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An Archive of Our Own, a project of the Organization for Transformative Works
Shatter Your Crown in the Lake
Dirk ==> reunite with your Bro and one of your splinters
The kids win the game and get put back on Earth on April 13, 2012. Their guardians are alive and well, and they get to live out the rest of their lives together. Except they're all traumatised and most of them have never actually been part of regular society, so there's some adjusting to work on.
Have people seen Thomas in this video yet?! Because hot damn him and his facial hair 😍
What is SPIR-V? How SYCL Expands C++ Virtual Functions
Discover SPIR-V and how it lets SYCL support heterogeneous C++ virtual functions. This post covers two notions that take SYCL in different directions.
At the 13th IWOCL International Workshop on OpenCL and SYCL, Intel's Alexey Sachiko presented several experimental ideas to expand SYCL's use and scope as a cross-architecture framework for accelerated computing from edge to cloud and AI PC to supercomputer.
Virtual functions are discussed first. SYCL aims to make C++ to multiarchitecture computing a smooth transition. Virtual functions can be redefined in derived classes to offload kernels, so expanding them is consistent.
The second concept is abstraction, although not of base class functions. Increased SPIR-V backend abstraction support will help SYCL's low-level implementation interface with the wide range of hardware architectures and custom accelerators available. The purpose is to improve SYCL LLVM-SPIR-V collaboration.
In many ways, SYCL is becoming more general. SYCL abstraction, from low-level hardware abstraction to C++ virtual function objects, will be discussed as its development continues.
SYCL Virtual Functions
Virtual functions have been used in C++ program development since its inception. Popular backend abstractions like the Kokkos C++ performance portability interface, used in high-speed scientific computing, require it.
Even though the SYCL standard allows one-definition rule (ODR) virtual inheritance, device functions cannot invoke virtual member functions, making code migration difficult.
Alexey begins his talk with a simple base class with a few virtual methods, direct classes with overrides, and offload kernels.
Easy oneAPI kernel property addition for virtual class inheritance.
The experimental indirectly callable function properties from the sycl_ext_oneapi_kernel_properties GitHub sandbox are included first. A function or offload kernel can be identified as a device function and invoked indirectly.
Why do virtual functions need this?
Program objects have virtual class overrides tables. For each virtual function call, a pointer from this table is loaded to call the relevant derived function.
In the Base function, SYCL device code limitations are violated when foo throws an exception and allocates memory.
The indirectly_callable feature makes the virtual function a device function with all its limitations, like the SYCL_EXTERNAL macro.
For the same reason, assume_indirect_calls properties_tag is needed. Kernel virtual calls without this property fail.
Alexey then discusses more advanced topics and future projects like optional kernel feature support and reqd_sub_group_size.
Considering Implementation
When designing an app with this new functionality, consider these high-level factors:
SYCL applications with virtual function support should separate each virtual function set into a device image. If you use optional kernel features, duplicate with empty functions. This provides all link stage symbols without speculative compilation.
For kernel-equipped device images, connect all images with the same virtual function sets.
When targeting SPIR-V, this happens runtime. Otherwise, it happens during build link.
See the for more on technology implementation.
Ext_intel_virtual_functions is in Intel's LLVM GitHub.
Test cases for sycl_ext_oneapi_virtual_functions extension in the same source code tree.
Improve SYCL Code using Virtual Functions
Recent versions of the Intel DPC++ Compatibility Tool 2025.1 and the Intel oneAPI DPC++/C++ Compiler include experimental and evolving virtual function functionality.
SPIR-V Backend SYCL Application
SPIR-V, a binary intermediate language for compute kernels and graphical-shader stages, was specified by the Khronos Group, which regulates SYCL. Its portable format unifies intermediate representation and programming interface for heterogeneous accelerators.
A varied language and API environment supports it
This creates a duality of intermediate abstracted hardware backend representation for C++ compilers based on LLVM and LLVM Intermediate Representation, as with all CLANG project compilers.
The SPIR-V to LLVM Translator provides bidirectional translation, however it is not updated as part of the LLVM project tree, making it prone to rare incompatibilities and disconnects.
