Provided by: hwloc-nox_2.7.0-2ubuntu1_amd64 
NAME
lstopo, lstopo-no-graphics, hwloc-ls - Show the topology of the system
SYNOPSIS
lstopo [ options ]... [ filename ]
lstopo-no-graphics [ options ]... [ filename ]
hwloc-ls [ options ]... [ filename ]
Note that hwloc(7) provides a detailed explanation of the hwloc system; it should be read before reading
this man page
OPTIONS
--of <format>, --output-format <format>
Enforce the output in the given format. See the OUTPUT FORMATS section below.
-i <file>, --input <file>
Read topology from XML file <file> (instead of discovering the topology on the local machine). If
<file> is "-", the standard input is used. XML support must have been compiled in to hwloc for
this option to be usable.
-i <directory>, --input <directory>
Read topology from <directory> instead of discovering the topology of the local machine. On
Linux, the directory may contain the topology files gathered from another machine topology with
hwloc-gather-topology. On x86, the directory may contain a cpuid dump gathered with hwloc-gather-
cpuid.
-i <specification>, --input <specification>
Simulate a fake hierarchy (instead of discovering the topology on the local machine). If
<specification> is "node:2 pu:3", the topology will contain two NUMA nodes with 3 processing units
in each of them. The <specification> string must end with a number of PUs.
--if <format>, --input-format <format>
Enforce the input in the given format, among xml, fsroot, cpuid and synthetic.
--export-xml-flags <flags>
Enforce flags when exporting to the XML format. Flags may be given as numeric values or as a
comma-separated list of flag names that are passed to hwloc_topology_export_xml(). Those names
may be substrings of actual flag names as long as a single one matches. A value of 1 (or v1)
reverts to the format of hwloc v1.x. The default is 0 (or none).
--export-synthetic-flags <flags>
Enforce flags when exporting to the synthetic format. Flags may be given as numeric values or as
a comma-separated list of flag names that are passed to hwloc_topology_export_synthetic(). Those
names may be substrings of actual flag names as long as a single one matches. A value of 2 (or
no_attr) reverts to the format of hwloc v1.9. A value of 3 (or no_ext,no_attr) reverts to the
original minimalistic format (before v1.9). The default is 0 (or none).
-v --verbose
Include additional detail. The hwloc-info tool may be used to display even more information about
specific objects.
-s --silent
Reduce the amount of details to show.
--distances
Only display distance matrices.
--distances-transform <links|merge-switch-ports|transitive-closure>
Try applying a transformation to distances structures before displaying them. See
hwloc_distances_transform() for details. More transformations may be applied using hwloc-
annotate(1) (and it may save their output to XML).
--memattrs
Only display memory attributes. All of them are displayed (while the default textual output
selects memory attribute details depending on the verbosity level).
--cpukinds
Only display CPU kinds. CPU kinds are displayed in order, starting from the most energy efficient
ones up to the rather higher performance and power hungry ones.
--windows-processor-groups
On Windows, only show information about processor groups. All of them are displayed, while the
default verbose output only shows them if there are more than one.
-f --force
If the destination file already exists, overwrite it.
-l --logical
Display hwloc logical indexes of all objects, with prefix "L#". By default, both logical and
physical/OS indexes are displayed for PUs and NUMA nodes, logical only for cores, dies and
packages, and no index for other types.
-p --physical
Display OS/physical indexes of all objects, with prefix "P#". By default, both logical and
physical/OS indexes are displayed for PUs and NUMA nodes, logical only for cores, dies and
packages, and no index for other types.
-c --cpuset
Display the cpuset of each object.
-C --cpuset-only
Only display the cpuset of each object; do not display anything else about the object.
--taskset
Show CPU set strings in the format recognized by the taskset command-line program instead of
hwloc-specific CPU set string format. This option should be combined with --cpuset or
--cpuset-only, otherwise it will imply --cpuset.
--only <type>
Only show objects of the given type in the textual output.
--filter <type>:<kind>, --filter <type>
Filter objects of type <type>, or of any type if <type> is "all". "io", "cache" and "icache" are
also supported.
