Learning phase

This is a necessary phase prior to the normal EAR utilization and is a kind of hardware characterization of the nodes. During the phase a matrix of coefficients are calculated and stored. These coefficients will be used to predict the energy consumption and performance of each application.

Please, visit the learning phase wiki page to read the manual and the repository to get the scripts and the kernels.

Tools

The following table lists tools provided with EAR package to work with coefficients computed during the learning phase.

Name	Description	Basic arguments
coeffs_compute	Computes the learning coefficients.	<save path> <min_freq> <nodename>
coeffs_default	Computes the default coefficients file.
coeffs_null	Creates a dummy configuration file to be used by EARD.	<coeff_path>, <max_freq> <min_freq>
coeffs_show	Shows the computed coefficients file in text format.	<file_path>

Use the argument --help to expand the application information and list the admitted flags.

Examples

Compute the coefficients for the node node1001 in which the minimum frequency set during the learning phase was 1900000 KHz

./coeffs_compute /etc/coeffs 1900000 node1001