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| LIKWID-SETFREQUENCIES(1) |
General Commands Manual |
LIKWID-SETFREQUENCIES(1) |
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>]
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 a the cpu_list or affinity domain can be set to
a specific frequency or governor at once. likwid-setFrequencies works
only with the kernel module acpi-cpufreq. The recent
intel_pstate module does not allow one to set fixed frequencies. In
order to deactivate intel_pstate add 'intel_pstate=disable' to your
kernel boot commandline (commonly in grub) and load the acpi-cpufreq
module.
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.
- -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.
AUTHOR¶
Written by Thomas Roehl <thomas.roehl@googlemail.com>.