To remedy this, Intel's compiler development team recommends SPIR-V as a normal LLVM code generation target, like other hardware target runtimes. Thus, the LLVM project includes an SPIR-V backend to ensure thorough integration testing and allow it to be used with OpenAI Triton backends, graphics-oriented programming models like Vulkan or HLSL, and heterogeneous computing with OpenCL or SYCL.
With extensive documentation, an active and growing LLVM SPIR-V working group supports and maintains the Backend:
SPIR-V Target User Guide
Clang SPIR-V Support
Intel compiler developers help resolve LLVM IR semantics and specifications to SPIR-V mapping difficulties as part of Intel's commitment to the open source community.
In his presentation, Alexey Sachkov details them and Intel's solution.
Is Spir-V?
SPIR-V, a high-level binary intermediate language, defines compute kernels and graphics shaders. It was created by Khronos Group, an OpenGL, Vulkan, and OpenCL organisation.
What that means and why it matters:
IR: GPU assembly language universal. Developers utilise GLSL or HLSL instead of writing shader code for each GPU architecture, which is complicated. Compilers create SPIR-V from this source code.
SPIR-V comes as compiled binary, not source code. This has numerous benefits:
Application startup and shader loading are faster when drivers don't parse and compile text-based shader code.
IP Protection: Shader source code is hidden, making algorithm reverse-engineering harder.
Closer Hardware: SPIR-V's lower-level representation allows more direct control and performance adjustment than high-level languages.
Standard and Portable: Before SPIR-V, each graphics API (like OpenGL or DirectX) handled shaders differently, requiring several compilers and duplication. SPIR-V is a royalty-free, open standard for graphics and computing APIs.
New, low-overhead graphics API Vulkan leverages SPIR-V shaders.
Although optional, OpenGL 4.6 and later support SPIR-V.
OpenCL: GPU/processor parallelism.
In Shader Model 7.0, Microsoft aims to replace DXIL with SPIR-V for Direct3D interoperability. Important for graphics ecosystem unity.
SYCL Code Compilation Target: SPIR-V
The SPIR-V Backend for LLVM is still being developed, however it has been a project target since January 2025. Try it and comment on the LLVM project RFC page.
Use SPIR-V, oneAPI, and SYCL Now
To learn about these and other new features in LLVM-based C++ compilers and toolchains with SYCL support, see the Intel oneAPI DPC++ C++ Compiler and oneAPI Overview landing page.
Intel oneDPL(oneAPI DPC++ Library) Offloads C++ To SYCL
Standard Parallel C++ Code Offload to SYCL Device Utilizing the Intel oneDPL (oneAPI DPC++ Library).
Enhance C++ Parallel STL methods with multi-platform parallel computing capabilities. C++ algorithms may be executed in parallel and vectorized with to the Parallel Standard Template Library, sometimes known as Parallel STL or pSTL.
Utilizing the cross-platform parallelism capabilities of SYCL and the computational power of heterogeneous architectures, you may improve application performance by offloading Parallel STL algorithms to several devices (CPUs or GPUs) that support the SYCL programming framework. Multiarchitecture, accelerated parallel programming across heterogeneous hardware is made possible by the Intel oneAPI DPC++ Library (oneDPL), which allows you to offload Parallel STL code to SYCL devices.
The code example in this article will show how to offload C++ Parallel STL code to a SYCL device using the oneDPL pSTL_offload preview function.
Parallel API
As outlined in ISO/IEC 14882:2017 (often referred to as C++17) and C++20, the Parallel API in Intel oneAPI DPC++ Library (oneDPL) implements the C++ standard algorithms with execution rules. It provides data parallel execution on accelerators supported by SYCL in the Intel oneAPI DPC++/C++ Compiler, as well as threaded and SIMD execution of these algorithms on Intel processors built on top of OpenMP and oneTBB.
The Parallel API offers comparable parallel range algorithms that follow an execution strategy, extending the capabilities of range algorithms in C++20.
Furthermore, oneDPL offers particular iterations of a few algorithms, such as:
Segmented reduction
A segmented scan
Algorithms for vectorized searches
Key-value pair sorting
Conditional transformation
Iterators and function object classes are part of the utility API. The iterators feature a counting and discard iterator, perform permutation operations on other iterators, zip, and transform. The function object classes provide identity, minimum, and maximum operations that may be supplied to reduction or transform algorithms.
