HWLOC-INFO(1) hwloc HWLOC-INFO(1)
hwloc-info - Show some information about some objects or about a topology
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
-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 the chroot specified by <directory> (instead of discovering the topology on the local machine). This option is
generally only available on Linux. The chroot was usually created by gathering another machine topology with hwloc-gather-topology.
-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
--if <format>, --input-format <format>
Enforce the input in the given format, among xml, fsroot and synthetic.
Include additional detail.
Reduce the amount of details to show. A single summary line per object is displayed.
Display information about the object as well as about all its ancestors up to the root of the topology.
Only display the object ancestors that match the given type.
-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 pre-
fix 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).
Do not consider administration limitations.
Restrict the topology to the given cpuset.
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).
Do not show any I/O device or bridge. By default, common devices (GPUs, NICs, block devices, ...) and interesting bridges are
Do not show any I/O bridge except hostbridges. By default, common devices (GPUs, NICs, block devices, ...) and interesting bridges
Show all I/O devices and bridges. By default, only common devices (GPUs, NICs, block devices, ...) and interesting bridges are
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.
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 graphi-
cal 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.
Use OS/physical indexes instead of logical indexes for input.
Use logical indexes instead of physical/OS indexes for input (default).
Report version and exit.
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, hwloc-info prints a summary of 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.
To display information about each socket:
$ hwloc-info socket:all
logical index = 0
To display information about the core whose physical index is 2:
$ utils/hwloc-info -p core:2
logical index = 1
os index = 2
hwloc(7), lstopo(1), hwloc-calc(1), hwloc-bind(1), hwloc-ps(1), hwloc-gather-topology(1)
1.7 Apr 07, 2013 HWLOC-INFO(1)