16.08.15 - 21.08.15, Seminar 15342

Power-Bounded HPC Performance Optimization

Diese Seminarbeschreibung wurde vor dem Seminar auf unseren Webseiten veröffentlicht und bei der Einladung zum Seminar verwendet.

Motivation

With the goal of limiting its first exascale supercomputer to 20 MegaWatts of electricity, the US Department of Energy has moved the issue of power-limited high-performance computing to the front of its research priorities. But even before the design phase of exascale computing has begun, specifications for new petascale systems (such as CORAL and Tsubame 3) include stringent power bounds. Constructing these systems is, by now, only a moderate engineering challenge. However, writing and optimizing code that will make the best use of power-limited resources poses both scientific and engineering challenges that are only now beginning to be addressed. While the community has sufficient experience to handle porting and optimizing codes for larger numbers of processors and faster networks, optimizing for power requires expertise to be applied from cluster construction and site electrical contracts through job schedulers, load balancing algorithms, dynamic processor configuration and even the choices of algorithms and compiler optimizations.

This Dagstuhl Perspective Workshop will provide a novel setting to advance exascale HPC research. It provides a unique setting to help stakeholders in the HPC community to come to grips with the problem of power-limited optimization. For the first two days, our international panel of experts in facilities, schedulers, runtime systems, operating systems, processor architectures and applications will provide detailed perspectives on open problems in each of their fields that must be resolved in order to reach a useful power-constrained exaflop system. The second half of the workshop will consist of moderated discussion of these issues with the goal of understanding how potential local solutions affect the rest of the software stack.

One of the primary benefits of this workshop will be to align future research with a common set of goals and solutions. We expect it to influence how research is done on power-bounded HPC both in academia and national laboratories. Among others we expect the following results:

  1. A Strawman architecture of a power-limited supercomputing system as a basis for future work
  2. A journal paper detailing the Strawman architecture and its rationale
  3. A Dagstuhl Manifesto describing future funding requirements necessary to meet the goals
  4. An international collaboration plan across the exascale initiatives in Europe, Japan and the US

This Dagstuhl Perspectives Workshop is unusual in that we will be focusing on the “unknown”, rather than on the “state of the art”. While discussion is a vital component of any Dagstuhl event, here we will be taking the focus away from the presentations and placing it squarely on the interactions among the participants. We expect to forge several new collaborations across vendors, national laboratories and academia. And we would like to invite you to join us.