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Refine docs on changing cpufreq governor (#1325)

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Ensure we don't have users accidentally putting their CPUs into
powersave.

Fixes #1048
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Dominic Hamon 2022-01-17 14:52:02 +00:00 committed by GitHub
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docs/user_guide.md
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@ -1227,10 +1227,16 @@ If you see this error:
***WARNING*** CPU scaling is enabled, the benchmark real time measurements may be noisy and will incur extra overhead. ***WARNING*** CPU scaling is enabled, the benchmark real time measurements may be noisy and will incur extra overhead.
``` ```
you might want to disable the CPU frequency scaling while running the benchmark: you might want to disable the CPU frequency scaling while running the benchmark using a script like:
```bash ```bash
sudo cpupower frequency-set --governor performance for f in /sys/devices/system/cpu/cpu?/cpufreq/scaling_governor
./mybench do
sudo cpupower frequency-set --governor powersave before=`cat $f`
echo "performance" > $f
./mybench # run your benchmark here
echo $before > $f
done
``` ```
note, you will have to run this as root (under sudo).