oneAPI is an

open standard An open standard is a standard that is openly accessible and usable by anyone. It is also a prerequisite to use open license, non-discrimination and extensibility. Typically, anybody can participate in the development. There is no single definitio ...

for a unified application programming interface intended to be used across different compute accelerator ( coprocessor) architectures, including

GPU A graphics processing unit (GPU) is a specialized electronic circuit designed to manipulate and alter memory to accelerate the creation of images in a frame buffer intended for output to a display device. GPUs are used in embedded systems, mob ...

AI accelerator An AI accelerator is a class of specialized hardware accelerator or computer system designed to accelerate artificial intelligence and machine learning applications, including artificial neural networks and machine vision. Typical applications ...

s and

field-programmable gate array A field-programmable gate array (FPGA) is an integrated circuit designed to be configured by a customer or a designer after manufacturinghence the term '' field-programmable''. The FPGA configuration is generally specified using a hardware ...

s. It is intended to eliminate the need for developers to maintain separate code bases, multiple programming languages, and different tools and workflows for each architecture.

The oneAPI specification

The oneAPI specification extends existing developer programming models to enable multiple hardware architectures through a data-parallel language, a set of library APIs, and a low-level hardware interface to support cross-architecture programming. It builds upon industry standards and provides an open, cross-platform developer stack.

Data Parallel C++

DPC++ oneAPI is an open standard for a unified application programming interface intended to be used across different compute accelerator (coprocessor) architectures, including GPUs, AI accelerators and field-programmable gate arrays. It is intended ...

is an open, cross-architecture language built upon the ISO C++ and

Khronos Group The Khronos Group, Inc. is an open, non-profit, member-driven consortium of 170 organizations developing, publishing and maintaining royalty-free interoperability standards for 3D graphics, virtual reality, augmented reality, parallel computat ...

SYCL SYCL is a higher-level programming model to improve programming productivity on various hardware accelerators. It is a single-source embedded domain-specific language (eDSL) based on pure C++17. It is a standard developed by Khronos Group, anno ...

standards. DPC++ is an implementation of SYCL with extensions that are proposed for inclusion in future revisions of the SYCL standard. An example of this is the contribution of unified shared memory, group algorithms and sub-groups to SYCL 2020.

oneAPI libraries

The set of APIs spans several domains that benefit from acceleration, including libraries for linear algebra math, deep learning, machine learning, video processing, and others. The

source code In computing, source code, or simply code, is any collection of code, with or without comment (computer programming), comments, written using a human-readable programming language, usually as plain text. The source code of a Computer program, p ...

of most implementations of the above libraries is available on GitHub. The oneAPI documentation also lists the "Level Zero" API defining the low-level direct-to-metal interfaces and a set or ray tracing components with its own APIs.

Hardware abstraction layer

oneAPI Level Zero, the low-level hardware interface, defines a set of capabilities and services that a hardware accelerator needs to interface with compiler runtimes and other developer tools.

Implementations

Intel Intel Corporation is an American multinational corporation and technology company headquartered in Santa Clara, California, Santa Clara, California. It is the world's largest semiconductor chip manufacturer by revenue, and is one of the devel ...

has released production quality oneAPI toolkits that implement the specification and add CUDA code migration, analysis, and debug tools. These include the Intel oneAPI DPC++/C++ Compiler,

Intel Fortran Compiler Intel Fortran Compiler, is a group of Fortran compilers from Intel for Windows, macOS, and Linux. Overview The compilers generate code for IA-32 and Intel 64 processors and certain non-Intel but compatible processors, such as certain AMD proces ...

, Intel VTune Profiler and multiple performance libraries. Codeplay has released an open-source layer to allow oneAPI and SYCL/DPC++ to run atop

Nvidia Nvidia CorporationOfficially written as NVIDIA and stylized in its logo as VIDIA with the lowercase "n" the same height as the uppercase "VIDIA"; formerly stylized as VIDIA with a large italicized lowercase "n" on products from the mid 1990s to ...

s via

CUDA CUDA (or Compute Unified Device Architecture) is a parallel computing platform and application programming interface (API) that allows software to use certain types of graphics processing units (GPUs) for general purpose processing, an approach ...

. University of Heidelberg has developed a SYCL/DPC++ implementation for both AMD and Nvidia GPUs. Huawei released a DPC++ compiler for their Ascend AI Chipset

Fujitsu is a Japanese multinational information and communications technology equipment and services corporation, established in 1935 and headquartered in Tokyo. Fujitsu is the world's sixth-largest IT services provider by annual revenue, and the la ...

has created an open-source

ARM In human anatomy, the arm refers to the upper limb in common usage, although academically the term specifically means the upper arm between the glenohumeral joint (shoulder joint) and the elbow joint. The distal part of the upper limb between t ...

version of the oneAPI Deep Neural Network Library (oneDNN) for their Fugaku CPU.

References

External links

*
Intel oneAPI Product

Bringing Nvidia GPU support to SYCL developers
* * {{GitHub, oneapi-src, oneapi-src Application programming interfaces Cross-platform software