Provided by: hwloc-nox_2.7.0-2ubuntu1_amd64 
NAME
hwloc-info - Show some information about some objects or about a topology or about support
features
SYNOPSIS
hwloc-info [ options ]... <object>...
hwloc-info [ options ]...
Note that hwloc(7) provides a detailed explanation of the hwloc system and of valid
<object> formats; it should be read before reading this man page.
OPTIONS
--objects
Report information specific objects. This is the default if some objects are given
on the command-line.
--topology
Report a summary of the topology instead of about some specific objects. This is
the default if no object is given on the command-line.
--support
Report the features that are supported by hwloc on the topology. The features are
those available through the hwloc_topology_get_support() function. This is useful
for verifying which CPU or memory binding options are supported by the current
hwloc installation.
-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.
-v --verbose
Include additional detail.
-s --silent
Reduce the amount of details to show. A single summary line per object is
displayed.
--ancestors
Display information about the object as well as about all its ancestors up to the
root of the topology.
--ancestor <type>
Only display the object ancestors that match the given type.
--children
Display information about the object children.
--descendants <type>
Display information about the object descendants that match the given type.
--local-memory
Display information about the NUMA nodes that are local to the given object.
--local-memory-flags
Change the flags used to select local NUMA nodes. Flags may be given as numeric
values or as a comma-separated list of flag names that are passed to
hwloc_get_local_numanode_objs(). Those names may be substrings of actual flag
names as long as a single one matches. The default is 3 (or smaller,larger) which
means NUMA nodes are displayed if their locality either contains or is contained in
the locality of the given object.
This option enables --local-memory.
--best-memattr <name>
Enable the listing local memory nodes with --local-memory, but only display the
local node that has the best value for the memory attribute given by <name> (or as
an index). If the memory attribute values depend on the initiator, the object
given to hwloc-info is used as the initiator.
-n When outputting object information, prefix each line with the index of the
considered object within the input. For instance, if three cores were given in
input, the output lines will be prefixed with "0: ", "1: " or "2: ". If --ancestor
is also used, the prefix will be "X.Y: " where X is the index of the considered
object within the input, and Y is the parent index (0 for the object itself,
increasing towards the root of the topology).
--disallowed
Include objects disallowed by administrative limitations.
--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).
--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 and Misc), only important objects are kept.
See hwloc_topology_set_type_filter() for more details.
--no-icaches
Do not show Instruction caches, only Data and Unified caches are considered. This
is identical to --filter icache: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
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 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 are shown.
--thissystem
Assume that the selected backend provides the topology for the system on which we
are running. This is useful when using --restrict binding and loading a custom
topology such as an XML file.
--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 binding by marking the
corresponding PUs (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.
-p --physical
Use OS/physical indexes instead of logical indexes for input.
-l --logical
Use logical indexes instead of physical/OS indexes for input (default).
--version
Report version and exit.
-h --help
Display help message and exit.
DESCRIPTION
hwloc-info displays information about the specified object. It is intended to be used
with tools such as grep for filtering certain attribute lines. When no object is
specified, or when --topology is passed, hwloc-info prints a summary of the topology.
When --support is passed, hwloc-info lists the supported features for the topology.
Objects may be specified as location tuples, as explained in hwloc(7). However
hexadecimal bitmasks are not accepted since they may correspond to multiple objects.
NOTE: It is highly recommended that you read the hwloc(7) overview page before reading
this man page. Most of the concepts described in hwloc(7) directly apply to the hwloc-
calc utility.
EXAMPLES
To display information about each package:
$ hwloc-info package:all
Package L#0
logical index = 0
...
To display information about the core whose physical index is 2:
$ hwloc-info -p core:2
Core L#1
logical index = 1
os index = 2
...
To list the NUMA nodes that are local a PU:
$ hwloc-info --local-memory pu:25
NUMANode L#6 = local memory #0 of PU L#25
type = NUMANode
...
NUMANode L#7 = local memory #1 of PU L#25
type = NUMANode
...
To show the best-bandwidth node among NUMA nodes local to a PU:
$ hwloc-info --local-memory --best-memattr bandwidth pu:25
NUMANode L#7 = local memory #1 of PU L#25
type = NUMANode
...
SEE ALSO
hwloc(7), lstopo(1), hwloc-calc(1), hwloc-bind(1), hwloc-ps(1)