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DTSTART;TZID=Europe/Paris:20251009T121000
DTEND;TZID=Europe/Paris:20251009T143000
DTSTAMP:20260420T052043
CREATED:20251008T140057Z
LAST-MODIFIED:20251008T140057Z
UID:1833-1760011800-1760020200@ceec-coe.eu
SUMMARY:Mixed-Precision and Energy-Efficient Computations
DESCRIPTION:If you’re at the Workshop on Approximate Computing in Numerical Linear Algebra in Paris this week\, don’t miss Yanxiang Chen’s  lunch poster talk on mixed precision and energy efficient computations! \nAbstract: High Performance Computing has traditionally focused on optimizing between memory usage\, arithmetic intensity\, parallelism\, and communication costs. However\, as simulations grow\, energy consumption has surged\, presenting significant sustainability challenges for large-scale computing infrastructures. Addressing these challenges requires innovative strategies that enhance energy efficiency without compromising computational accuracy or performance.\nWe present a systematic methodology for reducing the energy footprint of large-scale simulations via mixed-precision computing\, without compromising accuracy or performance. Our approach combines performance profiling with numerical sensitivity analysis to identify precision-insensitive code regions\, select promising candidates\, and gradually convert them to lower precision. Applied to representative high-performance computing kernels\, this strategy yields up to 40% speedup and 47% energy savings in an implicit Poisson solver\, and roughly 30% gains in both execution time and energy consumption in explicit solvers\, all while preserving double-precision level accuracy. These results demonstrate that our methodology provides a versatile and effective lever for enhancing the sustainability of HPC applications.
URL:https://ceec-coe.eu/event/mixed-precision-and-energy-efficient-computations-2/
CATEGORIES:Conference
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20251009T155000
DTEND;TZID=Europe/Paris:20251009T161000
DTSTAMP:20260420T052043
CREATED:20251008T135146Z
LAST-MODIFIED:20251008T135146Z
UID:1831-1760025000-1760026200@ceec-coe.eu
SUMMARY:Mixed-Precision Strategies in Spectral Element Codes: Accuracy-Aware Approximation for Energy-Efficient Simulations
DESCRIPTION:If you’re at the Workshop on Approximate Computing in Numerical Linear Algebra in Paris this week\, chec out Roman Iakymchuk’s talk on mixed-precision strategies in spectral element codes on Thursday! \nAbstract: Approximate computing via mixed precision arithmetic offers a promising path to energy-efficient high-performance computing. However\, identifying where and how to apply reduced precision without compromising solution accuracy remains a key challenge in scientific simulations. In this talk\, we present a comprehensive methodology for enabling mixed-precision in spectral element codes using floating-point analysis tools\, roofline modeling\, and empirical verification. We apply our strategy to Nekbone and Neko—two fluid dynamics solvers—by combining reduced-precision iterative solvers with double-precision critical operations such as dot products and global communications. Our method is supported by Verificarlo’s Monte Carlo arithmetic and precision emulation\, which help detect numerically stable kernels for approximation. The resulting mixed-precision versions deliver up to 2.38x faster time-to-solution and 2.8× lower energy-to-solution\, while retaining double-precision-level accuracy. This work highlights a practical\, accuracy-aware approach to integrating approximation into large-scale legacy applications\, making them fit for future exascale platforms.
URL:https://ceec-coe.eu/event/mixed-precision-strategies-in-spectral-element-codes-accuracy-aware-approximation-for-energy-efficient-simulations/
CATEGORIES:Conference
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20251022T140000
DTEND;TZID=Europe/Paris:20251022T150000
DTSTAMP:20260420T052043
CREATED:20251006T093146Z
LAST-MODIFIED:20251021T140651Z
UID:1766-1761141600-1761145200@ceec-coe.eu
SUMMARY:Extreme-Scale High-Fidelity Computational Fluid Dynamics with Neko
DESCRIPTION:Neko is a portable framework for high-order spectral element-based simulations\, mainly focusing on incompressible/compressible flow. The framework is written in a modern object-oriented approach and supports various hardware backends\, ranging across general-purpose processors\, accelerators\, and vector processors. Neko has demonstrated excellent performance and scalability across various hardware architectures and was nominated as a finalist for the ACM Gordon Bell prize in 2023. \nIn this webinar\, we will provide an introduction to Neko and its capabilities\, from installation to creating and running simulations. Special focus will also be on the major changes in terms of features and functionalities\, user interaction\, and improvements made in the upcoming release of Neko v1.0. By the end of the webinar\, attendees will have a basis as well as references and materials to start working with Neko on their own time.
URL:https://ceec-coe.eu/event/extreme-scale-high-fidelity-computational-fluid-dynamics-with-neko/
LOCATION:Online
ATTACH;FMTTYPE=image/png:https://ceec-coe.eu/wp-content/uploads/2025/10/NekoPoster-e1759755285466.png
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