Ubuntu Manpage: likwid-setFrequencies - print and manage the clock frequency of hardware threads

NAME

       likwid-setFrequencies - print and manage the clock frequency of hardware threads

SYNOPSIS

       likwid-setFrequencies  [-hvplmp]  [-c  <cpu_list>] [-g <governor>] [-f,--freq <frequency>]
       [-x,--min <min_freq>] [-y,--max <max_freq>] [-t,--turbo <0|1>] [--umin  <uncore_min_freq>]
       [--umax <uncore_max_freq>] [--reset] [--ureset]

DESCRIPTION

       likwid-setFrequencies is a command line application to set the clock frequency of hardware
       threads. Since only priviledged users are allowed to  change  the  frequency  of  hardware
       threads, the application works in combination with a daemon likwid-setFreq(1).  The daemon
       needs the suid permission bit to be set in order to manipulate  the  sysfs  entries.  With
       likwid-setFrequencies  the  clock  of  all hardware thread inside the cpu_list or affinity
       domain can be set to a specific frequency  or  governor  at  once.   likwid-setFrequencies
       works now with the cpufreq drivers 'acpi-cpufreq' and 'intel_pstate'.

OPTIONS

-h prints a help message to standard output, then exits

-p prints the current frequencies for all hardware threads

-l prints all configurable frequencies

-m prints all configurable governors

-c <cpu_list>
set the affinity domain where to set the frequencies. Common are N (Node), SX
(Socket X), CX (Cache Group X) and MX (Memory Group X). For detailed information
about affinity domains see likwid-pin(1)

-g <governor>
set the governor of all hardware threads inside the affinity domain. Current
governors are ondemand, performance, turbo. Default is ondemand

-f, --freq <frequency>
set a fixed frequency at all hardware threads inside the affinity domain.
Implicitly sets 'userspace' governor for the hardware threads when using the acpi-
cpufreq driver.

-x, --min <min_freq>
set a fixed minimal frequency at all hardware threads inside the affinity domain.
Can be used in combination with a dynamic governor.

-y, --max <max_freq>
set a fixed maximal frequency at all hardware threads inside the affinity domain.
Can be used in combination with a dynamic governor.

-t, --turbo <0|1>
deactivates/activates Turbo mode for the specified hardware threads.

--umin <uncore_min_freq>
set the minimal frequency for the Uncore. There are no limits available, but
likwid-setFrequencies allows the available minimal CPU frequency as minimal Uncore
frequency. Only available for Intel architectures.

--umax <uncore_max_freq>
set the maximal frequency for the Uncore. There are no limits available, but
likwid-setFrequencies allows the available maximal CPU frequency (with a single
hardware thread and Turbo) as maximal Uncore frequency. Only available for Intel
architectures.

--reset
resets the hardware threads to maximal range, deactivates Turbo mode and sets the
governor to "performance", "conservative" or the last one in the governor list as
fallback

--ureset
resets the Uncore to maximal range. It uses the minimally available CPU frequency
as minimal Uncore frequency and the maximally achievable CPU frequency (single
core, Turbo active) as maximal Uncore frequency.

AUTHOR

       Written by Thomas Gruber <thomas.roehl@googlemail.com>.

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