Torsten Hoefler

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Torsten Hoefler
MAE
Torsten Hoefler.jpg
Alma mater Indiana University
TU Chemnitz
Awards
Scientific career
Fields High-Performance Computing
Computer Science
Institutions ETH Zurich
Swiss National Supercomputing Centre
Microsoft
Cray
University of Illinois at Urbana-Champaign
Indiana University
Doctoral advisor Andrew Lumsdaine

Torsten Hoefler is a Professor of Computer Science at ETH Zurich [8] and the Chief Architect for Machine Learning at the Swiss National Supercomputing Centre. [9] Previously, he led the Advanced Application and User Support team at the Blue Waters Directorate of the National Center for Supercomputing Applications, [10] and held an adjunct professor position at the Computer Science Department at the University of Illinois at Urbana Champaign. [11] His expertise lies in large-scale parallel computing and high-performance computing systems. He focuses on applications in large-scale artificial intelligence as well as climate sciences.

Contents

Hoefler is an IEEE Fellow, [12] ACM Fellow, [13] and a member of the European Academy of Sciences Academia Europaea. [14] His Erdos number is two. [15]

He has been invited to present several keynote lectures at major international conferences such as ACM's Federated Computing Research Conference, [16] IEEE Cluster, [17] HPC Asia, Supercomputing Asia, [18] or the International Symposium on Distributed Computing. [19]

Career

Hoefler received his Diplom in Computer Science from TU Chemnitz where he received the best student award in 2005. [20] He worked on high-performance computing systems from the very beginning of his career. He continued his studies at Indiana University, the home of Open MPI, under the guidance of Prof. Andrew Lumsdaine. He received his PhD in Computer Science in 2008 from Indiana University and was subsequently honored with the university's Young Alumni Award [21] as well as Distinguished Alumni Award [22]

He continued his work on the Message Passing Interface standard as a key member of the MPI Forum [23] responsible for the chapters on Collective Communication and Process Topologies as well as co-authoring the chapter on One-Sided Communications. [24]

In 2010, he joined the National Center for Supercomputing Applications at the University of Illinois at Urbana-Champaign (UIUC). As lead for application performance analysis and support, he supported the design and deployment of the Blue Waters Supercomputer. [10] He also held a position as adjunct professor at UIUC's Computer Science department. He accepted a position as assistant professor at ETH Zurich in 2011, [25] where he received tenure in 2017, [26] and is full professor from 2020. [27]

Hoefler has held various visiting researcher positions at French Alternative Energies and Atomic Energy Commission in France, CINECA in Italy, as well as Argonne National Laboratory, Sandia National Laboratory, and Microsoft in the United States. [11] As a consultant, he supported Cray Inc. in the area of high-performance networking and Microsoft Corporation in the areas of quantum computing and large-scale artificial intelligence systems. He spent his sabbatical in 2019 at Microsoft helping to establish various AI supercomputing efforts including the Maia 100 system. [28] [29] [30]

Hoefler has been an elected member of the ACM SIGHPC executive committee since its founding in 2011. [31]

He was elected IEEE Fellow for “contributions to large-scale parallel processing systems and supercomputers”, [12] ACM Fellow for “foundational contributions to High-Performance Computing and the application of HPC techniques to machine learning”, [13] and he received the IEEE Sidney Fernbach Award in 2022 for “application-aware design of HPC algorithms, systems and architectures, and transformative impact on scientific computing and industry”. [3]

Hoefler received the inaugural Jack Dongarra award at ISC High Performance Conference in 2023. [32] [33] [34] He was appointed as a senior fellow of the Abu Dhabi Investment Authority Labs in 2023. [35] [36]

Research impact

Hoefler is known for his contributions to the Message Passing Interface (MPI) standard. He served as author for the chapters “Collective Communication” and “Process Topologies” in MPI-2.2 and the chapters “Collective Communication”, “One-Sided Communications”, and “Process Topologies” in MPI-3 . For the MPI-3 standardization, he chaired the Collective Communications and Topology working groups. [37]

He developed principles for the implementation of nonblocking collective operations and remote memory access that are widely used in MPI implementations such as OpenMPI, MPICH, and derivatives. [38] Nonblocking collective operations such as allreduce, allgather, or broadcast form the basis of modern AI training systems. [39]

After co-authoring a pioneering paper on parallel deep learning [40] and during his sabbatical at Microsoft, he coined the term “3D parallelism” in modern artificial intelligence training that organizes data parallelism, pipeline parallelism, and operator/tensor parallelism into one consistent view. [41]

In his work on high-speed interconnects, he co-developed several award-winning network topologies [41] [42] [43] and contributed routing algorithms that are used in the OpenSM routing manager on InfiniBand computer clusters. [44]

On the application side, Hoefler focuses on improving the performance of climate simulations as a digital twin [45] [46] [47] and machine learning for climate simulations. [48] He has been a convener of the Berlin Summit in Earth Virtualization Engines [49] to develop strategies to enable global access to high-resolution climate simulations. [50] [51]

Scientific reproducibility

Hoefler has been vocal about improving reproducibility of performance measurements in high-performance computing [52] and later machine learning. The latter is featured in IEEE Computer Journal as a cover feature on Research Reproducibility. [53] As Technical Papers chair of ACM/IEEE Supercomputing Conference (SC18), he introduced a new revision-based review process to the conference to improve the quality of the publications. [54] His group received the SIGHPC Certificate of Appreciation for reproducible methods at the ACM/IEEE Supercomputing Conference (SC22) ACM student cluster competition. [55] His paper on HammingMesh received the ACM/IEEE Supercomputing Conference (SC22) Best Reproducibility Advancement Award. [56] [55] He also presented the opening keynote at the first ACM Conference on Reproducibility and Replicability. [57]

Awards and honors

Hoefler and his team received six best (student) paper awards at the ACM/IEEE Supercomputing Conference between 2010 and 2023, [58] [59] [60] [61] the top conference in High-Performance Computing. Additional important awards are listed below.

2024

2023

2022

2021

2020

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2015

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2012

Related Research Articles

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<span class="mw-page-title-main">Jack Dongarra</span> American computer scientist (born 1950)

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<span class="mw-page-title-main">Bill Gropp</span>

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