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Updated likwid setFrequencies (markdown) authored by Thomas Roehl's avatar Thomas Roehl
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likwid-setFrequencies.md
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...@@ -16,11 +16,17 @@ likwid-setFrequencies can only be used in conjunction with the `acpi-cpufreq` ke ...@@ -16,11 +16,17 @@ likwid-setFrequencies can only be used in conjunction with the `acpi-cpufreq` ke
-v Version information -v Version information
-c dom Likwid thread domain which to apply settings (default are all CPUs) -c dom Likwid thread domain which to apply settings (default are all CPUs)
See likwid-pin -h for details See likwid-pin -h for details
-g gov Set governor (conservative, ondemand, powersave, performance, turbo) (set to ondemand if omitted) -g gov Set governor (performance, powersave)
-f freq Set fixed frequency, implicitly sets userspace governor -f/--freq freq Set current, minimal and maximal CPU frequency
-p Print current frequencies -p Print current frequencies (CPUs + Uncore)
-l List available frequencies -l List available CPU frequencies
-m List available governors -m List available CPU governors
-F/--Freq freq Set current CPU frequency
-x/--min freq Set minimal CPU frequency
-y/--max freq Set maximal CPU frequency
--umin freq Set minimal Uncore frequency
--umax freq Set maximal Uncore frequency
``` ```
## Usage ## Usage
...@@ -49,6 +55,7 @@ CPU 9: governor performance frequency 3.001 GHz ...@@ -49,6 +55,7 @@ CPU 9: governor performance frequency 3.001 GHz
[...] [...]
``` ```
Starting with version 4.3.0 the `-p` switch prints also the min/max Uncore frequency.
When you know a valid frequency for a range of CPU cores you can set them: When you know a valid frequency for a range of CPU cores you can set them:
``` ```
...@@ -72,6 +79,9 @@ $ likwid-pin -p ...@@ -72,6 +79,9 @@ $ likwid-pin -p
``` ```
Prints all available affinity domains, see [[likwid-pin|likwid-pin]] Wiki page. Prints all available affinity domains, see [[likwid-pin|likwid-pin]] Wiki page.
### Manipulating Uncore frequency on Intel CPUs
Some Intel CPUs provide the possibility to change the Uncore frequency. You can use the `--umin` and `--umax` command line options to set it. One problem with the Uncore frequency is that the minimal and maximal frequency limits are not readable in all system configurations. Therefore LIKWID defines a range of supported frequencies. To be sure that the frequency you adjusted as requested, measure the `UNCORE_CLOCK` event using `likwid-perfctr`.
## Configuration of the setFreq daemon ## Configuration of the setFreq daemon
Since the daemon process `likwid-setFreq` requires higher privileges than the control script likwid-setFrequency. There are two methods to grant this to the daemon: Since the daemon process `likwid-setFreq` requires higher privileges than the control script likwid-setFrequency. There are two methods to grant this to the daemon:
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