Man1 - hwloc-gather-cpuid.1

hwloc-gather-cpuid - Dumps the relevant x86 cpuid values for later (possibly offline) usage

hwloc-gather-cpuid [/options/] [/<outdir>/]

-c <idx>

Only gather cpuid values for logical processor whose OS/physical index is <idx>.

-s –silent

Do not show verbose messages.

–version

Report version and exit.

-h –help

Display help message and exit.

hwloc-gather-cpuid dumps all the relevant x86 cpuid values into subdirectory cpuid of current directory, or in <outdir> if specified.

These files can be used later to explore the machine topology offline, for instance by setting the environment variable HWLOC_CPUID_PATH to the directory containing all output files, and by forcing the x86 backend with HWLOC_COMPONENTS=x86,stop.

The directory contents may also be submitted to hwloc developers to debug issues remotely.

If - is used as <outdir>, the output is dumped to the standard output, but a unique logical processor must have been given with -c.

hwloc-gather-cpuid is a x86 specific tool, it cannot be used on other platforms.

NOTE: hwloc-gather-cpuid gathers many hardware details about the platform. Output files should not be posted on public lists or websites unless it is clear that they contain no sensitive information.

NOTE: The output of hwloc-gather-cpuid is included in the tarball saved by hwloc-gather-topology on Linux/x86.

NOTE: It is highly recommended that you read the hwloc(7) overview page before reading this man page.

To store cpuid information of all logical processors of the current machine:

$ hwloc-gather-cpuid Gathering in directory ./cpuid … Gathering CPUID of PU P#0 in path ./hwloc-x86-cpuid/pu0 … Gathering CPUID of PU P#1 in path ./hwloc-x86-cpuid/pu1 … Gathering CPUID of PU P#2 in path ./hwloc-x86-cpuid/pu2 … Gathering CPUID of PU P#3 in path ./hwloc-x86-cpuid/pu3 … Summary written to ./cpuid/hwloc-cpuid-info

Upon successful execution, hwloc-gather-cpuid will exit with the code 0.

hwloc-gather-cpuid will return nonzero exit status if any kind of error occurs, such as (but not limited to) failure to create the output files.

hwloc(7), hwloc-gather-topology(1), lstopo(1)