This is the command hwloc-gather-topology that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
PROGRAM:
NAME
hwloc-gather-topology - Saves the relevant Linux topology files and the lstopo output for
later (possibly offline) usage
SYNOPSIS
hwloc-gather-topology [options] <path>
OPTIONS
--io Also gather I/O related files. The gathering may be much slower, and the generated
archive may be much bigger. --dmi Also gather DMI/SMBIOS related files. The
gathering requires root access, and the dmi-sysfs kernel module should be loaded.
-h --help
Display help message and exit
DESCRIPTION
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
variable.
Both archive and lstopo output may also be submitted to hwloc developers to debug issues
remotely.
hwloc-gather-topology is a Linux specific tool, it is not installed on other operating
systems.
NOTE: It is highly recommended that you read the hwloc(7) overview page before reading
this man page.
EXAMPLES
To store topology information to be used later (possibly on a different host) please run:
hwloc-gather-topology /tmp/myhost
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
--single 8)
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
script.
RETURN VALUE
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.
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