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EAR 4.2.1
EAR Reference Manual
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Introduction {#mainpage}
Energy Aware Runtime (EAR) is an energy management framework for super computers. EAR contains different components, all together provide three main services:
An easy-to-use and lightweight optimization service to automatically select the optimal CPU, memory and GPU frequency according to the application and the node characteristics. This service is provided by two components: the EAR Library (EARL) and the EAR Node Manager (EARD).
EARL is a smart component which is loaded next to the application and offers application metrics monitoring and it can select the frequencies based on the application behaviour on the fly. The Library is loaded automatically through the EAR Loader (EARLO) and it can be easly integrated with different system batch schedulers (e.g., SLURM).
A complete energy and performance accounting and monitoring system mainly based on relational SQL databases (MariaDB and PostgreSQL are currently supported). The energy accounting system is configurable in terms of application details and update frequency.
The EAR Database (EARDBD) is used to cache those metrics prior to DB insertions and optimize the connectivity with the DB server. Current EAR version already includes several report plugins for non-relational Databases such as EXAMON.
Visit the architecture page for a detailed description of each of these components. The user guide contains information about how to user EAR as an end user in a production environment. The admin guide has all the information related to the installation and setting up, as well as all core components details.
EAR is a open source software and it is licensed under both the BSD-3 license and EPL-1.0 license. Full text of both licenses can be found in COPYING.BSD and COPYING.EPL files.
Contact: ear-support@bsc.es