<kind> specifies the filtering behavior. If "none" or not specified, all objects of the given
type are removed. If "all", all objects are kept as usual. If "structure", objects are kept when
they bring structure to the topology. If "important" (only applicable to I/O), only important
objects are kept. See hwloc_topology_set_type_filter() for more details.
hwloc supports filtering any type except PUs and NUMA nodes. lstopo also offers PU and NUMA node
filtering by hiding them in the graphical and textual outputs, but any object included in them
(for instance Misc) will be hidden as well. Note that PUs and NUMA nodes may not be ignored in
the XML output. Note also that the top-level object type cannot be ignored (usually Machine or
System).
--ignore <type>
This is the old way to specify --filter <type>:none.
--no-smt
Ignore PUs. This is identical to --filter PU:none.
--no-caches
Do not show caches. This is identical to --filter cache:none.
--no-useless-caches
This is identical to --filter cache:structure.
--no-icaches
This is identical to --filter icache:none.
--disallowed
Include objects disallowed by administrative limitations.
--allow <all|local|0xff|nodeset=0xf0>
Include objects disallowed by administrative limitations (implies --disallowed) and also change
the set of allowed ones.
If local is given, only objects available to the current process are allowed (default behavior
when loading from the native operating system backend). It may be useful if the topology was
created by another process (with different administrative restrictions such as Linux Cgroups) and
loaded here loaded from XML or synthetic. This case implies --thissystem.
If all, all objects are allowed.
If a bitmap is given as a hexadecimal string, it is used as the set of allowed PUs.
If a bitmap is given after prefix nodeset=, it is the set of allowed NUMA nodes.
--flags <flags>
Enforce topology flags. Flags may be given as numeric values or as a comma-separated list of flag
names that are passed to hwloc_topology_set_flags(). Those names may be substrings of actual flag
names as long as a single one matches, for instance disallowed,thissystem_allowed. The default is
8 (or import).
--merge
Do not show levels that do not have a hierarchical impact. This sets
HWLOC_TYPE_FILTER_KEEP_STRUCTURE for all object types. This is identical to --filter
all:structure.
--no-factorize --no-factorize=<type>
Never factorize identical objects in the graphical output.
If an object type is given, only factorizing of these objects is disabled. This only applies to
normal CPU-side objects, it is independent from PCI collapsing.
--factorize --factorize=[<type>,]<N>[,<L>[,<F>]
Factorize identical children in the graphical output (enabled by default).
If <N> is specified (4 by default), factorizing only occurs when there are strictly more than N
identical children. If <L> and <F> are specified, they set the numbers of first and last children
to keep after factorizing.
If an object type is given, only factorizing of these objects is configured. This only applies to
normal CPU-side object, it is independent from PCI collapsing.
--no-collapse
Do not collapse identical PCI devices. By default, identical sibling PCI devices (such as many
virtual functions inside a single physical device) are collapsed.
--no-cpukinds
Do not show different kinds of CPUs in the graphical output. By default, when supported,
different types of lines, thickness and bold font may be used to display PU boxes of different
kinds.
--restrict <cpuset>
Restrict the topology to the given cpuset.
--restrict nodeset=<nodeset>
Restrict the topology to the given nodeset, unless --restrict-flags specifies something different.
--restrict binding
Restrict the topology to the current process binding. This option requires the use of the actual
current machine topology (or any other topology with --thissystem or with HWLOC_THISSYSTEM set to
1 in the environment).
--restrict-flags <flags>
Enforce flags when restricting the topology. Flags may be given as numeric values or as a comma-
separated list of flag names that are passed to hwloc_topology_restrict(). Those names may be
substrings of actual flag names as long as a single one matches, for instance bynodeset,memless.
The default is 0 (or none).
--no-io
Do not show any I/O device or bridge. This is identical to --filter io:none. By default, common
devices (GPUs, NICs, block devices, ...) and interesting bridges/switches are shown.
--no-bridges
Do not show any I/O bridge except hostbridges. This is identical to --filter bridge:none. By
default, common devices (GPUs, NICs, block devices, ...) and interesting bridges/switches are
shown.
--whole-io
Show all I/O devices and bridges. This is identical to --filter io:all. By default, only common
devices (GPUs, NICs, block devices, ...) and interesting bridges/switches are shown.
--thissystem
Assume that the selected backend provides the topology for the system on which we are running.