An experimental implementation of asynchronous algorithms is also included in oneDPL.
Intel oneAPI DPC++ Library (oneDPL): An Overview
When used with the Intel oneAPI DPC++/C++ Compiler, oneDPL speeds up SYCL kernels for accelerated parallel programming on a variety of hardware accelerators and architectures. With the help of its Parallel API, which offers range-based algorithms, execution rules, and parallel extensions of C++ STL algorithms, C++ STL-styled programs may be efficiently executed in parallel on multi-core CPUs and offloaded to GPUs.
It supports libraries for parallel computing that developers are acquainted with, such Boost and Parallel STL. Compute. Its SYCL-specific API aids in GPU acceleration of SYCL kernels. In contrast, you may use oneDPL‘s Device Selection API to dynamically assign available computing resources to your workload in accordance with pre-established device execution rules.
For simple, automatic CUDA to SYCL code conversion for multiarchitecture programming free from vendor lock-in, the library easily interfaces with the Intel DPC++ Compatibility Tool and its open equivalent, SYCLomatic.
About the Code Sample
With just few code modifications, the pSTL offload code example demonstrates how to offload common C++ parallel algorithms to SYCL devices (CPUs and GPUs). Using the fsycl-pstl-offload option with the Intel oneAPI DPC++/C++ Compiler, it exploits an experimental oneDPL capability.
To perform data parallel computations on heterogeneous devices, the oneDPL Parallel API offers the following execution policies:
Unseq for sequential performance
Par stands for parallel processing.
Combining the effects of par and unseq policies, par_unseq
The following three programs/sub-samples make up the code sample:
FileWordCount uses C++17 parallel techniques to count the words in a file.
WordCount determines how many words are produced using C++17 parallel methods), and
Various STL algorithms with the aforementioned execution policies (unseq, par, and par_unseq) are implemented by ParSTLTests.
The code example shows how to use the –fsycl-pstl-offload compiler option and standard header inclusion in the existing code to automatically offload STL algorithms called by the std:execution::par_unseq policy to a selected SYCL device.
You may offload your SYCL or OpenMP code to a specialized computing resource or an accelerator (such CPU, GPU, or FPGA) by using specific device selection environment variables offered by the oneAPI programming paradigm. One such environment option is ONEAPI_DEVICE_SELECTOR, which restricts the selection of devices from among all the compute resources that may be used to run the code in applications that are based on SYCL and OpenMP. Additionally, the variable enables the selection of sub-devices as separate execution devices.
The code example demonstrates how to use the ONEAPI_DEVICE SELECTOR variable to offload the code to a selected target device. OneDPL is then used to implement the offloaded code. The code is offloaded to the SYCL device by default if the pSTL offload compiler option is not used.
The example shows how to offload STL code to an Intel Xeon CPU and an Intel Data Center GPU Max. However, offloading C++ STL code to any SYCL device may be done in the same way.
What Comes Next?
To speed up SYCL kernels on the newest CPUs, GPUs, and other accelerators, get started with oneDPL and examine oneDPL code examples right now!
For accelerated, multiarchitecture, high-performance parallel computing, it also urge you to investigate other AI and HPC technologies that are based on the unified oneAPI programming paradigm.
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SYCL 2020’s Five New Features For Modern C++ Programmers
SYCL
For accelerator-using C++ programmers, SYCL 2020 is interesting. People enjoyed contributing to the SYCL standard, a book, and the DPC++ open source effort to integrate SYCL into LLVM. The SYCL 2020 standard included some of the favorite new features. These are Intel engineers’ views, not Khronos’.
Khronos allows heterogeneous C++ programming with SYCL. After SYCL 2020 was finalized in late 2020, compiler support increased.
SYCL is argued in several places, including Considering a Heterogeneous Future for C++ and other materials on sycl.tech. How will can allow heterogeneous C++ programming with portability across vendors and architectures? SYCL answers that question.
SYCL 2020 offers interesting new capabilities to be firmly multivendor and multiarchitecture with to community involvement.
