Section: New Results

Voltage Overscaling Algorithms for Energy-Efficient Workflow Computations With Timing Errors

Participants : Aurélien Cavelan, Yves Robert, Hongyang Sun, Frédéric Vivien.

We proposed a software-based approach using dynamic voltage overscaling to reduce the energy consumption of HPC applications. This technique aggressively lowers the supply voltage below nominal voltage, which introduces timing errors, and we used Algorithm-Based Fault-Tolerance (ABFT) to provide fault tolerance for matrix operations. We introduced a formal model, and we designed optimal polynomial-time solutions, to execute a linear chain of tasks. Evaluation results obtained for matrix multiplication demonstrated that our approach indeed leads to significant energy savings, compared to the standard algorithm that always operates at nominal voltage.

This work has been published in the proceedings of the 5th Workshop on Fault Tolerance for HPC at eXtreme Scale [23] .