path: root/usr/src/man/man1/lgrpinfo.1

'\" te
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.TH LGRPINFO 1 "April 9, 2016"
.SH NAME
lgrpinfo \- display information about locality groups
.SH SYNOPSIS
.LP
.nf
\fBlgrpinfo\fR [\fB-aceGlLmrt\fR] [\fB-u \fR\fIunit\fR] [\fB-C\fR | \fB-P\fR] \fIlgrp\fR ...
.fi

.LP
.nf
\fBlgrpinfo\fR \fB-h\fR
.fi

.LP
.nf
\fBlgrpinfo\fR \fB-I\fR [\fB-c\fR] [\fB-G\fR] [\fB-C\fR | \fB-P\fR] \fIlgrp\fR ...
.fi

.LP
.nf
\fBlgrpinfo\fR [\fB-T\fR] [\fB-aceGlLmr\fR] [\fB-u \fR\fIunit\fR]
.fi

.SH DESCRIPTION
.LP
\fBlgrpinfo\fR prints information about the locality group (\fBlgroup\fR)
hierarchy and its contents.
.sp
.LP
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 \fBlgroup ID\fR.
.sp
.LP
lgroups are organized into a hierarchy to facilitate finding the nearest
resources. Leaf lgroups each contain a set of resources that are closest
(local) to each other. Each parent lgroup in the hierarchy contains the
resources of its child lgroups plus their next nearest resources. Finally, the
\fBroot\fR lgroup contains all the resources in the domain within the largest
latency.
.sp
.LP
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 \fBlgroup\fR hierarchy
consisting of two levels with its leaves and the root.
.sp
.LP
Every application thread is assigned a \fBhome\fR 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 available resources to the
thread's home. See \fBplgrp\fR(1) for details.
.sp
.LP
Without arguments, \fBlgrpinfo\fR 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 information that is printed for each
lgroup.
.sp
.LP
lgroups can be specified on the command line as lgroup IDs or by using specific
keywords. See \fBOPERANDS\fR.
.SH OPTIONS
.LP
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.
.sp
.LP
Invoking \fBlgrpinfo\fR without arguments is equivalent to:
.sp
.in +2
.nf
lgrpinfo -c -e -l -m -r -t all
.fi
.in -2
.sp

.sp
.LP
The following options are supported:
.sp
.ne 2
.na
\fB\fB-a\fR\fR
.ad
.RS 12n
Print topology, CPU, memory, load and latency information.
.sp
This option is a shorthand for
.sp
.in +2
.nf
lgrpinfo -t -c -e -m -r -l -L
.fi
.in -2
.sp

unless \fB-T\fR is specified as well. When \fB-T\fR is specified, the \fB-t\fR
option is not included.
.RE

.sp
.ne 2
.na
\fB\fB-c\fR\fR
.ad
.RS 12n
Print CPU information.
.sp
This is the default.
.RE

.sp
.ne 2
.na
\fB\fB-C\fR\fR
.ad
.RS 12n
Replace each lgroup in the list with its children.
.sp
This option cannot be used with the \fB-P\fR or the \fB-T\fR option. When no
arguments are specified, this option is applied to the lgroups displayed by
default.
.RE

.sp
.ne 2
.na
\fB\fB-e\fR\fR
.ad
.RS 12n
Print lgroup load average. The lgroup load averages are only displayed for leaf
lgroups.
.sp
This is the default.
.RE

.sp
.ne 2
.na
\fB\fB-G\fR\fR
.ad
.RS 12n
Print OS view of lgroup hierarchy.
.sp
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 \fBlgrp_init\fR(3LGRP) on the operating system
and the caller's view.
.RE

.sp
.ne 2
.na
\fB\fB-h\fR\fR
.ad
.RS 12n
Print short help message and exit.
.RE

.sp
.ne 2
.na
\fB\fB-I\fR\fR
.ad
.RS 12n
Print matching IDs only.
.sp
This option is intended for scripts and can be used with \fB-c\fR, \fB-G\fR,
and \fB-C\fR or \fB-P\fR. If \fB-c\fR is specified, print list of CPUs
contained in all matching lgroups. Otherwise, the IDs for the matching lgroups
is displayed. See \fBEXAMPLES\fR.
.sp
When no arguments are specified, this option is applied to the lgroups
displayed, which, by default is all lgroups.
.RE

.sp
.ne 2
.na
\fB\fB-l\fR\fR
.ad
.RS 12n
Print information about lgroup latencies.
.sp
The latency value specified for each lgroup is defined by the operating system
and is platform-specific. It can only be used for relative comparison of
lgroups on the running system. It does not necessarily represent the actual
latency between hardware devices and might not be applicable across platforms.
.RE

.sp
.ne 2
.na
\fB\fB-L\fR\fR
.ad
.RS 12n
Print the lgroup latency table. The lgroup latency table displays the relative
latency from each lgroup to each of the other lgroups including itself.
.RE

.sp
.ne 2
.na
\fB\fB-m\fR\fR
.ad
.RS 12n
Print memory information.
.sp
Memory sizes are scaled to the unit of measure that yields an integer from
\fB0\fR to \fB1023\fR unless the \fB-u\fR option is specified as well. The
fractional part of the number is only displayed for values less than \fB10\fR.
This behavior is similar to using the \fB-h\fR option of \fBls\fR(1) or
\fBdf\fR(8) to display a human readable format.
.sp
This is the default.
.RE

.sp
.ne 2
.na
\fB\fB-P\fR\fR
.ad
.RS 12n
Replace each lgroup in the list with its parents.
.sp
This option cannot be used with the \fB-C\fR or \fB-T\fR option. When no
arguments are specified, this option is applied to the lgroups displayed,
which, by default is all lgroups.
.RE