The Best Five
A fundamental purpose of SYCL 2020 is to harmonize with ISO C++, which offers two advantages. First, it makes SYCL natural for C++ programmers. Second, it lets SYCL test multivendor, multiarchitecture heterogeneous programming solutions that may influence other C++ libraries and ISO C++.
Changing the base language from C++11 to C++17 allows developers to use class template argument deduction (CTAD) and deduction guides, which necessitated several syntactic changes in SYCL 2020.
Backends allow SYCL to target more hardware by supporting languages/frameworks other than OpenCL.
USM is a pointer-based alternative to SYCL 1.2.1’s buffer/accessor concept.
A “built-in” library in SYCL 2020 accelerates reductions, a frequent programming style.
The group library abstracts cooperative work items, improving application speed and programmer efficiency by aligning with hardware capabilities (independent of vendor).
Atomic references aligned with C++20 std::atomic_ref expand heterogeneous device memory models.
These enhancements make the SYCL ecosystem open, multivendor, and multiarchitecture, allowing C++ writers to fully leverage heterogeneous computing today and in the future.
Backends
With backends, SYCL 2020 allows implementations in languages/frameworks other than OpenCL. Thus, the namespace has been reduced to sycl::, and the SYCL header file has been relocated from to .
These modifications affect SYCL deeply. Although implementations are still free to build atop OpenCL (and many do), generic backends have made SYCL a programming approach that can target more diverse APIs and hardware. SYCL can now “glue” C++ programs to vendor-specific libraries, enabling developers to target several platforms without changing their code.
SYCL 2020 has true openness, cross-architecture, and cross-vendor.
This flexibility allows the open-source DPC++ compiler effort to support NVIDIA, AMD, and Intel GPUs by implementing SYCL 2020 in LLVM (clang). SYCL 2020 has true openness, cross-architecture, and cross-vendor.
Unified shared memory
Some devices provide CPU-host memory unified views. This unified shared memory (USM) from SYCL 2020 allows a pointer-based access paradigm instead of the buffer/accessor model from SYCL 1.2.1.
Programming with USM provides two benefits. First, USM provides a single address space across host and device; pointers to USM allocations are consistent and may be provided to kernels as arguments. Porting pointer-based C++ and CUDA programs to SYCL is substantially simplified. Second, USM allows shared allocations to migrate seamlessly between devices, enhancing programmer efficiency and compatibility with C++ containers (e.g., std::vector) and algorithms.
Three USM allocations provide programmers as much or as little data movement control as they want. Device allocations allow programmers full control over application data migration. Host allocations are beneficial when data is seldom utilized and transporting it is not worth the expense or when data exceeds device capacity. Shared allocations are a good compromise that immediately migrate to use, improving performance and efficiency.
Reductions
Other C++ reduction solutions, such as P0075 and the Kokkos and RAJA libraries, influenced SYCL 2020.
The reducer class and reduction function simplify SYCL kernel variable expression using reduction semantics. It also lets implementations use compile-time reduction method specialization for good performance on various manufacturers’ devices.
The famous BabelStream benchmark, published by the University of Bristol, shows how SYCL 2020 reductions increase performance. BabelStream’s basic dot product kernel computes a floating-point total of all kernel work items. The 43-line SYCL 1.2.1 version employs a tree reduction in work-group local memory and asks the user to choose the optimal device work-group size. SYCL 2020 is shorter (20 lines) and more performance portable by leaving algorithm and work-group size to implementation.
Group Library
The work-group abstraction from SYCL 1.2.1 is expanded by a sub-group abstraction and a library of group-based algorithms in SYCL 2020.
Sub_group describes a kernel’s cooperative work pieces running “together,” providing a portable abstraction for various hardware providers. Sub-groups in the DPC++ compiler always map to a key hardware concept SIMD vectorization on Intel architectures, “warps” on NVIDIA architectures, and “wavefronts” on AMD architectures enabling low-level performance optimization for SYCL applications.