This is useful when loading a custom topology such as an XML file and using --restrict binding or
--allow all.
--pid <pid>
Detect topology as seen by process <pid>, i.e. as if process <pid> did the discovery itself. Note
that this can for instance change the set of allowed processors. Also show this process current
CPU and Memory binding by marking the corresponding PUs and NUMA nodes (in Green in the graphical
output, see the COLORS section below, or by appending (binding) to the verbose text output). If 0
is given as pid, the current binding for the lstopo process will be shown.
--ps --top
Show existing processes as misc objects in the output. To avoid uselessly cluttering the output,
only processes that are restricted to some part of the machine are shown. On Linux, kernel
threads are not shown. If many processes appear, the output may become hard to read anyway,
making the hwloc-ps program more practical.
--children-order <order>
Change the order of the different kinds of children with respect to their parent in the graphical
output. <order> may be a comma-separated list of keywords among:
memory:above displays memory children above other children (and above the parent if it is a
cache). PUs are therefore below their local NUMA nodes, like hwloc 1.x did.
io:right and misc:right place I/O or Misc children on the right of CPU children.
io:below and misc:below place I/O or Misc children below CPU children.
plain places everything not specified together with normal CPU children.
If only plain is specified, lstopo displays the topology in a basic manner that strictly matches
the actual tree: Memory, I/O and Misc children are listed below their parent just like any other
child. PUs are therefore on the side of their local NUMA nodes, below a common ancestor. This
output may result in strange layouts since the size of Memory, CPU and I/O children may be very
different, causing the placement algorithm to poorly arrange them in rows.
The default order is memory:above,io:right,misc:right which means Memory children are above CPU
children while I/O and Misc are together on the right.
Up to hwloc 2.5, the default was rather to memory:above,plain.
Additionally, io:right, io:below, misc:right and misc:below may be suffixed with :horiz, :vert or
:rect to force the horizontal, vertical or rectangular layout of children inside these sections.
See also the GRAPHICAL OUTPUT and LAYOUT sections below.
--fontsize <size>
Set the size of text font in the graphical output.
The default is 10.
Boxes are scaled according to the text size. The LSTOPO_TEXT_XSCALE environment variable may be
used to further scale the width of boxes (its default value is 1.0).
The --fontsize option is ignored in the ASCII backend.
--gridsize <size>
Set the margin between elements in the graphical output.
The default is 7. It was 10 prior to hwloc 2.1.
This option is ignored in the ASCII backend.
--linespacing <size>
Set the spacing between lines of text in the graphical output.
The default is 4.
The option was included in --gridsize prior to hwloc 2.1 (and its default was 10).
This option is ignored in the ASCII backend.
--thickness <size>
Set the thickness of lines and boxes in the graphical output.
The default is 1.
This option is ignored in the ASCII backend.
--horiz, --horiz=<type1,...>
Force a horizontal graphical layout instead of nearly 4/3 ratio in the graphical output. If a
comma-separated list of object types is given, the layout only applies to the corresponding
container objects. Ignored for bridges since their children are always vertically aligned.
--vert, --vert=<type1,...>
Force a vertical graphical layout instead of nearly 4/3 ratio in the graphical output. If a
comma-separated list of object types is given, the layout only applies to the corresponding
container objects.
--rect, --rect=<type1,...>
Force a rectangular graphical layout with nearly 4/3 ratio in the graphical output. If a comma-
separated list of object types is given, the layout only applies to the corresponding container
objects. Ignored for bridges since their children are always vertically aligned.
--no-text, --no-text=<type1,...>
Do not display any text in boxes in the graphical output. If a comma-separated list of object
types is given, text is disabled for the corresponding objects. This is mostly useful for
removing text from Group objects.
--text, --text=<type1,...>
Display text in boxes in the graphical output (default). If a comma-separated list of object
types is given, text is reenabled for the corresponding objects (if it was previously disabled
with --no-text).
--no-index, --no-index=<type1,...>
Do not show object indexes in the graphical output. If a comma-separated list of object types is
given, indexes are disabled for the corresponding objects.
--index, --index=<type1,...>
Show object indexes in the graphical output (default). If a comma-separated list of object types
is given, indexes are reenabled for the corresponding objects (if they were previously disabled
with --no-index).
