CODEWITHSUNDEEP
c++microbenchmark
Tandura
Tandura

Reputation: 908

google microbenchmarking cpu scaling warning

When I run the google benchmark I get a WARNING saying that cpu scaling is enabled. Is that a feature that I can toggle at build via flags or at runtime via arguments or is it a system setting?

Upvotes: 25

Views: 7521

Answers (2)

Paweł Bylica
Paweł Bylica

Reputation: 4195

As stated in google benchmark documentation, to disable CPU scaling use cpupower tool.

sudo cpupower frequency-set --governor performance
./mybench
sudo cpupower frequency-set --governor powersave

Upvotes: 31

Mohsen Zahraee
Mohsen Zahraee

Reputation: 3473

To change your CPU mode (governor), you should become root or use sudo, then one of powersave or performance should be echo in the file /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor.

So, let’s say we want to switch from powersave mode to performance mode, we will do:

sudo sh -c "echo performance | tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor"

And if we want to switch back to powersave mode, we will do:

sudo sh -c "echo powersave | tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor"

And to get our current CPU mode, we will type:

cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor

Upvotes: 1

Related Questions