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)