--no-attrs, --no-attrs=<type1,...>
Do not show object attributes (such as memory size, cache size, PCI bus ID, PCI link speed, etc.)
in the graphical output. If a comma-separated list of object types is given, attributes are
disabled for the corresponding objects.
--attrs, --attrs=<type1,...>
Show object attributes (such as memory size, cache size, PCI bus ID, PCI link speed, etc.) in the
graphical output (default). If a comma-separated list of object types is given, attributes are
reenabled for the corresponding objects (if they were previously disabled with --no-attrs).
--no-legend
Remove all text legend lines at the bottom of the graphical output.
--no-default-legend
Remove default text legend lines at the bottom of the graphical output. User-added legend lines
with --append-legend or the "lstopoLegend" info are still displayed if any.
--append-legend <line>
Append the line of text to the bottom of the legend in the graphical output. If adding multiple
lines, each line should be given separately by passing this option multiple times. Additional
legend lines may also be specified inside the topology using the "lstopoLegend" info attributes on
the topology root object.
--grey, --greyscale
Use greyscale instead of colors in the graphical output.
--palette <grey|greyscale|defaut|colors|white|none>
Change the color palette. Passing grey or greyscale is identical to passing --grey or
--greyscale. Passing white or none uses white instead of colors for all box backgrounds. Passing
default or colors reverts back to the default color palette.
--palette type=#rrggbb
Replace the color of the given box type with the given 3x8bit hexadecimal RGB combination (e.g.
#ff0000 is red). Existing types are machine, group, package, group_in_package, die, core, pu,
numanode, memories (box containing multiple memory children), cache, pcidev, osdev, bridge, and
misc.
See also CUSTOM COLOR below for customizing individual objects.
--binding-color <none|#rrggbb>
Do not colorize PUs and NUMA nodes according to the binding in the graphical output. Or change
the color to the given 3x8bit hexadecimal RGB combination (e.g. #ff0000 is red).
--disallowed-color <none|#rrggbb>
Do not colorize disallowed PUs and NUMA nodes in the graphical output. Or change the color to the
given 3x8bit hexadecimal RGB combination (e.g. #00ff00 is green).
--top-color <none|#rrggbb>
Do not colorize task objects in the graphical output when --top is given. Or change the color to
the given 3x8bit hexadecimal RGB combination (e.g. #0000ff is blue).
--version
Report version and exit.
-h --help
Display help message and exit.
DESCRIPTION
lstopo and lstopo-no-graphics are capable of displaying a topological map of the system in a variety of
different output formats. The only difference between lstopo and lstopo-no-graphics is that graphical
outputs are only supported by lstopo, to reduce dependencies on external libraries. hwloc-ls is
identical to lstopo-no-graphics.
The filename specified directly implies the output format that will be used; see the OUTPUT FORMATS
section, below. Output formats that support color will indicate specific characteristics about
individual CPUs by their color; see the COLORS section, below.
OUTPUT FORMATS
By default, if no output filename is specific, the output is sent to a graphical window if possible in
the current environment (DISPLAY environment variable set on Unix, etc.). Otherwise, a text summary is
displayed in the console.
The filename on the command line usually determines the format of the output. There are a few filenames
that indicate specific output formats and devices (e.g., a filename of "-" will output a text summary to
stdout), but most filenames indicate the desired output format by their suffix (e.g., "topo.png" will
output a PNG-format file).
The format of the output may also be changed with "--of". For instance, "--of pdf" will generate a PDF-
format file on the standard output, while "--of fig toto" will output a Xfig-format file named "toto".
