Invited Talk

Speaker: Frank Mueller

Title: Uncore Frequency Scaling: Untapped Power and Performance Benefits


Uncore frequency scaling (UFS) is a widely overlooked knob for reducing the power footprint of HPC jobs. We have developed a runtime system that dynamically detects phase changes and automatically sets the best uncore frequency for every phase of an application to save power without significant impact on performance. Experimental show up to 10% energy savings with under 1% slowdown and up to a 20% speedup and proportional energy savings relative to Intel’s RAPL with equivalent power usage.