LIKWID-SETFREQUENCIES

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 DOT roehl AT googlemail DOT com>.

BUGS

Report Bugs on <https://github.com/RRZE-HPC/likwid/issues>.

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