Once vJoule is installed, you should find a directory located in /etc/vjoule that contains configurations, logs and results. For example, the service configuration is located in /etc/vjoule/config.toml.

• /etc/vjoule/config.toml: the configuration file of the vjoule_service. It can be modified to change the log level and some other options that depends on the core plugin used.
• /etc/vjoule/service.log: the log file of the vjoule_service,

Assuming you are using the divider core plugin (specified in the configuration file of the vjoule_service), the directory /etc/vjoule/results/MYSLICE/MYCGROUP contains the energy consumption estimation of the cgroup MYSLICE/MYCGROUP. This is where you will find the informations you're looking for.

By default, vJoule is configured to monitor its own service in a cgroup named vjoule.slice. The energy consumption of the sensor will then be stored in self-updating files located in /etc/vjoule/results/vjoule.slice/vjoule_service.service.

vJoule will give you up to five results files:

• ram - The energy consumption of the RAM
• cpu - The energy consumption of the CPU
• gpu - The energy consumption of the GPUs (sum if there are multiple gpus)

The value stored in the file correspond to the energy consumption, in joule, since vJoule have started monitoring these processes.

The divider core plugin also dumps the energy consumption of the whole system at the root of the result directory /etc/vjoule/results. There can be found the three files cpu, ram and gpu that contains the energy consumption in joule of the whole system since the start of the vJoule service (as acquired by the sensor plugins).