geopmwrite(1) -- modify platform state ====================================== Synopsis -------- Print All Control Names ^^^^^^^^^^^^^^^^^^^^^^^ .. code-block:: bash geopmwrite Print Domain Name And Size ^^^^^^^^^^^^^^^^^^^^^^^^^^ .. code-block:: bash geopmwrite --domain Print Control Description ^^^^^^^^^^^^^^^^^^^^^^^^^ .. code-block:: bash geopmwrite --info CONTROL_NAME Print All Control Descriptions ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ .. code-block:: bash geopmwrite --info-all Write Control ^^^^^^^^^^^^^ .. code-block:: bash geopmwrite CONTROL_NAME DOMAIN_TYPE DOMAIN_INDEX VALUE Create Cache ^^^^^^^^^^^^ .. code-block:: bash geopmwrite --cache Get Help Or Version ^^^^^^^^^^^^^^^^^^^ .. code-block:: bash geopmwrite --help geopmwrite --version Description ----------- Provides a command line interface to ``PlatformIO`` and ``PlatformTopo``. This tool can be used to write hardware/OS state through high-level control aliases and query other information about the platform such as the type and number of hardware domains. Details of the hardware domains can also be inferred from the output of `lscpu(1) `_. When run without any arguments, the default behavior is to print a summary of available controls. To write a specific control, ``geopmwrite`` should be run with four arguments. ``CONTROL_NAME`` is the name of the control of interest. ``DOMAIN_TYPE`` is hardware domain to which the control should be applied. ``DOMAIN_INDEX`` is used to indicate which instance of the domain to write to; indexing starts from 0 and goes up to the domain size - 1. ``VALUE`` is the floating-point number in SI units that the control will be adjusted to. If the ``DOMAIN_TYPE`` is a larger containing domain than that of the control, the same value will be applied to every contained subdomain. Refer to the domain hierarchy described in :doc:`geopm::PlatformTopo(3) ` for the descriptions of the domains and how they are contained within one another. | ``board`` - domain for node-wide signals and controls | ++ ``package`` - socket | ++++ ``core`` - physical core | ++++++ ``cpu`` - Linux logical CPU | ++++ ``package_integrated_memory`` - on-package memory | ++++ ``package_integrated_nic`` - NIC within the package | ++++ ``package_integrated_gpu`` - domain for GPUs within the package | ++ ``memory`` - other memory outside the package | ++ ``nic`` - NIC attached to the board | ++ ``gpu`` - domain for GPUs on the board This utility can be used to create a ``geopm::PlatformTopo`` cache file in the tmpfs. When this file is not present the :doc:`geopmread(1) `, :doc:`geopmwrite(1) `, :doc:`geopmctl(1) ` and :doc:`geopmlaunch(1) ` will `popen(3) `_ a subprocess which provides the platform topology information. This subprocess will not be created if the cache file exists. See the ``--cache`` option below for more information. Options ------- -d, --domain Print a list of all domains on the system. -i, --info Print description of the provided ``CONTROL_NAME``. -I, --info-all Print a list of all available controls with their descriptions, if any. -c, --cache Create a cache file for the ``geopm::PlatformTopo`` object if one does not exist or if the existing cache is from a previous boot cycle. If a privileged user requests this option (e.g. root or if invoked with sudo) the file path will be ``/run/geopm/geopm-topo-cache``. If a non-privileged user requests this option the file path will be ``/tmp/geopm-topo-cache-``. In either case, the permissions will be ``-rw-------``, i.e. **600**. If the file exists from the current boot cycle and has the proper permissions no operation will be performed. To force the creation of a new cache file, remove the existing cache file prior to executing this command. -h, --help Print brief summary of the command line usage information, then exit. -v, --version Print version of :doc:`geopm(7) ` to standard output, then exit. Examples -------- List domains and size: .. code-block:: $ geopmwrite --domain board 1 package 2 core 64 cpu 128 memory 2 package_integrated_memory 1 nic 1 package_integrated_nic 0 gpu 0 package_integrated_gpu 0 List all available controls on the system with domain type and number: .. code-block:: $ geopmwrite CPU_FREQUENCY_MAX_CONTROL CPU_POWER_LIMIT_CONTROL Show the description for a control: .. code-block:: $ geopmwrite --info CPU_FREQUENCY_MAX_CONTROL CPU_FREQUENCY_MAX_CONTROL: Set processor frequency Show domain type for ``CPU_POWER`` control: .. code-block:: $ geopmwrite --domain CPU_POWER package Set the frequency of CPU 2 to 1.9 *GHz*: .. code-block:: $ geopmwrite CPU_FREQUENCY_MAX_CONTROL cpu 2 1.9e9 $ geopmread CPU_FREQUENCY_MAX_CONTROL cpu 2 1.9e9 Set all CPUs on package 0 to 1.5 *GHz* (cpu 1 is on package 0): .. code-block:: $ geopmwrite CPU_FREQUENCY_MAX_CONTROL package 0 1.5e9 $ geopmread CPU_FREQUENCY_MAX_CONTROL cpu 1 1.5e9 See Also -------- :doc:`geopm(7) `, :doc:`geopmread(1) `, `lscpu(1) `_