Ubuntu Manpage: likwid-setFrequencies - print and manage the clock frequency of CPU cores

NAME

       likwid-setFrequencies - print and manage the clock frequency of CPU cores

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 CPU cores. Since only
       priviledged users are allowed to change the frequency of CPU cores, 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 cores 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 CPU cores

-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 CPU cores inside the affinity domain. Current governors are ondemand,
performance, turbo. Default is ondemand

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

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

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

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

--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 core and Turbo) as maximal Uncore
frequency. Only available for Intel architectures.

--reset
resets the CPU cores 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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