The list of currently supported formats is given below. Any of them may be used with "--of" or as a
filename suffix.
default
Send the output to a window or to the console depending on the environment.
console
Send a text summary to stdout. Binding or unallowed processors are only annotated in this mode if
verbose; see the COLORS section, below.
ascii Output an ASCII art representation of the map (formerly called txt). If outputting to stdout and
if colors are supported on the terminal, the output will be colorized.
tikz or tex
Output a LaTeX tikzpicture representation of the map that can be compiled with a LaTeX compiler.
fig Output a representation of the map that can be loaded in Xfig.
svg Output a SVG representation of the map, using Cairo (by default, if supported) or a native SVG
backend (fallback, always supported). See cairosvg and nativesvg below.
cairosvg or svg(cairo)
If lstopo was compiled with the proper support, output a SVG representation of the map using
Cairo.
nativesvg or svg(native)
Output a SVG representation of the map using the native SVG backend. It may be less pretty than
the Cairo output, but it is always supported, and SVG objects have attributes for identifying and
manipulating them. See dynamic_SVG_example.html for an example.
pdf If lstopo was compiled with the proper support, lstopo outputs a PDF representation of the map.
ps If lstopo was compiled with the proper support, lstopo outputs a Postscript representation of the
map.
png If lstopo was compiled with the proper support, lstopo outputs a PNG representation of the map.
synthetic
If the topology is symmetric (which requires that the root object has its symmetric_subtree field
set), lstopo outputs a synthetic description string. This output may be reused as an input
synthetic topology description later. See also the Synthetic topologies section in the
documentation. Note that Misc and I/O devices are ignored during this export.
xml If lstopo was compiled with the proper support, lstopo outputs an XML representation of the map.
It may be reused later, even on another machine, with lstopo --input, the HWLOC_XMLFILE
environment variable, or the hwloc_topology_set_xml() function.
The following special names may be used:
- Send a text summary to stdout.
/dev/stdout
Send a text summary to stdout. It is effectively the same as specifying "-".
-.<format>
If the entire filename is "-.<format>", lstopo behaves as if "--of <format> -" was given, which
means a file of the given format is sent to the standard output.
See the output of "lstopo --help" for a specific list of what graphical output formats are supported in
your hwloc installation.
GRAPHICAL OUTPUT
The graphical output is made of nested boxes representing the inclusion of objects in the hierarchy of
resources. Usually a Machine box contains one or several Package boxes, that contain multiple Core
boxes, with one or several PUs each.
Caches
Caches are displayed in a slightly different manner because they do not actually include computing
resources such as cores. For instance, a L2 Cache shared by a pair of Cores is drawn as a Cache box on
top of two Core boxes (instead of having Core boxes inside the Cache box).
NUMA nodes and Memory-side Caches
By default, NUMA nodes boxes are drawn on top of their local computing resources. For instance, a
processor Package containing one NUMA node and four Cores is displayed as a Package box containing the
NUMA node box above four Core boxes. If a NUMA node is local to the L3 Cache, the NUMA node is displayed
above that Cache box. All this specific drawing strategy for memory objects may be disabled by passing
command-line option --children-order plain.
If multiple NUMA nodes are attached to the same parent object, they are displayed inside an additional
unnamed memory box.
If some Memory-side Caches exist in front of some NUMA nodes, they are drawn as boxes immediately above
them.
PCI bridges, PCI devices and OS devices
The PCI hierarchy is not drawn as a set of included boxes but rather as a tree of bridges (that may
actually be switches) with links between them. The tree starts with a small square on the left for the
hostbridge or root complex. It ends with PCI device boxes on the right. Intermediate PCI
bridges/switches may appear as additional small squares in the middle.
PCI devices on the right of the tree are boxes containing their PCI bus ID (such as 00:02.3). They may
also contain sub-boxes for OS device objects such as a network interface eth0 or a CUDA GPU cuda0.
The datarate of a PCI link may be written (in GB/s) right below its drawn line (if the operating system
and/or libraries are able to report that information). This datarate is the currently configured PCI
datarate. It may change during execution since some devices are able to slow their PCI links down when
idle.
When there is a single link (horizontal line) on the right of a PCI bridge, it means that a single device
or bridge is connected on the secondary PCI bus behind that bridge. When there is a vertical line, it
means that multiple devices and/or bridges are connected to the same secondary PCI bus.
LAYOUT
In its graphical output, lstopo uses simple rectangular heuristics to try to achieve a 4/3 ratio between
width and height. Although the hierarchy of resources is properly reflected, the exact physical
organization (NUMA distances, rings, complete graphs, etc.) is currently ignored.
The layout of a level may be changed with --vert, --horiz, and --rect to force a parent object to arrange
its children in vertical, horizontal or rectangular manners respectively.