.sp
.ne 2
.na
\fB\fB-r\fR\fR
.ad
.RS 12n
Print information about lgroup resources.
.sp
The resources are represented by a set of lgroups in which each member lgroup
directly contains CPU and memory resources. If \fB-T\fR is specified as well,
only information about resources of the intermediate lgroups is displayed.
.RE

.sp
.ne 2
.na
\fB\fB-t\fR\fR
.ad
.RS 12n
Print information about lgroup topology.
.sp
This is the default.
.RE

.sp
.ne 2
.na
\fB\fB-T\fR\fR
.ad
.RS 12n
Print the lgroup topology of a system graphically as a tree. This option can
only be used with the \fB-a\fR, \fB-c\fR, \fB-e\fR, \fB-G\fR,
\fB-l\fR,\fB-L\fR, \fB-m\fR, \fB-r\fR, and \fB-u\fR options. It only prints
lgroup resources for intermediate lgroups when used with the \fB-r\fR. The
\fB-t\fR option is omitted when \fB-T\fR is used with \fB-a\fR. No information
is printed for the \fBroot\fR lgroup unless it is the only lgroup.
.RE

.sp
.ne 2
.na
\fB\fB-u\fR \fIunits\fR\fR
.ad
.RS 12n
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 using the \fB-h\fR option of
\fBls\fR(1) or \fBdf\fR(8) to display a human readable format.
.RE

.SH OPERANDS
.LP
The following operands are supported:
.sp
.ne 2
.na
\fB\fIlgrp\fR\fR
.ad
.RS 8n
lgroups can be specified on the command line as lgroup ID, by using one of the
following keywords:
.sp
.ne 2
.na
\fBall\fR
.ad
.RS 16n
All lgroups.
.sp
This is the default.
.RE

.sp
.ne 2
.na
\fBintermediate\fR
.ad
.RS 16n
All intermediate lgroups. An intermediate lgroup is an lgroup that has a parent
and children.
.RE

.sp
.ne 2
.na
\fBleaves\fR
.ad
.RS 16n
All leaf lgroups. A leaf lgroup is an lgroup that has no children in the lgroup
hierarchy.
.RE

.sp
.ne 2
.na
\fBroot\fR
.ad
.RS 16n
Root lgroup. Root lgroup contains all the resources in the domain within the
largest latency and has no parent lgroup.
.RE

.RE

.sp
.LP
If an invalid lgroup is specified, the lgrpinfo command prints a message 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,
\fBlgrpinfo\fR exits with an exit status of \fB2\fR.
.SH EXAMPLES
.LP
\fBExample 1 \fRPrinting Information about lgroups
.sp
.LP
The following example prints general information about lgroups in the system.

.sp
.LP
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:

.sp
.in +2
.nf
$ 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
.fi
.in -2
.sp

.LP
\fBExample 2 \fRPrinting lgroup Topology
.sp
.LP
The following example prints the lgroup topology tree on a 4 CPU AMD Opteron
machine:

.sp
.in +2
.nf
$ lgrpinfo -T
  0
  |-- 5
  |   `-- 1
  |-- 6
  |   `-- 2
  |-- 7
  |   `-- 3
  `-- 8
      `-- 4
.fi
.in -2
.sp

.LP
\fBExample 3 \fRPrinting lgroup Topology
.sp
.LP
The following example prints the lgroup topology tree, resources, memory and
CPU information on a 2 CPU AMD Opteron machine:

.sp
.in +2
.nf
$ 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
  ------------
.fi
.in -2
.sp

.LP
\fBExample 4 \fRPrinting lgroup IDs
.sp
.LP
The following example prints lgroup IDs for children of the root lgroup:

.sp
.in +2
.nf
$ lgrpinfo -I -C root
  1 2
.fi
.in -2
.sp

.LP
\fBExample 5 \fRPrinting CPU IDs
.sp
.LP
The following example prints CPU IDs for all CPUs in lgroup 1:

.sp
.in +2
.nf
$ lgrpinfo -c -I 1
  0
.fi
.in -2
.sp

.LP
\fBExample 6 \fRPrinting Information about lgroup Latencies
.sp
.LP
The following example prints information about lgroup latencies:

.sp
.in +2
.nf
 $ lgrpinfo -l
  lgroup 0 (root):
          Latency: 83
  lgroup 1 (leaf):
          Latency: 56
  lgroup 2 (leaf):
          Latency: 5
.fi
.in -2
.sp

.SH EXIT STATUS
.LP
The following exit values are returned:
.sp
.ne 2
.na
\fB\fB0\fR\fR
.ad
.RS 5n
Successful completion.
.RE

.sp
.ne 2
.na
\fB\fB1\fR\fR
.ad
.RS 5n
Unable to get lgroup information from the system.
.RE

.sp
.ne 2
.na
\fB\fB2\fR\fR
.ad
.RS 5n
All lgroups specified are invalid.
.RE

.sp
.ne 2
.na
\fB\fB3\fR\fR
.ad
.RS 5n
Invalid syntax.
.RE

.SH ATTRIBUTES
.LP
See \fBattributes\fR(7) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Interface Stability	See below.
.TE

.sp
.LP
The human readable output is Unstable.
.SH SEE ALSO
.LP
.BR ls (1),
.BR plgrp (1),
.BR pmap (1),
.BR proc (1),
.BR ps (1),
.BR lgrp_init (3LGRP),
.BR liblgrp (3LIB),
.BR proc (5),
.BR attributes (7),
.BR df (8),
.BR prstat (8)