In another tight agreement with ISO C++, SYCL 2020 includes group-based algorithms based on C++17: all_of, any_of, none_of, reduce, exclusive_scan, and inclusive_scan. SYCL implementations may use work-group and/or sub-group parallelism to produce finely tailored, cooperative versions of these functions since each algorithm is supported at various scopes.
Atomic references
Atomics improved in C++20 with the ability to encapsulate types in atomic references (std::atomic_ref). This design (sycl::atomic_ref) is extended to enable address spaces and memory scopes in SYCL 2020, creating an atomic reference implementation ready for heterogeneous computing.
SYCL follows ISO C++, and memory scopes were necessary for portable programming without losing speed. Don’t disregard heterogeneous systems’ complicated memory topologies.
Memory models and atomics are complicated, hence SYCL does not need all devices to use the entire C++ memory model to support as many devices as feasible. SYCL offers a wide range of device capabilities, another example of being accessible to all vendors.
Beyond SYCL 2020: Vendor Extensions
SYCL 2020’s capability for multiple backends and hardware has spurred vendor extensions. These extensions allow innovation that provides practical solutions for devices that require it and guides future SYCL standards. Extensions are crucial to standardization, and the DPC++ compiler project’s extensions inspired various elements in this article.
Two new DPC++ compiler features are SYCL 2020 vendor extensions.
Group-local Memory at Kernel Scope
Local accessors in SYCL 1.2.1 allow for group-local memory, which must be specified outside of the kernel and sent as a kernel parameter. This might seem weird for programmers from OpenCL or CUDA, thus has created an extension to specify group-local memory in a kernel function. This improvement makes kernels more self-contained and informs compiler optimizations (where local memory is known at compile-time).
FPGA-Specific Extensions
The DPC++ compiler project supports Intel FPGAs. It seems that the modifications, or something similar, can work with any FPGA suppliers. FPGAs are a significant accelerator sector, and nous believe it pioneering work will shape future SYCL standards along with other vendor extension initiatives.
Have introduced FPGA choices to make buying FPGA hardware or emulation devices easier. The latter allows quick prototyping, which FPGA software writers must consider. FPGA LSU controls allow us to tune load/store operations and request a specific global memory access configuration. Also implemented data placement controls for external memory banks (e.g., DDR channel) to tune FPGA designs via FPGA memory channel. FPGA registers allow major tuning controls for FPGA high-performance pipelining.
Summary
Heterogeneity endures. Many new hardware alternatives focus on performance and performance-per-watt. This trend will need open, multivendor, multiarchitecture programming paradigms like SYCL.
The five new SYCL 2020 features assist provide portability and performance mobility. C++ programmers may maximize heterogeneous computing with SYCL 2020.
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If I had a nickel for every C/C++ compiler with an abbreviated name that used to stand for something, but was later retconned to mean something else (or just nothing at all), I would have... at least 3 nickels? possibly more? why do they keep doing that? is there even a name for this phenomenon?
OneAPI Construction Kit For Intel RISC V Processor Interface
With the oneAPI Construction Kit, you may integrate the oneAPI Ecosystem into your Intel RISC V Processor.
Intel RISC-V
Recently, Codeplay, an Intel business, revealed that their oneAPI Construction Kit supports RISC-V. Rapidly expanding, Intel RISC V is an open standard instruction set architecture (ISA) available under royalty-free open-source licenses for processors of all kinds.
Through direct programming in C++ with SYCL, along with a set of libraries aimed at common functions like math, threading, and neural networks, and a hardware abstraction layer that allows programming in one language to target different devices, the oneAPI programming model enables a single codebase to be deployed across multiple computing architectures including CPUs, GPUs, FPGAs, and other accelerators.
In order to promote open source cooperation and the creation of a cohesive, cross-architecture programming paradigm free from proprietary software lock-in, the oneAPI standard is now overseen by the UXL Foundation.
A framework that may be used to expand the oneAPI ecosystem to bespoke AI and HPC architectures is Codeplay’s oneAPI Construction Kit. For both native on-host and cross-compilation, the most recent 4.0 version brings RISC-V native host for the first time.
Because of this capability, programs may be executed on a CPU and benefit from the acceleration that SYCL offers via data parallelism. With the oneAPI Construction Kit, Intel RISC V processor designers can now effortlessly connect SYCL and the oneAPI ecosystem with their hardware, marking a key step toward realizing the goal of a completely open hardware and software stack. It is completely free to use and open-source.
