.TH LIKWID-SETFREQUENCIES 1 26.11.2018 likwid\-4
.SH NAME
likwid-setFrequencies \- print and manage the clock frequency of CPU cores
.SH SYNOPSIS
.B likwid-setFrequencies 
.RB [\-hvplmp]
.RB [ \-c
.IR <cpu_list> ]
.RB [ \-g
.IR <governor> ]
.RB [ \-f,\-\-\^freq
.IR <frequency> ]
.RB [ \-x,\-\-\^min
.IR <min_freq> ]
.RB [ \-y,\-\-\^max
.IR <max_freq> ]
.SH DESCRIPTION
.B 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
.B likwid-setFreq(1).
The daemon needs the suid permission bit to be set in order to manipulate the sysfs entries. With
.B likwid-setFrequencies
the clock of all cores inside a the cpu_list or affinity domain can be set to a specific frequency or governor at once.
.B likwid-setFrequencies
works only with the kernel module
.B acpi-cpufreq.
The recent
.B intel_pstate
module does not allow one to set fixed frequencies. In order to deactivate
.B intel_pstate
add 'intel_pstate=disable' to your kernel boot commandline (commonly in grub) and load the
.B acpi-cpufreq
module.
.SH OPTIONS
.TP
.B \-h
prints a help message to standard output, then exits.
.TP
.B \-p
prints the current frequencies for all CPU cores
.TP
.B \-l
prints all configurable frequencies
.TP
.B \-m
prints all configurable governors
.TP
.B \-\^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
.B likwid-pin(1)
.TP
.B \-\^g <governor>
set the governor of all CPU cores inside the affinity domain. Current governors are ondemand, performance, turbo. Default is ondemand
.TP
.B \-\^f, \-\-\^freq <frequency>
set a fixed frequency at all CPU cores inside the affinity domain. Implicitly sets userspace governor for the cores.
.TP
.B \-\^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.
.TP
.B \-\^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.

.SH AUTHOR
Written by Thomas Roehl <thomas.roehl@googlemail.com>.
.SH BUGS
Report Bugs on <https://github.com/RRZE-HPC/likwid/issues>.
.SH "SEE ALSO"
likwid-pin(1), likwid-perfctr(1), likwid-powermeter(1)