The position of Memory, I/O and Misc children with respect to other children objects may be changed using
--children-order. This effectivement divides children into multiple sections. The layout of children is
first computed inside each section, before sections are placed inside (or below) the parent box.
The vertical/horizontal/rectangular layout of these additional sections may also be configured through
--children-order.
COLORS
Individual CPUs and NUMA nodes are colored in the graphical output formats to indicate different
characteristics:
Green The topology is reported as seen by a specific process (see --pid), and the given CPU or NUMA node
is in this process CPU or Memory binding mask.
White The CPU or NUMA node is in the allowed set (see below). If the topology is reported as seen by a
specific process (see --pid), the object is also not in this process binding mask.
Red The CPU or NUMA node is not in the allowed set (see below).
The "allowed set" is the set of CPUs or NUMA nodes to which the current process is allowed to bind. The
allowed set is usually either inherited from the parent process or set by administrative qpolicies on the
system. Linux cpusets are one example of limiting the allowed set for a process and its children to be
less than the full set of CPUs or NUMA nodes on the system.
Different processes may therefore have different CPUs or NUMA nodes in the allowed set. Hence, invoking
lstopo in different contexts and/or as different users may display different colors for the same
individual CPUs (e.g., running lstopo in one context may show a specific CPU as red, but running lstopo
in a different context may show the same CPU as white).
Some lstopo output modes, e.g. the console mode (default non-graphical output), do not support colors at
all. The console mode displays the above characteristics by appending text to each PU line if verbose
messages are enabled.
CUSTOM COLORS
The colors of different kinds of boxes may be configured with --palette.
The color of each object in the graphical output may also be enforced by specifying a "lstopoStyle" info
attribute in that object. Its value should be a semi-colon separated list of "<attribute>=#rrggbb" where
rr, gg and bb are the RGB components of a color, each between 0 and 255, in hexadecimal (00 to ff).
<attribute> may be
Background
Sets the background color of the main object box.
Text Sets the color of the text showing the object name, type, index, etc.
Text2 Sets the color of the additional text near the object, for instance the link speed behind a PCI
bridge.
The "lstopoStyle" info may be added to a temporarily-saved XML topologies with hwloc-annotate, or with
hwloc_obj_add_info(). For instance, to display all core objects in blue (with white names):
lstopo save.xml
hwloc-annotate save.xml save.xml core:all info lstopoStyle "Background=#0000ff;Text=#ffffff"
lstopo -i save.xml
EXAMPLES
To display the machine topology in textual mode:
lstopo-no-graphics
To display the machine topology in ascii-art mode:
lstopo-no-graphics -.ascii
To display in graphical mode (assuming that the DISPLAY environment variable is set to a relevant value):
lstopo
To export the topology to a PNG file:
lstopo file.png
To export an XML file on a machine and later display the corresponding graphical output on another
machine:
machine1$ lstopo file.xml
<transfer file.xml from machine1 to machine2>
machine2$ lstopo --input file.xml
To save the current machine topology to XML and later reload it faster while still considering it as the
current machine:
$ lstopo file.xml
<...>
$ lstopo --input file.xml --thissystem
To restrict an XML topology to only physical processors 0, 1, 4 and 5:
lstopo --input file.xml --restrict 0x33 newfile.xml
To restrict an XML topology to only numa node whose logical index is 1:
lstopo --input file.xml --restrict $(hwloc-calc --input file.xml node:1) newfile.xml
To display a summary of the topology:
lstopo -s
To get more details about the topology:
lstopo -v
To only show cores:
lstopo --only core
To show cpusets:
lstopo --cpuset
To only show the cpusets of package:
lstopo --only package --cpuset-only
Simulate a fake hierarchy; this example shows with 2 NUMA nodes of 2 processor units:
lstopo --input "node:2 2"
To count the number of logical processors in the system
lstopo --only pu | wc -l
To append the kernel release and version to the graphical legend:
lstopo --append-legend "Kernel release: $(uname -r)" --append-legend "Kernel version: $(uname -v)"
SEE ALSO
hwloc(7), hwloc-info(1), hwloc-bind(1), hwloc-annotate(1), hwloc-ps(1), hwloc-gather-topology(1), hwloc-
gather-cpuid(1)