OneAPI Construction Kit
Your processor has access to an open environment with the oneAPI Construction Kit. It is a framework that opens up SYCL and other open standards to hardware platforms, and it can be used to expand the oneAPI ecosystem to include unique AI and HPC architectures.
Give Developers Access to a Dynamic, Open-Ecosystem
With the oneAPI Construction Kit, new and customized accelerators may benefit from the oneAPI ecosystem and an abundance of SYCL libraries. Contributors from many sectors of the industry support and maintain this open environment, so you may build with the knowledge that features and libraries will be preserved. Additionally, it frees up developers’ time to innovate more quickly by reducing the amount of time spent rewriting code and managing disparate codebases.
The oneAPI Construction Kit is useful for anybody who designs hardware. To get you started, the Kit includes a reference implementation for Intel RISC V vector processors, although it is not confined to RISC-V and may be modified for a variety of processors.
Codeplay Enhances the oneAPI Construction Kit with RISC-V Support
The rapidly expanding open standard instruction set architecture (ISA) known as RISC-V is compatible with all sorts of processors, including accelerators and CPUs. Axelera, Codasip, and others make Intel RISC V processors for a variety of applications. RISC-V-powered microprocessors are also being developed by the EU as part of the European Processor Initiative.
At Codeplay, has been long been pioneers in open ecosystems, and as a part of RISC-V International, its’ve worked on the project for a number of years, leading working groups that have helped to shape the standard. Nous realize that building a genuinely open environment starts with open, standards-based hardware. But in order to do that, must also need open hardware, open software, and open source from top to bottom.
This is where oneAPI and SYCL come in, offering an ecosystem of open-source, standards-based software libraries for applications of various kinds, such oneMKL or oneDNN, combined with a well-developed programming architecture. Both SYCL and oneAPI are heterogeneous, which means that you may create code once and use it on any GPU AMD, Intel, NVIDIA, or, as of late, RISC-V without being restricted by the manufacturer.
Intel initially implemented RISC-V native host for both native on-host and cross-compilation with the most recent 4.0 version of the oneAPI Construction Kit. Because of this capability, programs may be executed on a CPU and benefit from the acceleration that SYCL offers via data parallelism. With the oneAPI Construction Kit, Intel RISC V processor designers can now effortlessly connect SYCL and the oneAPI ecosystem with their hardware, marking a major step toward realizing the vision of a completely open hardware and software stack.
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SynxFlow Project: A Smooth Migration From CUDA To SYCL
The SynxFlow Project
SynxFlow, an open-source GPU-based hydrodynamic flood modeling software, in CUDA, C++, and Python Data pre-processing and visualization are done in Python while simulations are executed on CUDA. SynxFlow can simulate floods quicker than real-time with hundreds of millions of computational cells and metre-level precision on many GPUs. An open-source software with a simple Python interface, it may be linked into data science workflows for disaster risk assessments. The model has been widely utilized in research and industry, such as to assist flood early warning systems and generate flood maps for (re)insurance firms.
SynxFlow can simulate flooding, landslide runout, and debris flow. Simulations are crucial to emergency service planning and management. A comprehensive prediction of natural disasters can reduce their social and economic costs. In addition to risk assessment and disaster preparedness, SynxFlow flood simulation can help with urban planning, environmental protection, climate change adaptation, insurance and financial planning, infrastructure design and engineering, public awareness, and education.
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Issue Statement
Several variables make probabilistic flood forecasting computationally difficult:
Large dataset storage, retrieval, and management
Complex real-time data processing requires high-performance computation.
Model calibration and validation needed as real-world conditions change.
Effective integration and data transfer between hydrological, hydraulic, and meteorological models, and more.
For speedier results, a flood forecasting system must process data in parallel and offload compute-intensive operations to hardware accelerators. Thus, the SynxFlow team must use larger supercomputers to increase flood simulation scale and cut simulation time. DAWN, the UK’s newest supercomputer, employs Intel GPUs, which SynxFlow didn’t support.
