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Design & udviklingInternational news04. 01. 2021 | Rolf Sylvester-Hvid

CEA Combines 3D Integration Technologies & Many-Core Architectures to Enable High-Performance Processors That Will Power Exascale Computing

Design & udviklingInternational news04. 01. 2021 By Rolf Sylvester-Hvid

In an invited paper at IEDM 2020, CEA-List and CEA-Leti, research institutes at CEA, presented their technologies for achieving exascale-level, high- performance computing (HPC).

Highlighting CEA-Leti’s state-of-the-art, 3D-technology toolbox and CEA-List’s advanced demonstrators that together enable higher bandwidth and heterogeneity for processors, the paper explains architectural and performance advances and describes how 3D-integration technologies allow heterogeneity and increased bandwidth that are critical for hardware innovations that help enable exascale computing.

“Profound evolutions brought by high performance computing (HPC) applications are based on continuous and exponential increases in computing performances over the past decades,” explained the paper,How 3D integration technologies enable advanced compute node for Exascale-level High Performance Computing?. “Supercomputers will soon achieve exascale-level computing performances mainly thanks to the introduction of innovative hardware technologies around the processors.”

Exascale computingrefers to computing systems capable of calculating at least 10¹⁸, or one-billion-billion, floating-point operations per second, which would be twice as fast as the fastest computer available today.

Efforts to develop exascale computing are driven by highly data-intensive scientific and industrial applications, such as climate research, drug discovery and material design. This level of performance in HPC and Big Data will be achieved with heterogeneous computing nodes composed of generic processor chiplets hosting accelerator chiplets for improved operational intensity.

The CEA technologies presented in the paper are powering demonstrators in the ExaNoDe and INTACT projects, which havedeveloped integrated prototypes with technology building blocks to support the EU’s drive towards exascale computing. The two institutes combined CEA-Leti’s expertise in silicon and 3D sequential integration with CEA-List’s many-core architectures, which are differentiated by their high level of scalability and power efficiency. They have  demonstrated the benefit of new integration methods and processes following two main paths: finer 3D interconnect pitches, leading to improved bandwidth between compute chiplets, and assembly technologies that allow increasing heterogeneity in packaging, which improves peak performance.

In addition, the importance of a 3D-integration solution to developing HPC processors is confirmed by theEuropean Processor Initiative(EPI), with which CEA is deeply involved. Its aim is to design and implement a roadmap for a new family of low-power European processors for extreme scale computing, high-performance Big Data and a range of emerging applications.

“These R&D successes open a path towards heterogeneous processors that will enable exascale-level supercomputers,” said Denis Dutoit, a CEA-List scientist and lead author of the IEDM paper. “We demonstrated that co-optimization of advanced architectures with 3D integration technologies achieves the level of computing performance and bandwidth required for HPC.”

Because chiplets stacked on active interposer allow modularity and reusability at low development costs, CEA-List also is investigating using this new methodology for HPC architectures in the embedded world, for compute-intensive accelerators. For edge applications requiring a high level of computation and memory, such as artificial intelligence (AI), chiplet-based partitioning will enable the creation of a broad range of solutions to meet the needs for embedded AI. Potential uses include autonomous driving, transport applications and industry 4.0.

Current CEA-Leti research work addresses die-to-wafer direct hybrid-bonding technology, which offers denser 3D interconnects with better electrical, mechanical and thermal parameters, and allows ultrahigh-bandwidth capabilities in heterogeneous systems. CEA-Leti also is working on high-density through silicon vias (TSV) (pitch 1 to 4 µms) to create together with die-to-wafer hybrid bonding a complete dense 3D stack. For the longer term, CEA-Leti is also investigating innovative photonic-interposer technology as a 3D-based photonic chiplet approach to enable interconnection of tens of computing chiplets with the resulting chip-to-chip communication bandwidth, latency and energy.

Over the next decade, co-optimization of advanced integration technologies with disruptive architectures is expected to establish the key foundations for HPC components.

This work was funded by theFrench National Programme d’Investissements d’Avenir(Investments in the Future), IRT Nanoelec, under Grant ANR-10-AIRT-05.

This work also was supported by theExaNoDe project, funded by the European Union’s H2020 program under grant agreement No. 671578.

Skrevet i: Design & udvikling, International news

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