poster

Extending SYCL host_task for Asynchronous Interop

Authors:

Hugh Delaney,

Nicolas Miller,

Gordon Brown,

Tadej CiglaricAuthors Info & Claims

IWOCL '24: Proceedings of the 12th International Workshop on OpenCL and SYCL

Article No.: 12, Pages 1 - 2

https://doi.org/10.1145/3648115.3648637

Published: 08 April 2024 Publication History

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Abstract

SYCL 2020 provides a host_task feature [1], whereby arbitrary C++ functions can be invoked as a node within the SYCL Directed Acyclic Graph (DAG). This feature is useful for interleaving host code between SYCL kernels and other commands, as well as for interoperability with SYCL backend APIs such as OpenCL or CUDA.

However, the current host_task facility that is provided has some significant limitations for interop work, making it integrate poorly with the asynchrony of the SYCL execution model. These limitations can hinder the performance of SYCL libraries and applications which use host_tasks for interoperability, such as oneMKL or oneDNN.

This article introduces experimental APIs that aim to integrate the asynchrony of the SYCL runtime with the asynchrony of backend APIs such as CUDA, HIP or OpenCL. Special emphasis will be given to the new synchronization behaviour of the SYCL runtime that results from these extensions.

Preliminary performance results are presented, showing that host_task interop using the experimental APIs introduced can give a significant speedup over host_task interop which only relies on core SYCL 2020 features.

References

[1]

[1] The Khronos SYCL Working Group, (2023) SYCL 2020 Specification (revision 8), https://registry.khronos.org/SYCL/specs/sycl-2020/html/sycl-2020.html

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[2]

[2] AdaptiveCpp, Enqueue Custom Operation Extension Document, https://github.com/AdaptiveCpp/AdaptiveCpp/blob/develop/doc/enqueue-custom-operation.md

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[3]

[3] Hugh Delaney, Draft host_task Extension, https://github.com/intel/llvm/pull/12921

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IWOCL '24: Proceedings of the 12th International Workshop on OpenCL and SYCL

April 2024

124 pages

ISBN:9798400717901

DOI:10.1145/3648115

Permission to make digital or hard copies of part or all of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for third-party components of this work must be honored. For all other uses, contact the Owner/Author.

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Association for Computing Machinery

New York, NY, United States

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Published: 08 April 2024

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IWOCL '24

IWOCL '24: International Workshop on OpenCL and SYCL

April 8 - 11, 2024

IL, Chicago, USA

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AdaptiveCpp Stdpar: C++ Standard Parallelism Integrated Into a SYCL Compiler

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