hit/miss statistics

/sys/devices/system/node/node*/numastat

All units are pages. Hugepages have separate counters.

numa_hit			A process wanted to allocate memory from this node,
					and succeeded.
numa_miss			A process wanted to allocate memory from another node,
					but ended up with memory from this node.
numa_foreign		A process wanted to allocate on this node,
				    but ended up with memory from another one.
local_node			A process ran on this node and got memory from it.
other_node			A process ran on this node and got memory from another node.
interleave_hit 		Interleaving wanted to allocate from this node
					and succeeded.

For easier reading you can use the numastat utility from the numactl package
(ftp://ftp.suse.com/pub/people/ak/numa/numactl*). Note that it only works
well right now on machines with a small number of CPUs.
Commit	Line	Data
1da177e4 LT	1
	2	Numa policy hit/miss statistics
	3
	4	/sys/devices/system/node/node*/numastat
	5
	6	All units are pages. Hugepages have separate counters.
	7
	8	numa_hit A process wanted to allocate memory from this node,
	9	and succeeded.
5d3bc270 MK	10	numa_miss A process wanted to allocate memory from another node,
	11	but ended up with memory from this node.
	12	numa_foreign A process wanted to allocate on this node,
	13	but ended up with memory from another one.
1da177e4 LT	14	local_node A process ran on this node and got memory from it.
	15	other_node A process ran on this node and got memory from another node.
	16	interleave_hit Interleaving wanted to allocate from this node
	17	and succeeded.
	18
	19	For easier reading you can use the numastat utility from the numactl package
	20	(ftp://ftp.suse.com/pub/people/ak/numa/numactl*). Note that it only works
	21	well right now on machines with a small number of CPUs.
	22