These issues offered researchers a new goal to make the SynxFlow model performance-portable and scalable on supercomputers with multi-vendor GPUs. They must transition SynxFlow code from CUDA to a cross-vendor programming language in weeks, not years.
Solution Powered by oneAPI
After considering several possibilities, the SynxFlow project team chose the Intel oneAPI Base Toolkit implementation of the Unified Acceleration Foundation-backed oneAPI protocol. All are built on multiarchitecture, multi-vendor SYCL framework. It supports Intel, NVIDIA, and AMD GPUs and includes the Intel DPC++ Compatibility Tool for automated CUDA-to-SYCL code translation.
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SynxFlow code migration went smoothly. This produced code that automatically translated most CUDA kernels and API calls into SYCL. After auto-translation, some mistakes were found during compilation, but the migration tool’s error-diagnostic indications and warnings made them easy to rectify. It took longer to switch from NVIDIA Collective Communications Library (NCCL)-based inter-GPU communication to GPU-direct enabled Intel MPI library calls because this could not be automated.
To summarize, there has been a promising attempt to transfer a complicated flood simulation code that was built on CUDA to SYCL, achieving both scalability and performance-portability. The conversion has been easy to handle and seamless thanks to the Intel oneAPI Base Toolkit.
Intel hosted a oneAPI Hackfest at the DiRAC HPC Research Facility
DiRAC
The High Performance Super Computer facility in the United Kingdom serving the theoretical communities of Particle Physics, Astrophysics, Cosmology, Solar System and Planetary Science, and Nuclear Physics.
DiRAC’s three HPC services Extreme Scaling, Memory-Intensive, and Data-Intensive are each designed to support the distinct kinds of computational workflows required to carry out their science program. DiRAC places a strong emphasis on innovation, and all of its services are co-designed with vendor partners, technical and software engineering teams, and research community.
Training Series on oneAPI at DiRAC Hackfest
On May 21–23, 2024, the DiRAC community hosted three half-day remote training sessions on the Intel oneAPI Base Toolkit. The training series was designed for developers and/or researchers with varying degrees of experience, ranging from novices to experts.
The cross-platform compatible SYCL programming framework served as the foundation for a variety of concepts that were taught to the attendees. The students were also introduced to a number of Base Kit component tools and libraries that facilitate SYCL. For instance, the Intel DPC++ Compatibility Tool facilitates automated code migration from CUDA to C++ with SYCL; the Intel oneAPI Math Kernel Library (oneMKL) optimizes math operations; the Intel oneAPI Deep Neural Networks (oneDNN) accelerates hackfest and the Intel oneAPI DPC++ Library (oneDPL) expedites SYCL kernels on a variety of hardware. Additionally, the training sessions covered code profiling and the use of Intel Advisor and Intel VTune Profiler, two tools included in the Base Kit for analyzing performance bottlenecks.
DiRAC Hackfest’s oneAPI Hackath on
In order to complete a range of tasks, including parallelizing Fortran code on Intel GPUs, accelerating math operations like the Fast Fourier Transform (FFT) using oneMKL’s SYCL API, and resolving performance bottlenecks with the aid of Intel Advisor and Intel VTune Profiler, the participants improvised their cutting-edge projects using oneAPI tools and libraries.
The participants reported that it was easy to adjust to using oneAPI components and that the code migration process went smoothly. The teams saw a noticeable increase in workload performance with libraries like Intel MPI. Approximately 70% of the teams who took part indicated that they would be open to using oneAPI technologies to further optimize the code for their research projects. Thirty percent of the teams benchmarked their outcomes using SYCL and oneAPI, and they achieved a 100% success rate in code conversion to SYCL.
Start Programming Multiarchitecture Using SYCL and oneAPI
Investigate the SYCL framework and oneAPI toolkits now for multiarchitecture development that is accelerated! Use oneAPI to enable cross-platform parallelism in your apps and move your workloads to SYCL for high-performance heterogeneous computing.
Intel invite you to review the real-world code migration application samples found in the CUDA to SYCL catalog. Investigate the AI, HPC, and rendering solutions available in Intel’s software portfolio driven by oneAPI.
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