RAPL

RAPL stand for Running Average Power Limit, it is a feature of recent intel processors that provide the energy consumption of the processor.

The RAPL formula is designed to mesure power consumption of domains (cpu or ram) in real time.

The RAPL formula take HWPC report with RAPL event for each domains. It then return the mesured power in a PowerReport for each domain. This formula do not perform any other computation as its goal is only to track global power consumption in a more readable way than raw RAPL.

Installation

You can use the following script to install RAPL Formula and HWPC Sensor.

From pypi

pip install rapl-formula

From docker

docker pull powerapi/rapl-formula

From deb file

Download the .deb files (rapl-formula and thespian) from the latest release

Install rapl-formula with sudo apt install ./python3-rapl-formula_0.5.0-1_all.deb

Quickstart

For running the RAPL formula we'll need two things:

A sensor that provide HWPCReport. We'll use HWPC sensor.
A configuration for the formula. We provide an example bellow.

{
  "verbose": true,
  "stream": true,
  "input": {
    "puller": {
      "model": "HWPCReport",
      "type": "mongodb",
      "uri": "mongodb://127.0.0.1",
      "db": "test",
      "collection": "prep"
    }
  },
  "output": {
    "pusher_power": {
      "type": "mongodb",
      "model": "PowerReport",
      "type": "mongodb",
      "uri": "mongodb://127.0.0.1",
      "db": "test",
      "collection": "results"
    }
  },
  "enable-dram-formula": false,
  "sensor-report-sampling-interval": 500
}

Start by installing the hwpc-sensor (see here) and start it (see here). You also need to start an mongodb via the command line docker run -d --name mongo_rapl -p 27017:27017 mongo.

Then run rapl_formula using one of the following command line, depending on the installation you used:

via pip : python -m rapl_formula --config-file config_file.json
via docker docker run -t --net=host -v $(pwd)/config_file.json:/config_file.json powerapi/rapl-formula --config-file /config_file.json
via deb file : rapl-formula --config-file config_file.json

Your power report will be provided in the influxdb. You can watch them in a grafana using the following tutorial

User guide

Configuration parameters

enable-cpu-formula (bool) : Enable CPU formula, default=True
enable-dram-formula(bool) : Enable DRAM formula, default=True

PowerAPI