SYCL IS MAINSTREAM Open Standards and Open Source implementations, community driven Open cross-company collaboration Co-design for all forms of extreme heterogeneity Open Source without a community 2 2017 2020 202X SYCL 1.2 C++11 Single source programming SYCL 1.2.1 C++11 Single source programming SYCL 2020 C++17 Single source programming Many backend options SYCL 202X C++20 Single source 3.0 C++23SYCL IMPLEMENTATIONS IN DEVELOPMENT Source Code DPC++ Uses LLVM/Clang Part of oneAPI hipSYCL Multiple Backends Any CPU Intel CPUs Intel GPUs Intel FPGAs AMD GPUs Any CPU SYCL enables Khronos

1Michael Wong Distinguished Engineer ● Chair of SYCL Heterogeneous Programming Language ● ISO C++ Directions Group past Chair ● Past CEO OpenMP ● ISOCPP.org Director, VP http://isocpp.org/wiki/ Facility (ALCF) ○ Computer Scientist ○ Kokkos (SYCL/DPC++ backend) ○ Vice Chair WG21 Library Evolution Working Group Incubator (LEWGI / SG18) ○ SYCL Committee Representative ○ oneAPI, oneMKL Technical C++ programming models for heterogeneous systems Worked on ComputeCpp (SYCL) since its inception Contributor to the Khronos SYCL standard for 8 years Contributor to C++ executors and heterogeneity or

for Errors in Safety-Critical SYCL Erik Tomusk CppCon 2023 October 5, 2023© 2023 Codeplay Software Ltd. Codeplay Corporate Slide 2© 2023 Codeplay Software Ltd. • SYCL is an abstraction layer for running safety-critical, not supercomputing • SC is any domain where software can cause substantial harm • More on SYCL in room Cottonwood 2/3: 3© 2023 Codeplay Software Ltd. Disclaimer Slide 4 This is a personal presentation Handling • Case Study • Why is this Important? • Is it Really so bad? • What does this mean for SYCL SC? • What does this mean for you? 5Definition of Safety 6© 2023 Codeplay Software Ltd. Definition

strategies: C-style programming with OpenMP, native mechanisms in modern C++, as well as through Kokkos and Sycl. Discussion An important corner of scientific computing is concerned with sparse matrices, in particular The second extension is Sycl, a Khronos open standard, which can be considered a library built on standard C++, but in practice requires compiler support. The major proponent of Sycl is Intel, which provides work: The ‘AdaptiveCPP’ open source alternative to Sycl is very hard to install. I hope to find time for another attempt. This will allow testing Sycl on two different compilers: Intel with optimized TBB

into WG21 in threading, vectorization and numerics. Contribution into SYCL Michael Wong Distinguished Engineer ● Chair of SYCL Heterogeneous Programming Language ● ISO C++ Directions Group past Chair safety certification Rendering Compute Display • Khronos Safety Critical Advisory Forum • OpenCL/SYCL Safety Critical • Vulkan Safety Critical • JTC1/SC42 Machine Learning WG3 Trustworthiness • ITC22/SC32

seg) { return seg | transform(fun_); }); } private: V base_; F fun_; };SYCL Codebase (shp) - Data automatically distributed amongst multiple GPUs - Distributed algorithms: }); return reduce(par_unseq, z.begin(), z.end(), T(0), std::plus()); }SYCL Codebase (shp) - Data automatically distributed amongst multiple GPUs - Distributed algorithms:

Audience etc.. Ask questions during the talk Audience? Only Cuda What is Cuda Do not ask me about SYCL, ROCm, Vulkan, ... You can tell me about afterwards7/66 Motivation Patterns The dark path Cuda proposal