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SCHEDULE: NOV 15-20, 2015
When viewing the Technical Program schedule, on the far righthand side is a column labeled "PLANNER." Use this planner to build your own schedule. Once you select an event and want to add it to your personal schedule, just click on the calendar icon of your choice (outlook calendar, ical calendar or google calendar) and that event will be stored there. As you select events in this manner, you will have your own schedule to guide you through the week.
Node-Level Performance Engineering
SESSION: Node-Level Performance Engineering
EVENT TYPE: Tutorials
EVENT TAG(S): Power, Performance
TIME: 8:30AM - 5:00PM
Presenter(s):Georg Hager, Jan Eitzinger, Gerhard Wellein
ROOM:18C
ABSTRACT:
The advent of multi- and manycore chips has led to a further opening of the gap between peak and application performance for many scientific codes. This trend is accelerating as we move from petascale to exascale. Paradoxically, bad node-level performance helps to “efficiently” scale to massive parallelism, but at the price of increased overall time to solution. If the user cares about time to solution on any scale, optimal performance on the node level is often the key factor. We convey the architectural features of current processor chips, multiprocessor nodes, and accelerators, as far as they are relevant for the practitioner. Peculiarities like SIMD vectorization, shared vs. separate caches, bandwidth bottlenecks, and ccNUMA characteristics are introduced, and the influence of system topology and affinity on the performance of typical parallel programming constructs is demonstrated. Performance engineering and performance patterns are suggested as powerful tools that help the user understand the bottlenecks at hand and to assess the impact of possible code optimizations. A cornerstone of these concepts is the roofline model, which is described in detail, including useful case studies, limits of its applicability, and possible refinements.
Chair/Presenter Details:
Georg Hager - Erlangen Regional Computing Center
Jan Eitzinger - Erlangen Regional Computing Center
Gerhard Wellein - University of Erlangen-Nuremberg
Click here to download .ics calendar file
