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lgrpinfo(1)
lgrpinfo(1) User Commands lgrpinfo(1)
NAME
lgrpinfo - display information about locality groups
SYNOPSIS
lgrpinfo [-aceGlLmrt] [-u unit] [-C | -P] lgrp ...
lgrpinfo -h
lgrpinfo -I [-c] [-G] [-C | -P] lgrp ...
lgrpinfo [-T] [-aceGlLmr] [-u unit]
lgrpinfo -d device_path
DESCRIPTION
lgrpinfo prints information about the locality group (lgroup) hierarchy
and its contents.
An lgroup represents the set of CPU and memory-like hardware devices
that are at most some distance (latency) apart from each other. All
lgroups in the system are identified by a unique integer called an
lgroup ID.
lgroups are organized into a hierarchy to facilitate finding the near‐
est resources. Leaf lgroups each contain a set of resources that are
closest (local) to each other. Each parent lgroup in the hierarchy con‐
tains the resources of its child lgroups plus their next nearest re‐
sources. Finally, the root lgroup contains all the resources in the
domain within the largest latency.
A Uniform Memory Access (UMA) machine is simply represented by the root
lgroup. A Non Uniform Memory Access (NUMA) machine is represented by a
hierarchy of lgroups to show the corresponding levels of locality. For
example, a NUMA machine with two latencies (local and remote) has an
lgroup hierarchy consisting of two levels with its leaves and the root.
Every application thread is assigned a home lgroup. When the system
needs to allocate a CPU or memory resource for a thread, it searches
lgroup hierarchy from the thread's home lgroup for the closest avail‐
able resources to the thread's home. See plgrp(1) for details.
Without arguments, lgrpinfo prints general information about all
lgroups in the system. If any lgroup IDs are specified on the command
line, the command only prints information about the specified lgroups.
Various options control which lgroups are displayed and the exact in‐
formation that is printed for each lgroup.
lgroups can be specified on the command line as lgroup IDs or by using
specific keywords. See OPERANDS.
OPTIONS
You can combine options together and the order in which options are
specified is not important. Lowercase options select what information
should be printed about lgroups.
Invoking lgrpinfo without arguments is equivalent to:
lgrpinfo -c -e -l -m -r -t all
The following options are supported:
-a Print topology, CPU, memory, load and latency infor‐
mation.
This option is a shorthand for
lgrpinfo -t -c -e -m -r -l -L
unless -T is specified as well. When -T is specified,
the -t option is not included.
-c Print CPU information.
This is the default.
-C Replace each lgroup in the list with its children.
This option cannot be used with the -P or the -T op‐
tion. When no arguments are specified, this option is
applied to the lgroups displayed by default.
-d device_path Print IDs of lgroups closest to the specified I/O de‐
vice. device_path is a string representing the device
path.
-e Print lgroup load average. The lgroup load averages
are only displayed for leaf lgroups.
This is the default.
-G Print OS view of lgroup hierarchy.
By default, the caller's view of the lgroup hierarchy
is displayed which only includes what the caller can
use, for example, only the CPUs in the caller's
processor set is displayed. See lgrp_init(3LGRP) on
the operating system and the caller's view.
-h Print short help message and exit.
-I Print matching IDs only.
This option is intended for scripts and can be used
with -c, -G, and -C or -P. If -c is specified, print
list of CPUs contained in all matching lgroups. Oth‐
erwise, the IDs for the matching lgroups is dis‐
played. See EXAMPLES.
When no arguments are specified, this option is ap‐
plied to the lgroups displayed, which, by default is
all lgroups.
-l Print information about lgroup latencies.
The latency value specified for each lgroup is de‐
fined by the operating system and is platform-spe‐
cific. It can only be used for relative comparison of
lgroups on the running system. It does not necessar‐
ily represent the actual latency between hardware de‐
vices and might not be applicable across platforms.
-L Print the lgroup latency table. The lgroup latency
table displays the relative latency from each lgroup
to each of the other lgroups including itself.
-m Print memory information.
Memory sizes are scaled to the unit of measure that
yields an integer from 0 to 1023 unless the -u option
is specified as well. The fractional part of the num‐
ber is only displayed for values less than 10. This
behavior is similar to using the -h option of ls(1)
or df(8) to display a human readable format.
This is the default.
-P Replace each lgroup in the list with its parents.
This option cannot be used with the -C or -T option.
When no arguments are specified, this option is ap‐
plied to the lgroups displayed, which, by default is
all lgroups.
-r Print information about lgroup resources.
The resources are represented by a set of lgroups in
which each member lgroup directly contains CPU and
memory resources. If -T is specified as well, only
information about resources of the intermediate
lgroups is displayed.
-t Print information about lgroup topology.
This is the default.
