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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