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SYCL Command Graph Extensions

This fork is mostly stale since the main development has been moved to the Intel staging area for llvm.org contributions.

This fork has been the collaboration space for the oneAPI vendor Command Graph extension for SYCL2020 until September 2023. SYCL Graph provides an API for defining a graph of operations and their dependencies once and submitting this graph repeatedly for execution.

A draft of our Command Graph extension proposal can be found here: sycl_ext_oneapi_graph.

Our implementation can be found here: https://github.com/intel/llvm.

An application can query the SYCL library for the level of support it provides for using the extension with a device by using ext::oneapi::experimental::info::device::graph_support, which returns one of:

Native - Backend command-buffer construct is used to implement graphs.
Emulated - Graphs support is emulated by reissuing commands to the backend.
Unsupported - Extension is not supported on the device.

Currently the Level Zero backend is the only supported SYCL backend for the sycl_ext_oneapi_graph extension. As the focus of the current prototype is good Level Zero support to prove the value of the extension, rather than emulated support for many backends. However, broadening the number of backends supported is something we are interested in expanding on.

Backend Implementation Support Level Zero Native using command-lists CUDA Native support is a work-in-progress OpenCL Unsupported HIP Unsupported Others Unsupported Feature Implementation Status (- error type) Adding a command-group node with command_graph::add() Implemented Begin & end queue recording to a graph to create nodes Implemented Edges created from buffer accessor dependencies Implemented Edges created from handler::depends_on dependencies Implemented Edges created using make_edge() Implemented Edges created by passing a property list to command_graph::add() Implemented Empty node Implemented Queue ext_oneapi_get_state() query Implemented Vendor test macro Implemented Ability to add a graph as a node of another graph (Sub-graphs) Implemented Using all capabilities of USM in a graph node Implemented Extending lifetime of buffers used in a graph, as defined by the "Storage Lifetimes" specification section Not implemented - Throws an exception that feature is not supported yet Buffer taking a copy of underlying host data when buffer is used in a graph, as defined by the "Storage Lifetimes" specification section Not implemented - Throws an exception that feature is not supported yet Executable graph update() Not implemented - Exception "Method not yet implemented" Recording an in-order queue preserves linear dependencies Implemented Using handler::parallel_for in a graph node Implemented Using handler::single_task in a graph node Implemented Using handler::memcpy in a graph node Implemented Using handler::copy in a graph node Implemented Using handler::host_task in a graph node Not implemented - Assert: "getCGCopy() const: Assertion `false' failed." Using handler::fill in a graph node Implemented for USM, not implemented for buffer accessors - Exception: "CG type not implemented for command buffers" Using handler::memset in a graph node Not implemented - Exception: "CG type not implemented for command buffers" Using handler::prefetch in a graph node Not implemented - Exception: "CG type not implemented for command buffers" Using handler::memadvise in a graph node Not implemented - Exception: "CG type not implemented for command buffers" Using specialization constants in a graph node Not implemented - Throws an exception that feature is not supported yet Using reductions in a graph node Not implemented - Throws an exception that feature is not supported yet Using kernel bundles in a graph node Not implemented - Throws an exception that feature is not supported yet Using sycl streams in a graph node Not implemented - Exception: "Failed to add kernel to PI command-buffer" Thread safety of new methods Implemented Profiling an event returned from graph submission with event::get_profiling_info() Not implemented - Throws an exception that feature is not supported yet Querying the state of an event returned from graph submission with event::get_info<info::event::command_execution_status>() Implemented

This extension was presented at the oneAPI Technical Advisory board (Sept'22 meeting). Slides: https://github.com/oneapi-src/oneAPI-tab/blob/main/language/presentations/2022-09-28-TAB-SYCL-Graph.pdf.

Extension was presented at IWOCL 2023, and the talk can be found on Youtube.

Intel Project for LLVM* technology

We target a contribution through the origin of this fork: Intel staging area for llvm.org contributions.

TDB

See Get Started Guide.

Submit an issue or initiate a discussion.

How to contribute to DPC++

This project welcomes contributions from the community. Please refer to CONTRIBUTING for general guidelines around contributing to this project. You can then see ContributeToDPCPP for DPC++ specific guidelines.

See LICENSE for details.

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