-T Print the lgroup topology of a system graphically as
a tree. This option can only be used with the -a, -c,
-e, -G, -l,-L, -m, -r, and -u options. It only prints
lgroup resources for intermediate lgroups when used
with the -r. The -t option is omitted when -T is used
with -a. No information is printed for the root
lgroup unless it is the only lgroup.
-u units Specify memory units. Units should be b, k, m, g, t,
p, or e for bytes, kilobytes, megabytes, gigabytes,
terabytes, petabytes, or exabytes respectively. The
fractional part of the number is only displayed for
values less than 10. This behavior is similar to us‐
ing the -h option of ls(1) or df(8) to display a hu‐
man readable format.
OPERANDS
The following operands are supported:
lgrp lgroups can be specified on the command line as lgroup ID, by
using one of the following keywords:
all All lgroups.
This is the default.
intermediate All intermediate lgroups. An intermediate
lgroup is an lgroup that has a parent and chil‐
dren.
leaves All leaf lgroups. A leaf lgroup is an lgroup
that has no children in the lgroup hierarchy.
root Root lgroup. Root lgroup contains all the re‐
sources in the domain within the largest la‐
tency and has no parent lgroup.
If an invalid lgroup is specified, the lgrpinfo command prints a mes‐
sage on standard error showing the invalid ID and continues processing
other lgroups specified on the command line. When none of the specified
lgroups are valid, lgrpinfo exits with an exit status of 2.
EXAMPLES
Example 1 Printing Information about lgroups
The following example prints general information about lgroups in the
system.
In this example, the system is a 2 CPU AMD Opteron machine with two
nodes, each having one CPU and 2 gigabytes of memory. Each of these
nodes is represented by a leaf lgroup. The root lgroup contains all the
resources in the machine:
$ lgrpinfo
lgroup 0 (root):
Children: 1 2
CPUs: 0 1
Memory: installed 4.0G, allocated 2.2G, free 1.8G
Lgroup resources: 1 2 (CPU); 1 2 (memory)
Latency: 83
lgroup 1 (leaf):
Children: none, Parent: 0
CPU: 0
Memory: installed 2.0G, allocated 1.2G, free 788M
Lgroup resources: 1 (CPU); 1 (memory)
Load: 0.793
Latency: 56
lgroup 2 (leaf):
Children: none, Parent: 0
CPU: 1
Memory: installed 2.0G, allocated 1017M, free 1.0G
Lgroup resources: 2 (CPU); 2 (memory)
Load: 0.817
Latency: 56
Example 2 Printing lgroup Topology
The following example prints the lgroup topology tree on a 4 CPU AMD
Opteron machine:
$ lgrpinfo -T
0
|-- 5
| `-- 1
|-- 6
| `-- 2
|-- 7
| `-- 3
`-- 8
`-- 4
Example 3 Printing lgroup Topology
The following example prints the lgroup topology tree, resources, mem‐
ory and CPU information on a 2 CPU AMD Opteron machine:
$ lgrpinfo -Ta
0
|-- 1
| CPU: 0
| Memory: installed 2.0G, allocated 1.2G, free 790M
| Load: 0.274
| Latency: 56
`-- 2
CPU: 1
Memory: installed 2.0G, allocated 1019M, free 1.0G
Load: 0.937
Latency: 56
Lgroup latencies:
------------
| 0 1 2
------------
0 | 83 83 83
1 | 83 56 83
2 | 83 83 56
------------
Example 4 Printing lgroup IDs
The following example prints lgroup IDs for children of the root
lgroup:
$ lgrpinfo -I -C root
1 2
Example 5 Printing CPU IDs
The following example prints CPU IDs for all CPUs in lgroup 1:
$ lgrpinfo -c -I 1
0
Example 6 Printing Information about lgroup Latencies
The following example prints information about lgroup latencies:
$ lgrpinfo -l
lgroup 0 (root):
Latency: 83
lgroup 1 (leaf):
Latency: 56
lgroup 2 (leaf):
Latency: 5
Example 7 Printing IDs of lgroups Closest to a Given Device
The following example demonstrates that lgroups 2 and 6 are closest to
the given device:
$ lgrpinfo -d /dev/dsk/c9t0d0s0
lgroup IDs : 2 6
EXIT STATUS
The following exit values are returned:
0 Successful completion.
1 Unable to get lgroup information from the system.
2 All lgroups or the device_path specified are invalid.
3 Invalid syntax.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ Availabilitysystem/core-os _ Interface StabilitySee be‐
low.
The human readable output is Uncommitted.
SEE ALSO
ls(1), plgrp(1), pmap(1), proc(1), ps(1), lgrp_cpus(3LGRP),
lgrp_init(3LGRP), lgrp_resources(3LGRP), liblgrp(3LIB), proc(5), at‐
tributes(7), df(8), prstat(8)
Oracle Solaris 11.4 15 Apr 2019 lgrpinfo(1)