CentOS 7.0 - man page for hwloc-gather-topology (centos section 1)
|Linux & Unix Commands - Search Man Pages
HWLOC-GATHER-TOPOLOGY(1) hwloc HWLOC-GATHER-TOPOLOGY(1)
hwloc-gather-topology - Saves the relevant Linux topology files and the lstopo output for
later (possibly offline) usage
hwloc-gather-topology [options] <path>
-h --help display help message and exit
hwloc-gather-topology saves all the relevant topology files into an archive
(<path>.tar.bz2) and the lstopo output (<path>.output). The utility for example stores
the /proc/cpuinfo file and the entire /sys/devices/system/node/ directory tree.
These files can be used later to explore the machine topology offline. Once the tarball
has been extracted, it may for instance be given to some hwloc command-line utilities
through their --input option. It is also possible to override the default topology that
the hwloc library will read by setting the extracted path in the HWLOC_FSROOT environment
Both archive and lstopo output may also be submitted to hwloc developers to debug issues
hwloc-gather-topology is a Linux specific tool, it is not installed on other operating
NOTE: It is highly recommended that you read the hwloc(7) overview page before reading
this man page.
To store topology information to be used later (possibly on a different host) please run:
It will store all relevant topology files in the /tmp/myhost.tar.bz2 archive and the
lstopo output in the /tmp/myhost.output file. These files can be transferred on another
host for later/offline analysis and/or as the input to various hwloc utilities.
To use these data with hwloc utilities you have to unpack myhost.tar.bz2 archive first:
tar jxvf /tmp/myhost.tar.bz2
A new directory named myhost now contains all topology files. Then you ask various hwloc
utilities to use this topology instead of the one of the real machine by passing --input
myhost. To display the topology just run:
lstopo --input ./myhost
It is not necessary that the topology is extracted in the current directory, absolute or
relative paths are also supported:
lstopo --input /path/to/remote/host/extracted/topology/
To see how hwloc would distribute 8 parallel jobs on the original host:
hwloc-distrib --input myhost --single 8
To get the corresponding physical indexes in the previous command:
hwloc-calc --input myhost --po --li --proclist $(hwloc-distrib --input myhost --sin-
Any program may actually override the default topology with a given archived one even if
it does not have a --input option. The HWLOC_FSROOT environment variable should be used
to do so:
HWLOC_FSROOT=myhost hwloc-calc --po --li --proclist $(hwloc-distrib --single 8)
All these commands will produce the same output as if executed directly on the host on
which the topology information was originally gathered by the hwloc-gather-topology
Upon successful execution, hwloc-gather-topology will exit with the code 0.
hwloc-gather-topology will return nonzero exit status if any kind of error occurs, such as
(but not limited to) failure to create the archive or output file.
hwloc(7), lstopo(1), hwloc-calc(1), hwloc-distrib(1)
1.7 Apr 07, 2013 HWLOC-GATHER-TOPOLOGY(1)
All times are GMT -4. The time now is 04:55 AM.