Building and Installing

First of all, download Nornir:

$ git clone git://github.com/DanieleDeSensi/nornir.git
$ cd nornir

To compile Nornir:

$ mkdir build
$ cd build
$ cmake ../
$ make

Then, you can install it:

$ make install

To install it into a non-default directory dir, simply specify the -DCMAKE_INSTALL_PREFIX=dir when calling cmake.

Configuring the System

Some operations performed by Nornir are hardware-specific (e.g. reading the system energy consumption, dynamically chaning the clock frequency, etc..). To perform such operations Nornir relies on the Mammut library, and you may want to refer to the Mammut documentation for more information. However, these are the main points to consider:

• To change the frequency, Mammut assumes that the acpi_cpufreq driver is used for scaling the clock frequency. Mammut currently does not support the intel_pstate driver. If your machine is using the intel_pstate driver, you should switch to acpi_cpufreq

• On Intel and AMD processors, you should load the msr kernel module to allow Mammut to read the energy consumption. For PowerPC and ARM processors please refer to the Mammut documentation.

• Changing the frequeency and reading the energy usually require sudo rights, and the easiest option would be to just run your application with sudo. If this is not possible, Mammut supports the msr-safe library. If you want to use msr-safe, please contact me and I will provide you the MSR registers whitelist.